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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> |
ac9c05e0 | 27 | #include <linux/fileattr.h> |
6f100640 | 28 | |
8e4597c6 | 29 | #include <net/bpf_sk_storage.h> |
9802d865 | 30 | |
c4d0bfb4 AM |
31 | #include <uapi/linux/bpf.h> |
32 | #include <uapi/linux/btf.h> | |
33 | ||
c7b6f29b NA |
34 | #include <asm/tlb.h> |
35 | ||
9802d865 | 36 | #include "trace_probe.h" |
2541517c AS |
37 | #include "trace.h" |
38 | ||
ac5a72ea AM |
39 | #define CREATE_TRACE_POINTS |
40 | #include "bpf_trace.h" | |
41 | ||
e672db03 SF |
42 | #define bpf_event_rcu_dereference(p) \ |
43 | rcu_dereference_protected(p, lockdep_is_held(&bpf_event_mutex)) | |
44 | ||
8b2efe51 | 45 | #define MAX_UPROBE_MULTI_CNT (1U << 20) |
d6d1e6c1 | 46 | #define MAX_KPROBE_MULTI_CNT (1U << 20) |
8b2efe51 | 47 | |
a38d1107 MM |
48 | #ifdef CONFIG_MODULES |
49 | struct bpf_trace_module { | |
50 | struct module *module; | |
51 | struct list_head list; | |
52 | }; | |
53 | ||
54 | static LIST_HEAD(bpf_trace_modules); | |
55 | static DEFINE_MUTEX(bpf_module_mutex); | |
56 | ||
57 | static struct bpf_raw_event_map *bpf_get_raw_tracepoint_module(const char *name) | |
58 | { | |
59 | struct bpf_raw_event_map *btp, *ret = NULL; | |
60 | struct bpf_trace_module *btm; | |
61 | unsigned int i; | |
62 | ||
63 | mutex_lock(&bpf_module_mutex); | |
64 | list_for_each_entry(btm, &bpf_trace_modules, list) { | |
65 | for (i = 0; i < btm->module->num_bpf_raw_events; ++i) { | |
66 | btp = &btm->module->bpf_raw_events[i]; | |
67 | if (!strcmp(btp->tp->name, name)) { | |
68 | if (try_module_get(btm->module)) | |
69 | ret = btp; | |
70 | goto out; | |
71 | } | |
72 | } | |
73 | } | |
74 | out: | |
75 | mutex_unlock(&bpf_module_mutex); | |
76 | return ret; | |
77 | } | |
78 | #else | |
79 | static struct bpf_raw_event_map *bpf_get_raw_tracepoint_module(const char *name) | |
80 | { | |
81 | return NULL; | |
82 | } | |
83 | #endif /* CONFIG_MODULES */ | |
84 | ||
035226b9 | 85 | u64 bpf_get_stackid(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5); |
c195651e | 86 | u64 bpf_get_stack(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5); |
035226b9 | 87 | |
eb411377 AM |
88 | static int bpf_btf_printf_prepare(struct btf_ptr *ptr, u32 btf_ptr_size, |
89 | u64 flags, const struct btf **btf, | |
90 | s32 *btf_id); | |
f7098690 JO |
91 | static u64 bpf_kprobe_multi_cookie(struct bpf_run_ctx *ctx); |
92 | static u64 bpf_kprobe_multi_entry_ip(struct bpf_run_ctx *ctx); | |
eb411377 | 93 | |
0b779b61 | 94 | static u64 bpf_uprobe_multi_cookie(struct bpf_run_ctx *ctx); |
686328d8 | 95 | static u64 bpf_uprobe_multi_entry_ip(struct bpf_run_ctx *ctx); |
0b779b61 | 96 | |
2541517c AS |
97 | /** |
98 | * trace_call_bpf - invoke BPF program | |
e87c6bc3 | 99 | * @call: tracepoint event |
2541517c AS |
100 | * @ctx: opaque context pointer |
101 | * | |
102 | * kprobe handlers execute BPF programs via this helper. | |
103 | * Can be used from static tracepoints in the future. | |
104 | * | |
105 | * Return: BPF programs always return an integer which is interpreted by | |
106 | * kprobe handler as: | |
107 | * 0 - return from kprobe (event is filtered out) | |
108 | * 1 - store kprobe event into ring buffer | |
109 | * Other values are reserved and currently alias to 1 | |
110 | */ | |
e87c6bc3 | 111 | unsigned int trace_call_bpf(struct trace_event_call *call, void *ctx) |
2541517c AS |
112 | { |
113 | unsigned int ret; | |
114 | ||
b0a81b94 | 115 | cant_sleep(); |
2541517c AS |
116 | |
117 | if (unlikely(__this_cpu_inc_return(bpf_prog_active) != 1)) { | |
118 | /* | |
119 | * since some bpf program is already running on this cpu, | |
120 | * don't call into another bpf program (same or different) | |
121 | * and don't send kprobe event into ring-buffer, | |
122 | * so return zero here | |
123 | */ | |
dd865789 JO |
124 | rcu_read_lock(); |
125 | bpf_prog_inc_misses_counters(rcu_dereference(call->prog_array)); | |
126 | rcu_read_unlock(); | |
2541517c AS |
127 | ret = 0; |
128 | goto out; | |
129 | } | |
130 | ||
e87c6bc3 YS |
131 | /* |
132 | * Instead of moving rcu_read_lock/rcu_dereference/rcu_read_unlock | |
133 | * to all call sites, we did a bpf_prog_array_valid() there to check | |
134 | * whether call->prog_array is empty or not, which is | |
2b5894cc | 135 | * a heuristic to speed up execution. |
e87c6bc3 YS |
136 | * |
137 | * If bpf_prog_array_valid() fetched prog_array was | |
138 | * non-NULL, we go into trace_call_bpf() and do the actual | |
139 | * proper rcu_dereference() under RCU lock. | |
140 | * If it turns out that prog_array is NULL then, we bail out. | |
141 | * For the opposite, if the bpf_prog_array_valid() fetched pointer | |
142 | * was NULL, you'll skip the prog_array with the risk of missing | |
143 | * out of events when it was updated in between this and the | |
144 | * rcu_dereference() which is accepted risk. | |
145 | */ | |
055eb955 SF |
146 | rcu_read_lock(); |
147 | ret = bpf_prog_run_array(rcu_dereference(call->prog_array), | |
148 | ctx, bpf_prog_run); | |
149 | rcu_read_unlock(); | |
2541517c AS |
150 | |
151 | out: | |
152 | __this_cpu_dec(bpf_prog_active); | |
2541517c AS |
153 | |
154 | return ret; | |
155 | } | |
2541517c | 156 | |
9802d865 JB |
157 | #ifdef CONFIG_BPF_KPROBE_OVERRIDE |
158 | BPF_CALL_2(bpf_override_return, struct pt_regs *, regs, unsigned long, rc) | |
159 | { | |
9802d865 | 160 | regs_set_return_value(regs, rc); |
540adea3 | 161 | override_function_with_return(regs); |
9802d865 JB |
162 | return 0; |
163 | } | |
164 | ||
165 | static const struct bpf_func_proto bpf_override_return_proto = { | |
166 | .func = bpf_override_return, | |
167 | .gpl_only = true, | |
168 | .ret_type = RET_INTEGER, | |
169 | .arg1_type = ARG_PTR_TO_CTX, | |
170 | .arg2_type = ARG_ANYTHING, | |
171 | }; | |
172 | #endif | |
173 | ||
8d92db5c CH |
174 | static __always_inline int |
175 | bpf_probe_read_user_common(void *dst, u32 size, const void __user *unsafe_ptr) | |
2541517c | 176 | { |
8d92db5c | 177 | int ret; |
2541517c | 178 | |
c0ee37e8 | 179 | ret = copy_from_user_nofault(dst, unsafe_ptr, size); |
6ae08ae3 DB |
180 | if (unlikely(ret < 0)) |
181 | memset(dst, 0, size); | |
6ae08ae3 DB |
182 | return ret; |
183 | } | |
184 | ||
8d92db5c CH |
185 | BPF_CALL_3(bpf_probe_read_user, void *, dst, u32, size, |
186 | const void __user *, unsafe_ptr) | |
187 | { | |
188 | return bpf_probe_read_user_common(dst, size, unsafe_ptr); | |
189 | } | |
190 | ||
f470378c | 191 | const struct bpf_func_proto bpf_probe_read_user_proto = { |
6ae08ae3 DB |
192 | .func = bpf_probe_read_user, |
193 | .gpl_only = true, | |
194 | .ret_type = RET_INTEGER, | |
195 | .arg1_type = ARG_PTR_TO_UNINIT_MEM, | |
196 | .arg2_type = ARG_CONST_SIZE_OR_ZERO, | |
197 | .arg3_type = ARG_ANYTHING, | |
198 | }; | |
199 | ||
8d92db5c CH |
200 | static __always_inline int |
201 | bpf_probe_read_user_str_common(void *dst, u32 size, | |
202 | const void __user *unsafe_ptr) | |
6ae08ae3 | 203 | { |
8d92db5c | 204 | int ret; |
6ae08ae3 | 205 | |
6fa6d280 DX |
206 | /* |
207 | * NB: We rely on strncpy_from_user() not copying junk past the NUL | |
208 | * terminator into `dst`. | |
209 | * | |
210 | * strncpy_from_user() does long-sized strides in the fast path. If the | |
211 | * strncpy does not mask out the bytes after the NUL in `unsafe_ptr`, | |
212 | * then there could be junk after the NUL in `dst`. If user takes `dst` | |
213 | * and keys a hash map with it, then semantically identical strings can | |
214 | * occupy multiple entries in the map. | |
215 | */ | |
8d92db5c | 216 | ret = strncpy_from_user_nofault(dst, unsafe_ptr, size); |
6ae08ae3 DB |
217 | if (unlikely(ret < 0)) |
218 | memset(dst, 0, size); | |
6ae08ae3 DB |
219 | return ret; |
220 | } | |
221 | ||
8d92db5c CH |
222 | BPF_CALL_3(bpf_probe_read_user_str, void *, dst, u32, size, |
223 | const void __user *, unsafe_ptr) | |
224 | { | |
225 | return bpf_probe_read_user_str_common(dst, size, unsafe_ptr); | |
226 | } | |
227 | ||
f470378c | 228 | const struct bpf_func_proto bpf_probe_read_user_str_proto = { |
6ae08ae3 DB |
229 | .func = bpf_probe_read_user_str, |
230 | .gpl_only = true, | |
231 | .ret_type = RET_INTEGER, | |
232 | .arg1_type = ARG_PTR_TO_UNINIT_MEM, | |
233 | .arg2_type = ARG_CONST_SIZE_OR_ZERO, | |
234 | .arg3_type = ARG_ANYTHING, | |
235 | }; | |
236 | ||
6ae08ae3 DB |
237 | BPF_CALL_3(bpf_probe_read_kernel, void *, dst, u32, size, |
238 | const void *, unsafe_ptr) | |
239 | { | |
8d92db5c | 240 | return bpf_probe_read_kernel_common(dst, size, unsafe_ptr); |
6ae08ae3 DB |
241 | } |
242 | ||
f470378c | 243 | const struct bpf_func_proto bpf_probe_read_kernel_proto = { |
6ae08ae3 DB |
244 | .func = bpf_probe_read_kernel, |
245 | .gpl_only = true, | |
246 | .ret_type = RET_INTEGER, | |
247 | .arg1_type = ARG_PTR_TO_UNINIT_MEM, | |
248 | .arg2_type = ARG_CONST_SIZE_OR_ZERO, | |
249 | .arg3_type = ARG_ANYTHING, | |
250 | }; | |
251 | ||
6ae08ae3 | 252 | static __always_inline int |
8d92db5c | 253 | bpf_probe_read_kernel_str_common(void *dst, u32 size, const void *unsafe_ptr) |
6ae08ae3 | 254 | { |
