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179a0cc4 | 1 | // SPDX-License-Identifier: GPL-2.0 |
2541517c | 2 | /* Copyright (c) 2011-2015 PLUMgrid, http://plumgrid.com |
0515e599 | 3 | * Copyright (c) 2016 Facebook |
2541517c AS |
4 | */ |
5 | #include <linux/kernel.h> | |
6 | #include <linux/types.h> | |
7 | #include <linux/slab.h> | |
8 | #include <linux/bpf.h> | |
4279adb0 | 9 | #include <linux/bpf_verifier.h> |
0515e599 | 10 | #include <linux/bpf_perf_event.h> |
c4d0bfb4 | 11 | #include <linux/btf.h> |
2541517c AS |
12 | #include <linux/filter.h> |
13 | #include <linux/uaccess.h> | |
9c959c86 | 14 | #include <linux/ctype.h> |
9802d865 | 15 | #include <linux/kprobes.h> |
ac5a72ea | 16 | #include <linux/spinlock.h> |
41bdc4b4 | 17 | #include <linux/syscalls.h> |
540adea3 | 18 | #include <linux/error-injection.h> |
c9a0f3b8 | 19 | #include <linux/btf_ids.h> |
6f100640 | 20 | #include <linux/bpf_lsm.h> |
0dcac272 | 21 | #include <linux/fprobe.h> |
ca74823c JO |
22 | #include <linux/bsearch.h> |
23 | #include <linux/sort.h> | |
f3cf4134 RS |
24 | #include <linux/key.h> |
25 | #include <linux/verification.h> | |
89ae89f5 | 26 | #include <linux/namei.h> |
6f100640 | 27 | |
8e4597c6 | 28 | #include <net/bpf_sk_storage.h> |
9802d865 | 29 | |
c4d0bfb4 AM |
30 | #include <uapi/linux/bpf.h> |
31 | #include <uapi/linux/btf.h> | |
32 | ||
c7b6f29b NA |
33 | #include <asm/tlb.h> |
34 | ||
9802d865 | 35 | #include "trace_probe.h" |
2541517c AS |
36 | #include "trace.h" |
37 | ||
ac5a72ea AM |
38 | #define CREATE_TRACE_POINTS |
39 | #include "bpf_trace.h" | |
40 | ||
e672db03 SF |
41 | #define bpf_event_rcu_dereference(p) \ |
42 | rcu_dereference_protected(p, lockdep_is_held(&bpf_event_mutex)) | |
43 | ||
8b2efe51 | 44 | #define MAX_UPROBE_MULTI_CNT (1U << 20) |
d6d1e6c1 | 45 | #define MAX_KPROBE_MULTI_CNT (1U << 20) |
8b2efe51 | 46 | |
a38d1107 MM |
47 | #ifdef CONFIG_MODULES |
48 | struct bpf_trace_module { | |
49 | struct module *module; | |
50 | struct list_head list; | |
51 | }; | |
52 | ||
53 | static LIST_HEAD(bpf_trace_modules); | |
54 | static DEFINE_MUTEX(bpf_module_mutex); | |
55 | ||
56 | static struct bpf_raw_event_map *bpf_get_raw_tracepoint_module(const char *name) | |
57 | { | |
58 | struct bpf_raw_event_map *btp, *ret = NULL; | |
59 | struct bpf_trace_module *btm; | |
60 | unsigned int i; | |
61 | ||
62 | mutex_lock(&bpf_module_mutex); | |
63 | list_for_each_entry(btm, &bpf_trace_modules, list) { | |
64 | for (i = 0; i < btm->module->num_bpf_raw_events; ++i) { | |
65 | btp = &btm->module->bpf_raw_events[i]; | |
66 | if (!strcmp(btp->tp->name, name)) { | |
67 | if (try_module_get(btm->module)) | |
68 | ret = btp; | |
69 | goto out; | |
70 | } | |
71 | } | |
72 | } | |
73 | out: | |
74 | mutex_unlock(&bpf_module_mutex); | |
75 | return ret; | |
76 | } | |
77 | #else | |
78 | static struct bpf_raw_event_map *bpf_get_raw_tracepoint_module(const char *name) | |
79 | { | |
80 | return NULL; | |
81 | } | |
82 | #endif /* CONFIG_MODULES */ | |
83 | ||
035226b9 | 84 | u64 bpf_get_stackid(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5); |
c195651e | 85 | u64 bpf_get_stack(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5); |
035226b9 | 86 | |
eb411377 AM |
87 | static int bpf_btf_printf_prepare(struct btf_ptr *ptr, u32 btf_ptr_size, |
88 | u64 flags, const struct btf **btf, | |
89 | s32 *btf_id); | |
f7098690 JO |
90 | static u64 bpf_kprobe_multi_cookie(struct bpf_run_ctx *ctx); |
91 | static u64 bpf_kprobe_multi_entry_ip(struct bpf_run_ctx *ctx); | |
eb411377 | 92 | |
0b779b61 | 93 | static u64 bpf_uprobe_multi_cookie(struct bpf_run_ctx *ctx); |
686328d8 | 94 | static u64 bpf_uprobe_multi_entry_ip(struct bpf_run_ctx *ctx); |
0b779b61 | 95 | |
2541517c AS |
96 | /** |
97 | * trace_call_bpf - invoke BPF program | |
e87c6bc3 | 98 | * @call: tracepoint event |
2541517c AS |
99 | * @ctx: opaque context pointer |
100 | * | |
101 | * kprobe handlers execute BPF programs via this helper. | |
102 | * Can be used from static tracepoints in the future. | |
103 | * | |
104 | * Return: BPF programs always return an integer which is interpreted by | |
105 | * kprobe handler as: | |
106 | * 0 - return from kprobe (event is filtered out) | |
107 | * 1 - store kprobe event into ring buffer | |
108 | * Other values are reserved and currently alias to 1 | |
109 | */ | |
e87c6bc3 | 110 | unsigned int trace_call_bpf(struct trace_event_call *call, void *ctx) |
2541517c AS |
111 | { |
112 | unsigned int ret; | |
113 | ||
b0a81b94 | 114 | cant_sleep(); |
2541517c AS |
115 | |
116 | if (unlikely(__this_cpu_inc_return(bpf_prog_active) != 1)) { | |
117 | /* | |
118 | * since some bpf program is already running on this cpu, | |
119 | * don't call into another bpf program (same or different) | |
120 | * and don't send kprobe event into ring-buffer, | |
121 | * so return zero here | |
122 | */ | |
dd865789 JO |
123 | rcu_read_lock(); |
124 | bpf_prog_inc_misses_counters(rcu_dereference(call->prog_array)); | |
125 | rcu_read_unlock(); | |
2541517c AS |
126 | ret = 0; |
127 | goto out; | |
128 | } | |
129 | ||
e87c6bc3 YS |
130 | /* |
131 | * Instead of moving rcu_read_lock/rcu_dereference/rcu_read_unlock | |
132 | * to all call sites, we did a bpf_prog_array_valid() there to check | |
133 | * whether call->prog_array is empty or not, which is | |
2b5894cc | 134 | * a heuristic to speed up execution. |
e87c6bc3 YS |
135 | * |
136 | * If bpf_prog_array_valid() fetched prog_array was | |
137 | * non-NULL, we go into trace_call_bpf() and do the actual | |
138 | * proper rcu_dereference() under RCU lock. | |
139 | * If it turns out that prog_array is NULL then, we bail out. | |
140 | * For the opposite, if the bpf_prog_array_valid() fetched pointer | |
141 | * was NULL, you'll skip the prog_array with the risk of missing | |
142 | * out of events when it was updated in between this and the | |
143 | * rcu_dereference() which is accepted risk. | |
144 | */ | |
055eb955 SF |
145 | rcu_read_lock(); |
146 | ret = bpf_prog_run_array(rcu_dereference(call->prog_array), | |
147 | ctx, bpf_prog_run); | |
148 | rcu_read_unlock(); | |
2541517c AS |
149 | |
150 | out: | |
151 | __this_cpu_dec(bpf_prog_active); | |
2541517c AS |
152 | |
153 | return ret; | |
154 | } | |
2541517c | 155 | |
9802d865 JB |
156 | #ifdef CONFIG_BPF_KPROBE_OVERRIDE |
157 | BPF_CALL_2(bpf_override_return, struct pt_regs *, regs, unsigned long, rc) | |
158 | { | |
9802d865 | 159 | regs_set_return_value(regs, rc); |
540adea3 | 160 | override_function_with_return(regs); |
9802d865 JB |
161 | return 0; |
162 | } | |
163 | ||
164 | static const struct bpf_func_proto bpf_override_return_proto = { | |
165 | .func = bpf_override_return, | |
166 | .gpl_only = true, | |
167 | .ret_type = RET_INTEGER, | |
168 | .arg1_type = ARG_PTR_TO_CTX, | |
169 | .arg2_type = ARG_ANYTHING, | |
170 | }; | |
171 | #endif | |
172 | ||
8d92db5c CH |
173 | static __always_inline int |
174 | bpf_probe_read_user_common(void *dst, u32 size, const void __user *unsafe_ptr) | |
2541517c | 175 | { |
8d92db5c | 176 | int ret; |
2541517c | 177 | |
c0ee37e8 | 178 | ret = copy_from_user_nofault(dst, unsafe_ptr, size); |
6ae08ae3 DB |
179 | if (unlikely(ret < 0)) |
180 | memset(dst, 0, size); | |
6ae08ae3 DB |
181 | return ret; |
182 | } | |
183 | ||
8d92db5c CH |
184 | BPF_CALL_3(bpf_probe_read_user, void *, dst, u32, size, |
185 | const void __user *, unsafe_ptr) | |
186 | { | |
187 | return bpf_probe_read_user_common(dst, size, unsafe_ptr); | |
188 | } | |
189 | ||
f470378c | 190 | const struct bpf_func_proto bpf_probe_read_user_proto = { |
6ae08ae3 DB |
191 | .func = bpf_probe_read_user, |
192 | .gpl_only = true, | |
193 | .ret_type = RET_INTEGER, | |
194 | .arg1_type = ARG_PTR_TO_UNINIT_MEM, | |
195 | .arg2_type = ARG_CONST_SIZE_OR_ZERO, | |
196 | .arg3_type = ARG_ANYTHING, | |
197 | }; | |
198 | ||
8d92db5c CH |
199 | static __always_inline int |
200 | bpf_probe_read_user_str_common(void *dst, u32 size, | |
201 | const void __user *unsafe_ptr) | |
6ae08ae3 | 202 | { |
8d92db5c | 203 | int ret; |
6ae08ae3 | 204 | |
6fa6d280 DX |
205 | /* |
206 | * NB: We rely on strncpy_from_user() not copying junk past the NUL | |
207 | * terminator into `dst`. | |
208 | * | |
209 | * strncpy_from_user() does long-sized strides in the fast path. If the | |
210 | * strncpy does not mask out the bytes after the NUL in `unsafe_ptr`, | |
211 | * then there could be junk after the NUL in `dst`. If user takes `dst` | |
212 | * and keys a hash map with it, then semantically identical strings can | |
213 | * occupy multiple entries in the map. | |
214 | */ | |
8d92db5c | 215 | ret = strncpy_from_user_nofault(dst, unsafe_ptr, size); |
6ae08ae3 DB |
216 | if (unlikely(ret < 0)) |
217 | memset(dst, 0, size); | |
6ae08ae3 DB |
218 | return ret; |
219 | } | |
220 | ||
8d92db5c CH |
221 | BPF_CALL_3(bpf_probe_read_user_str, void *, dst, u32, size, |
222 | const void __user *, unsafe_ptr) | |
223 | { | |
224 | return bpf_probe_read_user_str_common(dst, size, unsafe_ptr); | |
225 | } | |
226 | ||
f470378c | 227 | const struct bpf_func_proto bpf_probe_read_user_str_proto = { |
6ae08ae3 DB |
228 | .func = bpf_probe_read_user_str, |
229 | .gpl_only = true, | |
230 | .ret_type = RET_INTEGER, | |
231 | .arg1_type = ARG_PTR_TO_UNINIT_MEM, | |
232 | .arg2_type = ARG_CONST_SIZE_OR_ZERO, | |
233 | .arg3_type = ARG_ANYTHING, | |
234 | }; | |
235 | ||
6ae08ae3 DB |
236 | BPF_CALL_3(bpf_probe_read_kernel, void *, dst, u32, size, |
237 | const void *, unsafe_ptr) | |
238 | { | |
8d92db5c | 239 | return bpf_probe_read_kernel_common(dst, size, unsafe_ptr); |
6ae08ae3 DB |
240 | } |
241 | ||
f470378c | 242 | const struct bpf_func_proto bpf_probe_read_kernel_proto = { |
6ae08ae3 DB |
243 | .func = bpf_probe_read_kernel, |
244 | .gpl_only = true, | |
245 | .ret_type = RET_INTEGER, | |
246 | .arg1_type = ARG_PTR_TO_UNINIT_MEM, | |
247 | .arg2_type = ARG_CONST_SIZE_OR_ZERO, | |
248 | .arg3_type = ARG_ANYTHING, | |
249 | }; | |
250 | ||
6ae08ae3 | 251 | static __always_inline int |
8d92db5c | 252 | bpf_probe_read_kernel_str_common(void *dst, u32 size, const void *unsafe_ptr) |
6ae08ae3 | 253 | { |
ff40e510 | 254 | int ret; |
8d92db5c | 255 | |
6ae08ae3 | 256 | /* |
8d92db5c CH |
257 | * The strncpy_from_kernel_nofault() call will likely not fill the |
258 | * entire buffer, but that's okay in this circumstance as we're probing | |
6ae08ae3 DB |
259 | * arbitrary memory anyway similar to bpf_probe_read_*() and might |
260 | * as well probe the stack. Thus, memory is explicitly cleared | |
261 | * only in error case, so that improper users ignoring return | |
262 | * code altogether don't copy garbage; otherwise length of string | |
263 | * is returned that can be used for bpf_perf_event_output() et al. | |
264 | */ | |
8d92db5c | 265 | ret = strncpy_from_kernel_nofault(dst, unsafe_ptr, size); |
6ae08ae3 | 266 | if (unlikely(ret < 0)) |
ff40e510 | 267 | memset(dst, 0, size); |
074f528e | 268 | return ret; |
2541517c AS |
269 | } |
270 | ||
6ae08ae3 DB |
271 | BPF_CALL_3(bpf_probe_read_kernel_str, void *, dst, u32, size, |
272 | const void *, unsafe_ptr) | |
273 | { | |
8d92db5c | 274 | return bpf_probe_read_kernel_str_common(dst, size, unsafe_ptr); |
6ae08ae3 DB |
275 | } |
276 | ||
f470378c | 277 | const struct bpf_func_proto bpf_probe_read_kernel_str_proto = { |
6ae08ae3 DB |
278 | .func = bpf_probe_read_kernel_str, |
279 | .gpl_only = true, | |
280 | .ret_type = RET_INTEGER, | |
281 | .arg1_type = ARG_PTR_TO_UNINIT_MEM, | |
282 | .arg2_type = ARG_CONST_SIZE_OR_ZERO, | |
283 | .arg3_type = ARG_ANYTHING, | |
284 | }; | |
285 | ||
8d92db5c CH |
286 | #ifdef CONFIG_ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE |
287 | BPF_CALL_3(bpf_probe_read_compat, void *, dst, u32, size, | |
288 | const void *, unsafe_ptr) | |
289 | { | |
290 | if ((unsigned long)unsafe_ptr < TASK_SIZE) { | |
291 | return bpf_probe_read_user_common(dst, size, | |
292 | (__force void __user *)unsafe_ptr); | |
293 | } | |
294 | return bpf_probe_read_kernel_common(dst, size, unsafe_ptr); | |
295 | } | |
296 | ||
297 | static const struct bpf_func_proto bpf_probe_read_compat_proto = { | |
298 | .func = bpf_probe_read_compat, | |
299 | .gpl_only = true, | |
300 | .ret_type = RET_INTEGER, | |
301 | .arg1_type = ARG_PTR_TO_UNINIT_MEM, | |
302 | .arg2_type = ARG_CONST_SIZE_OR_ZERO, | |
303 | .arg3_type = ARG_ANYTHING, | |
304 | }; | |
305 | ||
6ae08ae3 DB |
306 | BPF_CALL_3(bpf_probe_read_compat_str, void *, dst, u32, size, |
307 | const void *, unsafe_ptr) | |
308 | { | |
8d92db5c CH |
309 | if ((unsigned long)unsafe_ptr < TASK_SIZE) { |
310 | return bpf_probe_read_user_str_common(dst, size, | |
311 | (__force void __user *)unsafe_ptr); | |
312 | } | |
313 | return bpf_probe_read_kernel_str_common(dst, size, unsafe_ptr); | |
6ae08ae3 DB |
314 | } |
315 | ||
316 | static const struct bpf_func_proto bpf_probe_read_compat_str_proto = { | |
317 | .func = bpf_probe_read_compat_str, | |
2541517c AS |
318 | .gpl_only = true, |
319 | .ret_type = RET_INTEGER, | |
39f19ebb | 320 | .arg1_type = ARG_PTR_TO_UNINIT_MEM, |
9c019e2b | 321 | .arg2_type = ARG_CONST_SIZE_OR_ZERO, |
2541517c AS |
322 | .arg3_type = ARG_ANYTHING, |
323 | }; | |
8d92db5c | 324 | #endif /* CONFIG_ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE */ |
2541517c | 325 | |
eb1b6688 | 326 | BPF_CALL_3(bpf_probe_write_user, void __user *, unsafe_ptr, const void *, src, |
f3694e00 | 327 | u32, size) |
96ae5227 | 328 | { |
96ae5227 SD |
329 | /* |
330 | * Ensure we're in user context which is safe for the helper to | |
331 | * run. This helper has no business in a kthread. | |
332 | * | |
333 | * access_ok() should prevent writing to non-user memory, but in | |
334 | * some situations (nommu, temporary switch, etc) access_ok() does | |
335 | * not provide enough validation, hence the check on KERNEL_DS. | |
c7b6f29b NA |
336 | * |
337 | * nmi_uaccess_okay() ensures the probe is not run in an interim | |
338 | * state, when the task or mm are switched. This is specifically | |
339 | * required to prevent the use of temporary mm. | |
96ae5227 SD |
340 | */ |
341 | ||
342 | if (unlikely(in_interrupt() || | |
343 | current->flags & (PF_KTHREAD | PF_EXITING))) | |
344 | return -EPERM; | |
c7b6f29b NA |
345 | if (unlikely(!nmi_uaccess_okay())) |
346 | return -EPERM; | |
96ae5227 | 347 | |
c0ee37e8 | 348 | return copy_to_user_nofault(unsafe_ptr, src, size); |
96ae5227 SD |
349 | } |
350 | ||
351 | static const struct bpf_func_proto bpf_probe_write_user_proto = { | |
352 | .func = bpf_probe_write_user, | |
353 | .gpl_only = true, | |
354 | .ret_type = RET_INTEGER, | |
355 | .arg1_type = ARG_ANYTHING, | |
216e3cd2 | 356 | .arg2_type = ARG_PTR_TO_MEM | MEM_RDONLY, |
39f19ebb | 357 | .arg3_type = ARG_CONST_SIZE, |
96ae5227 SD |
358 | }; |
359 | ||
d9c9e4db FR |
360 | #define MAX_TRACE_PRINTK_VARARGS 3 |
361 | #define BPF_TRACE_PRINTK_SIZE 1024 | |
ac5a72ea | 362 | |
d9c9e4db FR |
363 | BPF_CALL_5(bpf_trace_printk, char *, fmt, u32, fmt_size, u64, arg1, |
364 | u64, arg2, u64, arg3) | |
ac5a72ea | 365 | { |
d9c9e4db | 366 | u64 args[MAX_TRACE_PRINTK_VARARGS] = { arg1, arg2, arg3 }; |
78aa1cc9 JO |
367 | struct bpf_bprintf_data data = { |
368 | .get_bin_args = true, | |
e2bb9e01 | 369 | .get_buf = true, |
78aa1cc9 | 370 | }; |
ac5a72ea AM |
371 | int ret; |
372 | ||
78aa1cc9 JO |
373 | ret = bpf_bprintf_prepare(fmt, fmt_size, args, |
374 | MAX_TRACE_PRINTK_VARARGS, &data); | |
d9c9e4db FR |
375 | if (ret < 0) |
376 | return ret; | |
377 | ||
e2bb9e01 | 378 | ret = bstr_printf(data.buf, MAX_BPRINTF_BUF, fmt, data.bin_args); |
d9c9e4db | 379 | |
e2bb9e01 | 380 | trace_bpf_trace_printk(data.buf); |
ac5a72ea | 381 | |
f19a4050 | 382 | bpf_bprintf_cleanup(&data); |
9c959c86 | 383 | |
d9c9e4db | 384 | return ret; |
9c959c86 AS |
385 | } |
386 | ||
387 | static const struct bpf_func_proto bpf_trace_printk_proto = { | |
388 | .func = bpf_trace_printk, | |
389 | .gpl_only = true, | |
390 | .ret_type = RET_INTEGER, | |
216e3cd2 | 391 | .arg1_type = ARG_PTR_TO_MEM | MEM_RDONLY, |
39f19ebb | 392 | .arg2_type = ARG_CONST_SIZE, |
9c959c86 AS |
393 | }; |
394 | ||
4580f4e0 | 395 | static void __set_printk_clr_event(struct work_struct *work) |
0756ea3e AS |
396 | { |
397 | /* | |
ac5a72ea AM |
398 | * This program might be calling bpf_trace_printk, |
399 | * so enable the associated bpf_trace/bpf_trace_printk event. | |
400 | * Repeat this each time as it is possible a user has | |
401 | * disabled bpf_trace_printk events. By loading a program | |
402 | * calling bpf_trace_printk() however the user has expressed | |
403 | * the intent to see such events. | |
0756ea3e | 404 | */ |
ac5a72ea AM |
405 | if (trace_set_clr_event("bpf_trace", "bpf_trace_printk", 1)) |
406 | pr_warn_ratelimited("could not enable bpf_trace_printk events"); | |
10aceb62 | 407 | } |
4580f4e0 | 408 | static DECLARE_WORK(set_printk_work, __set_printk_clr_event); |
0756ea3e | 409 | |
10aceb62 DM |
410 | const struct bpf_func_proto *bpf_get_trace_printk_proto(void) |
411 | { | |
4580f4e0 | 412 | schedule_work(&set_printk_work); |
0756ea3e AS |
413 | return &bpf_trace_printk_proto; |
414 | } | |
415 | ||
78aa1cc9 | 416 | BPF_CALL_4(bpf_trace_vprintk, char *, fmt, u32, fmt_size, const void *, args, |
10aceb62 DM |
417 | u32, data_len) |
418 | { | |
78aa1cc9 JO |
419 | struct bpf_bprintf_data data = { |
420 | .get_bin_args = true, | |
e2bb9e01 | 421 | .get_buf = true, |
78aa1cc9 | 422 | }; |
10aceb62 | 423 | int ret, num_args; |
10aceb62 DM |
424 | |
425 | if (data_len & 7 || data_len > MAX_BPRINTF_VARARGS * 8 || | |
78aa1cc9 | 426 | (data_len && !args)) |
10aceb62 DM |
427 | return -EINVAL; |
428 | num_args = data_len / 8; | |
429 | ||
78aa1cc9 | 430 | ret = bpf_bprintf_prepare(fmt, fmt_size, args, num_args, &data); |
10aceb62 DM |
431 | if (ret < 0) |
432 | return ret; | |
433 | ||
e2bb9e01 | 434 | ret = bstr_printf(data.buf, MAX_BPRINTF_BUF, fmt, data.bin_args); |
10aceb62 | 435 | |
e2bb9e01 | 436 | trace_bpf_trace_printk(data.buf); |
10aceb62 | 437 | |
f19a4050 | 438 | bpf_bprintf_cleanup(&data); |
10aceb62 DM |
439 | |
440 | return ret; | |
441 | } | |
442 | ||
443 | static const struct bpf_func_proto bpf_trace_vprintk_proto = { | |
444 | .func = bpf_trace_vprintk, | |
445 | .gpl_only = true, | |
446 | .ret_type = RET_INTEGER, | |
216e3cd2 | 447 | .arg1_type = ARG_PTR_TO_MEM | MEM_RDONLY, |
10aceb62 | 448 | .arg2_type = ARG_CONST_SIZE, |
216e3cd2 | 449 | .arg3_type = ARG_PTR_TO_MEM | PTR_MAYBE_NULL | MEM_RDONLY, |
10aceb62 DM |
450 | .arg4_type = ARG_CONST_SIZE_OR_ZERO, |
451 | }; | |
452 | ||
453 | const struct bpf_func_proto *bpf_get_trace_vprintk_proto(void) | |
454 | { | |
4580f4e0 | 455 | schedule_work(&set_printk_work); |
10aceb62 DM |
456 | return &bpf_trace_vprintk_proto; |
457 | } | |
458 | ||
492e639f | 459 | BPF_CALL_5(bpf_seq_printf, struct seq_file *, m, char *, fmt, u32, fmt_size, |
78aa1cc9 | 460 | const void *, args, u32, data_len) |
492e639f | 461 | { |
78aa1cc9 JO |
462 | struct bpf_bprintf_data data = { |
463 | .get_bin_args = true, | |
464 | }; | |
d9c9e4db | 465 | int err, num_args; |
492e639f | 466 | |
335ff499 | 467 | if (data_len & 7 || data_len > MAX_BPRINTF_VARARGS * 8 || |
78aa1cc9 | 468 | (data_len && !args)) |
d9c9e4db | 469 | return -EINVAL; |
492e639f YS |
470 | num_args = data_len / 8; |
471 | ||
78aa1cc9 | 472 | err = bpf_bprintf_prepare(fmt, fmt_size, args, num_args, &data); |
d9c9e4db FR |
473 | if (err < 0) |
474 | return err; | |
492e639f | 475 | |
78aa1cc9 | 476 | seq_bprintf(m, fmt, data.bin_args); |
48cac3f4 | 477 | |
f19a4050 | 478 | bpf_bprintf_cleanup(&data); |
d9c9e4db FR |
479 | |
480 | return seq_has_overflowed(m) ? -EOVERFLOW : 0; | |
492e639f YS |
481 | } |
482 | ||
9436ef6e | 483 | BTF_ID_LIST_SINGLE(btf_seq_file_ids, struct, seq_file) |
c9a0f3b8 | 484 | |
492e639f YS |
485 | static const struct bpf_func_proto bpf_seq_printf_proto = { |
486 | .func = bpf_seq_printf, | |
487 | .gpl_only = true, | |
488 | .ret_type = RET_INTEGER, | |
489 | .arg1_type = ARG_PTR_TO_BTF_ID, | |
9436ef6e | 490 | .arg1_btf_id = &btf_seq_file_ids[0], |
216e3cd2 | 491 | .arg2_type = ARG_PTR_TO_MEM | MEM_RDONLY, |
492e639f | 492 | .arg3_type = ARG_CONST_SIZE, |
216e3cd2 | 493 | .arg4_type = ARG_PTR_TO_MEM | PTR_MAYBE_NULL | MEM_RDONLY, |
492e639f | 494 | .arg5_type = ARG_CONST_SIZE_OR_ZERO, |
492e639f YS |
495 | }; |
496 | ||
497 | BPF_CALL_3(bpf_seq_write, struct seq_file *, m, const void *, data, u32, len) | |
498 | { | |
499 | return seq_write(m, data, len) ? -EOVERFLOW : 0; | |
500 | } | |
501 | ||
492e639f YS |
502 | static const struct bpf_func_proto bpf_seq_write_proto = { |
503 | .func = bpf_seq_write, | |
504 | .gpl_only = true, | |
505 | .ret_type = RET_INTEGER, | |
506 | .arg1_type = ARG_PTR_TO_BTF_ID, | |
9436ef6e | 507 | .arg1_btf_id = &btf_seq_file_ids[0], |
216e3cd2 | 508 | .arg2_type = ARG_PTR_TO_MEM | MEM_RDONLY, |
492e639f | 509 | .arg3_type = ARG_CONST_SIZE_OR_ZERO, |
492e639f YS |
510 | }; |
511 | ||
eb411377 AM |
512 | BPF_CALL_4(bpf_seq_printf_btf, struct seq_file *, m, struct btf_ptr *, ptr, |
513 | u32, btf_ptr_size, u64, flags) | |
514 | { | |
515 | const struct btf *btf; | |
516 | s32 btf_id; | |
517 | int ret; | |
518 | ||
519 | ret = bpf_btf_printf_prepare(ptr, btf_ptr_size, flags, &btf, &btf_id); | |
520 | if (ret) | |
521 | return ret; | |
522 | ||
523 | return btf_type_seq_show_flags(btf, btf_id, ptr->ptr, m, flags); | |
524 | } | |
525 | ||
526 | static const struct bpf_func_proto bpf_seq_printf_btf_proto = { | |
527 | .func = bpf_seq_printf_btf, | |
528 | .gpl_only = true, | |
529 | .ret_type = RET_INTEGER, | |
530 | .arg1_type = ARG_PTR_TO_BTF_ID, | |
531 | .arg1_btf_id = &btf_seq_file_ids[0], | |
216e3cd2 | 532 | .arg2_type = ARG_PTR_TO_MEM | MEM_RDONLY, |
492e639f | 533 | .arg3_type = ARG_CONST_SIZE_OR_ZERO, |
eb411377 | 534 | .arg4_type = ARG_ANYTHING, |
492e639f YS |
535 | }; |
536 | ||
908432ca YS |
537 | static __always_inline int |
538 | get_map_perf_counter(struct bpf_map *map, u64 flags, | |
539 | u64 *value, u64 *enabled, u64 *running) | |
35578d79 | 540 | { |
35578d79 | 541 | struct bpf_array *array = container_of(map, struct bpf_array, map); |
6816a7ff DB |
542 | unsigned int cpu = smp_processor_id(); |
543 | u64 index = flags & BPF_F_INDEX_MASK; | |
3b1efb19 | 544 | struct bpf_event_entry *ee; |
35578d79 | 545 | |
6816a7ff DB |
546 | if (unlikely(flags & ~(BPF_F_INDEX_MASK))) |
547 | return -EINVAL; | |
548 | if (index == BPF_F_CURRENT_CPU) | |
549 | index = cpu; | |
35578d79 KX |
550 | if (unlikely(index >= array->map.max_entries)) |
551 | return -E2BIG; | |
552 | ||
3b1efb19 | 553 | ee = READ_ONCE(array->ptrs[index]); |
1ca1cc98 | 554 | if (!ee) |
35578d79 KX |
555 | return -ENOENT; |
556 | ||
908432ca YS |
557 | return perf_event_read_local(ee->event, value, enabled, running); |
558 | } | |
559 | ||
560 | BPF_CALL_2(bpf_perf_event_read, struct bpf_map *, map, u64, flags) | |
561 | { | |
562 | u64 value = 0; | |
563 | int err; | |
564 | ||
565 | err = get_map_perf_counter(map, flags, &value, NULL, NULL); | |
35578d79 | 566 | /* |
f91840a3 AS |
567 | * this api is ugly since we miss [-22..-2] range of valid |
568 | * counter values, but that's uapi | |
35578d79 | 569 | */ |
f91840a3 AS |
570 | if (err) |
571 | return err; | |
572 | return value; | |
35578d79 KX |
573 | } |
574 | ||
ee971630 | 575 | const struct bpf_func_proto bpf_perf_event_read_proto = { |
35578d79 | 576 | .func = bpf_perf_event_read, |
1075ef59 | 577 | .gpl_only = true, |
35578d79 KX |
578 | .ret_type = RET_INTEGER, |
579 | .arg1_type = ARG_CONST_MAP_PTR, | |
580 | .arg2_type = ARG_ANYTHING, | |
581 | }; | |
582 | ||
908432ca YS |
583 | BPF_CALL_4(bpf_perf_event_read_value, struct bpf_map *, map, u64, flags, |
584 | struct bpf_perf_event_value *, buf, u32, size) | |
585 | { | |
586 | int err = -EINVAL; | |
587 | ||
588 | if (unlikely(size != sizeof(struct bpf_perf_event_value))) | |
589 | goto clear; | |
590 | err = get_map_perf_counter(map, flags, &buf->counter, &buf->enabled, | |
591 | &buf->running); | |
592 | if (unlikely(err)) | |
593 | goto clear; | |
594 | return 0; | |
595 | clear: | |
596 | memset(buf, 0, size); | |
597 | return err; | |
598 | } | |
599 | ||
600 | static const struct bpf_func_proto bpf_perf_event_read_value_proto = { | |
601 | .func = bpf_perf_event_read_value, | |
602 | .gpl_only = true, | |
603 | .ret_type = RET_INTEGER, | |
604 | .arg1_type = ARG_CONST_MAP_PTR, | |
605 | .arg2_type = ARG_ANYTHING, | |
606 | .arg3_type = ARG_PTR_TO_UNINIT_MEM, | |
607 | .arg4_type = ARG_CONST_SIZE, | |
608 | }; | |
609 | ||
ae0a457f ET |
610 | const struct bpf_func_proto *bpf_get_perf_event_read_value_proto(void) |
611 | { | |
612 | return &bpf_perf_event_read_value_proto; | |
613 | } | |
614 | ||
8e7a3920 DB |
615 | static __always_inline u64 |
616 | __bpf_perf_event_output(struct pt_regs *regs, struct bpf_map *map, | |
b9c44b91 YC |
617 | u64 flags, struct perf_raw_record *raw, |
618 | struct perf_sample_data *sd) | |
a43eec30 | 619 | { |
a43eec30 | 620 | struct bpf_array *array = container_of(map, struct bpf_array, map); |
d7931330 | 621 | unsigned int cpu = smp_processor_id(); |
1e33759c | 622 | u64 index = flags & BPF_F_INDEX_MASK; |
3b1efb19 | 623 | struct bpf_event_entry *ee; |
a43eec30 | 624 | struct perf_event *event; |
a43eec30 | 625 | |
1e33759c | 626 | if (index == BPF_F_CURRENT_CPU) |
d7931330 | 627 | index = cpu; |
a43eec30 AS |
628 | if (unlikely(index >= array->map.max_entries)) |
629 | return -E2BIG; | |
630 | ||
3b1efb19 | 631 | ee = READ_ONCE(array->ptrs[index]); |
1ca1cc98 | 632 | if (!ee) |
a43eec30 AS |
633 | return -ENOENT; |
634 | ||
3b1efb19 | 635 | event = ee->event; |
a43eec30 AS |
636 | if (unlikely(event->attr.type != PERF_TYPE_SOFTWARE || |
637 | event->attr.config != PERF_COUNT_SW_BPF_OUTPUT)) | |
638 | return -EINVAL; | |
639 | ||
d7931330 | 640 | if (unlikely(event->oncpu != cpu)) |
a43eec30 AS |
641 | return -EOPNOTSUPP; |
642 | ||
b9c44b91 YC |
643 | perf_sample_save_raw_data(sd, event, raw); |
644 | ||
56201969 | 645 | return perf_event_output(event, sd, regs); |
a43eec30 AS |
646 | } |
647 | ||
9594dc3c MM |
648 | /* |
649 | * Support executing tracepoints in normal, irq, and nmi context that each call | |
650 | * bpf_perf_event_output | |
651 | */ | |
652 | struct bpf_trace_sample_data { | |
653 | struct perf_sample_data sds[3]; | |
654 | }; | |
655 | ||
656 | static DEFINE_PER_CPU(struct bpf_trace_sample_data, bpf_trace_sds); | |
657 | static DEFINE_PER_CPU(int, bpf_trace_nest_level); | |
f3694e00 DB |
658 | BPF_CALL_5(bpf_perf_event_output, struct pt_regs *, regs, struct bpf_map *, map, |
659 | u64, flags, void *, data, u64, size) | |
8e7a3920 | 660 | { |
f2c67a3e | 661 | struct bpf_trace_sample_data *sds; |
8e7a3920 DB |
662 | struct perf_raw_record raw = { |
663 | .frag = { | |
664 | .size = size, | |
665 | .data = data, | |
666 | }, | |
667 | }; | |
9594dc3c | 668 | struct perf_sample_data *sd; |
f2c67a3e JO |
669 | int nest_level, err; |
670 | ||
671 | preempt_disable(); | |
672 | sds = this_cpu_ptr(&bpf_trace_sds); | |
673 | nest_level = this_cpu_inc_return(bpf_trace_nest_level); | |
8e7a3920 | 674 | |
9594dc3c MM |
675 | if (WARN_ON_ONCE(nest_level > ARRAY_SIZE(sds->sds))) { |
676 | err = -EBUSY; | |
677 | goto out; | |
678 | } | |
679 | ||
680 | sd = &sds->sds[nest_level - 1]; | |
681 | ||
682 | if (unlikely(flags & ~(BPF_F_INDEX_MASK))) { | |
683 | err = -EINVAL; | |
684 | goto out; | |
685 | } | |
8e7a3920 | 686 | |
283ca526 | 687 | perf_sample_data_init(sd, 0, 0); |
283ca526 | 688 | |
b9c44b91 | 689 | err = __bpf_perf_event_output(regs, map, flags, &raw, sd); |
9594dc3c MM |
690 | out: |
691 | this_cpu_dec(bpf_trace_nest_level); | |
f2c67a3e | 692 | preempt_enable(); |
9594dc3c | 693 | return err; |
8e7a3920 DB |
694 | } |
695 | ||
a43eec30 AS |
696 | static const struct bpf_func_proto bpf_perf_event_output_proto = { |
697 | .func = bpf_perf_event_output, | |
1075ef59 | 698 | .gpl_only = true, |
a43eec30 AS |
699 | .ret_type = RET_INTEGER, |
700 | .arg1_type = ARG_PTR_TO_CTX, | |
701 | .arg2_type = ARG_CONST_MAP_PTR, | |
702 | .arg3_type = ARG_ANYTHING, | |
216e3cd2 | 703 | .arg4_type = ARG_PTR_TO_MEM | MEM_RDONLY, |
a60dd35d | 704 | .arg5_type = ARG_CONST_SIZE_OR_ZERO, |
a43eec30 AS |
705 | }; |
706 | ||
768fb61f AZ |
707 | static DEFINE_PER_CPU(int, bpf_event_output_nest_level); |
708 | struct bpf_nested_pt_regs { | |
709 | struct pt_regs regs[3]; | |
710 | }; | |
711 | static DEFINE_PER_CPU(struct bpf_nested_pt_regs, bpf_pt_regs); | |
712 | static DEFINE_PER_CPU(struct bpf_trace_sample_data, bpf_misc_sds); | |
bd570ff9 | 713 | |
555c8a86 DB |
714 | u64 bpf_event_output(struct bpf_map *map, u64 flags, void *meta, u64 meta_size, |
715 | void *ctx, u64 ctx_size, bpf_ctx_copy_t ctx_copy) | |
bd570ff9 | 716 | { |
555c8a86 DB |
717 | struct perf_raw_frag frag = { |
718 | .copy = ctx_copy, | |
719 | .size = ctx_size, | |
720 | .data = ctx, | |
721 | }; | |
722 | struct perf_raw_record raw = { | |
723 | .frag = { | |
183fc153 AM |
724 | { |
725 | .next = ctx_size ? &frag : NULL, | |
726 | }, | |
555c8a86 DB |
727 | .size = meta_size, |
728 | .data = meta, | |
729 | }, | |
730 | }; | |
768fb61f AZ |
731 | struct perf_sample_data *sd; |
732 | struct pt_regs *regs; | |
d62cc390 | 733 | int nest_level; |
768fb61f AZ |
734 | u64 ret; |
735 | ||
d62cc390 JO |
736 | preempt_disable(); |
737 | nest_level = this_cpu_inc_return(bpf_event_output_nest_level); | |
738 | ||
768fb61f AZ |
739 | if (WARN_ON_ONCE(nest_level > ARRAY_SIZE(bpf_misc_sds.sds))) { |
740 | ret = -EBUSY; | |
741 | goto out; | |
742 | } | |
743 | sd = this_cpu_ptr(&bpf_misc_sds.sds[nest_level - 1]); | |
744 | regs = this_cpu_ptr(&bpf_pt_regs.regs[nest_level - 1]); | |
bd570ff9 DB |
745 | |
746 | perf_fetch_caller_regs(regs); | |
283ca526 | 747 | perf_sample_data_init(sd, 0, 0); |
bd570ff9 | 748 | |
b9c44b91 | 749 | ret = __bpf_perf_event_output(regs, map, flags, &raw, sd); |
768fb61f AZ |
750 | out: |
751 | this_cpu_dec(bpf_event_output_nest_level); | |
d62cc390 | 752 | preempt_enable(); |
768fb61f | 753 | return ret; |
bd570ff9 DB |
754 | } |
755 | ||
f3694e00 | 756 | BPF_CALL_0(bpf_get_current_task) |
606274c5 AS |
757 | { |
758 | return (long) current; | |
759 | } | |
760 | ||
f470378c | 761 | const struct bpf_func_proto bpf_get_current_task_proto = { |
606274c5 AS |
762 | .func = bpf_get_current_task, |
763 | .gpl_only = true, | |
764 | .ret_type = RET_INTEGER, | |
765 | }; | |
766 | ||
3ca1032a KS |
767 | BPF_CALL_0(bpf_get_current_task_btf) |
768 | { | |
769 | return (unsigned long) current; | |
770 | } | |
771 | ||
a396eda5 | 772 | const struct bpf_func_proto bpf_get_current_task_btf_proto = { |
3ca1032a KS |
773 | .func = bpf_get_current_task_btf, |
774 | .gpl_only = true, | |
3f00c523 | 775 | .ret_type = RET_PTR_TO_BTF_ID_TRUSTED, |
d19ddb47 | 776 | .ret_btf_id = &btf_tracing_ids[BTF_TRACING_TYPE_TASK], |
3ca1032a KS |
777 | }; |
778 | ||
dd6e10fb DX |
779 | BPF_CALL_1(bpf_task_pt_regs, struct task_struct *, task) |
780 | { | |
781 | return (unsigned long) task_pt_regs(task); | |
782 | } | |
783 | ||
784 | BTF_ID_LIST(bpf_task_pt_regs_ids) | |
785 | BTF_ID(struct, pt_regs) | |
786 | ||
787 | const struct bpf_func_proto bpf_task_pt_regs_proto = { | |
788 | .func = bpf_task_pt_regs, | |
789 | .gpl_only = true, | |
790 | .arg1_type = ARG_PTR_TO_BTF_ID, | |
d19ddb47 | 791 | .arg1_btf_id = &btf_tracing_ids[BTF_TRACING_TYPE_TASK], |
dd6e10fb DX |
792 | .ret_type = RET_PTR_TO_BTF_ID, |
793 | .ret_btf_id = &bpf_task_pt_regs_ids[0], | |
794 | }; | |
795 | ||
8b401f9e YS |
796 | struct send_signal_irq_work { |
797 | struct irq_work irq_work; | |
798 | struct task_struct *task; | |
799 | u32 sig; | |
8482941f | 800 | enum pid_type type; |
6280cf71 PM |
801 | bool has_siginfo; |
802 | struct kernel_siginfo info; | |
8b401f9e YS |
803 | }; |
804 | ||
805 | static DEFINE_PER_CPU(struct send_signal_irq_work, send_signal_work); | |
806 | ||
807 | static void do_bpf_send_signal(struct irq_work *entry) | |
808 | { | |
809 | struct send_signal_irq_work *work; | |
6280cf71 | 810 | struct kernel_siginfo *siginfo; |
8b401f9e YS |
811 | |
812 | work = container_of(entry, struct send_signal_irq_work, irq_work); | |
6280cf71 PM |
813 | siginfo = work->has_siginfo ? &work->info : SEND_SIG_PRIV; |
814 | ||
815 | group_send_sig_info(work->sig, siginfo, work->task, work->type); | |
bdb7fdb0 | 816 | put_task_struct(work->task); |
8b401f9e YS |
817 | } |
818 | ||
6280cf71 | 819 | static int bpf_send_signal_common(u32 sig, enum pid_type type, struct task_struct *task, u64 value) |
8b401f9e YS |
820 | { |
821 | struct send_signal_irq_work *work = NULL; | |
6280cf71 PM |
822 | struct kernel_siginfo info; |
823 | struct kernel_siginfo *siginfo; | |
824 | ||
825 | if (!task) { | |
826 | task = current; | |
827 | siginfo = SEND_SIG_PRIV; | |
828 | } else { | |
829 | clear_siginfo(&info); | |
830 | info.si_signo = sig; | |
831 | info.si_errno = 0; | |
832 | info.si_code = SI_KERNEL; | |
833 | info.si_pid = 0; | |
834 | info.si_uid = 0; | |
835 | info.si_value.sival_ptr = (void *)(unsigned long)value; | |
836 | siginfo = &info; | |
837 | } | |
8b401f9e YS |
838 | |
839 | /* Similar to bpf_probe_write_user, task needs to be | |
840 | * in a sound condition and kernel memory access be | |
841 | * permitted in order to send signal to the current | |
842 | * task. | |
843 | */ | |
6280cf71 | 844 | if (unlikely(task->flags & (PF_KTHREAD | PF_EXITING))) |
8b401f9e | 845 | return -EPERM; |
8b401f9e YS |
846 | if (unlikely(!nmi_uaccess_okay())) |
847 | return -EPERM; | |
a3d81bc1 | 848 | /* Task should not be pid=1 to avoid kernel panic. */ |
6280cf71 | 849 | if (unlikely(is_global_init(task))) |
a3d81bc1 | 850 | return -EPERM; |
8b401f9e | 851 | |
b4a8b5bb | 852 | if (preempt_count() != 0 || irqs_disabled()) { |
e1afb702 YS |
853 | /* Do an early check on signal validity. Otherwise, |
854 | * the error is lost in deferred irq_work. | |
855 | */ | |
856 | if (unlikely(!valid_signal(sig))) | |
857 | return -EINVAL; | |
858 | ||
8b401f9e | 859 | work = this_cpu_ptr(&send_signal_work); |
7a9f50a0 | 860 | if (irq_work_is_busy(&work->irq_work)) |
8b401f9e YS |
861 | return -EBUSY; |
862 | ||
863 | /* Add the current task, which is the target of sending signal, | |
864 | * to the irq_work. The current task may change when queued | |
865 | * irq works get executed. | |
866 | */ | |
6280cf71 PM |
867 | work->task = get_task_struct(task); |
868 | work->has_siginfo = siginfo == &info; | |
869 | if (work->has_siginfo) | |
870 | copy_siginfo(&work->info, &info); | |
8b401f9e | 871 | work->sig = sig; |
8482941f | 872 | work->type = type; |
8b401f9e YS |
873 | irq_work_queue(&work->irq_work); |
874 | return 0; | |
875 | } | |
876 | ||
6280cf71 | 877 | return group_send_sig_info(sig, siginfo, task, type); |
8482941f YS |
878 | } |
879 | ||
880 | BPF_CALL_1(bpf_send_signal, u32, sig) | |
881 | { | |
6280cf71 | 882 | return bpf_send_signal_common(sig, PIDTYPE_TGID, NULL, 0); |
8b401f9e YS |
883 | } |
884 | ||
ee971630 | 885 | const struct bpf_func_proto bpf_send_signal_proto = { |
8b401f9e YS |
886 | .func = bpf_send_signal, |
887 | .gpl_only = false, | |
888 | .ret_type = RET_INTEGER, | |
889 | .arg1_type = ARG_ANYTHING, | |
890 | }; | |
891 | ||
8482941f YS |
892 | BPF_CALL_1(bpf_send_signal_thread, u32, sig) |
893 | { | |
6280cf71 | 894 | return bpf_send_signal_common(sig, PIDTYPE_PID, NULL, 0); |
8482941f YS |
895 | } |
896 | ||
ee971630 | 897 | const struct bpf_func_proto bpf_send_signal_thread_proto = { |
8482941f YS |
898 | .func = bpf_send_signal_thread, |
899 | .gpl_only = false, | |
900 | .ret_type = RET_INTEGER, | |
901 | .arg1_type = ARG_ANYTHING, | |
902 | }; | |
903 | ||
6e22ab9d JO |
904 | BPF_CALL_3(bpf_d_path, struct path *, path, char *, buf, u32, sz) |
905 | { | |
f46fab0e | 906 | struct path copy; |