ff40e510 | 255 | int ret; |
8d92db5c | 256 | |
6ae08ae3 | 257 | /* |
8d92db5c CH |
258 | * The strncpy_from_kernel_nofault() call will likely not fill the |
259 | * entire buffer, but that's okay in this circumstance as we're probing | |
6ae08ae3 DB |
260 | * arbitrary memory anyway similar to bpf_probe_read_*() and might |
261 | * as well probe the stack. Thus, memory is explicitly cleared | |
262 | * only in error case, so that improper users ignoring return | |
263 | * code altogether don't copy garbage; otherwise length of string | |
264 | * is returned that can be used for bpf_perf_event_output() et al. | |
265 | */ | |
8d92db5c | 266 | ret = strncpy_from_kernel_nofault(dst, unsafe_ptr, size); |
6ae08ae3 | 267 | if (unlikely(ret < 0)) |
ff40e510 | 268 | memset(dst, 0, size); |
074f528e | 269 | return ret; |
2541517c AS |
270 | } |
271 | ||
6ae08ae3 DB |
272 | BPF_CALL_3(bpf_probe_read_kernel_str, void *, dst, u32, size, |
273 | const void *, unsafe_ptr) | |
274 | { | |
8d92db5c | 275 | return bpf_probe_read_kernel_str_common(dst, size, unsafe_ptr); |
6ae08ae3 DB |
276 | } |
277 | ||
f470378c | 278 | const struct bpf_func_proto bpf_probe_read_kernel_str_proto = { |
6ae08ae3 DB |
279 | .func = bpf_probe_read_kernel_str, |
280 | .gpl_only = true, | |
281 | .ret_type = RET_INTEGER, | |
282 | .arg1_type = ARG_PTR_TO_UNINIT_MEM, | |
283 | .arg2_type = ARG_CONST_SIZE_OR_ZERO, | |
284 | .arg3_type = ARG_ANYTHING, | |
285 | }; | |
286 | ||
8d92db5c CH |
287 | #ifdef CONFIG_ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE |
288 | BPF_CALL_3(bpf_probe_read_compat, void *, dst, u32, size, | |
289 | const void *, unsafe_ptr) | |
290 | { | |
291 | if ((unsigned long)unsafe_ptr < TASK_SIZE) { | |
292 | return bpf_probe_read_user_common(dst, size, | |
293 | (__force void __user *)unsafe_ptr); | |
294 | } | |
295 | return bpf_probe_read_kernel_common(dst, size, unsafe_ptr); | |
296 | } | |
297 | ||
298 | static const struct bpf_func_proto bpf_probe_read_compat_proto = { | |
299 | .func = bpf_probe_read_compat, | |
300 | .gpl_only = true, | |
301 | .ret_type = RET_INTEGER, | |
302 | .arg1_type = ARG_PTR_TO_UNINIT_MEM, | |
303 | .arg2_type = ARG_CONST_SIZE_OR_ZERO, | |
304 | .arg3_type = ARG_ANYTHING, | |
305 | }; | |
306 | ||
6ae08ae3 DB |
307 | BPF_CALL_3(bpf_probe_read_compat_str, void *, dst, u32, size, |
308 | const void *, unsafe_ptr) | |
309 | { | |
8d92db5c CH |
310 | if ((unsigned long)unsafe_ptr < TASK_SIZE) { |
311 | return bpf_probe_read_user_str_common(dst, size, | |
312 | (__force void __user *)unsafe_ptr); | |
313 | } | |
314 | return bpf_probe_read_kernel_str_common(dst, size, unsafe_ptr); | |
6ae08ae3 DB |
315 | } |
316 | ||
317 | static const struct bpf_func_proto bpf_probe_read_compat_str_proto = { | |
318 | .func = bpf_probe_read_compat_str, | |
2541517c AS |
319 | .gpl_only = true, |
320 | .ret_type = RET_INTEGER, | |
39f19ebb | 321 | .arg1_type = ARG_PTR_TO_UNINIT_MEM, |
9c019e2b | 322 | .arg2_type = ARG_CONST_SIZE_OR_ZERO, |
2541517c AS |
323 | .arg3_type = ARG_ANYTHING, |
324 | }; | |
8d92db5c | 325 | #endif /* CONFIG_ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE */ |
2541517c | 326 | |
eb1b6688 | 327 | BPF_CALL_3(bpf_probe_write_user, void __user *, unsafe_ptr, const void *, src, |
f3694e00 | 328 | u32, size) |
96ae5227 | 329 | { |
96ae5227 SD |
330 | /* |
331 | * Ensure we're in user context which is safe for the helper to | |
332 | * run. This helper has no business in a kthread. | |
333 | * | |
334 | * access_ok() should prevent writing to non-user memory, but in | |
335 | * some situations (nommu, temporary switch, etc) access_ok() does | |
336 | * not provide enough validation, hence the check on KERNEL_DS. | |
c7b6f29b NA |
337 | * |
338 | * nmi_uaccess_okay() ensures the probe is not run in an interim | |
339 | * state, when the task or mm are switched. This is specifically | |
340 | * required to prevent the use of temporary mm. | |
96ae5227 SD |
341 | */ |
342 | ||
343 | if (unlikely(in_interrupt() || | |
344 | current->flags & (PF_KTHREAD | PF_EXITING))) | |
345 | return -EPERM; | |
c7b6f29b NA |
346 | if (unlikely(!nmi_uaccess_okay())) |
347 | return -EPERM; | |
96ae5227 | 348 | |
c0ee37e8 | 349 | return copy_to_user_nofault(unsafe_ptr, src, size); |
96ae5227 SD |
350 | } |
351 | ||
352 | static const struct bpf_func_proto bpf_probe_write_user_proto = { | |
353 | .func = bpf_probe_write_user, | |
354 | .gpl_only = true, | |
355 | .ret_type = RET_INTEGER, | |
356 | .arg1_type = ARG_ANYTHING, | |
216e3cd2 | 357 | .arg2_type = ARG_PTR_TO_MEM | MEM_RDONLY, |
39f19ebb | 358 | .arg3_type = ARG_CONST_SIZE, |
96ae5227 SD |
359 | }; |
360 | ||
361 | static const struct bpf_func_proto *bpf_get_probe_write_proto(void) | |
362 | { | |
2c78ee89 AS |
363 | if (!capable(CAP_SYS_ADMIN)) |
364 | return NULL; | |
365 | ||
96ae5227 SD |
366 | pr_warn_ratelimited("%s[%d] is installing a program with bpf_probe_write_user helper that may corrupt user memory!", |
367 | current->comm, task_pid_nr(current)); | |
368 | ||
369 | return &bpf_probe_write_user_proto; | |
370 | } | |
371 | ||
d9c9e4db FR |
372 | #define MAX_TRACE_PRINTK_VARARGS 3 |
373 | #define BPF_TRACE_PRINTK_SIZE 1024 | |
ac5a72ea | 374 | |
d9c9e4db FR |
375 | BPF_CALL_5(bpf_trace_printk, char *, fmt, u32, fmt_size, u64, arg1, |
376 | u64, arg2, u64, arg3) | |
ac5a72ea | 377 | { |
d9c9e4db | 378 | u64 args[MAX_TRACE_PRINTK_VARARGS] = { arg1, arg2, arg3 }; |
78aa1cc9 JO |
379 | struct bpf_bprintf_data data = { |
380 | .get_bin_args = true, | |
e2bb9e01 | 381 | .get_buf = true, |
78aa1cc9 | 382 | }; |
ac5a72ea AM |
383 | int ret; |
384 | ||
78aa1cc9 JO |
385 | ret = bpf_bprintf_prepare(fmt, fmt_size, args, |
386 | MAX_TRACE_PRINTK_VARARGS, &data); | |
d9c9e4db FR |
387 | if (ret < 0) |
388 | return ret; | |
389 | ||
e2bb9e01 | 390 | ret = bstr_printf(data.buf, MAX_BPRINTF_BUF, fmt, data.bin_args); |
d9c9e4db | 391 | |
e2bb9e01 | 392 | trace_bpf_trace_printk(data.buf); |
ac5a72ea | 393 | |
f19a4050 | 394 | bpf_bprintf_cleanup(&data); |
9c959c86 | 395 | |
d9c9e4db | 396 | return ret; |
9c959c86 AS |
397 | } |
398 | ||
399 | static const struct bpf_func_proto bpf_trace_printk_proto = { | |
400 | .func = bpf_trace_printk, | |
401 | .gpl_only = true, | |
402 | .ret_type = RET_INTEGER, | |
216e3cd2 | 403 | .arg1_type = ARG_PTR_TO_MEM | MEM_RDONLY, |
39f19ebb | 404 | .arg2_type = ARG_CONST_SIZE, |
9c959c86 AS |
405 | }; |
406 | ||
10aceb62 | 407 | static void __set_printk_clr_event(void) |
0756ea3e AS |
408 | { |
409 | /* | |
ac5a72ea AM |
410 | * This program might be calling bpf_trace_printk, |
411 | * so enable the associated bpf_trace/bpf_trace_printk event. | |
412 | * Repeat this each time as it is possible a user has | |
413 | * disabled bpf_trace_printk events. By loading a program | |
414 | * calling bpf_trace_printk() however the user has expressed | |
415 | * the intent to see such events. | |
0756ea3e | 416 | */ |
ac5a72ea AM |
417 | if (trace_set_clr_event("bpf_trace", "bpf_trace_printk", 1)) |
418 | pr_warn_ratelimited("could not enable bpf_trace_printk events"); | |
10aceb62 | 419 | } |
0756ea3e | 420 | |
10aceb62 DM |
421 | const struct bpf_func_proto *bpf_get_trace_printk_proto(void) |
422 | { | |
423 | __set_printk_clr_event(); | |
0756ea3e AS |
424 | return &bpf_trace_printk_proto; |
425 | } | |
426 | ||
78aa1cc9 | 427 | BPF_CALL_4(bpf_trace_vprintk, char *, fmt, u32, fmt_size, const void *, args, |
10aceb62 DM |
428 | u32, data_len) |
429 | { | |
78aa1cc9 JO |
430 | struct bpf_bprintf_data data = { |
431 | .get_bin_args = true, | |
e2bb9e01 | 432 | .get_buf = true, |
78aa1cc9 | 433 | }; |
10aceb62 | 434 | int ret, num_args; |
10aceb62 DM |
435 | |
436 | if (data_len & 7 || data_len > MAX_BPRINTF_VARARGS * 8 || | |
78aa1cc9 | 437 | (data_len && !args)) |
10aceb62 DM |
438 | return -EINVAL; |
439 | num_args = data_len / 8; | |
440 | ||
78aa1cc9 | 441 | ret = bpf_bprintf_prepare(fmt, fmt_size, args, num_args, &data); |
10aceb62 DM |
442 | if (ret < 0) |
443 | return ret; | |
444 | ||
e2bb9e01 | 445 | ret = bstr_printf(data.buf, MAX_BPRINTF_BUF, fmt, data.bin_args); |
10aceb62 | 446 | |
e2bb9e01 | 447 | trace_bpf_trace_printk(data.buf); |
10aceb62 | 448 | |
f19a4050 | 449 | bpf_bprintf_cleanup(&data); |
10aceb62 DM |
450 | |
451 | return ret; | |
452 | } | |
453 | ||
454 | static const struct bpf_func_proto bpf_trace_vprintk_proto = { | |
455 | .func = bpf_trace_vprintk, | |
456 | .gpl_only = true, | |
457 | .ret_type = RET_INTEGER, | |
216e3cd2 | 458 | .arg1_type = ARG_PTR_TO_MEM | MEM_RDONLY, |
10aceb62 | 459 | .arg2_type = ARG_CONST_SIZE, |
216e3cd2 | 460 | .arg3_type = ARG_PTR_TO_MEM | PTR_MAYBE_NULL | MEM_RDONLY, |
10aceb62 DM |
461 | .arg4_type = ARG_CONST_SIZE_OR_ZERO, |
462 | }; | |
463 | ||
464 | const struct bpf_func_proto *bpf_get_trace_vprintk_proto(void) | |
465 | { | |
466 | __set_printk_clr_event(); | |
467 | return &bpf_trace_vprintk_proto; | |
468 | } | |
469 | ||
492e639f | 470 | BPF_CALL_5(bpf_seq_printf, struct seq_file *, m, char *, fmt, u32, fmt_size, |
78aa1cc9 | 471 | const void *, args, u32, data_len) |
492e639f | 472 | { |
78aa1cc9 JO |