6e22ab9d JO |
907 | long len; |
908 | char *p; | |
909 | ||
910 | if (!sz) | |
911 | return 0; | |
912 | ||
f46fab0e JO |
913 | /* |
914 | * The path pointer is verified as trusted and safe to use, | |
915 | * but let's double check it's valid anyway to workaround | |
916 | * potentially broken verifier. | |
917 | */ | |
918 | len = copy_from_kernel_nofault(©, path, sizeof(*path)); | |
919 | if (len < 0) | |
920 | return len; | |
921 | ||
922 | p = d_path(©, buf, sz); | |
6e22ab9d JO |
923 | if (IS_ERR(p)) { |
924 | len = PTR_ERR(p); | |
925 | } else { | |
926 | len = buf + sz - p; | |
927 | memmove(buf, p, len); | |
928 | } | |
929 | ||
930 | return len; | |
931 | } | |
932 | ||
933 | BTF_SET_START(btf_allowlist_d_path) | |
a8a71796 JO |
934 | #ifdef CONFIG_SECURITY |
935 | BTF_ID(func, security_file_permission) | |
936 | BTF_ID(func, security_inode_getattr) | |
937 | BTF_ID(func, security_file_open) | |
938 | #endif | |
939 | #ifdef CONFIG_SECURITY_PATH | |
940 | BTF_ID(func, security_path_truncate) | |
941 | #endif | |
6e22ab9d JO |
942 | BTF_ID(func, vfs_truncate) |
943 | BTF_ID(func, vfs_fallocate) | |
944 | BTF_ID(func, dentry_open) | |
945 | BTF_ID(func, vfs_getattr) | |
946 | BTF_ID(func, filp_close) | |
947 | BTF_SET_END(btf_allowlist_d_path) | |
948 | ||
949 | static bool bpf_d_path_allowed(const struct bpf_prog *prog) | |
950 | { | |
3d06f34a SL |
951 | if (prog->type == BPF_PROG_TYPE_TRACING && |
952 | prog->expected_attach_type == BPF_TRACE_ITER) | |
953 | return true; | |
954 | ||
6f100640 KS |
955 | if (prog->type == BPF_PROG_TYPE_LSM) |
956 | return bpf_lsm_is_sleepable_hook(prog->aux->attach_btf_id); | |
957 | ||
958 | return btf_id_set_contains(&btf_allowlist_d_path, | |
959 | prog->aux->attach_btf_id); | |
6e22ab9d JO |
960 | } |
961 | ||
9436ef6e | 962 | BTF_ID_LIST_SINGLE(bpf_d_path_btf_ids, struct, path) |
6e22ab9d JO |
963 | |
964 | static const struct bpf_func_proto bpf_d_path_proto = { | |
965 | .func = bpf_d_path, | |
966 | .gpl_only = false, | |
967 | .ret_type = RET_INTEGER, | |
968 | .arg1_type = ARG_PTR_TO_BTF_ID, | |
9436ef6e | 969 | .arg1_btf_id = &bpf_d_path_btf_ids[0], |
6e22ab9d JO |
970 | .arg2_type = ARG_PTR_TO_MEM, |
971 | .arg3_type = ARG_CONST_SIZE_OR_ZERO, | |
6e22ab9d JO |
972 | .allowed = bpf_d_path_allowed, |
973 | }; | |
974 | ||
c4d0bfb4 AM |
975 | #define BTF_F_ALL (BTF_F_COMPACT | BTF_F_NONAME | \ |
976 | BTF_F_PTR_RAW | BTF_F_ZERO) | |
977 | ||
978 | static int bpf_btf_printf_prepare(struct btf_ptr *ptr, u32 btf_ptr_size, | |
979 | u64 flags, const struct btf **btf, | |
980 | s32 *btf_id) | |
981 | { | |
982 | const struct btf_type *t; | |
983 | ||
984 | if (unlikely(flags & ~(BTF_F_ALL))) | |
985 | return -EINVAL; | |
986 | ||
987 | if (btf_ptr_size != sizeof(struct btf_ptr)) | |
988 | return -EINVAL; | |
989 | ||
990 | *btf = bpf_get_btf_vmlinux(); | |
991 | ||
992 | if (IS_ERR_OR_NULL(*btf)) | |
abbaa433 | 993 | return IS_ERR(*btf) ? PTR_ERR(*btf) : -EINVAL; |
c4d0bfb4 AM |
994 | |
995 | if (ptr->type_id > 0) | |
996 | *btf_id = ptr->type_id; | |
997 | else | |
998 | return -EINVAL; | |
999 | ||
1000 | if (*btf_id > 0) | |
1001 | t = btf_type_by_id(*btf, *btf_id); | |
1002 | if (*btf_id <= 0 || !t) | |
1003 | return -ENOENT; | |
1004 | ||
1005 | return 0; | |
1006 | } | |
1007 | ||
1008 | BPF_CALL_5(bpf_snprintf_btf, char *, str, u32, str_size, struct btf_ptr *, ptr, | |
1009 | u32, btf_ptr_size, u64, flags) | |
1010 | { | |
1011 | const struct btf *btf; | |
1012 | s32 btf_id; | |
1013 | int ret; | |
1014 | ||
1015 | ret = bpf_btf_printf_prepare(ptr, btf_ptr_size, flags, &btf, &btf_id); | |
1016 | if (ret) | |
1017 | return ret; | |
1018 | ||
1019 | return btf_type_snprintf_show(btf, btf_id, ptr->ptr, str, str_size, | |
1020 | flags); | |
1021 | } | |
1022 | ||
1023 | const struct bpf_func_proto bpf_snprintf_btf_proto = { | |
1024 | .func = bpf_snprintf_btf, | |
1025 | .gpl_only = false, | |
1026 | .ret_type = RET_INTEGER, | |
1027 | .arg1_type = ARG_PTR_TO_MEM, | |
1028 | .arg2_type = ARG_CONST_SIZE, | |
216e3cd2 | 1029 | .arg3_type = ARG_PTR_TO_MEM | MEM_RDONLY, |
c4d0bfb4 AM |
1030 | .arg4_type = ARG_CONST_SIZE, |
1031 | .arg5_type = ARG_ANYTHING, | |
1032 | }; | |
1033 | ||
9b99edca JO |
1034 | BPF_CALL_1(bpf_get_func_ip_tracing, void *, ctx) |
1035 | { | |
1036 | /* This helper call is inlined by verifier. */ | |
f92c1e18 | 1037 | return ((u64 *)ctx)[-2]; |
9b99edca JO |
1038 | } |
1039 | ||
1040 | static const struct bpf_func_proto bpf_get_func_ip_proto_tracing = { | |
1041 | .func = bpf_get_func_ip_tracing, | |
1042 | .gpl_only = true, | |
1043 | .ret_type = RET_INTEGER, | |
1044 | .arg1_type = ARG_PTR_TO_CTX, | |
1045 | }; | |
1046 | ||
72e213a7 | 1047 | static inline unsigned long get_entry_ip(unsigned long fentry_ip) |
c09eb2e5 | 1048 | { |
72e213a7 PZ |
1049 | #ifdef CONFIG_X86_KERNEL_IBT |
1050 | if (is_endbr((void *)(fentry_ip - ENDBR_INSN_SIZE))) | |
c09eb2e5 | 1051 | fentry_ip -= ENDBR_INSN_SIZE; |
72e213a7 | 1052 | #endif |
c09eb2e5 JO |
1053 | return fentry_ip; |
1054 | } | |
c09eb2e5 | 1055 | |
9ffd9f3f JO |
1056 | BPF_CALL_1(bpf_get_func_ip_kprobe, struct pt_regs *, regs) |
1057 | { | |
a3c485a5 JO |
1058 | struct bpf_trace_run_ctx *run_ctx __maybe_unused; |
1059 | struct kprobe *kp; | |
1060 | ||
1061 | #ifdef CONFIG_UPROBES | |
1062 | run_ctx = container_of(current->bpf_ctx, struct bpf_trace_run_ctx, run_ctx); | |
1063 | if (run_ctx->is_uprobe) | |
1064 | return ((struct uprobe_dispatch_data *)current->utask->vaddr)->bp_addr; | |
1065 | #endif | |
1066 | ||
1067 | kp = kprobe_running(); | |
9ffd9f3f | 1068 | |
0e253f7e JO |
1069 | if (!kp || !(kp->flags & KPROBE_FLAG_ON_FUNC_ENTRY)) |
1070 | return 0; | |
1071 | ||
1072 | return get_entry_ip((uintptr_t)kp->addr); | |
9ffd9f3f JO |
1073 | } |
1074 | ||
1075 | static const struct bpf_func_proto bpf_get_func_ip_proto_kprobe = { | |
1076 | .func = bpf_get_func_ip_kprobe, | |
1077 | .gpl_only = true, | |
1078 | .ret_type = RET_INTEGER, | |
1079 | .arg1_type = ARG_PTR_TO_CTX, | |
1080 | }; | |
1081 | ||
42a57120 JO |
1082 | BPF_CALL_1(bpf_get_func_ip_kprobe_multi, struct pt_regs *, regs) |
1083 | { | |
f7098690 | 1084 | return bpf_kprobe_multi_entry_ip(current->bpf_ctx); |
42a57120 JO |
1085 | } |
1086 | ||
1087 | static const struct bpf_func_proto bpf_get_func_ip_proto_kprobe_multi = { | |
1088 | .func = bpf_get_func_ip_kprobe_multi, | |
1089 | .gpl_only = false, | |
1090 | .ret_type = RET_INTEGER, | |
1091 | .arg1_type = ARG_PTR_TO_CTX, | |
1092 | }; | |
1093 | ||
ca74823c JO |
1094 | BPF_CALL_1(bpf_get_attach_cookie_kprobe_multi, struct pt_regs *, regs) |
1095 | { | |
f7098690 | 1096 | return bpf_kprobe_multi_cookie(current->bpf_ctx); |
ca74823c JO |
1097 | } |
1098 | ||
1099 | static const struct bpf_func_proto bpf_get_attach_cookie_proto_kmulti = { | |
1100 | .func = bpf_get_attach_cookie_kprobe_multi, | |
1101 | .gpl_only = false, | |
1102 | .ret_type = RET_INTEGER, | |
1103 | .arg1_type = ARG_PTR_TO_CTX, | |
1104 | }; | |
1105 | ||
686328d8 JO |
1106 | BPF_CALL_1(bpf_get_func_ip_uprobe_multi, struct pt_regs *, regs) |
1107 | { | |
1108 | return bpf_uprobe_multi_entry_ip(current->bpf_ctx); | |
1109 | } | |
1110 | ||
1111 | static const struct bpf_func_proto bpf_get_func_ip_proto_uprobe_multi = { | |
1112 | .func = bpf_get_func_ip_uprobe_multi, | |
1113 | .gpl_only = false, | |
1114 | .ret_type = RET_INTEGER, | |
1115 | .arg1_type = ARG_PTR_TO_CTX, | |
1116 | }; | |
1117 | ||
0b779b61 JO |
1118 | BPF_CALL_1(bpf_get_attach_cookie_uprobe_multi, struct pt_regs *, regs) |
1119 | { | |
1120 | return bpf_uprobe_multi_cookie(current->bpf_ctx); | |
1121 | } | |
1122 | ||
1123 | static const struct bpf_func_proto bpf_get_attach_cookie_proto_umulti = { | |
1124 | .func = bpf_get_attach_cookie_uprobe_multi, | |
1125 | .gpl_only = false, | |
1126 | .ret_type = RET_INTEGER, | |
1127 | .arg1_type = ARG_PTR_TO_CTX, | |
1128 | }; | |
1129 | ||
7adfc6c9 AN |
1130 | BPF_CALL_1(bpf_get_attach_cookie_trace, void *, ctx) |
1131 | { | |
1132 | struct bpf_trace_run_ctx *run_ctx; | |
1133 | ||
1134 | run_ctx = container_of(current->bpf_ctx, struct bpf_trace_run_ctx, run_ctx); | |
1135 | return run_ctx->bpf_cookie; | |
1136 | } | |
1137 | ||
1138 | static const struct bpf_func_proto bpf_get_attach_cookie_proto_trace = { | |
1139 | .func = bpf_get_attach_cookie_trace, | |
1140 | .gpl_only = false, | |
1141 | .ret_type = RET_INTEGER, | |
1142 | .arg1_type = ARG_PTR_TO_CTX, | |
1143 | }; | |
1144 | ||
1145 | BPF_CALL_1(bpf_get_attach_cookie_pe, struct bpf_perf_event_data_kern *, ctx) | |
1146 | { | |
1147 | return ctx->event->bpf_cookie; | |
1148 | } | |
1149 | ||
1150 | static const struct bpf_func_proto bpf_get_attach_cookie_proto_pe = { | |
1151 | .func = bpf_get_attach_cookie_pe, | |
1152 | .gpl_only = false, | |
1153 | .ret_type = RET_INTEGER, | |
1154 | .arg1_type = ARG_PTR_TO_CTX, | |
1155 | }; | |
1156 | ||
2fcc8241 KFL |
1157 | BPF_CALL_1(bpf_get_attach_cookie_tracing, void *, ctx) |
1158 | { | |
1159 | struct bpf_trace_run_ctx *run_ctx; | |
1160 | ||
1161 | run_ctx = container_of(current->bpf_ctx, struct bpf_trace_run_ctx, run_ctx); | |
1162 | return run_ctx->bpf_cookie; | |
1163 | } | |
1164 | ||
1165 | static const struct bpf_func_proto bpf_get_attach_cookie_proto_tracing = { | |
1166 | .func = bpf_get_attach_cookie_tracing, | |
1167 | .gpl_only = false, | |
1168 | .ret_type = RET_INTEGER, | |
1169 | .arg1_type = ARG_PTR_TO_CTX, | |
1170 | }; | |
1171 | ||
856c02db SL |
1172 | BPF_CALL_3(bpf_get_branch_snapshot, void *, buf, u32, size, u64, flags) |
1173 | { | |
856c02db SL |
1174 | static const u32 br_entry_size = sizeof(struct perf_branch_entry); |
1175 | u32 entry_cnt = size / br_entry_size; | |
1176 | ||
1177 | entry_cnt = static_call(perf_snapshot_branch_stack)(buf, entry_cnt); | |
1178 | ||
1179 | if (unlikely(flags)) | |
1180 | return -EINVAL; | |
1181 | ||
1182 | if (!entry_cnt) | |
1183 | return -ENOENT; | |
1184 | ||
1185 | return entry_cnt * br_entry_size; | |
856c02db SL |
1186 | } |
1187 | ||
ee971630 | 1188 | const struct bpf_func_proto bpf_get_branch_snapshot_proto = { |
856c02db SL |
1189 | .func = bpf_get_branch_snapshot, |
1190 | .gpl_only = true, | |
1191 | .ret_type = RET_INTEGER, | |
1192 | .arg1_type = ARG_PTR_TO_UNINIT_MEM, | |
1193 | .arg2_type = ARG_CONST_SIZE_OR_ZERO, | |
1194 | }; | |
1195 | ||
f92c1e18 JO |
1196 | BPF_CALL_3(get_func_arg, void *, ctx, u32, n, u64 *, value) |
1197 | { | |
1198 | /* This helper call is inlined by verifier. */ | |
1199 | u64 nr_args = ((u64 *)ctx)[-1]; | |
1200 | ||
1201 | if ((u64) n >= nr_args) | |
1202 | return -EINVAL; | |
1203 | *value = ((u64 *)ctx)[n]; | |
1204 | return 0; | |
1205 | } | |
1206 | ||
1207 | static const struct bpf_func_proto bpf_get_func_arg_proto = { | |
1208 | .func = get_func_arg, | |
1209 | .ret_type = RET_INTEGER, | |
1210 | .arg1_type = ARG_PTR_TO_CTX, | |
1211 | .arg2_type = ARG_ANYTHING, | |
6fad274f | 1212 | .arg3_type = ARG_PTR_TO_FIXED_SIZE_MEM | MEM_UNINIT | MEM_WRITE | MEM_ALIGNED, |
32556ce9 | 1213 | .arg3_size = sizeof(u64), |
f92c1e18 JO |
1214 | }; |
1215 | ||
1216 | BPF_CALL_2(get_func_ret, void *, ctx, u64 *, value) | |
1217 | { | |
1218 | /* This helper call is inlined by verifier. */ | |
1219 | u64 nr_args = ((u64 *)ctx)[-1]; | |
1220 | ||
1221 | *value = ((u64 *)ctx)[nr_args]; | |
1222 | return 0; | |
1223 | } | |
1224 | ||
1225 | static const struct bpf_func_proto bpf_get_func_ret_proto = { | |
1226 | .func = get_func_ret, | |
1227 | .ret_type = RET_INTEGER, | |
1228 | .arg1_type = ARG_PTR_TO_CTX, | |
6fad274f | 1229 | .arg2_type = ARG_PTR_TO_FIXED_SIZE_MEM | MEM_UNINIT | MEM_WRITE | MEM_ALIGNED, |
32556ce9 | 1230 | .arg2_size = sizeof(u64), |
f92c1e18 JO |
1231 | }; |
1232 | ||
1233 | BPF_CALL_1(get_func_arg_cnt, void *, ctx) | |
1234 | { | |
1235 | /* This helper call is inlined by verifier. */ | |
1236 | return ((u64 *)ctx)[-1]; | |
1237 | } | |
1238 | ||
1239 | static const struct bpf_func_proto bpf_get_func_arg_cnt_proto = { | |
1240 | .func = get_func_arg_cnt, | |
1241 | .ret_type = RET_INTEGER, | |
1242 | .arg1_type = ARG_PTR_TO_CTX, | |
1243 | }; | |
1244 | ||
f3cf4134 | 1245 | #ifdef CONFIG_KEYS |
391145ba | 1246 | __bpf_kfunc_start_defs(); |
f3cf4134 RS |
1247 | |
1248 | /** | |
1249 | * bpf_lookup_user_key - lookup a key by its serial | |
1250 | * @serial: key handle serial number | |
1251 | * @flags: lookup-specific flags | |
1252 | * | |
1253 | * Search a key with a given *serial* and the provided *flags*. | |
1254 | * If found, increment the reference count of the key by one, and | |
1255 | * return it in the bpf_key structure. | |
1256 | * | |
1257 | * The bpf_key structure must be passed to bpf_key_put() when done | |
1258 | * with it, so that the key reference count is decremented and the | |
1259 | * bpf_key structure is freed. | |
1260 | * | |
1261 | * Permission checks are deferred to the time the key is used by | |
1262 | * one of the available key-specific kfuncs. | |
1263 | * | |
1264 | * Set *flags* with KEY_LOOKUP_CREATE, to attempt creating a requested | |
1265 | * special keyring (e.g. session keyring), if it doesn't yet exist. | |
1266 | * Set *flags* with KEY_LOOKUP_PARTIAL, to lookup a key without waiting | |
1267 | * for the key construction, and to retrieve uninstantiated keys (keys | |
1268 | * without data attached to them). | |
1269 | * | |
1270 | * Return: a bpf_key pointer with a valid key pointer if the key is found, a | |
1271 | * NULL pointer otherwise. | |
1272 | */ | |
400031e0 | 1273 | __bpf_kfunc struct bpf_key *bpf_lookup_user_key(u32 serial, u64 flags) |
f3cf4134 RS |
1274 | { |
1275 | key_ref_t key_ref; | |
1276 | struct bpf_key *bkey; | |
1277 | ||
1278 | if (flags & ~KEY_LOOKUP_ALL) | |
1279 | return NULL; | |
1280 | ||
1281 | /* | |
1282 | * Permission check is deferred until the key is used, as the | |
1283 | * intent of the caller is unknown here. | |
1284 | */ | |
1285 | key_ref = lookup_user_key(serial, flags, KEY_DEFER_PERM_CHECK); | |
1286 | if (IS_ERR(key_ref)) | |
1287 | return NULL; | |
1288 | ||
1289 | bkey = kmalloc(sizeof(*bkey), GFP_KERNEL); | |
1290 | if (!bkey) { | |
1291 | key_put(key_ref_to_ptr(key_ref)); | |
1292 | return NULL; | |
1293 | } | |
1294 | ||
1295 | bkey->key = key_ref_to_ptr(key_ref); | |
1296 | bkey->has_ref = true; | |
1297 | ||
1298 | return bkey; | |
1299 | } | |
1300 | ||
1301 | /** | |
1302 | * bpf_lookup_system_key - lookup a key by a system-defined ID | |
1303 | * @id: key ID | |
1304 | * | |
1305 | * Obtain a bpf_key structure with a key pointer set to the passed key ID. | |
1306 | * The key pointer is marked as invalid, to prevent bpf_key_put() from | |
1307 | * attempting to decrement the key reference count on that pointer. The key | |
1308 | * pointer set in such way is currently understood only by | |
1309 | * verify_pkcs7_signature(). | |
1310 | * | |
1311 | * Set *id* to one of the values defined in include/linux/verification.h: | |
1312 | * 0 for the primary keyring (immutable keyring of system keys); | |
1313 | * VERIFY_USE_SECONDARY_KEYRING for both the primary and secondary keyring | |
1314 | * (where keys can be added only if they are vouched for by existing keys | |
1315 | * in those keyrings); VERIFY_USE_PLATFORM_KEYRING for the platform | |
1316 | * keyring (primarily used by the integrity subsystem to verify a kexec'ed | |
1317 | * kerned image and, possibly, the initramfs signature). | |
1318 | * | |
1319 | * Return: a bpf_key pointer with an invalid key pointer set from the | |
1320 | * pre-determined ID on success, a NULL pointer otherwise | |
1321 | */ | |
400031e0 | 1322 | __bpf_kfunc struct bpf_key *bpf_lookup_system_key(u64 id) |
f3cf4134 RS |
1323 | { |
1324 | struct bpf_key *bkey; | |
1325 | ||
1326 | if (system_keyring_id_check(id) < 0) | |
1327 | return NULL; | |
1328 | ||
1329 | bkey = kmalloc(sizeof(*bkey), GFP_ATOMIC); | |
1330 | if (!bkey) | |
1331 | return NULL; | |
1332 | ||
1333 | bkey->key = (struct key *)(unsigned long)id; | |
1334 | bkey->has_ref = false; | |
1335 | ||
1336 | return bkey; | |
1337 | } | |
1338 | ||
1339 | /** | |
1340 | * bpf_key_put - decrement key reference count if key is valid and free bpf_key | |
1341 | * @bkey: bpf_key structure | |
1342 | * | |
1343 | * Decrement the reference count of the key inside *bkey*, if the pointer | |
1344 | * is valid, and free *bkey*. | |
1345 | */ | |
400031e0 | 1346 | __bpf_kfunc void bpf_key_put(struct bpf_key *bkey) |
f3cf4134 RS |
1347 | { |
1348 | if (bkey->has_ref) | |
1349 | key_put(bkey->key); | |
1350 | ||
1351 | kfree(bkey); | |
1352 | } | |
1353 | ||
865b0566 RS |
1354 | #ifdef CONFIG_SYSTEM_DATA_VERIFICATION |
1355 | /** | |
1356 | * bpf_verify_pkcs7_signature - verify a PKCS#7 signature | |
cce4c40b DX |
1357 | * @data_p: data to verify |
1358 | * @sig_p: signature of the data | |
865b0566 RS |
1359 | * @trusted_keyring: keyring with keys trusted for signature verification |
1360 | * | |
1361 | * Verify the PKCS#7 signature *sig_ptr* against the supplied *data_ptr* | |
1362 | * with keys in a keyring referenced by *trusted_keyring*. | |
1363 | * | |
1364 | * Return: 0 on success, a negative value on error. | |
1365 | */ | |
cce4c40b DX |
1366 | __bpf_kfunc int bpf_verify_pkcs7_signature(struct bpf_dynptr *data_p, |
1367 | struct bpf_dynptr *sig_p, | |
865b0566 RS |
1368 | struct bpf_key *trusted_keyring) |
1369 | { | |
cce4c40b DX |
1370 | struct bpf_dynptr_kern *data_ptr = (struct bpf_dynptr_kern *)data_p; |
1371 | struct bpf_dynptr_kern *sig_ptr = (struct bpf_dynptr_kern *)sig_p; | |
74523c06 SL |
1372 | const void *data, *sig; |
1373 | u32 data_len, sig_len; | |
865b0566 RS |
1374 | int ret; |
1375 | ||
1376 | if (trusted_keyring->has_ref) { | |
1377 | /* | |
1378 | * Do the permission check deferred in bpf_lookup_user_key(). | |
1379 | * See bpf_lookup_user_key() for more details. | |
1380 | * | |
1381 | * A call to key_task_permission() here would be redundant, as | |