473 | struct bpf_bprintf_data data = { |
474 | .get_bin_args = true, | |
475 | }; | |
d9c9e4db | 476 | int err, num_args; |
492e639f | 477 | |
335ff499 | 478 | if (data_len & 7 || data_len > MAX_BPRINTF_VARARGS * 8 || |
78aa1cc9 | 479 | (data_len && !args)) |
d9c9e4db | 480 | return -EINVAL; |
492e639f YS |
481 | num_args = data_len / 8; |
482 | ||
78aa1cc9 | 483 | err = bpf_bprintf_prepare(fmt, fmt_size, args, num_args, &data); |
d9c9e4db FR |
484 | if (err < 0) |
485 | return err; | |
492e639f | 486 | |
78aa1cc9 | 487 | seq_bprintf(m, fmt, data.bin_args); |
48cac3f4 | 488 | |
f19a4050 | 489 | bpf_bprintf_cleanup(&data); |
d9c9e4db FR |
490 | |
491 | return seq_has_overflowed(m) ? -EOVERFLOW : 0; | |
492e639f YS |
492 | } |
493 | ||
9436ef6e | 494 | BTF_ID_LIST_SINGLE(btf_seq_file_ids, struct, seq_file) |
c9a0f3b8 | 495 | |
492e639f YS |
496 | static const struct bpf_func_proto bpf_seq_printf_proto = { |
497 | .func = bpf_seq_printf, | |
498 | .gpl_only = true, | |
499 | .ret_type = RET_INTEGER, | |
500 | .arg1_type = ARG_PTR_TO_BTF_ID, | |
9436ef6e | 501 | .arg1_btf_id = &btf_seq_file_ids[0], |
216e3cd2 | 502 | .arg2_type = ARG_PTR_TO_MEM | MEM_RDONLY, |
492e639f | 503 | .arg3_type = ARG_CONST_SIZE, |
216e3cd2 | 504 | .arg4_type = ARG_PTR_TO_MEM | PTR_MAYBE_NULL | MEM_RDONLY, |
492e639f | 505 | .arg5_type = ARG_CONST_SIZE_OR_ZERO, |
492e639f YS |
506 | }; |
507 | ||
508 | BPF_CALL_3(bpf_seq_write, struct seq_file *, m, const void *, data, u32, len) | |
509 | { | |
510 | return seq_write(m, data, len) ? -EOVERFLOW : 0; | |
511 | } | |
512 | ||
492e639f YS |
513 | static const struct bpf_func_proto bpf_seq_write_proto = { |
514 | .func = bpf_seq_write, | |
515 | .gpl_only = true, | |
516 | .ret_type = RET_INTEGER, | |
517 | .arg1_type = ARG_PTR_TO_BTF_ID, | |
9436ef6e | 518 | .arg1_btf_id = &btf_seq_file_ids[0], |
216e3cd2 | 519 | .arg2_type = ARG_PTR_TO_MEM | MEM_RDONLY, |
492e639f | 520 | .arg3_type = ARG_CONST_SIZE_OR_ZERO, |
492e639f YS |
521 | }; |
522 | ||
eb411377 AM |
523 | BPF_CALL_4(bpf_seq_printf_btf, struct seq_file *, m, struct btf_ptr *, ptr, |
524 | u32, btf_ptr_size, u64, flags) | |
525 | { | |
526 | const struct btf *btf; | |
527 | s32 btf_id; | |
528 | int ret; | |
529 | ||
530 | ret = bpf_btf_printf_prepare(ptr, btf_ptr_size, flags, &btf, &btf_id); | |
531 | if (ret) | |
532 | return ret; | |
533 | ||
534 | return btf_type_seq_show_flags(btf, btf_id, ptr->ptr, m, flags); | |
535 | } | |
536 | ||
537 | static const struct bpf_func_proto bpf_seq_printf_btf_proto = { | |
538 | .func = bpf_seq_printf_btf, | |
539 | .gpl_only = true, | |
540 | .ret_type = RET_INTEGER, | |
541 | .arg1_type = ARG_PTR_TO_BTF_ID, | |
542 | .arg1_btf_id = &btf_seq_file_ids[0], | |
216e3cd2 | 543 | .arg2_type = ARG_PTR_TO_MEM | MEM_RDONLY, |
492e639f | 544 | .arg3_type = ARG_CONST_SIZE_OR_ZERO, |
eb411377 | 545 | .arg4_type = ARG_ANYTHING, |
492e639f YS |
546 | }; |
547 | ||
908432ca YS |
548 | static __always_inline int |
549 | get_map_perf_counter(struct bpf_map *map, u64 flags, | |
550 | u64 *value, u64 *enabled, u64 *running) | |
35578d79 | 551 | { |
35578d79 | 552 | struct bpf_array *array = container_of(map, struct bpf_array, map); |
6816a7ff DB |
553 | unsigned int cpu = smp_processor_id(); |
554 | u64 index = flags & BPF_F_INDEX_MASK; | |
3b1efb19 | 555 | struct bpf_event_entry *ee; |
35578d79 | 556 | |
6816a7ff DB |
557 | if (unlikely(flags & ~(BPF_F_INDEX_MASK))) |
558 | return -EINVAL; | |
559 | if (index == BPF_F_CURRENT_CPU) | |
560 | index = cpu; | |
35578d79 KX |
561 | if (unlikely(index >= array->map.max_entries)) |
562 | return -E2BIG; | |
563 | ||
3b1efb19 | 564 | ee = READ_ONCE(array->ptrs[index]); |
1ca1cc98 | 565 | if (!ee) |
35578d79 KX |
566 | return -ENOENT; |
567 | ||
908432ca YS |
568 | return perf_event_read_local(ee->event, value, enabled, running); |
569 | } | |
570 | ||
571 | BPF_CALL_2(bpf_perf_event_read, struct bpf_map *, map, u64, flags) | |
572 | { | |
573 | u64 value = 0; | |
574 | int err; | |
575 | ||
576 | err = get_map_perf_counter(map, flags, &value, NULL, NULL); | |
35578d79 | 577 | /* |
f91840a3 AS |
578 | * this api is ugly since we miss [-22..-2] range of valid |
579 | * counter values, but that's uapi | |
35578d79 | 580 | */ |
f91840a3 AS |
581 | if (err) |
582 | return err; | |
583 | return value; | |
35578d79 KX |
584 | } |
585 | ||
62544ce8 | 586 | static const struct bpf_func_proto bpf_perf_event_read_proto = { |
35578d79 | 587 | .func = bpf_perf_event_read, |
1075ef59 | 588 | .gpl_only = true, |
35578d79 KX |
589 | .ret_type = RET_INTEGER, |
590 | .arg1_type = ARG_CONST_MAP_PTR, | |
591 | .arg2_type = ARG_ANYTHING, | |
592 | }; | |
593 | ||
908432ca YS |
594 | BPF_CALL_4(bpf_perf_event_read_value, struct bpf_map *, map, u64, flags, |
595 | struct bpf_perf_event_value *, buf, u32, size) | |
596 | { | |
597 | int err = -EINVAL; | |
598 | ||
599 | if (unlikely(size != sizeof(struct bpf_perf_event_value))) | |
600 | goto clear; | |
601 | err = get_map_perf_counter(map, flags, &buf->counter, &buf->enabled, | |
602 | &buf->running); | |
603 | if (unlikely(err)) | |
604 | goto clear; | |
605 | return 0; | |
606 | clear: | |
607 | memset(buf, 0, size); | |
608 | return err; | |
609 | } | |
610 | ||
611 | static const struct bpf_func_proto bpf_perf_event_read_value_proto = { | |
612 | .func = bpf_perf_event_read_value, | |
613 | .gpl_only = true, | |
614 | .ret_type = RET_INTEGER, | |
615 | .arg1_type = ARG_CONST_MAP_PTR, | |
616 | .arg2_type = ARG_ANYTHING, | |
617 | .arg3_type = ARG_PTR_TO_UNINIT_MEM, | |
618 | .arg4_type = ARG_CONST_SIZE, | |
619 | }; | |
620 | ||
8e7a3920 DB |
621 | static __always_inline u64 |
622 | __bpf_perf_event_output(struct pt_regs *regs, struct bpf_map *map, | |
283ca526 | 623 | u64 flags, struct perf_sample_data *sd) |
a43eec30 | 624 | { |
a43eec30 | 625 | struct bpf_array *array = container_of(map, struct bpf_array, map); |
d7931330 | 626 | unsigned int cpu = smp_processor_id(); |
1e33759c | 627 | u64 index = flags & BPF_F_INDEX_MASK; |
3b1efb19 | 628 | struct bpf_event_entry *ee; |
a43eec30 | 629 | struct perf_event *event; |
a43eec30 | 630 | |
1e33759c | 631 | if (index == BPF_F_CURRENT_CPU) |
d7931330 | 632 | index = cpu; |
a43eec30 AS |
633 | if (unlikely(index >= array->map.max_entries)) |
634 | return -E2BIG; | |
635 | ||
3b1efb19 | 636 | ee = READ_ONCE(array->ptrs[index]); |
1ca1cc98 | 637 | if (!ee) |
a43eec30 AS |
638 | return -ENOENT; |
639 | ||
3b1efb19 | 640 | event = ee->event; |
a43eec30 AS |
641 | if (unlikely(event->attr.type != PERF_TYPE_SOFTWARE || |
642 | event->attr.config != PERF_COUNT_SW_BPF_OUTPUT)) | |
643 | return -EINVAL; | |
644 | ||
d7931330 | 645 | if (unlikely(event->oncpu != cpu)) |
a43eec30 AS |
646 | return -EOPNOTSUPP; |
647 | ||
56201969 | 648 | return perf_event_output(event, sd, regs); |
a43eec30 AS |
649 | } |
650 | ||
9594dc3c MM |
651 | /* |
652 | * Support executing tracepoints in normal, irq, and nmi context that each call | |
653 | * bpf_perf_event_output | |
654 | */ | |
655 | struct bpf_trace_sample_data { | |
656 | struct perf_sample_data sds[3]; | |
657 | }; | |
658 | ||
659 | static DEFINE_PER_CPU(struct bpf_trace_sample_data, bpf_trace_sds); | |
660 | static DEFINE_PER_CPU(int, bpf_trace_nest_level); | |
f3694e00 DB |
661 | BPF_CALL_5(bpf_perf_event_output, struct pt_regs *, regs, struct bpf_map *, map, |
662 | u64, flags, void *, data, u64, size) | |
8e7a3920 | 663 | { |
f2c67a3e | 664 | struct bpf_trace_sample_data *sds; |
8e7a3920 DB |
665 | struct perf_raw_record raw = { |
666 | .frag = { | |
667 | .size = size, | |
668 | .data = data, | |
669 | }, | |
670 | }; | |
9594dc3c | 671 | struct perf_sample_data *sd; |
f2c67a3e JO |
672 | int nest_level, err; |
673 | ||
674 | preempt_disable(); | |
675 | sds = this_cpu_ptr(&bpf_trace_sds); | |
676 | nest_level = this_cpu_inc_return(bpf_trace_nest_level); | |
8e7a3920 | 677 | |
9594dc3c MM |
678 | if (WARN_ON_ONCE(nest_level > ARRAY_SIZE(sds->sds))) { |
679 | err = -EBUSY; | |
680 | goto out; | |
681 | } | |
682 | ||
683 | sd = &sds->sds[nest_level - 1]; | |
684 | ||
685 | if (unlikely(flags & ~(BPF_F_INDEX_MASK))) { | |
686 | err = -EINVAL; | |
687 | goto out; | |
688 | } | |
8e7a3920 | 689 | |
283ca526 | 690 | perf_sample_data_init(sd, 0, 0); |
0a9081cf | 691 | perf_sample_save_raw_data(sd, &raw); |
283ca526 | 692 | |
9594dc3c | 693 | err = __bpf_perf_event_output(regs, map, flags, sd); |
9594dc3c MM |
694 | out: |
695 | this_cpu_dec(bpf_trace_nest_level); | |
f2c67a3e | 696 | preempt_enable(); |
9594dc3c | 697 | return err; |
8e7a3920 DB |
698 | } |
699 | ||
a43eec30 AS |
700 | static const struct bpf_func_proto bpf_perf_event_output_proto = { |
701 | .func = bpf_perf_event_output, | |
1075ef59 | 702 | .gpl_only = true, |
a43eec30 AS |
703 | .ret_type = RET_INTEGER, |
704 | .arg1_type = ARG_PTR_TO_CTX, | |
705 | .arg2_type = ARG_CONST_MAP_PTR, | |
706 | .arg3_type = ARG_ANYTHING, | |
216e3cd2 | 707 | .arg4_type = ARG_PTR_TO_MEM | MEM_RDONLY, |
a60dd35d | 708 | .arg5_type = ARG_CONST_SIZE_OR_ZERO, |
a43eec30 AS |
709 | }; |
710 | ||
768fb61f AZ |
711 | static DEFINE_PER_CPU(int, bpf_event_output_nest_level); |