1382 | * it is already done by keyring_search() called by | |
1383 | * find_asymmetric_key(). | |
1384 | */ | |
1385 | ret = key_validate(trusted_keyring->key); | |
1386 | if (ret < 0) | |
1387 | return ret; | |
1388 | } | |
1389 | ||
74523c06 SL |
1390 | data_len = __bpf_dynptr_size(data_ptr); |
1391 | data = __bpf_dynptr_data(data_ptr, data_len); | |
1392 | sig_len = __bpf_dynptr_size(sig_ptr); | |
1393 | sig = __bpf_dynptr_data(sig_ptr, sig_len); | |
1394 | ||
1395 | return verify_pkcs7_signature(data, data_len, sig, sig_len, | |
865b0566 RS |
1396 | trusted_keyring->key, |
1397 | VERIFYING_UNSPECIFIED_SIGNATURE, NULL, | |
1398 | NULL); | |
1399 | } | |
1400 | #endif /* CONFIG_SYSTEM_DATA_VERIFICATION */ | |
1401 | ||
391145ba | 1402 | __bpf_kfunc_end_defs(); |
f3cf4134 | 1403 | |
6f3189f3 | 1404 | BTF_KFUNCS_START(key_sig_kfunc_set) |
f3cf4134 RS |
1405 | BTF_ID_FLAGS(func, bpf_lookup_user_key, KF_ACQUIRE | KF_RET_NULL | KF_SLEEPABLE) |
1406 | BTF_ID_FLAGS(func, bpf_lookup_system_key, KF_ACQUIRE | KF_RET_NULL) | |
1407 | BTF_ID_FLAGS(func, bpf_key_put, KF_RELEASE) | |
865b0566 RS |
1408 | #ifdef CONFIG_SYSTEM_DATA_VERIFICATION |
1409 | BTF_ID_FLAGS(func, bpf_verify_pkcs7_signature, KF_SLEEPABLE) | |
1410 | #endif | |
6f3189f3 | 1411 | BTF_KFUNCS_END(key_sig_kfunc_set) |
f3cf4134 RS |
1412 | |
1413 | static const struct btf_kfunc_id_set bpf_key_sig_kfunc_set = { | |
1414 | .owner = THIS_MODULE, | |
1415 | .set = &key_sig_kfunc_set, | |
1416 | }; | |
1417 | ||
1418 | static int __init bpf_key_sig_kfuncs_init(void) | |
1419 | { | |
1420 | return register_btf_kfunc_id_set(BPF_PROG_TYPE_TRACING, | |
1421 | &bpf_key_sig_kfunc_set); | |
1422 | } | |
1423 | ||
1424 | late_initcall(bpf_key_sig_kfuncs_init); | |
1425 | #endif /* CONFIG_KEYS */ | |
1426 | ||
7adfc6c9 | 1427 | static const struct bpf_func_proto * |
fc611f47 | 1428 | bpf_tracing_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) |
2541517c | 1429 | { |
3bfb49d7 ME |
1430 | const struct bpf_func_proto *func_proto; |
1431 | ||
2541517c | 1432 | switch (func_id) { |
ab1973d3 AS |
1433 | case BPF_FUNC_get_smp_processor_id: |
1434 | return &bpf_get_smp_processor_id_proto; | |
0ebeea8c DB |
1435 | #ifdef CONFIG_ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE |
1436 | case BPF_FUNC_probe_read: | |
71330842 | 1437 | return security_locked_down(LOCKDOWN_BPF_READ_KERNEL) < 0 ? |
ff40e510 | 1438 | NULL : &bpf_probe_read_compat_proto; |
a5e8c070 | 1439 | case BPF_FUNC_probe_read_str: |
71330842 | 1440 | return security_locked_down(LOCKDOWN_BPF_READ_KERNEL) < 0 ? |
ff40e510 | 1441 | NULL : &bpf_probe_read_compat_str_proto; |
0ebeea8c | 1442 | #endif |
9b99edca JO |
1443 | case BPF_FUNC_get_func_ip: |
1444 | return &bpf_get_func_ip_proto_tracing; | |
9fd82b61 | 1445 | default: |
3bfb49d7 ME |
1446 | break; |
1447 | } | |
1448 | ||
1449 | func_proto = bpf_base_func_proto(func_id, prog); | |
1450 | if (func_proto) | |
1451 | return func_proto; | |
1452 | ||
1453 | if (!bpf_token_capable(prog->aux->token, CAP_SYS_ADMIN)) | |
1454 | return NULL; | |
1455 | ||
1456 | switch (func_id) { | |
1457 | case BPF_FUNC_probe_write_user: | |
1458 | return security_locked_down(LOCKDOWN_BPF_WRITE_USER) < 0 ? | |
1459 | NULL : &bpf_probe_write_user_proto; | |
1460 | default: | |
1461 | return NULL; | |
9fd82b61 AS |
1462 | } |
1463 | } | |
1464 | ||
535a3692 JO |
1465 | static bool is_kprobe_multi(const struct bpf_prog *prog) |
1466 | { | |
1467 | return prog->expected_attach_type == BPF_TRACE_KPROBE_MULTI || | |
1468 | prog->expected_attach_type == BPF_TRACE_KPROBE_SESSION; | |
1469 | } | |
1470 | ||
1471 | static inline bool is_kprobe_session(const struct bpf_prog *prog) | |
1472 | { | |
1473 | return prog->expected_attach_type == BPF_TRACE_KPROBE_SESSION; | |
1474 | } | |
1475 | ||
d920179b JO |
1476 | static inline bool is_uprobe_multi(const struct bpf_prog *prog) |
1477 | { | |
1478 | return prog->expected_attach_type == BPF_TRACE_UPROBE_MULTI || | |
1479 | prog->expected_attach_type == BPF_TRACE_UPROBE_SESSION; | |
1480 | } | |
1481 | ||
1482 | static inline bool is_uprobe_session(const struct bpf_prog *prog) | |
1483 | { | |
1484 | return prog->expected_attach_type == BPF_TRACE_UPROBE_SESSION; | |
1485 | } | |
1486 | ||
5e43f899 AI |
1487 | static const struct bpf_func_proto * |
1488 | kprobe_prog_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) | |
9fd82b61 AS |
1489 | { |
1490 | switch (func_id) { | |
a43eec30 AS |
1491 | case BPF_FUNC_perf_event_output: |
1492 | return &bpf_perf_event_output_proto; | |
d5a3b1f6 AS |
1493 | case BPF_FUNC_get_stackid: |
1494 | return &bpf_get_stackid_proto; | |
c195651e | 1495 | case BPF_FUNC_get_stack: |
d4dd9775 | 1496 | return prog->sleepable ? &bpf_get_stack_sleepable_proto : &bpf_get_stack_proto; |
9802d865 JB |
1497 | #ifdef CONFIG_BPF_KPROBE_OVERRIDE |
1498 | case BPF_FUNC_override_return: | |
1499 | return &bpf_override_return_proto; | |
1500 | #endif | |
9ffd9f3f | 1501 | case BPF_FUNC_get_func_ip: |
535a3692 | 1502 | if (is_kprobe_multi(prog)) |
686328d8 | 1503 | return &bpf_get_func_ip_proto_kprobe_multi; |
d920179b | 1504 | if (is_uprobe_multi(prog)) |
686328d8 JO |
1505 | return &bpf_get_func_ip_proto_uprobe_multi; |
1506 | return &bpf_get_func_ip_proto_kprobe; | |
7adfc6c9 | 1507 | case BPF_FUNC_get_attach_cookie: |
535a3692 | 1508 | if (is_kprobe_multi(prog)) |
0b779b61 | 1509 | return &bpf_get_attach_cookie_proto_kmulti; |
d920179b | 1510 | if (is_uprobe_multi(prog)) |
0b779b61 JO |
1511 | return &bpf_get_attach_cookie_proto_umulti; |
1512 | return &bpf_get_attach_cookie_proto_trace; | |
2541517c | 1513 | default: |
fc611f47 | 1514 | return bpf_tracing_func_proto(func_id, prog); |
2541517c AS |
1515 | } |
1516 | } | |
1517 | ||
1518 | /* bpf+kprobe programs can access fields of 'struct pt_regs' */ | |
19de99f7 | 1519 | static bool kprobe_prog_is_valid_access(int off, int size, enum bpf_access_type type, |
5e43f899 | 1520 | const struct bpf_prog *prog, |
23994631 | 1521 | struct bpf_insn_access_aux *info) |
2541517c | 1522 | { |
2541517c AS |
1523 | if (off < 0 || off >= sizeof(struct pt_regs)) |
1524 | return false; | |
2541517c AS |
1525 | if (type != BPF_READ) |
1526 | return false; | |
2541517c AS |
1527 | if (off % size != 0) |
1528 | return false; | |
2d071c64 DB |
1529 | /* |
1530 | * Assertion for 32 bit to make sure last 8 byte access | |
1531 | * (BPF_DW) to the last 4 byte member is disallowed. | |
1532 | */ | |
1533 | if (off + size > sizeof(struct pt_regs)) | |
1534 | return false; | |
1535 | ||
2541517c AS |
1536 | return true; |
1537 | } | |
1538 | ||
7de16e3a | 1539 | const struct bpf_verifier_ops kprobe_verifier_ops = { |
2541517c AS |
1540 | .get_func_proto = kprobe_prog_func_proto, |
1541 | .is_valid_access = kprobe_prog_is_valid_access, | |
1542 | }; | |
1543 | ||
7de16e3a JK |
1544 | const struct bpf_prog_ops kprobe_prog_ops = { |
1545 | }; | |
1546 | ||
f3694e00 DB |
1547 | BPF_CALL_5(bpf_perf_event_output_tp, void *, tp_buff, struct bpf_map *, map, |
1548 | u64, flags, void *, data, u64, size) | |
9940d67c | 1549 | { |
f3694e00 DB |
1550 | struct pt_regs *regs = *(struct pt_regs **)tp_buff; |
1551 | ||
9940d67c AS |
1552 | /* |
1553 | * r1 points to perf tracepoint buffer where first 8 bytes are hidden | |
1554 | * from bpf program and contain a pointer to 'struct pt_regs'. Fetch it | |
f3694e00 | 1555 | * from there and call the same bpf_perf_event_output() helper inline. |
9940d67c | 1556 | */ |
f3694e00 | 1557 | return ____bpf_perf_event_output(regs, map, flags, data, size); |
9940d67c AS |
1558 | } |
1559 | ||
1560 | static const struct bpf_func_proto bpf_perf_event_output_proto_tp = { | |
1561 | .func = bpf_perf_event_output_tp, | |
1562 | .gpl_only = true, | |
1563 | .ret_type = RET_INTEGER, | |
1564 | .arg1_type = ARG_PTR_TO_CTX, | |
1565 | .arg2_type = ARG_CONST_MAP_PTR, | |
1566 | .arg3_type = ARG_ANYTHING, | |
216e3cd2 | 1567 | .arg4_type = ARG_PTR_TO_MEM | MEM_RDONLY, |
a60dd35d | 1568 | .arg5_type = ARG_CONST_SIZE_OR_ZERO, |
9940d67c AS |
1569 | }; |
1570 | ||
f3694e00 DB |
1571 | BPF_CALL_3(bpf_get_stackid_tp, void *, tp_buff, struct bpf_map *, map, |
1572 | u64, flags) | |
9940d67c | 1573 | { |
f3694e00 | 1574 | struct pt_regs *regs = *(struct pt_regs **)tp_buff; |
9940d67c | 1575 | |
f3694e00 DB |
1576 | /* |
1577 | * Same comment as in bpf_perf_event_output_tp(), only that this time | |
1578 | * the other helper's function body cannot be inlined due to being | |
1579 | * external, thus we need to call raw helper function. | |
1580 | */ | |
1581 | return bpf_get_stackid((unsigned long) regs, (unsigned long) map, | |
1582 | flags, 0, 0); | |
9940d67c AS |
1583 | } |
1584 | ||
1585 | static const struct bpf_func_proto bpf_get_stackid_proto_tp = { | |
1586 | .func = bpf_get_stackid_tp, | |
1587 | .gpl_only = true, | |
1588 | .ret_type = RET_INTEGER, | |
1589 | .arg1_type = ARG_PTR_TO_CTX, | |
1590 | .arg2_type = ARG_CONST_MAP_PTR, | |
1591 | .arg3_type = ARG_ANYTHING, | |
1592 | }; | |
1593 | ||
c195651e YS |
1594 | BPF_CALL_4(bpf_get_stack_tp, void *, tp_buff, void *, buf, u32, size, |
1595 | u64, flags) | |
1596 | { | |
1597 | struct pt_regs *regs = *(struct pt_regs **)tp_buff; | |
1598 | ||
1599 | return bpf_get_stack((unsigned long) regs, (unsigned long) buf, | |
1600 | (unsigned long) size, flags, 0); | |
1601 | } | |
1602 | ||
1603 | static const struct bpf_func_proto bpf_get_stack_proto_tp = { | |
1604 | .func = bpf_get_stack_tp, | |
1605 | .gpl_only = true, | |
1606 | .ret_type = RET_INTEGER, | |
1607 | .arg1_type = ARG_PTR_TO_CTX, | |
1608 | .arg2_type = ARG_PTR_TO_UNINIT_MEM, | |
1609 | .arg3_type = ARG_CONST_SIZE_OR_ZERO, | |
1610 | .arg4_type = ARG_ANYTHING, | |
1611 | }; | |
1612 | ||
5e43f899 AI |
1613 | static const struct bpf_func_proto * |
1614 | tp_prog_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) | |
f005afed YS |
1615 | { |
1616 | switch (func_id) { | |
1617 | case BPF_FUNC_perf_event_output: | |
1618 | return &bpf_perf_event_output_proto_tp; | |
1619 | case BPF_FUNC_get_stackid: | |
1620 | return &bpf_get_stackid_proto_tp; | |
c195651e YS |
1621 | case BPF_FUNC_get_stack: |
1622 | return &bpf_get_stack_proto_tp; | |
7adfc6c9 AN |
1623 | case BPF_FUNC_get_attach_cookie: |
1624 | return &bpf_get_attach_cookie_proto_trace; | |
f005afed | 1625 | default: |
fc611f47 | 1626 | return bpf_tracing_func_proto(func_id, prog); |
f005afed YS |
1627 | } |
1628 | } | |
1629 | ||
1630 | static bool tp_prog_is_valid_access(int off, int size, enum bpf_access_type type, | |
5e43f899 | 1631 | const struct bpf_prog *prog, |
f005afed YS |
1632 | struct bpf_insn_access_aux *info) |
1633 | { | |
1634 | if (off < sizeof(void *) || off >= PERF_MAX_TRACE_SIZE) | |
1635 | return false; | |
1636 | if (type != BPF_READ) | |
1637 | return false; | |
1638 | if (off % size != 0) | |
1639 | return false; | |
1640 | ||
1641 | BUILD_BUG_ON(PERF_MAX_TRACE_SIZE % sizeof(__u64)); | |
1642 | return true; | |
1643 | } | |
1644 | ||
1645 | const struct bpf_verifier_ops tracepoint_verifier_ops = { | |
1646 | .get_func_proto = tp_prog_func_proto, | |
1647 | .is_valid_access = tp_prog_is_valid_access, | |
1648 | }; | |
1649 | ||
1650 | const struct bpf_prog_ops tracepoint_prog_ops = { | |
1651 | }; | |
1652 | ||
1653 | BPF_CALL_3(bpf_perf_prog_read_value, struct bpf_perf_event_data_kern *, ctx, | |
4bebdc7a YS |
1654 | struct bpf_perf_event_value *, buf, u32, size) |
1655 | { | |
1656 | int err = -EINVAL; | |
1657 | ||
1658 | if (unlikely(size != sizeof(struct bpf_perf_event_value))) | |
1659 | goto clear; | |
1660 | err = perf_event_read_local(ctx->event, &buf->counter, &buf->enabled, | |
1661 | &buf->running); | |
1662 | if (unlikely(err)) | |
1663 | goto clear; | |
1664 | return 0; | |
1665 | clear: | |
1666 | memset(buf, 0, size); | |
1667 | return err; | |
1668 | } | |
1669 | ||
f005afed YS |
1670 | static const struct bpf_func_proto bpf_perf_prog_read_value_proto = { |
1671 | .func = bpf_perf_prog_read_value, | |
4bebdc7a YS |
1672 | .gpl_only = true, |
1673 | .ret_type = RET_INTEGER, | |
1674 | .arg1_type = ARG_PTR_TO_CTX, | |
1675 | .arg2_type = ARG_PTR_TO_UNINIT_MEM, | |
1676 | .arg3_type = ARG_CONST_SIZE, | |
1677 | }; | |
1678 | ||
fff7b643 DX |
1679 | BPF_CALL_4(bpf_read_branch_records, struct bpf_perf_event_data_kern *, ctx, |
1680 | void *, buf, u32, size, u64, flags) | |
1681 | { | |
fff7b643 DX |
1682 | static const u32 br_entry_size = sizeof(struct perf_branch_entry); |
1683 | struct perf_branch_stack *br_stack = ctx->data->br_stack; | |
1684 | u32 to_copy; | |
1685 | ||
1686 | if (unlikely(flags & ~BPF_F_GET_BRANCH_RECORDS_SIZE)) | |
1687 | return -EINVAL; | |
1688 | ||
cce6a2d7 JO |
1689 | if (unlikely(!(ctx->data->sample_flags & PERF_SAMPLE_BRANCH_STACK))) |
1690 | return -ENOENT; | |
1691 | ||
fff7b643 | 1692 | if (unlikely(!br_stack)) |
db52f572 | 1693 | return -ENOENT; |
fff7b643 DX |
1694 | |
1695 | if (flags & BPF_F_GET_BRANCH_RECORDS_SIZE) | |
1696 | return br_stack->nr * br_entry_size; | |
1697 | ||
1698 | if (!buf || (size % br_entry_size != 0)) | |
1699 | return -EINVAL; | |
1700 | ||
1701 | to_copy = min_t(u32, br_stack->nr * br_entry_size, size); | |
1702 | memcpy(buf, br_stack->entries, to_copy); | |
1703 | ||
1704 | return to_copy; | |
fff7b643 DX |
1705 | } |
1706 | ||
1707 | static const struct bpf_func_proto bpf_read_branch_records_proto = { | |
1708 | .func = bpf_read_branch_records, | |
1709 | .gpl_only = true, | |
1710 | .ret_type = RET_INTEGER, | |
1711 | .arg1_type = ARG_PTR_TO_CTX, | |
1712 | .arg2_type = ARG_PTR_TO_MEM_OR_NULL, | |
1713 | .arg3_type = ARG_CONST_SIZE_OR_ZERO, | |
1714 | .arg4_type = ARG_ANYTHING, | |
1715 | }; | |
1716 | ||
5e43f899 AI |
1717 | static const struct bpf_func_proto * |
1718 | pe_prog_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) | |
9fd82b61 AS |
1719 | { |
1720 | switch (func_id) { | |
1721 | case BPF_FUNC_perf_event_output: | |
9940d67c | 1722 | return &bpf_perf_event_output_proto_tp; |
9fd82b61 | 1723 | case BPF_FUNC_get_stackid: |
7b04d6d6 | 1724 | return &bpf_get_stackid_proto_pe; |
c195651e | 1725 | case BPF_FUNC_get_stack: |
7b04d6d6 | 1726 | return &bpf_get_stack_proto_pe; |
4bebdc7a | 1727 | case BPF_FUNC_perf_prog_read_value: |
f005afed | 1728 | return &bpf_perf_prog_read_value_proto; |
fff7b643 DX |
1729 | case BPF_FUNC_read_branch_records: |
1730 | return &bpf_read_branch_records_proto; | |
7adfc6c9 AN |
1731 | case BPF_FUNC_get_attach_cookie: |
1732 | return &bpf_get_attach_cookie_proto_pe; | |
9fd82b61 | 1733 | default: |
fc611f47 | 1734 | return bpf_tracing_func_proto(func_id, prog); |
9fd82b61 AS |
1735 | } |
1736 | } | |
1737 | ||
c4f6699d AS |
1738 | /* |
1739 | * bpf_raw_tp_regs are separate from bpf_pt_regs used from skb/xdp | |
1740 | * to avoid potential recursive reuse issue when/if tracepoints are added | |
9594dc3c MM |
1741 | * inside bpf_*_event_output, bpf_get_stackid and/or bpf_get_stack. |
1742 | * | |
1743 | * Since raw tracepoints run despite bpf_prog_active, support concurrent usage | |
1744 | * in normal, irq, and nmi context. | |
c4f6699d | 1745 | */ |
9594dc3c MM |
1746 | struct bpf_raw_tp_regs { |
1747 | struct pt_regs regs[3]; | |
1748 | }; | |
1749 | static DEFINE_PER_CPU(struct bpf_raw_tp_regs, bpf_raw_tp_regs); | |
1750 | static DEFINE_PER_CPU(int, bpf_raw_tp_nest_level); | |
1751 | static struct pt_regs *get_bpf_raw_tp_regs(void) | |
1752 | { | |
1753 | struct bpf_raw_tp_regs *tp_regs = this_cpu_ptr(&bpf_raw_tp_regs); | |
1754 | int nest_level = this_cpu_inc_return(bpf_raw_tp_nest_level); | |
1755 | ||
3880cdbe | 1756 | if (nest_level > ARRAY_SIZE(tp_regs->regs)) { |
9594dc3c MM |
1757 | this_cpu_dec(bpf_raw_tp_nest_level); |
1758 | return ERR_PTR(-EBUSY); | |
1759 | } | |
1760 | ||
1761 | return &tp_regs->regs[nest_level - 1]; | |
1762 | } | |
1763 | ||
1764 | static void put_bpf_raw_tp_regs(void) | |
1765 | { | |
1766 | this_cpu_dec(bpf_raw_tp_nest_level); | |
1767 | } | |
1768 | ||
c4f6699d AS |
1769 | BPF_CALL_5(bpf_perf_event_output_raw_tp, struct bpf_raw_tracepoint_args *, args, |
1770 | struct bpf_map *, map, u64, flags, void *, data, u64, size) | |
1771 | { | |
9594dc3c MM |
1772 | struct pt_regs *regs = get_bpf_raw_tp_regs(); |
1773 | int ret; | |
1774 | ||
1775 | if (IS_ERR(regs)) | |
1776 | return PTR_ERR(regs); | |
c4f6699d AS |
1777 | |
1778 | perf_fetch_caller_regs(regs); | |
9594dc3c MM |
1779 | ret = ____bpf_perf_event_output(regs, map, flags, data, size); |
1780 | ||
1781 | put_bpf_raw_tp_regs(); | |
1782 | return ret; | |
c4f6699d AS |
1783 | } |
1784 | ||
1785 | static const struct bpf_func_proto bpf_perf_event_output_proto_raw_tp = { | |
1786 | .func = bpf_perf_event_output_raw_tp, | |
1787 | .gpl_only = true, | |
1788 | .ret_type = RET_INTEGER, | |
1789 | .arg1_type = ARG_PTR_TO_CTX, | |
1790 | .arg2_type = ARG_CONST_MAP_PTR, | |
1791 | .arg3_type = ARG_ANYTHING, | |
216e3cd2 | 1792 | .arg4_type = ARG_PTR_TO_MEM | MEM_RDONLY, |
c4f6699d AS |
1793 | .arg5_type = ARG_CONST_SIZE_OR_ZERO, |
1794 | }; | |
1795 | ||
a7658e1a | 1796 | extern const struct bpf_func_proto bpf_skb_output_proto; |
d831ee84 | 1797 | extern const struct bpf_func_proto bpf_xdp_output_proto; |
d9917302 | 1798 | extern const struct bpf_func_proto bpf_xdp_get_buff_len_trace_proto; |
a7658e1a | 1799 | |
c4f6699d AS |
1800 | BPF_CALL_3(bpf_get_stackid_raw_tp, struct bpf_raw_tracepoint_args *, args, |
1801 | struct bpf_map *, map, u64, flags) | |
1802 | { | |
9594dc3c MM |
1803 | struct pt_regs *regs = get_bpf_raw_tp_regs(); |
1804 | int ret; | |
1805 | ||
1806 | if (IS_ERR(regs)) | |
1807 | return PTR_ERR(regs); | |
c4f6699d AS |
1808 | |
1809 | perf_fetch_caller_regs(regs); | |
1810 | /* similar to bpf_perf_event_output_tp, but pt_regs fetched differently */ | |
9594dc3c MM |
1811 | ret = bpf_get_stackid((unsigned long) regs, (unsigned long) map, |
1812 | flags, 0, 0); | |
1813 | put_bpf_raw_tp_regs(); | |
1814 | return ret; | |
c4f6699d AS |