712 | struct bpf_nested_pt_regs { | |
713 | struct pt_regs regs[3]; | |
714 | }; | |
715 | static DEFINE_PER_CPU(struct bpf_nested_pt_regs, bpf_pt_regs); | |
716 | static DEFINE_PER_CPU(struct bpf_trace_sample_data, bpf_misc_sds); | |
bd570ff9 | 717 | |
555c8a86 DB |
718 | u64 bpf_event_output(struct bpf_map *map, u64 flags, void *meta, u64 meta_size, |
719 | void *ctx, u64 ctx_size, bpf_ctx_copy_t ctx_copy) | |
bd570ff9 | 720 | { |
555c8a86 DB |
721 | struct perf_raw_frag frag = { |
722 | .copy = ctx_copy, | |
723 | .size = ctx_size, | |
724 | .data = ctx, | |
725 | }; | |
726 | struct perf_raw_record raw = { | |
727 | .frag = { | |
183fc153 AM |
728 | { |
729 | .next = ctx_size ? &frag : NULL, | |
730 | }, | |
555c8a86 DB |
731 | .size = meta_size, |
732 | .data = meta, | |
733 | }, | |
734 | }; | |
768fb61f AZ |
735 | struct perf_sample_data *sd; |
736 | struct pt_regs *regs; | |
d62cc390 | 737 | int nest_level; |
768fb61f AZ |
738 | u64 ret; |
739 | ||
d62cc390 JO |
740 | preempt_disable(); |
741 | nest_level = this_cpu_inc_return(bpf_event_output_nest_level); | |
742 | ||
768fb61f AZ |
743 | if (WARN_ON_ONCE(nest_level > ARRAY_SIZE(bpf_misc_sds.sds))) { |
744 | ret = -EBUSY; | |
745 | goto out; | |
746 | } | |
747 | sd = this_cpu_ptr(&bpf_misc_sds.sds[nest_level - 1]); | |
748 | regs = this_cpu_ptr(&bpf_pt_regs.regs[nest_level - 1]); | |
bd570ff9 DB |
749 | |
750 | perf_fetch_caller_regs(regs); | |
283ca526 | 751 | perf_sample_data_init(sd, 0, 0); |
0a9081cf | 752 | perf_sample_save_raw_data(sd, &raw); |
bd570ff9 | 753 | |
768fb61f AZ |
754 | ret = __bpf_perf_event_output(regs, map, flags, sd); |
755 | out: | |
756 | this_cpu_dec(bpf_event_output_nest_level); | |
d62cc390 | 757 | preempt_enable(); |
768fb61f | 758 | return ret; |
bd570ff9 DB |
759 | } |
760 | ||
f3694e00 | 761 | BPF_CALL_0(bpf_get_current_task) |
606274c5 AS |
762 | { |
763 | return (long) current; | |
764 | } | |
765 | ||
f470378c | 766 | const struct bpf_func_proto bpf_get_current_task_proto = { |
606274c5 AS |
767 | .func = bpf_get_current_task, |
768 | .gpl_only = true, | |
769 | .ret_type = RET_INTEGER, | |
770 | }; | |
771 | ||
3ca1032a KS |
772 | BPF_CALL_0(bpf_get_current_task_btf) |
773 | { | |
774 | return (unsigned long) current; | |
775 | } | |
776 | ||
a396eda5 | 777 | const struct bpf_func_proto bpf_get_current_task_btf_proto = { |
3ca1032a KS |
778 | .func = bpf_get_current_task_btf, |
779 | .gpl_only = true, | |
3f00c523 | 780 | .ret_type = RET_PTR_TO_BTF_ID_TRUSTED, |
d19ddb47 | 781 | .ret_btf_id = &btf_tracing_ids[BTF_TRACING_TYPE_TASK], |
3ca1032a KS |
782 | }; |
783 | ||
dd6e10fb DX |
784 | BPF_CALL_1(bpf_task_pt_regs, struct task_struct *, task) |
785 | { | |
786 | return (unsigned long) task_pt_regs(task); | |
787 | } | |
788 | ||
789 | BTF_ID_LIST(bpf_task_pt_regs_ids) | |
790 | BTF_ID(struct, pt_regs) | |
791 | ||
792 | const struct bpf_func_proto bpf_task_pt_regs_proto = { | |
793 | .func = bpf_task_pt_regs, | |
794 | .gpl_only = true, | |
795 | .arg1_type = ARG_PTR_TO_BTF_ID, | |
d19ddb47 | 796 | .arg1_btf_id = &btf_tracing_ids[BTF_TRACING_TYPE_TASK], |
dd6e10fb DX |
797 | .ret_type = RET_PTR_TO_BTF_ID, |
798 | .ret_btf_id = &bpf_task_pt_regs_ids[0], | |
799 | }; | |
800 | ||
f3694e00 | 801 | BPF_CALL_2(bpf_current_task_under_cgroup, struct bpf_map *, map, u32, idx) |
60d20f91 | 802 | { |
60d20f91 SD |
803 | struct bpf_array *array = container_of(map, struct bpf_array, map); |
804 | struct cgroup *cgrp; | |
60d20f91 | 805 | |
60d20f91 SD |
806 | if (unlikely(idx >= array->map.max_entries)) |
807 | return -E2BIG; | |
808 | ||
809 | cgrp = READ_ONCE(array->ptrs[idx]); | |
810 | if (unlikely(!cgrp)) | |
811 | return -EAGAIN; | |
812 | ||
813 | return task_under_cgroup_hierarchy(current, cgrp); | |
814 | } | |
815 | ||
816 | static const struct bpf_func_proto bpf_current_task_under_cgroup_proto = { | |
817 | .func = bpf_current_task_under_cgroup, | |
818 | .gpl_only = false, | |
819 | .ret_type = RET_INTEGER, | |
820 | .arg1_type = ARG_CONST_MAP_PTR, | |
821 | .arg2_type = ARG_ANYTHING, | |
822 | }; | |
823 | ||
8b401f9e YS |
824 | struct send_signal_irq_work { |
825 | struct irq_work irq_work; | |
826 | struct task_struct *task; | |
827 | u32 sig; | |
8482941f | 828 | enum pid_type type; |
8b401f9e YS |
829 | }; |
830 | ||
831 | static DEFINE_PER_CPU(struct send_signal_irq_work, send_signal_work); | |
832 | ||
833 | static void do_bpf_send_signal(struct irq_work *entry) | |
834 | { | |
835 | struct send_signal_irq_work *work; | |
836 | ||
837 | work = container_of(entry, struct send_signal_irq_work, irq_work); | |
8482941f | 838 | group_send_sig_info(work->sig, SEND_SIG_PRIV, work->task, work->type); |
bdb7fdb0 | 839 | put_task_struct(work->task); |
8b401f9e YS |
840 | } |
841 | ||
8482941f | 842 | static int bpf_send_signal_common(u32 sig, enum pid_type type) |
8b401f9e YS |
843 | { |
844 | struct send_signal_irq_work *work = NULL; | |
845 | ||
846 | /* Similar to bpf_probe_write_user, task needs to be | |
847 | * in a sound condition and kernel memory access be | |
848 | * permitted in order to send signal to the current | |
849 | * task. | |
850 | */ | |
851 | if (unlikely(current->flags & (PF_KTHREAD | PF_EXITING))) | |
852 | return -EPERM; | |
8b401f9e YS |
853 | if (unlikely(!nmi_uaccess_okay())) |
854 | return -EPERM; | |
a3d81bc1 HS |
855 | /* Task should not be pid=1 to avoid kernel panic. */ |
856 | if (unlikely(is_global_init(current))) | |
857 | return -EPERM; | |
8b401f9e | 858 | |
1bc7896e | 859 | if (irqs_disabled()) { |
e1afb702 YS |
860 | /* Do an early check on signal validity. Otherwise, |
861 | * the error is lost in deferred irq_work. | |
862 | */ | |
863 | if (unlikely(!valid_signal(sig))) | |
864 | return -EINVAL; | |
865 | ||
8b401f9e | 866 | work = this_cpu_ptr(&send_signal_work); |
7a9f50a0 | 867 | if (irq_work_is_busy(&work->irq_work)) |
8b401f9e YS |
868 | return -EBUSY; |
869 | ||
870 | /* Add the current task, which is the target of sending signal, | |
871 | * to the irq_work. The current task may change when queued | |
872 | * irq works get executed. | |
873 | */ | |
bdb7fdb0 | 874 | work->task = get_task_struct(current); |
8b401f9e | 875 | work->sig = sig; |
8482941f | 876 | work->type = type; |
8b401f9e YS |
877 | irq_work_queue(&work->irq_work); |
878 | return 0; | |
879 | } | |
880 | ||
8482941f YS |
881 | return group_send_sig_info(sig, SEND_SIG_PRIV, current, type); |
882 | } | |
883 | ||
884 | BPF_CALL_1(bpf_send_signal, u32, sig) | |
885 | { | |
886 | return bpf_send_signal_common(sig, PIDTYPE_TGID); | |
8b401f9e YS |
887 | } |
888 | ||
889 | static const struct bpf_func_proto bpf_send_signal_proto = { | |
890 | .func = bpf_send_signal, | |
891 | .gpl_only = false, | |
892 | .ret_type = RET_INTEGER, | |
893 | .arg1_type = ARG_ANYTHING, | |
894 | }; | |
895 | ||
8482941f YS |
896 | BPF_CALL_1(bpf_send_signal_thread, u32, sig) |
897 | { | |
898 | return bpf_send_signal_common(sig, PIDTYPE_PID); | |
899 | } | |
900 | ||
901 | static const struct bpf_func_proto bpf_send_signal_thread_proto = { | |
902 | .func = bpf_send_signal_thread, | |
903 | .gpl_only = false, | |
904 | .ret_type = RET_INTEGER, | |
905 | .arg1_type = ARG_ANYTHING, | |
906 | }; | |
907 | ||
6e22ab9d JO |
908 | BPF_CALL_3(bpf_d_path, struct path *, path, char *, buf, u32, sz) |
909 | { | |
f46fab0e | 910 | struct path copy; |
6e22ab9d JO |
911 | long len; |
912 | char *p; | |
913 | ||
914 | if (!sz) | |
915 | return 0; | |
916 | ||
f46fab0e JO |
917 | /* |
918 | * The path pointer is verified as trusted and safe to use, | |
919 | * but let's double check it's valid anyway to workaround | |
920 | * potentially broken verifier. | |
921 | */ | |
922 | len = copy_from_kernel_nofault(©, path, sizeof(*path)); | |
923 | if (len < 0) | |
924 | return len; | |
925 | ||
926 | p = d_path(©, buf, sz); | |
6e22ab9d JO |
927 | if (IS_ERR(p)) { |
928 | len = PTR_ERR(p); | |
929 | } else { | |
930 | len = buf + sz - p; | |
931 | memmove(buf, p, len); | |
932 | } | |
933 | ||
934 | return len; | |
935 | } | |
936 | ||
937 | BTF_SET_START(btf_allowlist_d_path) | |
a8a71796 JO |
938 | #ifdef CONFIG_SECURITY |
939 | BTF_ID(func, security_file_permission) | |
940 | BTF_ID(func, security_inode_getattr) | |
941 | BTF_ID(func, security_file_open) | |
942 | #endif | |
943 | #ifdef CONFIG_SECURITY_PATH | |
944 | BTF_ID(func, security_path_truncate) | |
945 | #endif | |
6e22ab9d JO |
946 | BTF_ID(func, vfs_truncate) |
947 | BTF_ID(func, vfs_fallocate) | |
948 | BTF_ID(func, dentry_open) | |
949 | BTF_ID(func, vfs_getattr) | |
950 | BTF_ID(func, filp_close) | |
951 | BTF_SET_END(btf_allowlist_d_path) | |
952 | ||
953 | static bool bpf_d_path_allowed(const struct bpf_prog *prog) | |
954 | { | |
3d06f34a SL |
955 | if (prog->type == BPF_PROG_TYPE_TRACING && |
956 | prog->expected_attach_type == BPF_TRACE_ITER) | |
957 | return true; | |
958 | ||
6f100640 KS |
959 | if (prog->type == BPF_PROG_TYPE_LSM) |
960 | return bpf_lsm_is_sleepable_hook(prog->aux->attach_btf_id); | |
961 | ||
962 | return btf_id_set_contains(&btf_allowlist_d_path, | |
963 | prog->aux->attach_btf_id); | |