1815 | } |
1816 | ||
1817 | static const struct bpf_func_proto bpf_get_stackid_proto_raw_tp = { | |
1818 | .func = bpf_get_stackid_raw_tp, | |
1819 | .gpl_only = true, | |
1820 | .ret_type = RET_INTEGER, | |
1821 | .arg1_type = ARG_PTR_TO_CTX, | |
1822 | .arg2_type = ARG_CONST_MAP_PTR, | |
1823 | .arg3_type = ARG_ANYTHING, | |
1824 | }; | |
1825 | ||
c195651e YS |
1826 | BPF_CALL_4(bpf_get_stack_raw_tp, struct bpf_raw_tracepoint_args *, args, |
1827 | void *, buf, u32, size, u64, flags) | |
1828 | { | |
9594dc3c MM |
1829 | struct pt_regs *regs = get_bpf_raw_tp_regs(); |
1830 | int ret; | |
1831 | ||
1832 | if (IS_ERR(regs)) | |
1833 | return PTR_ERR(regs); | |
c195651e YS |
1834 | |
1835 | perf_fetch_caller_regs(regs); | |
9594dc3c MM |
1836 | ret = bpf_get_stack((unsigned long) regs, (unsigned long) buf, |
1837 | (unsigned long) size, flags, 0); | |
1838 | put_bpf_raw_tp_regs(); | |
1839 | return ret; | |
c195651e YS |
1840 | } |
1841 | ||
1842 | static const struct bpf_func_proto bpf_get_stack_proto_raw_tp = { | |
1843 | .func = bpf_get_stack_raw_tp, | |
1844 | .gpl_only = true, | |
1845 | .ret_type = RET_INTEGER, | |
1846 | .arg1_type = ARG_PTR_TO_CTX, | |
216e3cd2 | 1847 | .arg2_type = ARG_PTR_TO_MEM | MEM_RDONLY, |
c195651e YS |
1848 | .arg3_type = ARG_CONST_SIZE_OR_ZERO, |
1849 | .arg4_type = ARG_ANYTHING, | |
1850 | }; | |
1851 | ||
5e43f899 AI |
1852 | static const struct bpf_func_proto * |
1853 | raw_tp_prog_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) | |
c4f6699d AS |
1854 | { |
1855 | switch (func_id) { | |
1856 | case BPF_FUNC_perf_event_output: | |
1857 | return &bpf_perf_event_output_proto_raw_tp; | |
1858 | case BPF_FUNC_get_stackid: | |
1859 | return &bpf_get_stackid_proto_raw_tp; | |
c195651e YS |
1860 | case BPF_FUNC_get_stack: |
1861 | return &bpf_get_stack_proto_raw_tp; | |
68ca5d4e AN |
1862 | case BPF_FUNC_get_attach_cookie: |
1863 | return &bpf_get_attach_cookie_proto_tracing; | |
c4f6699d | 1864 | default: |
fc611f47 | 1865 | return bpf_tracing_func_proto(func_id, prog); |
c4f6699d AS |
1866 | } |
1867 | } | |
1868 | ||
958a3f2d | 1869 | const struct bpf_func_proto * |
f1b9509c AS |
1870 | tracing_prog_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) |
1871 | { | |
3cee6fb8 MKL |
1872 | const struct bpf_func_proto *fn; |
1873 | ||
f1b9509c AS |
1874 | switch (func_id) { |
1875 | #ifdef CONFIG_NET | |
1876 | case BPF_FUNC_skb_output: | |
1877 | return &bpf_skb_output_proto; | |
d831ee84 EC |
1878 | case BPF_FUNC_xdp_output: |
1879 | return &bpf_xdp_output_proto; | |
af7ec138 YS |
1880 | case BPF_FUNC_skc_to_tcp6_sock: |
1881 | return &bpf_skc_to_tcp6_sock_proto; | |
478cfbdf YS |
1882 | case BPF_FUNC_skc_to_tcp_sock: |
1883 | return &bpf_skc_to_tcp_sock_proto; | |
1884 | case BPF_FUNC_skc_to_tcp_timewait_sock: | |
1885 | return &bpf_skc_to_tcp_timewait_sock_proto; | |
1886 | case BPF_FUNC_skc_to_tcp_request_sock: | |
1887 | return &bpf_skc_to_tcp_request_sock_proto; | |
0d4fad3e YS |
1888 | case BPF_FUNC_skc_to_udp6_sock: |
1889 | return &bpf_skc_to_udp6_sock_proto; | |
9eeb3aa3 HC |
1890 | case BPF_FUNC_skc_to_unix_sock: |
1891 | return &bpf_skc_to_unix_sock_proto; | |
3bc253c2 GT |
1892 | case BPF_FUNC_skc_to_mptcp_sock: |
1893 | return &bpf_skc_to_mptcp_sock_proto; | |
8e4597c6 MKL |
1894 | case BPF_FUNC_sk_storage_get: |
1895 | return &bpf_sk_storage_get_tracing_proto; | |
1896 | case BPF_FUNC_sk_storage_delete: | |
1897 | return &bpf_sk_storage_delete_tracing_proto; | |
b60da495 FR |
1898 | case BPF_FUNC_sock_from_file: |
1899 | return &bpf_sock_from_file_proto; | |
c5dbb89f FR |
1900 | case BPF_FUNC_get_socket_cookie: |
1901 | return &bpf_get_socket_ptr_cookie_proto; | |
d9917302 EC |
1902 | case BPF_FUNC_xdp_get_buff_len: |
1903 | return &bpf_xdp_get_buff_len_trace_proto; | |
f1b9509c | 1904 | #endif |
492e639f YS |
1905 | case BPF_FUNC_seq_printf: |
1906 | return prog->expected_attach_type == BPF_TRACE_ITER ? | |
1907 | &bpf_seq_printf_proto : | |
1908 | NULL; | |
1909 | case BPF_FUNC_seq_write: | |
1910 | return prog->expected_attach_type == BPF_TRACE_ITER ? | |
1911 | &bpf_seq_write_proto : | |
1912 | NULL; | |
eb411377 AM |
1913 | case BPF_FUNC_seq_printf_btf: |
1914 | return prog->expected_attach_type == BPF_TRACE_ITER ? | |
1915 | &bpf_seq_printf_btf_proto : | |
1916 | NULL; | |
6e22ab9d JO |
1917 | case BPF_FUNC_d_path: |
1918 | return &bpf_d_path_proto; | |
f92c1e18 JO |
1919 | case BPF_FUNC_get_func_arg: |
1920 | return bpf_prog_has_trampoline(prog) ? &bpf_get_func_arg_proto : NULL; | |
1921 | case BPF_FUNC_get_func_ret: | |
1922 | return bpf_prog_has_trampoline(prog) ? &bpf_get_func_ret_proto : NULL; | |
1923 | case BPF_FUNC_get_func_arg_cnt: | |
1924 | return bpf_prog_has_trampoline(prog) ? &bpf_get_func_arg_cnt_proto : NULL; | |
2fcc8241 | 1925 | case BPF_FUNC_get_attach_cookie: |
68ca5d4e AN |
1926 | if (prog->type == BPF_PROG_TYPE_TRACING && |
1927 | prog->expected_attach_type == BPF_TRACE_RAW_TP) | |
1928 | return &bpf_get_attach_cookie_proto_tracing; | |
2fcc8241 | 1929 | return bpf_prog_has_trampoline(prog) ? &bpf_get_attach_cookie_proto_tracing : NULL; |
f1b9509c | 1930 | default: |
3cee6fb8 MKL |
1931 | fn = raw_tp_prog_func_proto(func_id, prog); |
1932 | if (!fn && prog->expected_attach_type == BPF_TRACE_ITER) | |
1933 | fn = bpf_iter_get_func_proto(func_id, prog); | |
1934 | return fn; | |
f1b9509c AS |
1935 | } |
1936 | } | |
1937 | ||
c4f6699d AS |
1938 | static bool raw_tp_prog_is_valid_access(int off, int size, |
1939 | enum bpf_access_type type, | |
5e43f899 | 1940 | const struct bpf_prog *prog, |
c4f6699d AS |
1941 | struct bpf_insn_access_aux *info) |
1942 | { | |
35346ab6 | 1943 | return bpf_tracing_ctx_access(off, size, type); |
f1b9509c AS |
1944 | } |
1945 | ||
1946 | static bool tracing_prog_is_valid_access(int off, int size, | |
1947 | enum bpf_access_type type, | |
1948 | const struct bpf_prog *prog, | |
1949 | struct bpf_insn_access_aux *info) | |
1950 | { | |
35346ab6 | 1951 | return bpf_tracing_btf_ctx_access(off, size, type, prog, info); |
c4f6699d AS |
1952 | } |
1953 | ||
3e7c67d9 KS |
1954 | int __weak bpf_prog_test_run_tracing(struct bpf_prog *prog, |
1955 | const union bpf_attr *kattr, | |
1956 | union bpf_attr __user *uattr) | |
1957 | { | |
1958 | return -ENOTSUPP; | |
1959 | } | |
1960 | ||
c4f6699d AS |
1961 | const struct bpf_verifier_ops raw_tracepoint_verifier_ops = { |
1962 | .get_func_proto = raw_tp_prog_func_proto, | |
1963 | .is_valid_access = raw_tp_prog_is_valid_access, | |
1964 | }; | |
1965 | ||
1966 | const struct bpf_prog_ops raw_tracepoint_prog_ops = { | |
ebfb4d40 | 1967 | #ifdef CONFIG_NET |
1b4d60ec | 1968 | .test_run = bpf_prog_test_run_raw_tp, |
ebfb4d40 | 1969 | #endif |
c4f6699d AS |
1970 | }; |
1971 | ||
f1b9509c AS |
1972 | const struct bpf_verifier_ops tracing_verifier_ops = { |
1973 | .get_func_proto = tracing_prog_func_proto, | |
1974 | .is_valid_access = tracing_prog_is_valid_access, | |
1975 | }; | |
1976 | ||
1977 | const struct bpf_prog_ops tracing_prog_ops = { | |
da00d2f1 | 1978 | .test_run = bpf_prog_test_run_tracing, |
f1b9509c AS |
1979 | }; |
1980 | ||
9df1c28b MM |
1981 | static bool raw_tp_writable_prog_is_valid_access(int off, int size, |
1982 | enum bpf_access_type type, | |
1983 | const struct bpf_prog *prog, | |
1984 | struct bpf_insn_access_aux *info) | |
1985 | { | |
1986 | if (off == 0) { | |
1987 | if (size != sizeof(u64) || type != BPF_READ) | |
1988 | return false; | |
1989 | info->reg_type = PTR_TO_TP_BUFFER; | |
1990 | } | |
1991 | return raw_tp_prog_is_valid_access(off, size, type, prog, info); | |
1992 | } | |
1993 | ||
1994 | const struct bpf_verifier_ops raw_tracepoint_writable_verifier_ops = { | |
1995 | .get_func_proto = raw_tp_prog_func_proto, | |
1996 | .is_valid_access = raw_tp_writable_prog_is_valid_access, | |
1997 | }; | |
1998 | ||
1999 | const struct bpf_prog_ops raw_tracepoint_writable_prog_ops = { | |
2000 | }; | |
2001 | ||
0515e599 | 2002 | static bool pe_prog_is_valid_access(int off, int size, enum bpf_access_type type, |
5e43f899 | 2003 | const struct bpf_prog *prog, |
23994631 | 2004 | struct bpf_insn_access_aux *info) |
0515e599 | 2005 | { |
95da0cdb | 2006 | const int size_u64 = sizeof(u64); |
31fd8581 | 2007 | |
0515e599 AS |
2008 | if (off < 0 || off >= sizeof(struct bpf_perf_event_data)) |
2009 | return false; | |
2010 | if (type != BPF_READ) | |
2011 | return false; | |
bc23105c DB |
2012 | if (off % size != 0) { |
2013 | if (sizeof(unsigned long) != 4) | |
2014 | return false; | |
2015 | if (size != 8) | |
2016 | return false; | |
2017 | if (off % size != 4) | |
2018 | return false; | |
2019 | } | |
31fd8581 | 2020 | |
f96da094 DB |
2021 | switch (off) { |
2022 | case bpf_ctx_range(struct bpf_perf_event_data, sample_period): | |
95da0cdb TQ |
2023 | bpf_ctx_record_field_size(info, size_u64); |
2024 | if (!bpf_ctx_narrow_access_ok(off, size, size_u64)) | |
2025 | return false; | |
2026 | break; | |
2027 | case bpf_ctx_range(struct bpf_perf_event_data, addr): | |
2028 | bpf_ctx_record_field_size(info, size_u64); | |
2029 | if (!bpf_ctx_narrow_access_ok(off, size, size_u64)) | |
23994631 | 2030 | return false; |
f96da094 DB |
2031 | break; |
2032 | default: | |
0515e599 AS |
2033 | if (size != sizeof(long)) |
2034 | return false; | |
2035 | } | |
f96da094 | 2036 | |
0515e599 AS |
2037 | return true; |
2038 | } | |
2039 | ||
6b8cc1d1 DB |
2040 | static u32 pe_prog_convert_ctx_access(enum bpf_access_type type, |
2041 | const struct bpf_insn *si, | |
0515e599 | 2042 | struct bpf_insn *insn_buf, |
f96da094 | 2043 | struct bpf_prog *prog, u32 *target_size) |
0515e599 AS |
2044 | { |
2045 | struct bpf_insn *insn = insn_buf; | |
2046 | ||
6b8cc1d1 | 2047 | switch (si->off) { |
0515e599 | 2048 | case offsetof(struct bpf_perf_event_data, sample_period): |
f035a515 | 2049 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct bpf_perf_event_data_kern, |
6b8cc1d1 | 2050 | data), si->dst_reg, si->src_reg, |
0515e599 | 2051 | offsetof(struct bpf_perf_event_data_kern, data)); |
6b8cc1d1 | 2052 | *insn++ = BPF_LDX_MEM(BPF_DW, si->dst_reg, si->dst_reg, |
f96da094 DB |
2053 | bpf_target_off(struct perf_sample_data, period, 8, |
2054 | target_size)); | |
0515e599 | 2055 | break; |
95da0cdb TQ |
2056 | case offsetof(struct bpf_perf_event_data, addr): |
2057 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct bpf_perf_event_data_kern, | |
2058 | data), si->dst_reg, si->src_reg, | |
2059 | offsetof(struct bpf_perf_event_data_kern, data)); | |
2060 | *insn++ = BPF_LDX_MEM(BPF_DW, si->dst_reg, si->dst_reg, | |
2061 | bpf_target_off(struct perf_sample_data, addr, 8, | |
2062 | target_size)); | |
2063 | break; | |
0515e599 | 2064 | default: |
f035a515 | 2065 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct bpf_perf_event_data_kern, |
6b8cc1d1 | 2066 | regs), si->dst_reg, si->src_reg, |
0515e599 | 2067 | offsetof(struct bpf_perf_event_data_kern, regs)); |
6b8cc1d1 DB |
2068 | *insn++ = BPF_LDX_MEM(BPF_SIZEOF(long), si->dst_reg, si->dst_reg, |
2069 | si->off); | |
0515e599 AS |
2070 | break; |
2071 | } | |
2072 | ||
2073 | return insn - insn_buf; | |
2074 | } | |
2075 | ||
7de16e3a | 2076 | const struct bpf_verifier_ops perf_event_verifier_ops = { |
f005afed | 2077 | .get_func_proto = pe_prog_func_proto, |
0515e599 AS |
2078 | .is_valid_access = pe_prog_is_valid_access, |
2079 | .convert_ctx_access = pe_prog_convert_ctx_access, | |
2080 | }; | |
7de16e3a JK |
2081 | |
2082 | const struct bpf_prog_ops perf_event_prog_ops = { | |
2083 | }; | |
e87c6bc3 YS |
2084 | |
2085 | static DEFINE_MUTEX(bpf_event_mutex); | |
2086 | ||
c8c088ba YS |
2087 | #define BPF_TRACE_MAX_PROGS 64 |
2088 | ||
e87c6bc3 | 2089 | int perf_event_attach_bpf_prog(struct perf_event *event, |
82e6b1ee AN |
2090 | struct bpf_prog *prog, |
2091 | u64 bpf_cookie) | |
e87c6bc3 | 2092 | { |
e672db03 | 2093 | struct bpf_prog_array *old_array; |
e87c6bc3 YS |
2094 | struct bpf_prog_array *new_array; |
2095 | int ret = -EEXIST; | |
2096 | ||
9802d865 | 2097 | /* |
b4da3340 MH |
2098 | * Kprobe override only works if they are on the function entry, |
2099 | * and only if they are on the opt-in list. | |
9802d865 JB |
2100 | */ |
2101 | if (prog->kprobe_override && | |
b4da3340 | 2102 | (!trace_kprobe_on_func_entry(event->tp_event) || |
9802d865 JB |
2103 | !trace_kprobe_error_injectable(event->tp_event))) |
2104 | return -EINVAL; | |
2105 | ||
e87c6bc3 YS |
2106 | mutex_lock(&bpf_event_mutex); |
2107 | ||
2108 | if (event->prog) | |
07c41a29 | 2109 | goto unlock; |
e87c6bc3 | 2110 | |
e672db03 | 2111 | old_array = bpf_event_rcu_dereference(event->tp_event->prog_array); |
c8c088ba YS |
2112 | if (old_array && |
2113 | bpf_prog_array_length(old_array) >= BPF_TRACE_MAX_PROGS) { | |
2114 | ret = -E2BIG; | |
2115 | goto unlock; | |
2116 | } | |
2117 | ||
82e6b1ee | 2118 | ret = bpf_prog_array_copy(old_array, NULL, prog, bpf_cookie, &new_array); |
e87c6bc3 | 2119 | if (ret < 0) |
07c41a29 | 2120 | goto unlock; |
e87c6bc3 YS |
2121 | |
2122 | /* set the new array to event->tp_event and set event->prog */ | |
2123 | event->prog = prog; | |
82e6b1ee | 2124 | event->bpf_cookie = bpf_cookie; |
e87c6bc3 | 2125 | rcu_assign_pointer(event->tp_event->prog_array, new_array); |
8c7dcb84 | 2126 | bpf_prog_array_free_sleepable(old_array); |
e87c6bc3 | 2127 | |
07c41a29 | 2128 | unlock: |
e87c6bc3 YS |
2129 | mutex_unlock(&bpf_event_mutex); |
2130 | return ret; | |
2131 | } | |
2132 | ||
2133 | void perf_event_detach_bpf_prog(struct perf_event *event) | |
2134 | { | |
e672db03 | 2135 | struct bpf_prog_array *old_array; |
e87c6bc3 | 2136 | struct bpf_prog_array *new_array; |
ca3c4f64 | 2137 | struct bpf_prog *prog = NULL; |
e87c6bc3 YS |
2138 | int ret; |
2139 | ||
2140 | mutex_lock(&bpf_event_mutex); | |
2141 | ||
2142 | if (!event->prog) | |
07c41a29 | 2143 | goto unlock; |
e87c6bc3 | 2144 | |
e672db03 | 2145 | old_array = bpf_event_rcu_dereference(event->tp_event->prog_array); |
978c4486 JO |
2146 | if (!old_array) |
2147 | goto put; | |
2148 | ||
82e6b1ee | 2149 | ret = bpf_prog_array_copy(old_array, event->prog, NULL, 0, &new_array); |
e87c6bc3 YS |
2150 | if (ret < 0) { |
2151 | bpf_prog_array_delete_safe(old_array, event->prog); | |
2152 | } else { | |
2153 | rcu_assign_pointer(event->tp_event->prog_array, new_array); | |
8c7dcb84 | 2154 | bpf_prog_array_free_sleepable(old_array); |
e87c6bc3 YS |
2155 | } |
2156 | ||
978c4486 | 2157 | put: |
ca3c4f64 | 2158 | prog = event->prog; |
e87c6bc3 YS |
2159 | event->prog = NULL; |
2160 | ||
07c41a29 | 2161 | unlock: |
e87c6bc3 | 2162 | mutex_unlock(&bpf_event_mutex); |
ca3c4f64 PL |
2163 | |
2164 | if (prog) { | |
2165 | /* | |
2166 | * It could be that the bpf_prog is not sleepable (and will be freed | |
2167 | * via normal RCU), but is called from a point that supports sleepable | |
2168 | * programs and uses tasks-trace-RCU. | |
2169 | */ | |
2170 | synchronize_rcu_tasks_trace(); | |
2171 | ||
2172 | bpf_prog_put(prog); | |
2173 | } | |
e87c6bc3 | 2174 | } |
f371b304 | 2175 | |
f4e2298e | 2176 | int perf_event_query_prog_array(struct perf_event *event, void __user *info) |
f371b304 YS |
2177 | { |
2178 | struct perf_event_query_bpf __user *uquery = info; | |
2179 | struct perf_event_query_bpf query = {}; | |
e672db03 | 2180 | struct bpf_prog_array *progs; |
3a38bb98 | 2181 | u32 *ids, prog_cnt, ids_len; |
f371b304 YS |
2182 | int ret; |
2183 | ||
031258da | 2184 | if (!perfmon_capable()) |
f371b304 YS |
2185 | return -EPERM; |
2186 | if (event->attr.type != PERF_TYPE_TRACEPOINT) | |
2187 | return -EINVAL; | |
2188 | if (copy_from_user(&query, uquery, sizeof(query))) | |
2189 | return -EFAULT; | |
3a38bb98 YS |
2190 | |
2191 | ids_len = query.ids_len; | |
2192 | if (ids_len > BPF_TRACE_MAX_PROGS) | |
9c481b90 | 2193 | return -E2BIG; |
3a38bb98 YS |
2194 | ids = kcalloc(ids_len, sizeof(u32), GFP_USER | __GFP_NOWARN); |
2195 | if (!ids) | |
2196 | return -ENOMEM; | |
2197 | /* | |
2198 | * The above kcalloc returns ZERO_SIZE_PTR when ids_len = 0, which | |
2199 | * is required when user only wants to check for uquery->prog_cnt. | |
2200 | * There is no need to check for it since the case is handled | |
2201 | * gracefully in bpf_prog_array_copy_info. | |
2202 | */ | |
f371b304 YS |
2203 | |
2204 | mutex_lock(&bpf_event_mutex); | |
e672db03 SF |
2205 | progs = bpf_event_rcu_dereference(event->tp_event->prog_array); |
2206 | ret = bpf_prog_array_copy_info(progs, ids, ids_len, &prog_cnt); | |
f371b304 YS |
2207 | mutex_unlock(&bpf_event_mutex); |
2208 | ||
3a38bb98 YS |
2209 | if (copy_to_user(&uquery->prog_cnt, &prog_cnt, sizeof(prog_cnt)) || |
2210 | copy_to_user(uquery->ids, ids, ids_len * sizeof(u32))) | |
2211 | ret = -EFAULT; | |
2212 | ||
2213 | kfree(ids); | |
f371b304 YS |
2214 | return ret; |
2215 | } | |
c4f6699d AS |
2216 | |
2217 | extern struct bpf_raw_event_map __start__bpf_raw_tp[]; | |
2218 | extern struct bpf_raw_event_map __stop__bpf_raw_tp[]; | |
2219 | ||
a38d1107 | 2220 | struct bpf_raw_event_map *bpf_get_raw_tracepoint(const char *name) |
c4f6699d AS |
2221 | { |
2222 | struct bpf_raw_event_map *btp = __start__bpf_raw_tp; | |
2223 | ||
2224 | for (; btp < __stop__bpf_raw_tp; btp++) { | |
2225 | if (!strcmp(btp->tp->name, name)) | |
2226 | return btp; | |
2227 | } | |
a38d1107 MM |
2228 | |
2229 | return bpf_get_raw_tracepoint_module(name); | |
2230 | } | |
2231 | ||
2232 | void bpf_put_raw_tracepoint(struct bpf_raw_event_map *btp) | |
2233 | { | |
12cc126d | 2234 | struct module *mod; |
a38d1107 | 2235 | |
8c6eb7ca | 2236 | guard(rcu)(); |
12cc126d AN |
2237 | mod = __module_address((unsigned long)btp); |
2238 | module_put(mod); | |
c4f6699d AS |
2239 | } |
2240 | ||
2241 | static __always_inline | |
d4dfc570 | 2242 | void __bpf_trace_run(struct bpf_raw_tp_link *link, u64 *args) |
c4f6699d | 2243 | { |
d4dfc570 | 2244 | struct bpf_prog *prog = link->link.prog; |
68ca5d4e AN |
2245 | struct bpf_run_ctx *old_run_ctx; |