6e22ab9d JO |
964 | } |
965 | ||
9436ef6e | 966 | BTF_ID_LIST_SINGLE(bpf_d_path_btf_ids, struct, path) |
6e22ab9d JO |
967 | |
968 | static const struct bpf_func_proto bpf_d_path_proto = { | |
969 | .func = bpf_d_path, | |
970 | .gpl_only = false, | |
971 | .ret_type = RET_INTEGER, | |
972 | .arg1_type = ARG_PTR_TO_BTF_ID, | |
9436ef6e | 973 | .arg1_btf_id = &bpf_d_path_btf_ids[0], |
6e22ab9d JO |
974 | .arg2_type = ARG_PTR_TO_MEM, |
975 | .arg3_type = ARG_CONST_SIZE_OR_ZERO, | |
6e22ab9d JO |
976 | .allowed = bpf_d_path_allowed, |
977 | }; | |
978 | ||
c4d0bfb4 AM |
979 | #define BTF_F_ALL (BTF_F_COMPACT | BTF_F_NONAME | \ |
980 | BTF_F_PTR_RAW | BTF_F_ZERO) | |
981 | ||
982 | static int bpf_btf_printf_prepare(struct btf_ptr *ptr, u32 btf_ptr_size, | |
983 | u64 flags, const struct btf **btf, | |
984 | s32 *btf_id) | |
985 | { | |
986 | const struct btf_type *t; | |
987 | ||
988 | if (unlikely(flags & ~(BTF_F_ALL))) | |
989 | return -EINVAL; | |
990 | ||
991 | if (btf_ptr_size != sizeof(struct btf_ptr)) | |
992 | return -EINVAL; | |
993 | ||
994 | *btf = bpf_get_btf_vmlinux(); | |
995 | ||
996 | if (IS_ERR_OR_NULL(*btf)) | |
abbaa433 | 997 | return IS_ERR(*btf) ? PTR_ERR(*btf) : -EINVAL; |
c4d0bfb4 AM |
998 | |
999 | if (ptr->type_id > 0) | |
1000 | *btf_id = ptr->type_id; | |
1001 | else | |
1002 | return -EINVAL; | |
1003 | ||
1004 | if (*btf_id > 0) | |
1005 | t = btf_type_by_id(*btf, *btf_id); | |
1006 | if (*btf_id <= 0 || !t) | |
1007 | return -ENOENT; | |
1008 | ||
1009 | return 0; | |
1010 | } | |
1011 | ||
1012 | BPF_CALL_5(bpf_snprintf_btf, char *, str, u32, str_size, struct btf_ptr *, ptr, | |
1013 | u32, btf_ptr_size, u64, flags) | |
1014 | { | |
1015 | const struct btf *btf; | |
1016 | s32 btf_id; | |
1017 | int ret; | |
1018 | ||
1019 | ret = bpf_btf_printf_prepare(ptr, btf_ptr_size, flags, &btf, &btf_id); | |
1020 | if (ret) | |
1021 | return ret; | |
1022 | ||
1023 | return btf_type_snprintf_show(btf, btf_id, ptr->ptr, str, str_size, | |
1024 | flags); | |
1025 | } | |
1026 | ||
1027 | const struct bpf_func_proto bpf_snprintf_btf_proto = { | |
1028 | .func = bpf_snprintf_btf, | |
1029 | .gpl_only = false, | |
1030 | .ret_type = RET_INTEGER, | |
1031 | .arg1_type = ARG_PTR_TO_MEM, | |
1032 | .arg2_type = ARG_CONST_SIZE, | |
216e3cd2 | 1033 | .arg3_type = ARG_PTR_TO_MEM | MEM_RDONLY, |
c4d0bfb4 AM |
1034 | .arg4_type = ARG_CONST_SIZE, |
1035 | .arg5_type = ARG_ANYTHING, | |
1036 | }; | |
1037 | ||
9b99edca JO |
1038 | BPF_CALL_1(bpf_get_func_ip_tracing, void *, ctx) |
1039 | { | |
1040 | /* This helper call is inlined by verifier. */ | |
f92c1e18 | 1041 | return ((u64 *)ctx)[-2]; |
9b99edca JO |
1042 | } |
1043 | ||
1044 | static const struct bpf_func_proto bpf_get_func_ip_proto_tracing = { | |
1045 | .func = bpf_get_func_ip_tracing, | |
1046 | .gpl_only = true, | |
1047 | .ret_type = RET_INTEGER, | |
1048 | .arg1_type = ARG_PTR_TO_CTX, | |
1049 | }; | |
1050 | ||
c09eb2e5 JO |
1051 | #ifdef CONFIG_X86_KERNEL_IBT |
1052 | static unsigned long get_entry_ip(unsigned long fentry_ip) | |
1053 | { | |
1054 | u32 instr; | |
1055 | ||
a8497506 AN |
1056 | /* We want to be extra safe in case entry ip is on the page edge, |
1057 | * but otherwise we need to avoid get_kernel_nofault()'s overhead. | |
1058 | */ | |
1059 | if ((fentry_ip & ~PAGE_MASK) < ENDBR_INSN_SIZE) { | |
1060 | if (get_kernel_nofault(instr, (u32 *)(fentry_ip - ENDBR_INSN_SIZE))) | |
1061 | return fentry_ip; | |
1062 | } else { | |
1063 | instr = *(u32 *)(fentry_ip - ENDBR_INSN_SIZE); | |
1064 | } | |
c09eb2e5 JO |
1065 | if (is_endbr(instr)) |
1066 | fentry_ip -= ENDBR_INSN_SIZE; | |
1067 | return fentry_ip; | |
1068 | } | |
1069 | #else | |
1070 | #define get_entry_ip(fentry_ip) fentry_ip | |
1071 | #endif | |
1072 | ||
9ffd9f3f JO |
1073 | BPF_CALL_1(bpf_get_func_ip_kprobe, struct pt_regs *, regs) |
1074 | { | |
a3c485a5 JO |
1075 | struct bpf_trace_run_ctx *run_ctx __maybe_unused; |
1076 | struct kprobe *kp; | |
1077 | ||
1078 | #ifdef CONFIG_UPROBES | |
1079 | run_ctx = container_of(current->bpf_ctx, struct bpf_trace_run_ctx, run_ctx); | |
1080 | if (run_ctx->is_uprobe) | |
1081 | return ((struct uprobe_dispatch_data *)current->utask->vaddr)->bp_addr; | |
1082 | #endif | |
1083 | ||
1084 | kp = kprobe_running(); | |
9ffd9f3f | 1085 | |
0e253f7e JO |
1086 | if (!kp || !(kp->flags & KPROBE_FLAG_ON_FUNC_ENTRY)) |
1087 | return 0; | |
1088 | ||
1089 | return get_entry_ip((uintptr_t)kp->addr); | |
9ffd9f3f JO |
1090 | } |
1091 | ||
1092 | static const struct bpf_func_proto bpf_get_func_ip_proto_kprobe = { | |
1093 | .func = bpf_get_func_ip_kprobe, | |
1094 | .gpl_only = true, | |
1095 | .ret_type = RET_INTEGER, | |
1096 | .arg1_type = ARG_PTR_TO_CTX, | |
1097 | }; | |
1098 | ||
42a57120 JO |
1099 | BPF_CALL_1(bpf_get_func_ip_kprobe_multi, struct pt_regs *, regs) |
1100 | { | |
f7098690 | 1101 | return bpf_kprobe_multi_entry_ip(current->bpf_ctx); |
42a57120 JO |
1102 | } |
1103 | ||
1104 | static const struct bpf_func_proto bpf_get_func_ip_proto_kprobe_multi = { | |
1105 | .func = bpf_get_func_ip_kprobe_multi, | |
1106 | .gpl_only = false, | |
1107 | .ret_type = RET_INTEGER, | |
1108 | .arg1_type = ARG_PTR_TO_CTX, | |
1109 | }; | |
1110 | ||
ca74823c JO |
1111 | BPF_CALL_1(bpf_get_attach_cookie_kprobe_multi, struct pt_regs *, regs) |
1112 | { | |
f7098690 | 1113 | return bpf_kprobe_multi_cookie(current->bpf_ctx); |
ca74823c JO |
1114 | } |
1115 | ||
1116 | static const struct bpf_func_proto bpf_get_attach_cookie_proto_kmulti = { | |
1117 | .func = bpf_get_attach_cookie_kprobe_multi, | |
1118 | .gpl_only = false, | |
1119 | .ret_type = RET_INTEGER, | |
1120 | .arg1_type = ARG_PTR_TO_CTX, | |
1121 | }; | |
1122 | ||
686328d8 JO |
1123 | BPF_CALL_1(bpf_get_func_ip_uprobe_multi, struct pt_regs *, regs) |
1124 | { | |
1125 | return bpf_uprobe_multi_entry_ip(current->bpf_ctx); | |
1126 | } | |
1127 | ||
1128 | static const struct bpf_func_proto bpf_get_func_ip_proto_uprobe_multi = { | |
1129 | .func = bpf_get_func_ip_uprobe_multi, | |
1130 | .gpl_only = false, | |
1131 | .ret_type = RET_INTEGER, | |
1132 | .arg1_type = ARG_PTR_TO_CTX, | |
1133 | }; | |
1134 | ||
0b779b61 JO |
1135 | BPF_CALL_1(bpf_get_attach_cookie_uprobe_multi, struct pt_regs *, regs) |
1136 | { | |
1137 | return bpf_uprobe_multi_cookie(current->bpf_ctx); | |
1138 | } | |
1139 | ||
1140 | static const struct bpf_func_proto bpf_get_attach_cookie_proto_umulti = { | |
1141 | .func = bpf_get_attach_cookie_uprobe_multi, | |
1142 | .gpl_only = false, | |
1143 | .ret_type = RET_INTEGER, | |
1144 | .arg1_type = ARG_PTR_TO_CTX, | |
1145 | }; | |
1146 | ||
7adfc6c9 AN |
1147 | BPF_CALL_1(bpf_get_attach_cookie_trace, void *, ctx) |
1148 | { | |
1149 | struct bpf_trace_run_ctx *run_ctx; | |
1150 | ||
1151 | run_ctx = container_of(current->bpf_ctx, struct bpf_trace_run_ctx, run_ctx); | |
1152 | return run_ctx->bpf_cookie; | |
1153 | } | |
1154 | ||
1155 | static const struct bpf_func_proto bpf_get_attach_cookie_proto_trace = { | |
1156 | .func = bpf_get_attach_cookie_trace, | |
1157 | .gpl_only = false, | |
1158 | .ret_type = RET_INTEGER, | |
1159 | .arg1_type = ARG_PTR_TO_CTX, | |
1160 | }; | |
1161 | ||
1162 | BPF_CALL_1(bpf_get_attach_cookie_pe, struct bpf_perf_event_data_kern *, ctx) | |
1163 | { | |
1164 | return ctx->event->bpf_cookie; | |
1165 | } | |
1166 | ||
1167 | static const struct bpf_func_proto bpf_get_attach_cookie_proto_pe = { | |
1168 | .func = bpf_get_attach_cookie_pe, | |
1169 | .gpl_only = false, | |
1170 | .ret_type = RET_INTEGER, | |
1171 | .arg1_type = ARG_PTR_TO_CTX, | |
1172 | }; | |
1173 | ||
2fcc8241 KFL |
1174 | BPF_CALL_1(bpf_get_attach_cookie_tracing, void *, ctx) |
1175 | { | |
1176 | struct bpf_trace_run_ctx *run_ctx; | |
1177 | ||
1178 | run_ctx = container_of(current->bpf_ctx, struct bpf_trace_run_ctx, run_ctx); | |
1179 | return run_ctx->bpf_cookie; | |
1180 | } | |
1181 | ||
1182 | static const struct bpf_func_proto bpf_get_attach_cookie_proto_tracing = { | |
1183 | .func = bpf_get_attach_cookie_tracing, | |
1184 | .gpl_only = false, | |
1185 | .ret_type = RET_INTEGER, | |
1186 | .arg1_type = ARG_PTR_TO_CTX, | |
1187 | }; | |
1188 | ||
856c02db SL |
1189 | BPF_CALL_3(bpf_get_branch_snapshot, void *, buf, u32, size, u64, flags) |
1190 | { | |
856c02db SL |
1191 | static const u32 br_entry_size = sizeof(struct perf_branch_entry); |
1192 | u32 entry_cnt = size / br_entry_size; | |
1193 | ||
1194 | entry_cnt = static_call(perf_snapshot_branch_stack)(buf, entry_cnt); | |
1195 | ||
1196 | if (unlikely(flags)) | |
1197 | return -EINVAL; | |
1198 | ||
1199 | if (!entry_cnt) | |
1200 | return -ENOENT; | |
1201 | ||
1202 | return entry_cnt * br_entry_size; | |
856c02db SL |
1203 | } |
1204 | ||
1205 | static const struct bpf_func_proto bpf_get_branch_snapshot_proto = { | |
1206 | .func = bpf_get_branch_snapshot, | |
1207 | .gpl_only = true, | |
1208 | .ret_type = RET_INTEGER, | |
1209 | .arg1_type = ARG_PTR_TO_UNINIT_MEM, | |
1210 | .arg2_type = ARG_CONST_SIZE_OR_ZERO, | |
1211 | }; | |
1212 | ||
f92c1e18 JO |
1213 | BPF_CALL_3(get_func_arg, void *, ctx, u32, n, u64 *, value) |
1214 | { | |
1215 | /* This helper call is inlined by verifier. */ | |
1216 | u64 nr_args = ((u64 *)ctx)[-1]; | |
1217 | ||
1218 | if ((u64) n >= nr_args) | |
1219 | return -EINVAL; | |
1220 | *value = ((u64 *)ctx)[n]; | |
1221 | return 0; | |
1222 | } | |
1223 | ||
1224 | static const struct bpf_func_proto bpf_get_func_arg_proto = { | |
1225 | .func = get_func_arg, | |
1226 | .ret_type = RET_INTEGER, | |
1227 | .arg1_type = ARG_PTR_TO_CTX, | |
1228 | .arg2_type = ARG_ANYTHING, | |
1229 | .arg3_type = ARG_PTR_TO_LONG, | |
1230 | }; | |
1231 | ||
1232 | BPF_CALL_2(get_func_ret, void *, ctx, u64 *, value) | |
1233 | { | |
1234 | /* This helper call is inlined by verifier. */ | |
1235 | u64 nr_args = ((u64 *)ctx)[-1]; | |
1236 | ||
1237 | *value = ((u64 *)ctx)[nr_args]; | |
1238 | return 0; | |
1239 | } | |
1240 | ||
1241 | static const struct bpf_func_proto bpf_get_func_ret_proto = { | |
1242 | .func = get_func_ret, | |
1243 | .ret_type = RET_INTEGER, | |
1244 | .arg1_type = ARG_PTR_TO_CTX, | |
1245 | .arg2_type = ARG_PTR_TO_LONG, | |
1246 | }; | |
1247 | ||
1248 | BPF_CALL_1(get_func_arg_cnt, void *, ctx) | |
1249 | { | |
1250 | /* This helper call is inlined by verifier. */ | |
1251 | return ((u64 *)ctx)[-1]; | |
1252 | } | |
1253 | ||
1254 | static const struct bpf_func_proto bpf_get_func_arg_cnt_proto = { | |
1255 | .func = get_func_arg_cnt, | |
1256 | .ret_type = RET_INTEGER, | |
1257 | .arg1_type = ARG_PTR_TO_CTX, | |
1258 | }; | |
1259 | ||
f3cf4134 | 1260 | #ifdef CONFIG_KEYS |
391145ba | 1261 | __bpf_kfunc_start_defs(); |
f3cf4134 RS |
1262 | |
1263 | /** | |
1264 | * bpf_lookup_user_key - lookup a key by its serial | |
1265 | * @serial: key handle serial number | |
1266 | * @flags: lookup-specific flags | |
1267 | * | |
1268 | * Search a key with a given *serial* and the provided *flags*. | |
1269 | * If found, increment the reference count of the key by one, and | |
1270 | * return it in the bpf_key structure. | |
1271 | * | |
1272 | * The bpf_key structure must be passed to bpf_key_put() when done | |
1273 | * with it, so that the key reference count is decremented and the | |
1274 | * bpf_key structure is freed. | |
1275 | * | |
1276 | * Permission checks are deferred to the time the key is used by | |
1277 | * one of the available key-specific kfuncs. | |
1278 | * | |
1279 | * Set *flags* with KEY_LOOKUP_CREATE, to attempt creating a requested | |
1280 | * special keyring (e.g. session keyring), if it doesn't yet exist. | |
1281 | * Set *flags* with KEY_LOOKUP_PARTIAL, to lookup a key without waiting | |
1282 | * for the key construction, and to retrieve uninstantiated keys (keys | |
1283 | * without data attached to them). | |
1284 | * | |
1285 | * Return: a bpf_key pointer with a valid key pointer if the key is found, a | |
1286 | * NULL pointer otherwise. | |
1287 | */ | |
400031e0 | 1288 | __bpf_kfunc struct bpf_key *bpf_lookup_user_key(u32 serial, u64 flags) |
f3cf4134 RS |
1289 | { |
1290 | key_ref_t key_ref; | |
1291 | struct bpf_key *bkey; | |
1292 | ||
1293 | if (flags & ~KEY_LOOKUP_ALL) | |
1294 | return NULL; | |
1295 | ||
1296 | /* | |
1297 | * Permission check is deferred until the key is used, as the | |
1298 | * intent of the caller is unknown here. | |
1299 | */ | |
1300 | key_ref = lookup_user_key(serial, flags, KEY_DEFER_PERM_CHECK); | |
1301 | if (IS_ERR(key_ref)) | |
1302 | return NULL; | |
1303 | ||
1304 | bkey = kmalloc(sizeof(*bkey), GFP_KERNEL); | |
1305 | if (!bkey) { | |
1306 | key_put(key_ref_to_ptr(key_ref)); | |
1307 | return NULL; | |
1308 | } | |
1309 | ||
1310 | bkey->key = key_ref_to_ptr(key_ref); | |
1311 | bkey->has_ref = true; | |
1312 | ||
1313 | return bkey; | |
1314 | } | |
1315 | ||
1316 | /** | |
1317 | * bpf_lookup_system_key - lookup a key by a system-defined ID | |
1318 | * @id: key ID | |
1319 | * | |
1320 | * Obtain a bpf_key structure with a key pointer set to the passed key ID. | |
1321 | * The key pointer is marked as invalid, to prevent bpf_key_put() from | |
1322 | * attempting to decrement the key reference count on that pointer. The key | |
1323 | * pointer set in such way is currently understood only by | |
1324 | * verify_pkcs7_signature(). | |
1325 | * | |
1326 | * Set *id* to one of the values defined in include/linux/verification.h: | |
1327 | * 0 for the primary keyring (immutable keyring of system keys); | |
1328 | * VERIFY_USE_SECONDARY_KEYRING for both the primary and secondary keyring | |
1329 | * (where keys can be added only if they are vouched for by existing keys | |
1330 | * in those keyrings); VERIFY_USE_PLATFORM_KEYRING for the platform | |
1331 | * keyring (primarily used by the integrity subsystem to verify a kexec'ed | |
1332 | * kerned image and, possibly, the initramfs signature). | |
1333 | * | |
1334 | * Return: a bpf_key pointer with an invalid key pointer set from the | |
1335 | * pre-determined ID on success, a NULL pointer otherwise | |
1336 | */ | |
400031e0 | 1337 | __bpf_kfunc struct bpf_key *bpf_lookup_system_key(u64 id) |
f3cf4134 RS |
1338 | { |
1339 | struct bpf_key *bkey; | |
1340 | ||
1341 | if (system_keyring_id_check(id) < 0) | |
1342 | return NULL; | |
1343 | ||
1344 | bkey = kmalloc(sizeof(*bkey), GFP_ATOMIC); | |
1345 | if (!bkey) | |
1346 | return NULL; | |
1347 | ||
1348 | bkey->key = (struct key *)(unsigned long)id; | |
1349 | bkey->has_ref = false; | |
1350 | ||
1351 | return bkey; | |
1352 | } | |
1353 | ||
1354 | /** | |
1355 | * bpf_key_put - decrement key reference count if key is valid and free bpf_key | |
1356 | * @bkey: bpf_key structure | |
1357 | * | |
1358 | * Decrement the reference count of the key inside *bkey*, if the pointer | |
1359 | * is valid, and free *bkey*. | |
1360 | */ | |
400031e0 | 1361 | __bpf_kfunc void bpf_key_put(struct bpf_key *bkey) |
f3cf4134 RS |
1362 | { |
1363 | if (bkey->has_ref) | |
1364 | key_put(bkey->key); | |
1365 | ||
1366 | kfree(bkey); | |
1367 | } | |
1368 | ||
865b0566 RS |
1369 | #ifdef CONFIG_SYSTEM_DATA_VERIFICATION |
1370 | /** | |
1371 | * bpf_verify_pkcs7_signature - verify a PKCS#7 signature | |
1372 | * @data_ptr: data to verify | |
1373 | * @sig_ptr: signature of the data | |
1374 | * @trusted_keyring: keyring with keys trusted for signature verification | |
1375 | * | |
1376 | * Verify the PKCS#7 signature *sig_ptr* against the supplied *data_ptr* | |
1377 | * with keys in a keyring referenced by *trusted_keyring*. | |
1378 | * | |
1379 | * Return: 0 on success, a negative value on error. | |
1380 | */ | |
400031e0 | 1381 | __bpf_kfunc int bpf_verify_pkcs7_signature(struct bpf_dynptr_kern *data_ptr, |
865b0566 RS |
1382 | struct bpf_dynptr_kern *sig_ptr, |
1383 | struct bpf_key *trusted_keyring) | |
1384 | { | |
74523c06 SL |
1385 | const void *data, *sig; |
1386 | u32 data_len, sig_len; | |
865b0566 RS |
1387 | int ret; |
1388 | ||
1389 | if (trusted_keyring->has_ref) { | |
1390 | /* | |
1391 | * Do the permission check deferred in bpf_lookup_user_key(). | |
1392 | * See bpf_lookup_user_key() for more details. | |
1393 | * | |
1394 | * A call to key_task_permission() here would be redundant, as | |
1395 | * it is already done by keyring_search() called by | |
1396 | * find_asymmetric_key(). | |
1397 | */ | |
1398 | ret = key_validate(trusted_keyring->key); | |
1399 | if (ret < 0) | |
1400 | return ret; | |
1401 | } | |
1402 | ||
74523c06 SL |
1403 | data_len = __bpf_dynptr_size(data_ptr); |
1404 | data = __bpf_dynptr_data(data_ptr, data_len); | |
1405 | sig_len = __bpf_dynptr_size(sig_ptr); | |
1406 | sig = __bpf_dynptr_data(sig_ptr, sig_len); | |
1407 | ||
1408 | return verify_pkcs7_signature(data, data_len, sig, sig_len, | |
865b0566 RS |
1409 | trusted_keyring->key, |
1410 | VERIFYING_UNSPECIFIED_SIGNATURE, NULL, | |
1411 | NULL); | |
1412 | } | |
1413 | #endif /* CONFIG_SYSTEM_DATA_VERIFICATION */ | |
1414 | ||
391145ba | 1415 | __bpf_kfunc_end_defs(); |
f3cf4134 | 1416 | |
6f3189f3 | 1417 | BTF_KFUNCS_START(key_sig_kfunc_set) |
f3cf4134 RS |
1418 | BTF_ID_FLAGS(func, bpf_lookup_user_key, KF_ACQUIRE | KF_RET_NULL | KF_SLEEPABLE) |
1419 | BTF_ID_FLAGS(func, bpf_lookup_system_key, KF_ACQUIRE | KF_RET_NULL) | |
1420 | BTF_ID_FLAGS(func, bpf_key_put, KF_RELEASE) | |
865b0566 RS |
1421 | #ifdef CONFIG_SYSTEM_DATA_VERIFICATION |
1422 | BTF_ID_FLAGS(func, bpf_verify_pkcs7_signature, KF_SLEEPABLE) | |
1423 | #endif | |
6f3189f3 | 1424 | BTF_KFUNCS_END(key_sig_kfunc_set) |
f3cf4134 RS |
1425 | |
1426 | static const struct btf_kfunc_id_set bpf_key_sig_kfunc_set = { | |
1427 | .owner = THIS_MODULE, | |
1428 | .set = &key_sig_kfunc_set, | |
1429 | }; | |
1430 | ||
1431 | static int __init bpf_key_sig_kfuncs_init(void) | |
1432 | { | |
1433 | return register_btf_kfunc_id_set(BPF_PROG_TYPE_TRACING, | |
1434 | &bpf_key_sig_kfunc_set); | |
1435 | } | |
1436 | ||
1437 | late_initcall(bpf_key_sig_kfuncs_init); | |
1438 | #endif /* CONFIG_KEYS */ | |
1439 | ||
ac9c05e0 SL |
1440 | /* filesystem kfuncs */ |
1441 | __bpf_kfunc_start_defs(); | |
1442 | ||
1443 | /** | |
1444 | * bpf_get_file_xattr - get xattr of a file | |
1445 | * @file: file to get xattr from | |
1446 | * @name__str: name of the xattr | |
1447 | * @value_ptr: output buffer of the xattr value | |