2246 | struct bpf_trace_run_ctx run_ctx; | |
d4dfc570 | 2247 | |
f03efe49 | 2248 | cant_sleep(); |
05b24ff9 JO |
2249 | if (unlikely(this_cpu_inc_return(*(prog->active)) != 1)) { |
2250 | bpf_prog_inc_misses_counter(prog); | |
2251 | goto out; | |
2252 | } | |
68ca5d4e AN |
2253 | |
2254 | run_ctx.bpf_cookie = link->cookie; | |
2255 | old_run_ctx = bpf_set_run_ctx(&run_ctx.run_ctx); | |
2256 | ||
c4f6699d | 2257 | rcu_read_lock(); |
fb7dd8bc | 2258 | (void) bpf_prog_run(prog, args); |
c4f6699d | 2259 | rcu_read_unlock(); |
68ca5d4e AN |
2260 | |
2261 | bpf_reset_run_ctx(old_run_ctx); | |
05b24ff9 JO |
2262 | out: |
2263 | this_cpu_dec(*(prog->active)); | |
c4f6699d AS |
2264 | } |
2265 | ||
2266 | #define UNPACK(...) __VA_ARGS__ | |
2267 | #define REPEAT_1(FN, DL, X, ...) FN(X) | |
2268 | #define REPEAT_2(FN, DL, X, ...) FN(X) UNPACK DL REPEAT_1(FN, DL, __VA_ARGS__) | |
2269 | #define REPEAT_3(FN, DL, X, ...) FN(X) UNPACK DL REPEAT_2(FN, DL, __VA_ARGS__) | |
2270 | #define REPEAT_4(FN, DL, X, ...) FN(X) UNPACK DL REPEAT_3(FN, DL, __VA_ARGS__) | |
2271 | #define REPEAT_5(FN, DL, X, ...) FN(X) UNPACK DL REPEAT_4(FN, DL, __VA_ARGS__) | |
2272 | #define REPEAT_6(FN, DL, X, ...) FN(X) UNPACK DL REPEAT_5(FN, DL, __VA_ARGS__) | |
2273 | #define REPEAT_7(FN, DL, X, ...) FN(X) UNPACK DL REPEAT_6(FN, DL, __VA_ARGS__) | |
2274 | #define REPEAT_8(FN, DL, X, ...) FN(X) UNPACK DL REPEAT_7(FN, DL, __VA_ARGS__) | |
2275 | #define REPEAT_9(FN, DL, X, ...) FN(X) UNPACK DL REPEAT_8(FN, DL, __VA_ARGS__) | |
2276 | #define REPEAT_10(FN, DL, X, ...) FN(X) UNPACK DL REPEAT_9(FN, DL, __VA_ARGS__) | |
2277 | #define REPEAT_11(FN, DL, X, ...) FN(X) UNPACK DL REPEAT_10(FN, DL, __VA_ARGS__) | |
2278 | #define REPEAT_12(FN, DL, X, ...) FN(X) UNPACK DL REPEAT_11(FN, DL, __VA_ARGS__) | |
2279 | #define REPEAT(X, FN, DL, ...) REPEAT_##X(FN, DL, __VA_ARGS__) | |
2280 | ||
2281 | #define SARG(X) u64 arg##X | |
2282 | #define COPY(X) args[X] = arg##X | |
2283 | ||
2284 | #define __DL_COM (,) | |
2285 | #define __DL_SEM (;) | |
2286 | ||
2287 | #define __SEQ_0_11 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 | |
2288 | ||
2289 | #define BPF_TRACE_DEFN_x(x) \ | |
d4dfc570 | 2290 | void bpf_trace_run##x(struct bpf_raw_tp_link *link, \ |
c4f6699d AS |
2291 | REPEAT(x, SARG, __DL_COM, __SEQ_0_11)) \ |
2292 | { \ | |
2293 | u64 args[x]; \ | |
2294 | REPEAT(x, COPY, __DL_SEM, __SEQ_0_11); \ | |
d4dfc570 | 2295 | __bpf_trace_run(link, args); \ |
c4f6699d AS |
2296 | } \ |
2297 | EXPORT_SYMBOL_GPL(bpf_trace_run##x) | |
2298 | BPF_TRACE_DEFN_x(1); | |
2299 | BPF_TRACE_DEFN_x(2); | |
2300 | BPF_TRACE_DEFN_x(3); | |
2301 | BPF_TRACE_DEFN_x(4); | |
2302 | BPF_TRACE_DEFN_x(5); | |
2303 | BPF_TRACE_DEFN_x(6); | |
2304 | BPF_TRACE_DEFN_x(7); | |
2305 | BPF_TRACE_DEFN_x(8); | |
2306 | BPF_TRACE_DEFN_x(9); | |
2307 | BPF_TRACE_DEFN_x(10); | |
2308 | BPF_TRACE_DEFN_x(11); | |
2309 | BPF_TRACE_DEFN_x(12); | |
2310 | ||
d4dfc570 | 2311 | int bpf_probe_register(struct bpf_raw_event_map *btp, struct bpf_raw_tp_link *link) |
c4f6699d AS |
2312 | { |
2313 | struct tracepoint *tp = btp->tp; | |
d4dfc570 | 2314 | struct bpf_prog *prog = link->link.prog; |
c4f6699d AS |
2315 | |
2316 | /* | |
2317 | * check that program doesn't access arguments beyond what's | |
2318 | * available in this tracepoint | |
2319 | */ | |
2320 | if (prog->aux->max_ctx_offset > btp->num_args * sizeof(u64)) | |
2321 | return -EINVAL; | |
2322 | ||
9df1c28b MM |
2323 | if (prog->aux->max_tp_access > btp->writable_size) |
2324 | return -EINVAL; | |
2325 | ||
d4dfc570 | 2326 | return tracepoint_probe_register_may_exist(tp, (void *)btp->bpf_func, link); |
c4f6699d AS |
2327 | } |
2328 | ||
d4dfc570 | 2329 | int bpf_probe_unregister(struct bpf_raw_event_map *btp, struct bpf_raw_tp_link *link) |
c4f6699d | 2330 | { |
d4dfc570 | 2331 | return tracepoint_probe_unregister(btp->tp, (void *)btp->bpf_func, link); |
c4f6699d | 2332 | } |
41bdc4b4 YS |
2333 | |
2334 | int bpf_get_perf_event_info(const struct perf_event *event, u32 *prog_id, | |
2335 | u32 *fd_type, const char **buf, | |
3acf8ace JO |
2336 | u64 *probe_offset, u64 *probe_addr, |
2337 | unsigned long *missed) | |
41bdc4b4 YS |
2338 | { |
2339 | bool is_tracepoint, is_syscall_tp; | |
2340 | struct bpf_prog *prog; | |
2341 | int flags, err = 0; | |
2342 | ||
2343 | prog = event->prog; | |
2344 | if (!prog) | |
2345 | return -ENOENT; | |
2346 | ||
2347 | /* not supporting BPF_PROG_TYPE_PERF_EVENT yet */ | |
2348 | if (prog->type == BPF_PROG_TYPE_PERF_EVENT) | |
2349 | return -EOPNOTSUPP; | |
2350 | ||
2351 | *prog_id = prog->aux->id; | |
2352 | flags = event->tp_event->flags; | |
2353 | is_tracepoint = flags & TRACE_EVENT_FL_TRACEPOINT; | |
2354 | is_syscall_tp = is_syscall_trace_event(event->tp_event); | |
2355 | ||
2356 | if (is_tracepoint || is_syscall_tp) { | |
2357 | *buf = is_tracepoint ? event->tp_event->tp->name | |
2358 | : event->tp_event->name; | |
1b715e1b YS |
2359 | /* We allow NULL pointer for tracepoint */ |
2360 | if (fd_type) | |
2361 | *fd_type = BPF_FD_TYPE_TRACEPOINT; | |
2362 | if (probe_offset) | |
2363 | *probe_offset = 0x0; | |
2364 | if (probe_addr) | |
2365 | *probe_addr = 0x0; | |
41bdc4b4 YS |
2366 | } else { |
2367 | /* kprobe/uprobe */ | |
2368 | err = -EOPNOTSUPP; | |
2369 | #ifdef CONFIG_KPROBE_EVENTS | |
2370 | if (flags & TRACE_EVENT_FL_KPROBE) | |
2371 | err = bpf_get_kprobe_info(event, fd_type, buf, | |
3acf8ace | 2372 | probe_offset, probe_addr, missed, |
41bdc4b4 YS |
2373 | event->attr.type == PERF_TYPE_TRACEPOINT); |
2374 | #endif | |
2375 | #ifdef CONFIG_UPROBE_EVENTS | |
2376 | if (flags & TRACE_EVENT_FL_UPROBE) | |
2377 | err = bpf_get_uprobe_info(event, fd_type, buf, | |
5125e757 | 2378 | probe_offset, probe_addr, |
41bdc4b4 YS |
2379 | event->attr.type == PERF_TYPE_TRACEPOINT); |
2380 | #endif | |
2381 | } | |
2382 | ||
2383 | return err; | |
2384 | } | |
a38d1107 | 2385 | |
9db1ff0a YS |
2386 | static int __init send_signal_irq_work_init(void) |
2387 | { | |
2388 | int cpu; | |
2389 | struct send_signal_irq_work *work; | |
2390 | ||
2391 | for_each_possible_cpu(cpu) { | |
2392 | work = per_cpu_ptr(&send_signal_work, cpu); | |
2393 | init_irq_work(&work->irq_work, do_bpf_send_signal); | |
2394 | } | |
2395 | return 0; | |
2396 | } | |
2397 | ||
2398 | subsys_initcall(send_signal_irq_work_init); | |
2399 | ||
a38d1107 | 2400 | #ifdef CONFIG_MODULES |
390e99cf SF |
2401 | static int bpf_event_notify(struct notifier_block *nb, unsigned long op, |
2402 | void *module) | |
a38d1107 MM |
2403 | { |
2404 | struct bpf_trace_module *btm, *tmp; | |
2405 | struct module *mod = module; | |
0340a6b7 | 2406 | int ret = 0; |
a38d1107 MM |
2407 | |
2408 | if (mod->num_bpf_raw_events == 0 || | |
2409 | (op != MODULE_STATE_COMING && op != MODULE_STATE_GOING)) | |
0340a6b7 | 2410 | goto out; |
a38d1107 MM |
2411 | |
2412 | mutex_lock(&bpf_module_mutex); | |
2413 | ||
2414 | switch (op) { | |
2415 | case MODULE_STATE_COMING: | |
2416 | btm = kzalloc(sizeof(*btm), GFP_KERNEL); | |
2417 | if (btm) { | |
2418 | btm->module = module; | |
2419 | list_add(&btm->list, &bpf_trace_modules); | |
0340a6b7 PZ |
2420 | } else { |
2421 | ret = -ENOMEM; | |
a38d1107 MM |
2422 | } |
2423 | break; | |
2424 | case MODULE_STATE_GOING: | |
2425 | list_for_each_entry_safe(btm, tmp, &bpf_trace_modules, list) { | |
2426 | if (btm->module == module) { | |
2427 | list_del(&btm->list); | |
2428 | kfree(btm); | |
2429 | break; | |
2430 | } | |
2431 | } | |
2432 | break; | |
2433 | } | |
2434 | ||
2435 | mutex_unlock(&bpf_module_mutex); | |
2436 | ||
0340a6b7 PZ |
2437 | out: |
2438 | return notifier_from_errno(ret); | |
a38d1107 MM |
2439 | } |
2440 | ||
2441 | static struct notifier_block bpf_module_nb = { | |
2442 | .notifier_call = bpf_event_notify, | |
2443 | }; | |
2444 | ||
390e99cf | 2445 | static int __init bpf_event_init(void) |
a38d1107 MM |
2446 | { |
2447 | register_module_notifier(&bpf_module_nb); | |
2448 | return 0; | |
2449 | } | |
2450 | ||
2451 | fs_initcall(bpf_event_init); | |
2452 | #endif /* CONFIG_MODULES */ | |
0dcac272 | 2453 | |
adf46d88 JO |
2454 | struct bpf_session_run_ctx { |
2455 | struct bpf_run_ctx run_ctx; | |
2456 | bool is_return; | |
5c919ace | 2457 | void *data; |
adf46d88 JO |
2458 | }; |
2459 | ||
0dcac272 JO |
2460 | #ifdef CONFIG_FPROBE |
2461 | struct bpf_kprobe_multi_link { | |
2462 | struct bpf_link link; | |
2463 | struct fprobe fp; | |
2464 | unsigned long *addrs; | |
ca74823c JO |
2465 | u64 *cookies; |
2466 | u32 cnt; | |
e22061b2 JO |
2467 | u32 mods_cnt; |
2468 | struct module **mods; | |
7ac8d0d2 | 2469 | u32 flags; |
0dcac272 JO |
2470 | }; |
2471 | ||
f7098690 | 2472 | struct bpf_kprobe_multi_run_ctx { |
adf46d88 | 2473 | struct bpf_session_run_ctx session_ctx; |
f7098690 JO |
2474 | struct bpf_kprobe_multi_link *link; |
2475 | unsigned long entry_ip; | |
2476 | }; | |
2477 | ||
0236fec5 JO |
2478 | struct user_syms { |
2479 | const char **syms; | |
2480 | char *buf; | |
2481 | }; | |
2482 | ||
8e2759da MHG |
2483 | #ifndef CONFIG_HAVE_FTRACE_REGS_HAVING_PT_REGS |
2484 | static DEFINE_PER_CPU(struct pt_regs, bpf_kprobe_multi_pt_regs); | |
2485 | #define bpf_kprobe_multi_pt_regs_ptr() this_cpu_ptr(&bpf_kprobe_multi_pt_regs) | |
2486 | #else | |
2487 | #define bpf_kprobe_multi_pt_regs_ptr() (NULL) | |
2488 | #endif | |
2489 | ||
4f7caaa2 MHG |
2490 | static unsigned long ftrace_get_entry_ip(unsigned long fentry_ip) |
2491 | { | |
2492 | unsigned long ip = ftrace_get_symaddr(fentry_ip); | |
2493 | ||
2494 | return ip ? : fentry_ip; | |
2495 | } | |
2496 | ||
0236fec5 JO |
2497 | static int copy_user_syms(struct user_syms *us, unsigned long __user *usyms, u32 cnt) |
2498 | { | |
2499 | unsigned long __user usymbol; | |
2500 | const char **syms = NULL; | |
2501 | char *buf = NULL, *p; | |
2502 | int err = -ENOMEM; | |
2503 | unsigned int i; | |
2504 | ||
fd58f7df | 2505 | syms = kvmalloc_array(cnt, sizeof(*syms), GFP_KERNEL); |
0236fec5 JO |
2506 | if (!syms) |
2507 | goto error; | |
2508 | ||
fd58f7df | 2509 | buf = kvmalloc_array(cnt, KSYM_NAME_LEN, GFP_KERNEL); |
0236fec5 JO |
2510 | if (!buf) |
2511 | goto error; | |
2512 | ||
2513 | for (p = buf, i = 0; i < cnt; i++) { | |
2514 | if (__get_user(usymbol, usyms + i)) { | |
2515 | err = -EFAULT; | |
2516 | goto error; | |
2517 | } | |
2518 | err = strncpy_from_user(p, (const char __user *) usymbol, KSYM_NAME_LEN); | |
2519 | if (err == KSYM_NAME_LEN) | |
2520 | err = -E2BIG; | |
2521 | if (err < 0) | |
2522 | goto error; | |
2523 | syms[i] = p; | |
2524 | p += err + 1; | |
2525 | } | |
2526 | ||
2527 | us->syms = syms; | |
2528 | us->buf = buf; | |
2529 | return 0; | |
2530 | ||
2531 | error: | |
2532 | if (err) { | |
2533 | kvfree(syms); | |
2534 | kvfree(buf); | |
2535 | } | |
2536 | return err; | |
2537 | } | |
2538 | ||
e22061b2 JO |
2539 | static void kprobe_multi_put_modules(struct module **mods, u32 cnt) |
2540 | { | |
2541 | u32 i; | |
2542 | ||
2543 | for (i = 0; i < cnt; i++) | |
2544 | module_put(mods[i]); | |
2545 | } | |
2546 | ||
0236fec5 JO |
2547 | static void free_user_syms(struct user_syms *us) |
2548 | { | |
2549 | kvfree(us->syms); | |
2550 | kvfree(us->buf); | |
2551 | } | |
2552 | ||
0dcac272 JO |
2553 | static void bpf_kprobe_multi_link_release(struct bpf_link *link) |
2554 | { | |
2555 | struct bpf_kprobe_multi_link *kmulti_link; | |
2556 | ||
2557 | kmulti_link = container_of(link, struct bpf_kprobe_multi_link, link); | |
2558 | unregister_fprobe(&kmulti_link->fp); | |
e22061b2 | 2559 | kprobe_multi_put_modules(kmulti_link->mods, kmulti_link->mods_cnt); |
0dcac272 JO |
2560 | } |
2561 | ||
2562 | static void bpf_kprobe_multi_link_dealloc(struct bpf_link *link) | |
2563 | { | |
2564 | struct bpf_kprobe_multi_link *kmulti_link; | |
2565 | ||
2566 | kmulti_link = container_of(link, struct bpf_kprobe_multi_link, link); | |
2567 | kvfree(kmulti_link->addrs); | |
ca74823c | 2568 | kvfree(kmulti_link->cookies); |
e22061b2 | 2569 | kfree(kmulti_link->mods); |
0dcac272 JO |
2570 | kfree(kmulti_link); |
2571 | } | |
2572 | ||
7ac8d0d2 YS |
2573 | static int bpf_kprobe_multi_link_fill_link_info(const struct bpf_link *link, |
2574 | struct bpf_link_info *info) | |
2575 | { | |
9fd112b1 | 2576 | u64 __user *ucookies = u64_to_user_ptr(info->kprobe_multi.cookies); |
7ac8d0d2 YS |
2577 | u64 __user *uaddrs = u64_to_user_ptr(info->kprobe_multi.addrs); |
2578 | struct bpf_kprobe_multi_link *kmulti_link; | |
2579 | u32 ucount = info->kprobe_multi.count; | |
2580 | int err = 0, i; | |
2581 | ||
2582 | if (!uaddrs ^ !ucount) | |
2583 | return -EINVAL; | |
9fd112b1 JO |
2584 | if (ucookies && !ucount) |
2585 | return -EINVAL; | |
7ac8d0d2 YS |
2586 | |
2587 | kmulti_link = container_of(link, struct bpf_kprobe_multi_link, link); | |
2588 | info->kprobe_multi.count = kmulti_link->cnt; | |
2589 | info->kprobe_multi.flags = kmulti_link->flags; | |
e2b2cd59 | 2590 | info->kprobe_multi.missed = kmulti_link->fp.nmissed; |
7ac8d0d2 YS |
2591 | |
2592 | if (!uaddrs) | |
2593 | return 0; | |
2594 | if (ucount < kmulti_link->cnt) | |
2595 | err = -ENOSPC; | |
2596 | else | |
2597 | ucount = kmulti_link->cnt; | |
2598 | ||
9fd112b1 JO |
2599 | if (ucookies) { |
2600 | if (kmulti_link->cookies) { | |
2601 | if (copy_to_user(ucookies, kmulti_link->cookies, ucount * sizeof(u64))) | |
2602 | return -EFAULT; | |
2603 | } else { | |
2604 | for (i = 0; i < ucount; i++) { | |
2605 | if (put_user(0, ucookies + i)) | |
2606 | return -EFAULT; | |
2607 | } | |
2608 | } | |
2609 | } | |
2610 | ||
7ac8d0d2 YS |
2611 | if (kallsyms_show_value(current_cred())) { |
2612 | if (copy_to_user(uaddrs, kmulti_link->addrs, ucount * sizeof(u64))) | |
2613 | return -EFAULT; | |
2614 | } else { | |
2615 | for (i = 0; i < ucount; i++) { | |
2616 | if (put_user(0, uaddrs + i)) | |
2617 | return -EFAULT; | |
2618 | } | |
2619 | } | |
2620 | return err; | |
2621 | } | |
2622 | ||
0dcac272 JO |
2623 | static const struct bpf_link_ops bpf_kprobe_multi_link_lops = { |
2624 | .release = bpf_kprobe_multi_link_release, | |
1a80dbcb | 2625 | .dealloc_deferred = bpf_kprobe_multi_link_dealloc, |
7ac8d0d2 | 2626 | .fill_link_info = bpf_kprobe_multi_link_fill_link_info, |
0dcac272 JO |
2627 | }; |
2628 | ||
ca74823c JO |
2629 | static void bpf_kprobe_multi_cookie_swap(void *a, void *b, int size, const void *priv) |
2630 | { | |
2631 | const struct bpf_kprobe_multi_link *link = priv; | |
2632 | unsigned long *addr_a = a, *addr_b = b; | |
2633 | u64 *cookie_a, *cookie_b; | |
ca74823c JO |
2634 | |
2635 | cookie_a = link->cookies + (addr_a - link->addrs); | |
2636 | cookie_b = link->cookies + (addr_b - link->addrs); | |
2637 | ||
2638 | /* swap addr_a/addr_b and cookie_a/cookie_b values */ | |
11e17ae4 JC |
2639 | swap(*addr_a, *addr_b); |
2640 | swap(*cookie_a, *cookie_b); | |
ca74823c JO |
2641 | } |
2642 | ||
1a1b0716 | 2643 | static int bpf_kprobe_multi_addrs_cmp(const void *a, const void *b) |
ca74823c JO |
2644 | { |
2645 | const unsigned long *addr_a = a, *addr_b = b; | |
2646 | ||
2647 | if (*addr_a == *addr_b) | |
2648 | return 0; | |
2649 | return *addr_a < *addr_b ? -1 : 1; | |
2650 | } | |
2651 | ||
2652 | static int bpf_kprobe_multi_cookie_cmp(const void *a, const void *b, const void *priv) | |
2653 | { | |
1a1b0716 | 2654 | return bpf_kprobe_multi_addrs_cmp(a, b); |
ca74823c JO |
2655 | } |
2656 | ||
f7098690 | 2657 | static u64 bpf_kprobe_multi_cookie(struct bpf_run_ctx *ctx) |
ca74823c | 2658 | { |
f7098690 | 2659 | struct bpf_kprobe_multi_run_ctx *run_ctx; |
ca74823c | 2660 | struct bpf_kprobe_multi_link *link; |
f7098690 | 2661 | u64 *cookie, entry_ip; |
ca74823c | 2662 | unsigned long *addr; |
ca74823c JO |
2663 | |
2664 | if (WARN_ON_ONCE(!ctx)) | |
2665 | return 0; | |
adf46d88 JO |
2666 | run_ctx = container_of(current->bpf_ctx, struct bpf_kprobe_multi_run_ctx, |
2667 | session_ctx.run_ctx); | |
f7098690 | 2668 | link = run_ctx->link; |
ca74823c JO |
2669 | if (!link->cookies) |
2670 | return 0; | |
f7098690 JO |
2671 | entry_ip = run_ctx->entry_ip; |
2672 | addr = bsearch(&entry_ip, link->addrs, link->cnt, sizeof(entry_ip), | |
1a1b0716 | 2673 | bpf_kprobe_multi_addrs_cmp); |
ca74823c JO |
2674 | if (!addr) |
2675 | return 0; | |
2676 | cookie = link->cookies + (addr - link->addrs); | |
2677 | return *cookie; | |
2678 | } | |
2679 | ||
f7098690 JO |
2680 | static u64 bpf_kprobe_multi_entry_ip(struct bpf_run_ctx *ctx) |
2681 | { | |
2682 | struct bpf_kprobe_multi_run_ctx *run_ctx; | |
2683 | ||
adf46d88 JO |
2684 | run_ctx = container_of(current->bpf_ctx, struct bpf_kprobe_multi_run_ctx, |
2685 | session_ctx.run_ctx); | |
f7098690 JO |
2686 | return run_ctx->entry_ip; |
2687 | } | |
2688 | ||
0dcac272 JO |
2689 | static int |
2690 | kprobe_multi_link_prog_run(struct bpf_kprobe_multi_link *link, | |
8e2759da | 2691 | unsigned long entry_ip, struct ftrace_regs *fregs, |
5c919ace | 2692 | bool is_return, void *data) |
0dcac272 | 2693 | { |
f7098690 | 2694 | struct bpf_kprobe_multi_run_ctx run_ctx = { |
adf46d88 JO |
2695 | .session_ctx = { |
2696 | .is_return = is_return, | |
5c919ace | 2697 | .data = data, |
adf46d88 | 2698 | }, |
f7098690 JO |
2699 | .link = link, |
2700 | .entry_ip = entry_ip, | |
2701 | }; | |
ca74823c | 2702 | struct bpf_run_ctx *old_run_ctx; |
8e2759da | 2703 | struct pt_regs *regs; |
0dcac272 JO |
2704 | int err; |
2705 | ||
2706 | if (unlikely(__this_cpu_inc_return(bpf_prog_active) != 1)) { | |
f915fcb3 | 2707 | bpf_prog_inc_misses_counter(link->link.prog); |
2ebadb60 | 2708 | err = 1; |
0dcac272 JO |
2709 | goto out; |
2710 | } | |
2711 | ||
2712 | migrate_disable(); | |
2713 | rcu_read_lock(); | |
8e2759da | 2714 | regs = ftrace_partial_regs(fregs, bpf_kprobe_multi_pt_regs_ptr()); |
adf46d88 | 2715 | old_run_ctx = bpf_set_run_ctx(&run_ctx.session_ctx.run_ctx); |
0dcac272 | 2716 | err = bpf_prog_run(link->link.prog, regs); |
ca74823c | 2717 | bpf_reset_run_ctx(old_run_ctx); |
0dcac272 JO |
2718 | rcu_read_unlock(); |