1448 | * | |
1449 | * Get xattr *name__str* of *file* and store the output in *value_ptr*. | |
1450 | * | |
1451 | * For security reasons, only *name__str* with prefix "user." is allowed. | |
1452 | * | |
1453 | * Return: 0 on success, a negative value on error. | |
1454 | */ | |
1455 | __bpf_kfunc int bpf_get_file_xattr(struct file *file, const char *name__str, | |
1456 | struct bpf_dynptr_kern *value_ptr) | |
1457 | { | |
1458 | struct dentry *dentry; | |
1459 | u32 value_len; | |
1460 | void *value; | |
1461 | int ret; | |
1462 | ||
1463 | if (strncmp(name__str, XATTR_USER_PREFIX, XATTR_USER_PREFIX_LEN)) | |
1464 | return -EPERM; | |
1465 | ||
1466 | value_len = __bpf_dynptr_size(value_ptr); | |
1467 | value = __bpf_dynptr_data_rw(value_ptr, value_len); | |
1468 | if (!value) | |
1469 | return -EINVAL; | |
1470 | ||
1471 | dentry = file_dentry(file); | |
1472 | ret = inode_permission(&nop_mnt_idmap, dentry->d_inode, MAY_READ); | |
1473 | if (ret) | |
1474 | return ret; | |
1475 | return __vfs_getxattr(dentry, dentry->d_inode, name__str, value, value_len); | |
1476 | } | |
1477 | ||
1478 | __bpf_kfunc_end_defs(); | |
1479 | ||
6f3189f3 | 1480 | BTF_KFUNCS_START(fs_kfunc_set_ids) |
ac9c05e0 | 1481 | BTF_ID_FLAGS(func, bpf_get_file_xattr, KF_SLEEPABLE | KF_TRUSTED_ARGS) |
6f3189f3 | 1482 | BTF_KFUNCS_END(fs_kfunc_set_ids) |
ac9c05e0 SL |
1483 | |
1484 | static int bpf_get_file_xattr_filter(const struct bpf_prog *prog, u32 kfunc_id) | |
1485 | { | |
1486 | if (!btf_id_set8_contains(&fs_kfunc_set_ids, kfunc_id)) | |
1487 | return 0; | |
1488 | ||
1489 | /* Only allow to attach from LSM hooks, to avoid recursion */ | |
1490 | return prog->type != BPF_PROG_TYPE_LSM ? -EACCES : 0; | |
1491 | } | |
1492 | ||
1493 | static const struct btf_kfunc_id_set bpf_fs_kfunc_set = { | |
1494 | .owner = THIS_MODULE, | |
1495 | .set = &fs_kfunc_set_ids, | |
1496 | .filter = bpf_get_file_xattr_filter, | |
1497 | }; | |
1498 | ||
1499 | static int __init bpf_fs_kfuncs_init(void) | |
1500 | { | |
1501 | return register_btf_kfunc_id_set(BPF_PROG_TYPE_LSM, &bpf_fs_kfunc_set); | |
1502 | } | |
1503 | ||
1504 | late_initcall(bpf_fs_kfuncs_init); | |
1505 | ||
7adfc6c9 | 1506 | static const struct bpf_func_proto * |
fc611f47 | 1507 | bpf_tracing_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) |
2541517c AS |
1508 | { |
1509 | switch (func_id) { | |
1510 | case BPF_FUNC_map_lookup_elem: | |
1511 | return &bpf_map_lookup_elem_proto; | |
1512 | case BPF_FUNC_map_update_elem: | |
1513 | return &bpf_map_update_elem_proto; | |
1514 | case BPF_FUNC_map_delete_elem: | |
1515 | return &bpf_map_delete_elem_proto; | |
02a8c817 AC |
1516 | case BPF_FUNC_map_push_elem: |
1517 | return &bpf_map_push_elem_proto; | |
1518 | case BPF_FUNC_map_pop_elem: | |
1519 | return &bpf_map_pop_elem_proto; | |
1520 | case BPF_FUNC_map_peek_elem: | |
1521 | return &bpf_map_peek_elem_proto; | |
07343110 FZ |
1522 | case BPF_FUNC_map_lookup_percpu_elem: |
1523 | return &bpf_map_lookup_percpu_elem_proto; | |
d9847d31 AS |
1524 | case BPF_FUNC_ktime_get_ns: |
1525 | return &bpf_ktime_get_ns_proto; | |
71d19214 MÅ» |
1526 | case BPF_FUNC_ktime_get_boot_ns: |
1527 | return &bpf_ktime_get_boot_ns_proto; | |
04fd61ab AS |
1528 | case BPF_FUNC_tail_call: |
1529 | return &bpf_tail_call_proto; | |
606274c5 AS |
1530 | case BPF_FUNC_get_current_task: |
1531 | return &bpf_get_current_task_proto; | |
3ca1032a KS |
1532 | case BPF_FUNC_get_current_task_btf: |
1533 | return &bpf_get_current_task_btf_proto; | |
dd6e10fb DX |
1534 | case BPF_FUNC_task_pt_regs: |
1535 | return &bpf_task_pt_regs_proto; | |
ffeedafb AS |
1536 | case BPF_FUNC_get_current_uid_gid: |
1537 | return &bpf_get_current_uid_gid_proto; | |
1538 | case BPF_FUNC_get_current_comm: | |
1539 | return &bpf_get_current_comm_proto; | |
9c959c86 | 1540 | case BPF_FUNC_trace_printk: |
0756ea3e | 1541 | return bpf_get_trace_printk_proto(); |
ab1973d3 AS |
1542 | case BPF_FUNC_get_smp_processor_id: |
1543 | return &bpf_get_smp_processor_id_proto; | |
2d0e30c3 DB |
1544 | case BPF_FUNC_get_numa_node_id: |
1545 | return &bpf_get_numa_node_id_proto; | |
35578d79 KX |
1546 | case BPF_FUNC_perf_event_read: |
1547 | return &bpf_perf_event_read_proto; | |
60d20f91 SD |
1548 | case BPF_FUNC_current_task_under_cgroup: |
1549 | return &bpf_current_task_under_cgroup_proto; | |
8937bd80 AS |
1550 | case BPF_FUNC_get_prandom_u32: |
1551 | return &bpf_get_prandom_u32_proto; | |
51e1bb9e DB |
1552 | case BPF_FUNC_probe_write_user: |
1553 | return security_locked_down(LOCKDOWN_BPF_WRITE_USER) < 0 ? | |
1554 | NULL : bpf_get_probe_write_proto(); | |
6ae08ae3 DB |
1555 | case BPF_FUNC_probe_read_user: |
1556 | return &bpf_probe_read_user_proto; | |
1557 | case BPF_FUNC_probe_read_kernel: | |
71330842 | 1558 | return security_locked_down(LOCKDOWN_BPF_READ_KERNEL) < 0 ? |
ff40e510 | 1559 | NULL : &bpf_probe_read_kernel_proto; |
6ae08ae3 DB |
1560 | case BPF_FUNC_probe_read_user_str: |
1561 | return &bpf_probe_read_user_str_proto; | |
1562 | case BPF_FUNC_probe_read_kernel_str: | |
71330842 | 1563 | return security_locked_down(LOCKDOWN_BPF_READ_KERNEL) < 0 ? |
ff40e510 | 1564 | NULL : &bpf_probe_read_kernel_str_proto; |
0ebeea8c DB |
1565 | #ifdef CONFIG_ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE |
1566 | case BPF_FUNC_probe_read: | |
71330842 | 1567 | return security_locked_down(LOCKDOWN_BPF_READ_KERNEL) < 0 ? |
ff40e510 | 1568 | NULL : &bpf_probe_read_compat_proto; |
a5e8c070 | 1569 | case BPF_FUNC_probe_read_str: |
71330842 | 1570 | return security_locked_down(LOCKDOWN_BPF_READ_KERNEL) < 0 ? |
ff40e510 | 1571 | NULL : &bpf_probe_read_compat_str_proto; |
0ebeea8c | 1572 | #endif |
34ea38ca | 1573 | #ifdef CONFIG_CGROUPS |
c4bcfb38 YS |
1574 | case BPF_FUNC_cgrp_storage_get: |
1575 | return &bpf_cgrp_storage_get_proto; | |
1576 | case BPF_FUNC_cgrp_storage_delete: | |
1577 | return &bpf_cgrp_storage_delete_proto; | |
34ea38ca | 1578 | #endif |
8b401f9e YS |
1579 | case BPF_FUNC_send_signal: |
1580 | return &bpf_send_signal_proto; | |
8482941f YS |
1581 | case BPF_FUNC_send_signal_thread: |
1582 | return &bpf_send_signal_thread_proto; | |
b80b033b SL |
1583 | case BPF_FUNC_perf_event_read_value: |
1584 | return &bpf_perf_event_read_value_proto; | |
457f4436 AN |
1585 | case BPF_FUNC_ringbuf_output: |
1586 | return &bpf_ringbuf_output_proto; | |
1587 | case BPF_FUNC_ringbuf_reserve: | |
1588 | return &bpf_ringbuf_reserve_proto; | |
1589 | case BPF_FUNC_ringbuf_submit: | |
1590 | return &bpf_ringbuf_submit_proto; | |
1591 | case BPF_FUNC_ringbuf_discard: | |
1592 | return &bpf_ringbuf_discard_proto; | |
1593 | case BPF_FUNC_ringbuf_query: | |
1594 | return &bpf_ringbuf_query_proto; | |
72e2b2b6 YS |
1595 | case BPF_FUNC_jiffies64: |
1596 | return &bpf_jiffies64_proto; | |
fa28dcb8 SL |
1597 | case BPF_FUNC_get_task_stack: |
1598 | return &bpf_get_task_stack_proto; | |
07be4c4a | 1599 | case BPF_FUNC_copy_from_user: |
01685c5b | 1600 | return &bpf_copy_from_user_proto; |
376040e4 | 1601 | case BPF_FUNC_copy_from_user_task: |
01685c5b | 1602 | return &bpf_copy_from_user_task_proto; |
c4d0bfb4 AM |
1603 | case BPF_FUNC_snprintf_btf: |
1604 | return &bpf_snprintf_btf_proto; | |
b7906b70 | 1605 | case BPF_FUNC_per_cpu_ptr: |
eaa6bcb7 | 1606 | return &bpf_per_cpu_ptr_proto; |
b7906b70 | 1607 | case BPF_FUNC_this_cpu_ptr: |
63d9b80d | 1608 | return &bpf_this_cpu_ptr_proto; |
a10787e6 | 1609 | case BPF_FUNC_task_storage_get: |
4279adb0 MKL |
1610 | if (bpf_prog_check_recur(prog)) |
1611 | return &bpf_task_storage_get_recur_proto; | |
a10787e6 SL |
1612 | return &bpf_task_storage_get_proto; |
1613 | case BPF_FUNC_task_storage_delete: | |
8a7dac37 MKL |
1614 | if (bpf_prog_check_recur(prog)) |
1615 | return &bpf_task_storage_delete_recur_proto; | |
a10787e6 | 1616 | return &bpf_task_storage_delete_proto; |
69c087ba YS |
1617 | case BPF_FUNC_for_each_map_elem: |
1618 | return &bpf_for_each_map_elem_proto; | |
7b15523a FR |
1619 | case BPF_FUNC_snprintf: |
1620 | return &bpf_snprintf_proto; | |
9b99edca JO |
1621 | case BPF_FUNC_get_func_ip: |
1622 | return &bpf_get_func_ip_proto_tracing; | |
856c02db SL |
1623 | case BPF_FUNC_get_branch_snapshot: |
1624 | return &bpf_get_branch_snapshot_proto; | |
7c7e3d31 SL |
1625 | case BPF_FUNC_find_vma: |
1626 | return &bpf_find_vma_proto; | |
10aceb62 DM |
1627 | case BPF_FUNC_trace_vprintk: |
1628 | return bpf_get_trace_vprintk_proto(); | |
9fd82b61 | 1629 | default: |
bbc1d247 | 1630 | return bpf_base_func_proto(func_id, prog); |
9fd82b61 AS |
1631 | } |
1632 | } | |
1633 | ||
535a3692 JO |
1634 | static bool is_kprobe_multi(const struct bpf_prog *prog) |
1635 | { | |
1636 | return prog->expected_attach_type == BPF_TRACE_KPROBE_MULTI || | |
1637 | prog->expected_attach_type == BPF_TRACE_KPROBE_SESSION; | |
1638 | } | |
1639 | ||
1640 | static inline bool is_kprobe_session(const struct bpf_prog *prog) | |
1641 | { | |
1642 | return prog->expected_attach_type == BPF_TRACE_KPROBE_SESSION; | |
1643 | } | |
1644 | ||
5e43f899 AI |
1645 | static const struct bpf_func_proto * |
1646 | kprobe_prog_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) | |