2719 | migrate_enable(); | |
2720 | ||
2721 | out: | |
2722 | __this_cpu_dec(bpf_prog_active); | |
2723 | return err; | |
2724 | } | |
2725 | ||
39d95420 | 2726 | static int |
c09eb2e5 | 2727 | kprobe_multi_link_handler(struct fprobe *fp, unsigned long fentry_ip, |
46bc0823 | 2728 | unsigned long ret_ip, struct ftrace_regs *fregs, |
cb16330d | 2729 | void *data) |
0dcac272 | 2730 | { |
0dcac272 | 2731 | struct bpf_kprobe_multi_link *link; |
535a3692 | 2732 | int err; |
0dcac272 | 2733 | |
39d95420 | 2734 | link = container_of(fp, struct bpf_kprobe_multi_link, fp); |
4f7caaa2 MHG |
2735 | err = kprobe_multi_link_prog_run(link, ftrace_get_entry_ip(fentry_ip), |
2736 | fregs, false, data); | |
535a3692 | 2737 | return is_kprobe_session(link->link.prog) ? err : 0; |
39d95420 MHG |
2738 | } |
2739 | ||
2740 | static void | |
2741 | kprobe_multi_link_exit_handler(struct fprobe *fp, unsigned long fentry_ip, | |
762abbc0 | 2742 | unsigned long ret_ip, struct ftrace_regs *fregs, |
cb16330d | 2743 | void *data) |
0dcac272 | 2744 | { |
0dcac272 JO |
2745 | struct bpf_kprobe_multi_link *link; |
2746 | ||
0dcac272 | 2747 | link = container_of(fp, struct bpf_kprobe_multi_link, fp); |
4f7caaa2 MHG |
2748 | kprobe_multi_link_prog_run(link, ftrace_get_entry_ip(fentry_ip), |
2749 | fregs, true, data); | |
0dcac272 JO |
2750 | } |
2751 | ||
eb5fb032 | 2752 | static int symbols_cmp_r(const void *a, const void *b, const void *priv) |
0dcac272 | 2753 | { |
0236fec5 JO |
2754 | const char **str_a = (const char **) a; |
2755 | const char **str_b = (const char **) b; | |
0dcac272 | 2756 | |
0236fec5 | 2757 | return strcmp(*str_a, *str_b); |
0dcac272 JO |
2758 | } |
2759 | ||
eb5fb032 JO |
2760 | struct multi_symbols_sort { |
2761 | const char **funcs; | |
2762 | u64 *cookies; | |
2763 | }; | |
2764 | ||
2765 | static void symbols_swap_r(void *a, void *b, int size, const void *priv) | |
2766 | { | |
2767 | const struct multi_symbols_sort *data = priv; | |
2768 | const char **name_a = a, **name_b = b; | |
2769 | ||
2770 | swap(*name_a, *name_b); | |
2771 | ||
2772 | /* If defined, swap also related cookies. */ | |
2773 | if (data->cookies) { | |
2774 | u64 *cookie_a, *cookie_b; | |
2775 | ||
2776 | cookie_a = data->cookies + (name_a - data->funcs); | |
2777 | cookie_b = data->cookies + (name_b - data->funcs); | |
2778 | swap(*cookie_a, *cookie_b); | |
2779 | } | |
2780 | } | |
2781 | ||
6a5f2d6e | 2782 | struct modules_array { |
e22061b2 JO |
2783 | struct module **mods; |
2784 | int mods_cnt; | |
2785 | int mods_cap; | |
2786 | }; | |
2787 | ||
6a5f2d6e | 2788 | static int add_module(struct modules_array *arr, struct module *mod) |
e22061b2 | 2789 | { |
e22061b2 JO |
2790 | struct module **mods; |
2791 | ||
6a5f2d6e JO |
2792 | if (arr->mods_cnt == arr->mods_cap) { |
2793 | arr->mods_cap = max(16, arr->mods_cap * 3 / 2); | |
2794 | mods = krealloc_array(arr->mods, arr->mods_cap, sizeof(*mods), GFP_KERNEL); | |
e22061b2 JO |
2795 | if (!mods) |
2796 | return -ENOMEM; | |
6a5f2d6e | 2797 | arr->mods = mods; |
e22061b2 JO |
2798 | } |
2799 | ||
6a5f2d6e JO |
2800 | arr->mods[arr->mods_cnt] = mod; |
2801 | arr->mods_cnt++; | |
e22061b2 JO |
2802 | return 0; |
2803 | } | |
2804 | ||
6a5f2d6e JO |
2805 | static bool has_module(struct modules_array *arr, struct module *mod) |
2806 | { | |
2807 | int i; | |
2808 | ||
2809 | for (i = arr->mods_cnt - 1; i >= 0; i--) { | |
2810 | if (arr->mods[i] == mod) | |
2811 | return true; | |
2812 | } | |
2813 | return false; | |
2814 | } | |
2815 | ||
e22061b2 JO |
2816 | static int get_modules_for_addrs(struct module ***mods, unsigned long *addrs, u32 addrs_cnt) |
2817 | { | |
6a5f2d6e JO |
2818 | struct modules_array arr = {}; |
2819 | u32 i, err = 0; | |
2820 | ||
2821 | for (i = 0; i < addrs_cnt; i++) { | |
8c6eb7ca | 2822 | bool skip_add = false; |
6a5f2d6e JO |
2823 | struct module *mod; |
2824 | ||
8c6eb7ca SAS |
2825 | scoped_guard(rcu) { |
2826 | mod = __module_address(addrs[i]); | |
2827 | /* Either no module or it's already stored */ | |
2828 | if (!mod || has_module(&arr, mod)) { | |
2829 | skip_add = true; | |
2830 | break; /* scoped_guard */ | |
2831 | } | |
2832 | if (!try_module_get(mod)) | |
2833 | err = -EINVAL; | |
6a5f2d6e | 2834 | } |
8c6eb7ca SAS |
2835 | if (skip_add) |
2836 | continue; | |
6a5f2d6e JO |
2837 | if (err) |
2838 | break; | |
2839 | err = add_module(&arr, mod); | |
2840 | if (err) { | |
2841 | module_put(mod); | |
2842 | break; | |
2843 | } | |
2844 | } | |
e22061b2 JO |
2845 | |
2846 | /* We return either err < 0 in case of error, ... */ | |
e22061b2 | 2847 | if (err) { |
6a5f2d6e JO |
2848 | kprobe_multi_put_modules(arr.mods, arr.mods_cnt); |
2849 | kfree(arr.mods); | |
e22061b2 JO |
2850 | return err; |
2851 | } | |
2852 | ||
2853 | /* or number of modules found if everything is ok. */ | |
6a5f2d6e JO |
2854 | *mods = arr.mods; |
2855 | return arr.mods_cnt; | |
e22061b2 JO |
2856 | } |
2857 | ||
41bc46c1 JO |
2858 | static int addrs_check_error_injection_list(unsigned long *addrs, u32 cnt) |
2859 | { | |
2860 | u32 i; | |
2861 | ||
2862 | for (i = 0; i < cnt; i++) { | |
2863 | if (!within_error_injection_list(addrs[i])) | |
2864 | return -EINVAL; | |
2865 | } | |
2866 | return 0; | |
2867 | } | |
2868 | ||
0dcac272 JO |
2869 | int bpf_kprobe_multi_link_attach(const union bpf_attr *attr, struct bpf_prog *prog) |
2870 | { | |
2871 | struct bpf_kprobe_multi_link *link = NULL; | |
2872 | struct bpf_link_primer link_primer; | |
ca74823c | 2873 | void __user *ucookies; |
0dcac272 JO |
2874 | unsigned long *addrs; |
2875 | u32 flags, cnt, size; | |
2876 | void __user *uaddrs; | |
ca74823c | 2877 | u64 *cookies = NULL; |
0dcac272 JO |
2878 | void __user *usyms; |
2879 | int err; | |
2880 | ||
2881 | /* no support for 32bit archs yet */ | |
2882 | if (sizeof(u64) != sizeof(void *)) | |
2883 | return -EOPNOTSUPP; | |
2884 | ||
24391198 TC |
2885 | if (attr->link_create.flags) |
2886 | return -EINVAL; | |
2887 | ||
535a3692 | 2888 | if (!is_kprobe_multi(prog)) |
0dcac272 JO |
2889 | return -EINVAL; |
2890 | ||
2891 | flags = attr->link_create.kprobe_multi.flags; | |
2892 | if (flags & ~BPF_F_KPROBE_MULTI_RETURN) | |
2893 | return -EINVAL; | |
2894 | ||
2895 | uaddrs = u64_to_user_ptr(attr->link_create.kprobe_multi.addrs); | |
2896 | usyms = u64_to_user_ptr(attr->link_create.kprobe_multi.syms); | |
2897 | if (!!uaddrs == !!usyms) | |
2898 | return -EINVAL; | |
2899 | ||
2900 | cnt = attr->link_create.kprobe_multi.cnt; | |
2901 | if (!cnt) | |
2902 | return -EINVAL; | |
d6d1e6c1 HT |
2903 | if (cnt > MAX_KPROBE_MULTI_CNT) |
2904 | return -E2BIG; | |
0dcac272 JO |
2905 | |
2906 | size = cnt * sizeof(*addrs); | |
fd58f7df | 2907 | addrs = kvmalloc_array(cnt, sizeof(*addrs), GFP_KERNEL); |
0dcac272 JO |
2908 | if (!addrs) |
2909 | return -ENOMEM; | |
2910 | ||
eb5fb032 JO |
2911 | ucookies = u64_to_user_ptr(attr->link_create.kprobe_multi.cookies); |
2912 | if (ucookies) { | |
2913 | cookies = kvmalloc_array(cnt, sizeof(*addrs), GFP_KERNEL); | |
2914 | if (!cookies) { | |
2915 | err = -ENOMEM; | |
2916 | goto error; | |
2917 | } | |
2918 | if (copy_from_user(cookies, ucookies, size)) { | |
2919 | err = -EFAULT; | |
2920 | goto error; | |
2921 | } | |
2922 | } | |
2923 | ||
0dcac272 JO |
2924 | if (uaddrs) { |
2925 | if (copy_from_user(addrs, uaddrs, size)) { | |
2926 | err = -EFAULT; | |
2927 | goto error; | |
2928 | } | |
2929 | } else { | |
eb5fb032 JO |
2930 | struct multi_symbols_sort data = { |
2931 | .cookies = cookies, | |
2932 | }; | |
0236fec5 JO |
2933 | struct user_syms us; |
2934 | ||
2935 | err = copy_user_syms(&us, usyms, cnt); | |
2936 | if (err) | |
2937 | goto error; | |
2938 | ||
eb5fb032 JO |
2939 | if (cookies) |
2940 | data.funcs = us.syms; | |
2941 | ||
2942 | sort_r(us.syms, cnt, sizeof(*us.syms), symbols_cmp_r, | |
2943 | symbols_swap_r, &data); | |
2944 | ||
0236fec5 JO |
2945 | err = ftrace_lookup_symbols(us.syms, cnt, addrs); |
2946 | free_user_syms(&us); | |
0dcac272 JO |
2947 | if (err) |
2948 | goto error; | |
2949 | } | |
2950 | ||
41bc46c1 JO |
2951 | if (prog->kprobe_override && addrs_check_error_injection_list(addrs, cnt)) { |
2952 | err = -EINVAL; | |
2953 | goto error; | |
2954 | } | |
2955 | ||
0dcac272 JO |
2956 | link = kzalloc(sizeof(*link), GFP_KERNEL); |
2957 | if (!link) { | |
2958 | err = -ENOMEM; | |
2959 | goto error; | |
2960 | } | |
2961 | ||
2962 | bpf_link_init(&link->link, BPF_LINK_TYPE_KPROBE_MULTI, | |
2963 | &bpf_kprobe_multi_link_lops, prog); | |
2964 | ||
2965 | err = bpf_link_prime(&link->link, &link_primer); | |
2966 | if (err) | |
2967 | goto error; | |
2968 | ||
535a3692 | 2969 | if (!(flags & BPF_F_KPROBE_MULTI_RETURN)) |
0dcac272 | 2970 | link->fp.entry_handler = kprobe_multi_link_handler; |
535a3692 JO |
2971 | if ((flags & BPF_F_KPROBE_MULTI_RETURN) || is_kprobe_session(prog)) |
2972 | link->fp.exit_handler = kprobe_multi_link_exit_handler; | |
5c919ace JO |
2973 | if (is_kprobe_session(prog)) |
2974 | link->fp.entry_data_size = sizeof(u64); | |
0dcac272 JO |
2975 | |
2976 | link->addrs = addrs; | |
ca74823c JO |
2977 | link->cookies = cookies; |
2978 | link->cnt = cnt; | |
7ac8d0d2 | 2979 | link->flags = flags; |
ca74823c JO |
2980 | |
2981 | if (cookies) { | |
2982 | /* | |
2983 | * Sorting addresses will trigger sorting cookies as well | |
2984 | * (check bpf_kprobe_multi_cookie_swap). This way we can | |
2985 | * find cookie based on the address in bpf_get_attach_cookie | |
2986 | * helper. | |
2987 | */ | |
2988 | sort_r(addrs, cnt, sizeof(*addrs), | |
2989 | bpf_kprobe_multi_cookie_cmp, | |
2990 | bpf_kprobe_multi_cookie_swap, | |
2991 | link); | |
e22061b2 JO |
2992 | } |
2993 | ||
2994 | err = get_modules_for_addrs(&link->mods, addrs, cnt); | |
2995 | if (err < 0) { | |
2996 | bpf_link_cleanup(&link_primer); | |
2997 | return err; | |
ca74823c | 2998 | } |
e22061b2 | 2999 | link->mods_cnt = err; |
0dcac272 JO |
3000 | |
3001 | err = register_fprobe_ips(&link->fp, addrs, cnt); | |
3002 | if (err) { | |
e22061b2 | 3003 | kprobe_multi_put_modules(link->mods, link->mods_cnt); |
0dcac272 JO |
3004 | bpf_link_cleanup(&link_primer); |
3005 | return err; | |
3006 | } | |
3007 | ||
3008 | return bpf_link_settle(&link_primer); | |
3009 | ||
3010 | error: | |
3011 | kfree(link); | |
3012 | kvfree(addrs); | |
ca74823c | 3013 | kvfree(cookies); |
0dcac272 JO |
3014 | return err; |
3015 | } | |
3016 | #else /* !CONFIG_FPROBE */ | |
3017 | int bpf_kprobe_multi_link_attach(const union bpf_attr *attr, struct bpf_prog *prog) | |
3018 | { | |
3019 | return -EOPNOTSUPP; | |
3020 | } | |
f7098690 JO |
3021 | static u64 bpf_kprobe_multi_cookie(struct bpf_run_ctx *ctx) |
3022 | { | |
3023 | return 0; | |
3024 | } | |
3025 | static u64 bpf_kprobe_multi_entry_ip(struct bpf_run_ctx *ctx) | |
ca74823c JO |
3026 | { |
3027 | return 0; | |
3028 | } | |
0dcac272 | 3029 | #endif |
89ae89f5 JO |
3030 | |
3031 | #ifdef CONFIG_UPROBES | |
3032 | struct bpf_uprobe_multi_link; | |
3033 | ||
3034 | struct bpf_uprobe { | |
3035 | struct bpf_uprobe_multi_link *link; | |
3036 | loff_t offset; | |
4930b7f5 | 3037 | unsigned long ref_ctr_offset; |
0b779b61 | 3038 | u64 cookie; |
3c83a9ad | 3039 | struct uprobe *uprobe; |
89ae89f5 | 3040 | struct uprobe_consumer consumer; |
d920179b | 3041 | bool session; |
89ae89f5 JO |
3042 | }; |
3043 | ||
3044 | struct bpf_uprobe_multi_link { | |
3045 | struct path path; | |
3046 | struct bpf_link link; | |
3047 | u32 cnt; | |
e56fdbfb | 3048 | u32 flags; |
89ae89f5 | 3049 | struct bpf_uprobe *uprobes; |
b733eead | 3050 | struct task_struct *task; |
89ae89f5 JO |
3051 | }; |
3052 | ||
3053 | struct bpf_uprobe_multi_run_ctx { | |
99b403d2 | 3054 | struct bpf_session_run_ctx session_ctx; |
89ae89f5 | 3055 | unsigned long entry_ip; |
0b779b61 | 3056 | struct bpf_uprobe *uprobe; |
89ae89f5 JO |
3057 | }; |
3058 | ||
3c83a9ad | 3059 | static void bpf_uprobe_unregister(struct bpf_uprobe *uprobes, u32 cnt) |
89ae89f5 JO |
3060 | { |
3061 | u32 i; | |
3062 | ||
3c83a9ad | 3063 | for (i = 0; i < cnt; i++) |
04b01625 PZ |
3064 | uprobe_unregister_nosync(uprobes[i].uprobe, &uprobes[i].consumer); |
3065 | ||
3066 | if (cnt) | |
3067 | uprobe_unregister_sync(); | |
89ae89f5 JO |
3068 | } |
3069 | ||
3070 | static void bpf_uprobe_multi_link_release(struct bpf_link *link) | |
3071 | { | |
3072 | struct bpf_uprobe_multi_link *umulti_link; | |
3073 | ||
3074 | umulti_link = container_of(link, struct bpf_uprobe_multi_link, link); | |
3c83a9ad | 3075 | bpf_uprobe_unregister(umulti_link->uprobes, umulti_link->cnt); |
e9c856ca AN |
3076 | if (umulti_link->task) |
3077 | put_task_struct(umulti_link->task); | |
3078 | path_put(&umulti_link->path); | |
89ae89f5 JO |
3079 | } |
3080 | ||
3081 | static void bpf_uprobe_multi_link_dealloc(struct bpf_link *link) | |
3082 | { | |
3083 | struct bpf_uprobe_multi_link *umulti_link; | |
3084 | ||
3085 | umulti_link = container_of(link, struct bpf_uprobe_multi_link, link); | |
89ae89f5 JO |
3086 | kvfree(umulti_link->uprobes); |
3087 | kfree(umulti_link); | |
3088 | } | |
3089 | ||
e56fdbfb JO |
3090 | static int bpf_uprobe_multi_link_fill_link_info(const struct bpf_link *link, |
3091 | struct bpf_link_info *info) | |
3092 | { | |
3093 | u64 __user *uref_ctr_offsets = u64_to_user_ptr(info->uprobe_multi.ref_ctr_offsets); | |
3094 | u64 __user *ucookies = u64_to_user_ptr(info->uprobe_multi.cookies); | |
3095 | u64 __user *uoffsets = u64_to_user_ptr(info->uprobe_multi.offsets); | |
3096 | u64 __user *upath = u64_to_user_ptr(info->uprobe_multi.path); | |
3097 | u32 upath_size = info->uprobe_multi.path_size; | |
3098 | struct bpf_uprobe_multi_link *umulti_link; | |
3099 | u32 ucount = info->uprobe_multi.count; | |
3100 | int err = 0, i; | |
ad6b5b6e TW |
3101 | char *p, *buf; |
3102 | long left = 0; | |
e56fdbfb JO |
3103 | |
3104 | if (!upath ^ !upath_size) | |
3105 | return -EINVAL; | |
3106 | ||
3107 | if ((uoffsets || uref_ctr_offsets || ucookies) && !ucount) | |
3108 | return -EINVAL; | |
3109 | ||
3110 | umulti_link = container_of(link, struct bpf_uprobe_multi_link, link); | |
3111 | info->uprobe_multi.count = umulti_link->cnt; | |
3112 | info->uprobe_multi.flags = umulti_link->flags; | |
3113 | info->uprobe_multi.pid = umulti_link->task ? | |
3114 | task_pid_nr_ns(umulti_link->task, task_active_pid_ns(current)) : 0; | |
3115 | ||
ad6b5b6e TW |
3116 | upath_size = upath_size ? min_t(u32, upath_size, PATH_MAX) : PATH_MAX; |
3117 | buf = kmalloc(upath_size, GFP_KERNEL); | |
3118 | if (!buf) | |
3119 | return -ENOMEM; | |
3120 | p = d_path(&umulti_link->path, buf, upath_size); | |
3121 | if (IS_ERR(p)) { | |
e56fdbfb | 3122 | kfree(buf); |
ad6b5b6e | 3123 | return PTR_ERR(p); |
e56fdbfb | 3124 | } |
ad6b5b6e TW |
3125 | upath_size = buf + upath_size - p; |
3126 | ||
3127 | if (upath) | |
3128 | left = copy_to_user(upath, p, upath_size); | |
3129 | kfree(buf); | |
3130 | if (left) | |
3131 | return -EFAULT; | |
3132 | info->uprobe_multi.path_size = upath_size; | |
e56fdbfb JO |
3133 | |
3134 | if (!uoffsets && !ucookies && !uref_ctr_offsets) | |
3135 | return 0; | |
3136 | ||
3137 | if (ucount < umulti_link->cnt) | |
3138 | err = -ENOSPC; | |
3139 | else | |
3140 | ucount = umulti_link->cnt; | |
3141 | ||
3142 | for (i = 0; i < ucount; i++) { | |
3143 | if (uoffsets && | |
3144 | put_user(umulti_link->uprobes[i].offset, uoffsets + i)) | |
3145 | return -EFAULT; | |
3146 | if (uref_ctr_offsets && | |
3147 | put_user(umulti_link->uprobes[i].ref_ctr_offset, uref_ctr_offsets + i)) | |
3148 | return -EFAULT; | |
3149 | if (ucookies && | |
3150 | put_user(umulti_link->uprobes[i].cookie, ucookies + i)) | |
3151 | return -EFAULT; | |
3152 | } | |
3153 | ||
3154 | return err; | |
3155 | } | |
3156 | ||
89ae89f5 JO |
3157 | static const struct bpf_link_ops bpf_uprobe_multi_link_lops = { |
3158 | .release = bpf_uprobe_multi_link_release, | |
1a80dbcb | 3159 | .dealloc_deferred = bpf_uprobe_multi_link_dealloc, |
e56fdbfb | 3160 | .fill_link_info = bpf_uprobe_multi_link_fill_link_info, |
89ae89f5 JO |
3161 | }; |
3162 | ||
3163 | static int uprobe_prog_run(struct bpf_uprobe *uprobe, | |
3164 | unsigned long entry_ip, | |
99b403d2 JO |
3165 | struct pt_regs *regs, |
3166 | bool is_return, void *data) | |
89ae89f5 JO |
3167 | { |
3168 | struct bpf_uprobe_multi_link *link = uprobe->link; | |
3169 | struct bpf_uprobe_multi_run_ctx run_ctx = { | |
99b403d2 JO |
3170 | .session_ctx = { |
3171 | .is_return = is_return, | |
3172 | .data = data, | |
3173 | }, | |
89ae89f5 | 3174 | .entry_ip = entry_ip, |
0b779b61 | 3175 | .uprobe = uprobe, |
89ae89f5 JO |
3176 | }; |
3177 | struct bpf_prog *prog = link->link.prog; | |
66c84731 | 3178 | bool sleepable = prog->sleepable; |
89ae89f5 | 3179 | struct bpf_run_ctx *old_run_ctx; |
99b403d2 | 3180 | int err; |
89ae89f5 | 3181 | |
900f362e | 3182 | if (link->task && !same_thread_group(current, link->task)) |
b733eead JO |
3183 | return 0; |
3184 | ||
89ae89f5 JO |
3185 | if (sleepable) |
3186 | rcu_read_lock_trace(); | |
3187 | else | |
3188 | rcu_read_lock(); | |
3189 | ||
3190 | migrate_disable(); | |
3191 | ||
99b403d2 JO |
3192 | old_run_ctx = bpf_set_run_ctx(&run_ctx.session_ctx.run_ctx); |
3193 | err = bpf_prog_run(link->link.prog, regs); | |
89ae89f5 JO |
3194 | bpf_reset_run_ctx(old_run_ctx); |
3195 | ||
3196 | migrate_enable(); | |
3197 | ||
3198 | if (sleepable) | |
3199 | rcu_read_unlock_trace(); | |
3200 | else | |
3201 | rcu_read_unlock(); | |
99b403d2 | 3202 | return err; |
89ae89f5 JO |
3203 | } |
3204 | ||
b733eead | 3205 | static bool |
59da880a | 3206 | uprobe_multi_link_filter(struct uprobe_consumer *con, struct mm_struct *mm) |
b733eead JO |
3207 | { |
3208 | struct bpf_uprobe *uprobe; | |
3209 | ||
3210 | uprobe = container_of(con, struct bpf_uprobe, consumer); | |
3211 | return uprobe->link->task->mm == mm; | |
3212 | } | |
3213 | ||
89ae89f5 | 3214 | static int |
da09a9e0 JO |
3215 | uprobe_multi_link_handler(struct uprobe_consumer *con, struct pt_regs *regs, |
3216 | __u64 *data) | |
89ae89f5 JO |
3217 | { |
3218 | struct bpf_uprobe *uprobe; | |
d920179b | 3219 | int ret; |
89ae89f5 JO |
3220 | |
3221 | uprobe = container_of(con, struct bpf_uprobe, consumer); | |
99b403d2 | 3222 | ret = uprobe_prog_run(uprobe, instruction_pointer(regs), regs, false, data); |
d920179b JO |
3223 | if (uprobe->session) |
3224 | return ret ? UPROBE_HANDLER_IGNORE : 0; | |
3225 | return 0; | |
89ae89f5 JO |
3226 | } |
3227 | ||
3228 | static int | |
da09a9e0 JO |
3229 | uprobe_multi_link_ret_handler(struct uprobe_consumer *con, unsigned long func, struct pt_regs *regs, |
3230 | __u64 *data) | |
89ae89f5 JO |
3231 | { |
3232 | struct bpf_uprobe *uprobe; | |
3233 | ||
3234 | uprobe = container_of(con, struct bpf_uprobe, consumer); | |
99b403d2 | 3235 | uprobe_prog_run(uprobe, func, regs, true, data); |
d920179b | 3236 | return 0; |
89ae89f5 JO |
3237 | } |
3238 | ||
686328d8 JO |
3239 | static u64 bpf_uprobe_multi_entry_ip(struct bpf_run_ctx *ctx) |
3240 | { | |
3241 | struct bpf_uprobe_multi_run_ctx *run_ctx; | |
3242 | ||
99b403d2 JO |
3243 | run_ctx = container_of(current->bpf_ctx, struct bpf_uprobe_multi_run_ctx, |
3244 | session_ctx.run_ctx); | |
686328d8 JO |
3245 | return run_ctx->entry_ip; |
3246 | } | |
3247 | ||
0b779b61 JO |
3248 | static u64 bpf_uprobe_multi_cookie(struct bpf_run_ctx *ctx) |
3249 | { | |
3250 | struct bpf_uprobe_multi_run_ctx *run_ctx; | |
3251 | ||
99b403d2 JO |
3252 | run_ctx = container_of(current->bpf_ctx, struct bpf_uprobe_multi_run_ctx, |
3253 | session_ctx.run_ctx); | |
0b779b61 JO |
3254 | return run_ctx->uprobe->cookie; |
3255 | } | |
3256 | ||
89ae89f5 JO |
3257 | int bpf_uprobe_multi_link_attach(const union bpf_attr *attr, struct bpf_prog *prog) |
3258 | { | |
3259 | struct bpf_uprobe_multi_link *link = NULL; | |
3260 | unsigned long __user *uref_ctr_offsets; | |
89ae89f5 JO |
3261 | struct bpf_link_primer link_primer; |
3262 | struct bpf_uprobe *uprobes = NULL; | |
b733eead | 3263 | struct task_struct *task = NULL; |
89ae89f5 | 3264 | unsigned long __user *uoffsets; |
0b779b61 | 3265 | u64 __user *ucookies; |
89ae89f5 JO |
3266 | void __user *upath; |
3267 | u32 flags, cnt, i; | |
3268 | struct path path; | |
3269 | char *name; | |
b733eead | 3270 | pid_t pid; |
89ae89f5 JO |
3271 | int err; |
3272 | ||
3273 | /* no support for 32bit archs yet */ | |
3274 | if (sizeof(u64) != sizeof(void *)) | |
3275 | return -EOPNOTSUPP; | |
3276 | ||
a76116f4 TC |
3277 | if (attr->link_create.flags) |
3278 | return -EINVAL; | |
3279 | ||
d920179b | 3280 | if (!is_uprobe_multi(prog)) |
89ae89f5 JO |
3281 | return -EINVAL; |
3282 | ||
3283 | flags = attr->link_create.uprobe_multi.flags; | |
3284 | if (flags & ~BPF_F_UPROBE_MULTI_RETURN) | |
3285 | return -EINVAL; | |
3286 | ||
3287 | /* | |
3288 | * path, offsets and cnt are mandatory, | |
0b779b61 | 3289 | * ref_ctr_offsets and cookies are optional |
89ae89f5 JO |
3290 | */ |
3291 | upath = u64_to_user_ptr(attr->link_create.uprobe_multi.path); | |
3292 | uoffsets = u64_to_user_ptr(attr->link_create.uprobe_multi.offsets); | |
3293 | cnt = attr->link_create.uprobe_multi.cnt; | |
46ba0e49 | 3294 | pid = attr->link_create.uprobe_multi.pid; |
89ae89f5 | 3295 | |
46ba0e49 | 3296 | if (!upath || !uoffsets || !cnt || pid < 0) |
89ae89f5 | 3297 | return -EINVAL; |
8b2efe51 HT |
3298 | if (cnt > MAX_UPROBE_MULTI_CNT) |
3299 | return -E2BIG; | |
89ae89f5 JO |
3300 | |
3301 | uref_ctr_offsets = u64_to_user_ptr(attr->link_create.uprobe_multi.ref_ctr_offsets); | |
0b779b61 | 3302 | ucookies = u64_to_user_ptr(attr->link_create.uprobe_multi.cookies); |
89ae89f5 JO |
3303 | |
3304 | name = strndup_user(upath, PATH_MAX); | |
3305 | if (IS_ERR(name)) { | |
3306 | err = PTR_ERR(name); | |
3307 | return err; | |
3308 | } | |
3309 | ||
3310 | err = kern_path(name, LOOKUP_FOLLOW, &path); | |
3311 | kfree(name); | |
3312 | if (err) | |
3313 | return err; | |
3314 | ||
3315 | if (!d_is_reg(path.dentry)) { | |
3316 | err = -EBADF; | |
3317 | goto error_path_put; | |
3318 | } | |
3319 | ||
b733eead | 3320 | if (pid) { |
4e2e6841 | 3321 | rcu_read_lock(); |
46ba0e49 | 3322 | task = get_pid_task(find_vpid(pid), PIDTYPE_TGID); |
4e2e6841 | 3323 | rcu_read_unlock(); |
57eb5e1c JO |
3324 | if (!task) { |
3325 | err = -ESRCH; | |
b733eead | 3326 | goto error_path_put; |
57eb5e1c | 3327 | } |
b733eead JO |
3328 | } |
3329 | ||
89ae89f5 JO |
3330 | err = -ENOMEM; |
3331 | ||
3332 | link = kzalloc(sizeof(*link), GFP_KERNEL); | |
3333 | uprobes = kvcalloc(cnt, sizeof(*uprobes), GFP_KERNEL); | |
3334 | ||
3335 | if (!uprobes || !link) | |
3336 | goto error_free; | |
3337 | ||
89ae89f5 | 3338 | for (i = 0; i < cnt; i++) { |
3983c002 | 3339 | if (__get_user(uprobes[i].offset, uoffsets + i)) { |
0b779b61 JO |
3340 | err = -EFAULT; |
3341 | goto error_free; | |
3342 | } | |
3983c002 JO |
3343 | if (uprobes[i].offset < 0) { |
3344 | err = -EINVAL; | |
3345 | goto error_free; | |
3346 | } | |
4930b7f5 | 3347 | if (uref_ctr_offsets && __get_user(uprobes[i].ref_ctr_offset, uref_ctr_offsets + i)) { |
89ae89f5 JO |
3348 | err = -EFAULT; |
3349 | goto error_free; | |
3350 | } | |
3983c002 | 3351 | if (ucookies && __get_user(uprobes[i].cookie, ucookies + i)) { |
89ae89f5 JO |
3352 | err = -EFAULT; |
3353 | goto error_free; | |
3354 | } | |
3355 | ||
3356 | uprobes[i].link = link; | |
3357 | ||
d920179b | 3358 | if (!(flags & BPF_F_UPROBE_MULTI_RETURN)) |
89ae89f5 | 3359 | uprobes[i].consumer.handler = uprobe_multi_link_handler; |
d920179b JO |
3360 | if (flags & BPF_F_UPROBE_MULTI_RETURN || is_uprobe_session(prog)) |
3361 | uprobes[i].consumer.ret_handler = uprobe_multi_link_ret_handler; | |
3362 | if (is_uprobe_session(prog)) | |
3363 | uprobes[i].session = true; | |
b733eead JO |
3364 | if (pid) |
3365 | uprobes[i].consumer.filter = uprobe_multi_link_filter; | |
89ae89f5 JO |
3366 | } |
3367 | ||
3368 | link->cnt = cnt; | |
3369 | link->uprobes = uprobes; | |
3370 | link->path = path; | |
b733eead | 3371 | link->task = task; |
e56fdbfb | 3372 | link->flags = flags; |
89ae89f5 JO |
3373 | |
3374 | bpf_link_init(&link->link, BPF_LINK_TYPE_UPROBE_MULTI, | |
3375 | &bpf_uprobe_multi_link_lops, prog); | |
3376 | ||
3377 | for (i = 0; i < cnt; i++) { | |
3c83a9ad ON |
3378 | uprobes[i].uprobe = uprobe_register(d_real_inode(link->path.dentry), |
3379 | uprobes[i].offset, | |
3380 | uprobes[i].ref_ctr_offset, | |
3381 | &uprobes[i].consumer); | |
3382 | if (IS_ERR(uprobes[i].uprobe)) { | |
3383 | err = PTR_ERR(uprobes[i].uprobe); | |
5fe6e308 ON |
3384 | link->cnt = i; |
3385 | goto error_unregister; | |
89ae89f5 JO |
3386 | } |
3387 | } | |
3388 | ||
3389 | err = bpf_link_prime(&link->link, &link_primer); | |
3390 | if (err) | |
5fe6e308 | 3391 | goto error_unregister; |
89ae89f5 | 3392 | |
89ae89f5 JO |
3393 | return bpf_link_settle(&link_primer); |
3394 | ||
5fe6e308 ON |
3395 | error_unregister: |
3396 | bpf_uprobe_unregister(uprobes, link->cnt); | |
3397 | ||
89ae89f5 | 3398 | error_free: |
89ae89f5 JO |
3399 | kvfree(uprobes); |
3400 | kfree(link); | |
b733eead JO |
3401 | if (task) |
3402 | put_task_struct(task); | |
89ae89f5 JO |
3403 | error_path_put: |
3404 | path_put(&path); | |
3405 | return err; | |
3406 | } | |
3407 | #else /* !CONFIG_UPROBES */ | |
3408 | int bpf_uprobe_multi_link_attach(const union bpf_attr *attr, struct bpf_prog *prog) | |
3409 | { | |
3410 | return -EOPNOTSUPP; | |
3411 | } | |
0b779b61 JO |
3412 | static u64 bpf_uprobe_multi_cookie(struct bpf_run_ctx *ctx) |
3413 | { | |
3414 | return 0; | |
3415 | } | |
686328d8 JO |
3416 | static u64 bpf_uprobe_multi_entry_ip(struct bpf_run_ctx *ctx) |
3417 | { | |
3418 | return 0; | |
3419 | } | |
89ae89f5 | 3420 | #endif /* CONFIG_UPROBES */ |
adf46d88 | 3421 | |
adf46d88 JO |
3422 | __bpf_kfunc_start_defs(); |
3423 | ||
3424 | __bpf_kfunc bool bpf_session_is_return(void) | |
3425 | { | |
3426 | struct bpf_session_run_ctx *session_ctx; | |
3427 | ||
3428 | session_ctx = container_of(current->bpf_ctx, struct bpf_session_run_ctx, run_ctx); | |
3429 | return session_ctx->is_return; | |
3430 | } | |
3431 | ||
717d6313 | 3432 | __bpf_kfunc __u64 *bpf_session_cookie(void) |
5c919ace JO |
3433 | { |
3434 | struct bpf_session_run_ctx *session_ctx; | |
3435 | ||
3436 | session_ctx = container_of(current->bpf_ctx, struct bpf_session_run_ctx, run_ctx); | |
3437 | return session_ctx->data; | |
3438 | } | |
3439 | ||
adf46d88 JO |
3440 | __bpf_kfunc_end_defs(); |
3441 | ||
3442 | BTF_KFUNCS_START(kprobe_multi_kfunc_set_ids) | |
3443 | BTF_ID_FLAGS(func, bpf_session_is_return) | |
5c919ace | 3444 | BTF_ID_FLAGS(func, bpf_session_cookie) |
adf46d88 JO |
3445 | BTF_KFUNCS_END(kprobe_multi_kfunc_set_ids) |
3446 | ||
3447 | static int bpf_kprobe_multi_filter(const struct bpf_prog *prog, u32 kfunc_id) | |
3448 | { | |
3449 | if (!btf_id_set8_contains(&kprobe_multi_kfunc_set_ids, kfunc_id)) | |
3450 | return 0; | |
3451 | ||
99b403d2 | 3452 | if (!is_kprobe_session(prog) && !is_uprobe_session(prog)) |
adf46d88 JO |
3453 | return -EACCES; |
3454 | ||
3455 | return 0; | |
3456 | } | |
3457 | ||
3458 | static const struct btf_kfunc_id_set bpf_kprobe_multi_kfunc_set = { | |
3459 | .owner = THIS_MODULE, | |
3460 | .set = &kprobe_multi_kfunc_set_ids, | |
3461 | .filter = bpf_kprobe_multi_filter, | |
3462 | }; | |
3463 | ||
3464 | static int __init bpf_kprobe_multi_kfuncs_init(void) | |
3465 | { | |
3466 | return register_btf_kfunc_id_set(BPF_PROG_TYPE_KPROBE, &bpf_kprobe_multi_kfunc_set); | |
3467 | } | |
3468 | ||
3469 | late_initcall(bpf_kprobe_multi_kfuncs_init); | |
6280cf71 | 3470 | |
a498ee75 MY |
3471 | typedef int (*copy_fn_t)(void *dst, const void *src, u32 size, struct task_struct *tsk); |
3472 | ||
3473 | /* | |
3474 | * The __always_inline is to make sure the compiler doesn't | |
3475 | * generate indirect calls into callbacks, which is expensive, | |
3476 | * on some kernel configurations. This allows compiler to put | |
3477 | * direct calls into all the specific callback implementations | |
3478 | * (copy_user_data_sleepable, copy_user_data_nofault, and so on) | |
3479 | */ | |
3480 | static __always_inline int __bpf_dynptr_copy_str(struct bpf_dynptr *dptr, u32 doff, u32 size, | |
3481 | const void *unsafe_src, | |
3482 | copy_fn_t str_copy_fn, | |
3483 | struct task_struct *tsk) | |
3484 | { | |
3485 | struct bpf_dynptr_kern *dst; | |
3486 | u32 chunk_sz, off; | |
3487 | void *dst_slice; | |
3488 | int cnt, err; | |
3489 | char buf[256]; | |
3490 | ||
3491 | dst_slice = bpf_dynptr_slice_rdwr(dptr, doff, NULL, size); | |
3492 | if (likely(dst_slice)) | |
3493 | return str_copy_fn(dst_slice, unsafe_src, size, tsk); | |
3494 | ||
3495 | dst = (struct bpf_dynptr_kern *)dptr; | |
3496 | if (bpf_dynptr_check_off_len(dst, doff, size)) | |
3497 | return -E2BIG; | |
3498 | ||
3499 | for (off = 0; off < size; off += chunk_sz - 1) { | |
3500 | chunk_sz = min_t(u32, sizeof(buf), size - off); | |
3501 | /* Expect str_copy_fn to return count of copied bytes, including | |
3502 | * zero terminator. Next iteration increment off by chunk_sz - 1 to | |
3503 | * overwrite NUL. | |
3504 | */ | |
3505 | cnt = str_copy_fn(buf, unsafe_src + off, chunk_sz, tsk); | |
3506 | if (cnt < 0) | |
3507 | return cnt; | |
3508 | err = __bpf_dynptr_write(dst, doff + off, buf, cnt, 0); | |
3509 | if (err) | |
3510 | return err; | |
3511 | if (cnt < chunk_sz || chunk_sz == 1) /* we are done */ | |
3512 | return off + cnt; | |
3513 | } | |
3514 | return off; | |
3515 | } | |
3516 | ||
3517 | static __always_inline int __bpf_dynptr_copy(const struct bpf_dynptr *dptr, u32 doff, | |
3518 | u32 size, const void *unsafe_src, | |
3519 | copy_fn_t copy_fn, struct task_struct *tsk) | |
3520 | { | |
3521 | struct bpf_dynptr_kern *dst; | |
3522 | void *dst_slice; | |
3523 | char buf[256]; | |
3524 | u32 off, chunk_sz; | |
3525 | int err; | |
3526 | ||
3527 | dst_slice = bpf_dynptr_slice_rdwr(dptr, doff, NULL, size); | |
3528 | if (likely(dst_slice)) | |
3529 | return copy_fn(dst_slice, unsafe_src, size, tsk); | |
3530 | ||
3531 | dst = (struct bpf_dynptr_kern *)dptr; | |
3532 | if (bpf_dynptr_check_off_len(dst, doff, size)) | |
3533 | return -E2BIG; | |
3534 | ||
3535 | for (off = 0; off < size; off += chunk_sz) { | |
3536 | chunk_sz = min_t(u32, sizeof(buf), size - off); | |
3537 | err = copy_fn(buf, unsafe_src + off, chunk_sz, tsk); | |
3538 | if (err) | |
3539 | return err; | |
3540 | err = __bpf_dynptr_write(dst, doff + off, buf, chunk_sz, 0); | |
3541 | if (err) | |
3542 | return err; | |
3543 | } | |
3544 | return 0; | |
3545 | } | |
3546 | ||
3547 | static __always_inline int copy_user_data_nofault(void *dst, const void *unsafe_src, | |
3548 | u32 size, struct task_struct *tsk) | |
3549 | { | |
3550 | return copy_from_user_nofault(dst, (const void __user *)unsafe_src, size); | |
3551 | } | |
3552 | ||
3553 | static __always_inline int copy_user_data_sleepable(void *dst, const void *unsafe_src, | |
3554 | u32 size, struct task_struct *tsk) | |
3555 | { | |
3556 | int ret; | |
3557 | ||
079e5c56 MY |
3558 | if (!tsk) { /* Read from the current task */ |
3559 | ret = copy_from_user(dst, (const void __user *)unsafe_src, size); | |
3560 | if (ret) | |
3561 | return -EFAULT; | |
3562 | return 0; | |
3563 | } | |
a498ee75 MY |
3564 | |
3565 | ret = access_process_vm(tsk, (unsigned long)unsafe_src, dst, size, 0); | |
3566 | if (ret != size) | |
3567 | return -EFAULT; | |
3568 | return 0; | |
3569 | } | |
3570 | ||
3571 | static __always_inline int copy_kernel_data_nofault(void *dst, const void *unsafe_src, | |
3572 | u32 size, struct task_struct *tsk) | |
3573 | { | |
3574 | return copy_from_kernel_nofault(dst, unsafe_src, size); | |
3575 | } | |
3576 | ||
3577 | static __always_inline int copy_user_str_nofault(void *dst, const void *unsafe_src, | |
3578 | u32 size, struct task_struct *tsk) | |
3579 | { | |
3580 | return strncpy_from_user_nofault(dst, (const void __user *)unsafe_src, size); | |
3581 | } | |
3582 | ||
3583 | static __always_inline int copy_user_str_sleepable(void *dst, const void *unsafe_src, | |
3584 | u32 size, struct task_struct *tsk) | |
3585 | { | |
3586 | int ret; | |
3587 | ||
3588 | if (unlikely(size == 0)) | |
3589 | return 0; | |
3590 | ||
3591 | if (tsk) { | |
3592 | ret = copy_remote_vm_str(tsk, (unsigned long)unsafe_src, dst, size, 0); | |
3593 | } else { | |
3594 | ret = strncpy_from_user(dst, (const void __user *)unsafe_src, size - 1); | |
3595 | /* strncpy_from_user does not guarantee NUL termination */ | |
3596 | if (ret >= 0) | |
3597 | ((char *)dst)[ret] = '\0'; | |
3598 | } | |
3599 | ||
3600 | if (ret < 0) | |
3601 | return ret; | |
3602 | return ret + 1; | |
3603 | } | |
3604 | ||
3605 | static __always_inline int copy_kernel_str_nofault(void *dst, const void *unsafe_src, | |
3606 | u32 size, struct task_struct *tsk) | |
3607 | { | |
3608 | return strncpy_from_kernel_nofault(dst, unsafe_src, size); | |
3609 | } | |
3610 | ||
6280cf71 PM |
3611 | __bpf_kfunc_start_defs(); |
3612 | ||
3613 | __bpf_kfunc int bpf_send_signal_task(struct task_struct *task, int sig, enum pid_type type, | |
3614 | u64 value) | |
3615 | { | |
3616 | if (type != PIDTYPE_PID && type != PIDTYPE_TGID) | |
3617 | return -EINVAL; | |
3618 | ||
3619 | return bpf_send_signal_common(sig, type, task, value); | |
3620 | } | |
3621 | ||
a498ee75 MY |
3622 | __bpf_kfunc int bpf_probe_read_user_dynptr(struct bpf_dynptr *dptr, u32 off, |
3623 | u32 size, const void __user *unsafe_ptr__ign) | |
3624 | { | |
3625 | return __bpf_dynptr_copy(dptr, off, size, (const void *)unsafe_ptr__ign, | |
3626 | copy_user_data_nofault, NULL); | |
3627 | } | |
3628 | ||
3629 | __bpf_kfunc int bpf_probe_read_kernel_dynptr(struct bpf_dynptr *dptr, u32 off, | |
3630 | u32 size, const void *unsafe_ptr__ign) | |
3631 | { | |
3632 | return __bpf_dynptr_copy(dptr, off, size, unsafe_ptr__ign, | |
3633 | copy_kernel_data_nofault, NULL); | |
3634 | } | |
3635 | ||
3636 | __bpf_kfunc int bpf_probe_read_user_str_dynptr(struct bpf_dynptr *dptr, u32 off, | |
3637 | u32 size, const void __user *unsafe_ptr__ign) | |
3638 | { | |
3639 | return __bpf_dynptr_copy_str(dptr, off, size, (const void *)unsafe_ptr__ign, | |
3640 | copy_user_str_nofault, NULL); | |
3641 | } | |
3642 | ||
3643 | __bpf_kfunc int bpf_probe_read_kernel_str_dynptr(struct bpf_dynptr *dptr, u32 off, | |
3644 | u32 size, const void *unsafe_ptr__ign) | |
3645 | { | |
3646 | return __bpf_dynptr_copy_str(dptr, off, size, unsafe_ptr__ign, | |
3647 | copy_kernel_str_nofault, NULL); | |
3648 | } | |
3649 | ||
3650 | __bpf_kfunc int bpf_copy_from_user_dynptr(struct bpf_dynptr *dptr, u32 off, | |
3651 | u32 size, const void __user *unsafe_ptr__ign) | |
3652 | { | |
3653 | return __bpf_dynptr_copy(dptr, off, size, (const void *)unsafe_ptr__ign, | |
3654 | copy_user_data_sleepable, NULL); | |
3655 | } | |
3656 | ||
3657 | __bpf_kfunc int bpf_copy_from_user_str_dynptr(struct bpf_dynptr *dptr, u32 off, | |
3658 | u32 size, const void __user *unsafe_ptr__ign) | |
3659 | { | |
3660 | return __bpf_dynptr_copy_str(dptr, off, size, (const void *)unsafe_ptr__ign, | |
3661 | copy_user_str_sleepable, NULL); | |
3662 | } | |
3663 | ||
3664 | __bpf_kfunc int bpf_copy_from_user_task_dynptr(struct bpf_dynptr *dptr, u32 off, | |
3665 | u32 size, const void __user *unsafe_ptr__ign, | |
3666 | struct task_struct *tsk) | |
3667 | { | |
3668 | return __bpf_dynptr_copy(dptr, off, size, (const void *)unsafe_ptr__ign, | |
3669 | copy_user_data_sleepable, tsk); | |
3670 | } | |
3671 | ||
3672 | __bpf_kfunc int bpf_copy_from_user_task_str_dynptr(struct bpf_dynptr *dptr, u32 off, | |
3673 | u32 size, const void __user *unsafe_ptr__ign, | |
3674 | struct task_struct *tsk) | |
3675 | { | |
3676 | return __bpf_dynptr_copy_str(dptr, off, size, (const void *)unsafe_ptr__ign, | |
3677 | copy_user_str_sleepable, tsk); | |
3678 | } | |
3679 | ||
6280cf71 | 3680 | __bpf_kfunc_end_defs(); |