9fd82b61 AS |
1647 | { |
1648 | switch (func_id) { | |
a43eec30 AS |
1649 | case BPF_FUNC_perf_event_output: |
1650 | return &bpf_perf_event_output_proto; | |
d5a3b1f6 AS |
1651 | case BPF_FUNC_get_stackid: |
1652 | return &bpf_get_stackid_proto; | |
c195651e YS |
1653 | case BPF_FUNC_get_stack: |
1654 | return &bpf_get_stack_proto; | |
9802d865 JB |
1655 | #ifdef CONFIG_BPF_KPROBE_OVERRIDE |
1656 | case BPF_FUNC_override_return: | |
1657 | return &bpf_override_return_proto; | |
1658 | #endif | |
9ffd9f3f | 1659 | case BPF_FUNC_get_func_ip: |
535a3692 | 1660 | if (is_kprobe_multi(prog)) |
686328d8 JO |
1661 | return &bpf_get_func_ip_proto_kprobe_multi; |
1662 | if (prog->expected_attach_type == BPF_TRACE_UPROBE_MULTI) | |
1663 | return &bpf_get_func_ip_proto_uprobe_multi; | |
1664 | return &bpf_get_func_ip_proto_kprobe; | |
7adfc6c9 | 1665 | case BPF_FUNC_get_attach_cookie: |
535a3692 | 1666 | if (is_kprobe_multi(prog)) |
0b779b61 JO |
1667 | return &bpf_get_attach_cookie_proto_kmulti; |
1668 | if (prog->expected_attach_type == BPF_TRACE_UPROBE_MULTI) | |
1669 | return &bpf_get_attach_cookie_proto_umulti; | |
1670 | return &bpf_get_attach_cookie_proto_trace; | |
2541517c | 1671 | default: |
fc611f47 | 1672 | return bpf_tracing_func_proto(func_id, prog); |
2541517c AS |
1673 | } |
1674 | } | |
1675 | ||
1676 | /* bpf+kprobe programs can access fields of 'struct pt_regs' */ | |
19de99f7 | 1677 | static bool kprobe_prog_is_valid_access(int off, int size, enum bpf_access_type type, |
5e43f899 | 1678 | const struct bpf_prog *prog, |
23994631 | 1679 | struct bpf_insn_access_aux *info) |
2541517c | 1680 | { |
2541517c AS |
1681 | if (off < 0 || off >= sizeof(struct pt_regs)) |
1682 | return false; | |
2541517c AS |
1683 | if (type != BPF_READ) |
1684 | return false; | |
2541517c AS |
1685 | if (off % size != 0) |
1686 | return false; | |
2d071c64 DB |
1687 | /* |
1688 | * Assertion for 32 bit to make sure last 8 byte access | |
1689 | * (BPF_DW) to the last 4 byte member is disallowed. | |
1690 | */ | |
1691 | if (off + size > sizeof(struct pt_regs)) | |
1692 | return false; | |
1693 | ||
2541517c AS |
1694 | return true; |
1695 | } | |
1696 | ||
7de16e3a | 1697 | const struct bpf_verifier_ops kprobe_verifier_ops = { |
2541517c AS |
1698 | .get_func_proto = kprobe_prog_func_proto, |
1699 | .is_valid_access = kprobe_prog_is_valid_access, | |
1700 | }; | |
1701 | ||
7de16e3a JK |
1702 | const struct bpf_prog_ops kprobe_prog_ops = { |
1703 | }; | |
1704 | ||
f3694e00 DB |
1705 | BPF_CALL_5(bpf_perf_event_output_tp, void *, tp_buff, struct bpf_map *, map, |
1706 | u64, flags, void *, data, u64, size) | |
9940d67c | 1707 | { |
f3694e00 DB |
1708 | struct pt_regs *regs = *(struct pt_regs **)tp_buff; |
1709 | ||
9940d67c AS |
1710 | /* |
1711 | * r1 points to perf tracepoint buffer where first 8 bytes are hidden | |
1712 | * from bpf program and contain a pointer to 'struct pt_regs'. Fetch it | |
f3694e00 | 1713 | * from there and call the same bpf_perf_event_output() helper inline. |
9940d67c | 1714 | */ |
f3694e00 | 1715 | return ____bpf_perf_event_output(regs, map, flags, data, size); |
9940d67c AS |
1716 | } |
1717 | ||
1718 | static const struct bpf_func_proto bpf_perf_event_output_proto_tp = { | |
1719 | .func = bpf_perf_event_output_tp, | |
1720 | .gpl_only = true, | |
1721 | .ret_type = RET_INTEGER, | |
1722 | .arg1_type = ARG_PTR_TO_CTX, | |
1723 | .arg2_type = ARG_CONST_MAP_PTR, | |
1724 | .arg3_type = ARG_ANYTHING, | |
216e3cd2 | 1725 | .arg4_type = ARG_PTR_TO_MEM | MEM_RDONLY, |
a60dd35d | 1726 | .arg5_type = ARG_CONST_SIZE_OR_ZERO, |
9940d67c AS |
1727 | }; |
1728 | ||
f3694e00 DB |
1729 | BPF_CALL_3(bpf_get_stackid_tp, void *, tp_buff, struct bpf_map *, map, |
1730 | u64, flags) | |
9940d67c | 1731 | { |
f3694e00 | 1732 | struct pt_regs *regs = *(struct pt_regs **)tp_buff; |
9940d67c | 1733 | |
f3694e00 DB |
1734 | /* |
1735 | * Same comment as in bpf_perf_event_output_tp(), only that this time | |
1736 | * the other helper's function body cannot be inlined due to being | |
1737 | * external, thus we need to call raw helper function. | |
1738 | */ | |
1739 | return bpf_get_stackid((unsigned long) regs, (unsigned long) map, | |
1740 | flags, 0, 0); | |
9940d67c AS |
1741 | } |
1742 | ||
1743 | static const struct bpf_func_proto bpf_get_stackid_proto_tp = { | |
1744 | .func = bpf_get_stackid_tp, | |
1745 | .gpl_only = true, | |
1746 | .ret_type = RET_INTEGER, | |
1747 | .arg1_type = ARG_PTR_TO_CTX, | |
1748 | .arg2_type = ARG_CONST_MAP_PTR, | |
1749 | .arg3_type = ARG_ANYTHING, | |
1750 | }; | |
1751 | ||
c195651e YS |
1752 | BPF_CALL_4(bpf_get_stack_tp, void *, tp_buff, void *, buf, u32, size, |
1753 | u64, flags) | |
1754 | { | |
1755 | struct pt_regs *regs = *(struct pt_regs **)tp_buff; | |
1756 | ||
1757 | return bpf_get_stack((unsigned long) regs, (unsigned long) buf, | |
1758 | (unsigned long) size, flags, 0); | |
1759 | } | |
1760 | ||
1761 | static const struct bpf_func_proto bpf_get_stack_proto_tp = { | |
1762 | .func = bpf_get_stack_tp, | |
1763 | .gpl_only = true, | |
1764 | .ret_type = RET_INTEGER, | |
1765 | .arg1_type = ARG_PTR_TO_CTX, | |
1766 | .arg2_type = ARG_PTR_TO_UNINIT_MEM, | |
1767 | .arg3_type = ARG_CONST_SIZE_OR_ZERO, | |
1768 | .arg4_type = ARG_ANYTHING, | |
1769 | }; | |
1770 | ||
5e43f899 AI |
1771 | static const struct bpf_func_proto * |
1772 | tp_prog_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) | |
f005afed YS |
1773 | { |
1774 | switch (func_id) { | |
1775 | case BPF_FUNC_perf_event_output: | |
1776 | return &bpf_perf_event_output_proto_tp; | |
1777 | case BPF_FUNC_get_stackid: | |
1778 | return &bpf_get_stackid_proto_tp; | |
c195651e YS |
1779 | case BPF_FUNC_get_stack: |
1780 | return &bpf_get_stack_proto_tp; | |
7adfc6c9 AN |
1781 | case BPF_FUNC_get_attach_cookie: |
1782 | return &bpf_get_attach_cookie_proto_trace; | |
f005afed | 1783 | default: |
fc611f47 | 1784 | return bpf_tracing_func_proto(func_id, prog); |
f005afed YS |
1785 | } |
1786 | } | |
1787 | ||
1788 | static bool tp_prog_is_valid_access(int off, int size, enum bpf_access_type type, | |
5e43f899 | 1789 | const struct bpf_prog *prog, |
f005afed YS |
1790 | struct bpf_insn_access_aux *info) |
1791 | { | |
1792 | if (off < sizeof(void *) || off >= PERF_MAX_TRACE_SIZE) | |
1793 | return false; | |
1794 | if (type != BPF_READ) | |
1795 | return false; | |
1796 | if (off % size != 0) | |
1797 | return false; | |
1798 | ||
1799 | BUILD_BUG_ON(PERF_MAX_TRACE_SIZE % sizeof(__u64)); | |
1800 | return true; | |
1801 | } | |
1802 | ||
1803 | const struct bpf_verifier_ops tracepoint_verifier_ops = { | |
1804 | .get_func_proto = tp_prog_func_proto, | |
1805 | .is_valid_access = tp_prog_is_valid_access, | |
1806 | }; | |
1807 | ||
1808 | const struct bpf_prog_ops tracepoint_prog_ops = { | |
1809 | }; | |
1810 | ||
1811 | BPF_CALL_3(bpf_perf_prog_read_value, struct bpf_perf_event_data_kern *, ctx, | |
4bebdc7a YS |
1812 | struct bpf_perf_event_value *, buf, u32, size) |
1813 | { | |
1814 | int err = -EINVAL; | |
1815 | ||
1816 | if (unlikely(size != sizeof(struct bpf_perf_event_value))) | |
1817 | goto clear; | |
1818 | err = perf_event_read_local(ctx->event, &buf->counter, &buf->enabled, | |
1819 | &buf->running); | |
1820 | if (unlikely(err)) | |
1821 | goto clear; | |
1822 | return 0; | |
1823 | clear: | |
1824 | memset(buf, 0, size); | |
1825 | return err; | |
1826 | } | |
1827 | ||
f005afed YS |
1828 | static const struct bpf_func_proto bpf_perf_prog_read_value_proto = { |
1829 | .func = bpf_perf_prog_read_value, | |
4bebdc7a YS |
1830 | .gpl_only = true, |
1831 | .ret_type = RET_INTEGER, | |
1832 | .arg1_type = ARG_PTR_TO_CTX, | |
1833 | .arg2_type = ARG_PTR_TO_UNINIT_MEM, | |
1834 | .arg3_type = ARG_CONST_SIZE, | |
1835 | }; | |
1836 | ||
fff7b643 DX |
1837 | BPF_CALL_4(bpf_read_branch_records, struct bpf_perf_event_data_kern *, ctx, |
1838 | void *, buf, u32, size, u64, flags) | |
1839 | { | |
fff7b643 DX |
1840 | static const u32 br_entry_size = sizeof(struct perf_branch_entry); |
1841 | struct perf_branch_stack *br_stack = ctx->data->br_stack; | |
1842 | u32 to_copy; | |
1843 | ||
1844 | if (unlikely(flags & ~BPF_F_GET_BRANCH_RECORDS_SIZE)) | |
1845 | return -EINVAL; | |
1846 | ||
cce6a2d7 JO |
1847 | if (unlikely(!(ctx->data->sample_flags & PERF_SAMPLE_BRANCH_STACK))) |
1848 | return -ENOENT; | |
1849 | ||
fff7b643 | 1850 | if (unlikely(!br_stack)) |
db52f572 | 1851 | return -ENOENT; |
fff7b643 DX |
1852 | |
1853 | if (flags & BPF_F_GET_BRANCH_RECORDS_SIZE) | |
1854 | return br_stack->nr * br_entry_size; | |
1855 | ||
1856 | if (!buf || (size % br_entry_size != 0)) | |
1857 | return -EINVAL; | |
1858 | ||
1859 | to_copy = min_t(u32, br_stack->nr * br_entry_size, size); | |
1860 | memcpy(buf, br_stack->entries, to_copy); | |
1861 | ||
1862 | return to_copy; | |
fff7b643 DX |
1863 | } |
1864 | ||
1865 | static const struct bpf_func_proto bpf_read_branch_records_proto = { | |
1866 | .func = bpf_read_branch_records, | |
1867 | .gpl_only = true, | |
1868 | .ret_type = RET_INTEGER, | |
1869 | .arg1_type = ARG_PTR_TO_CTX, | |
1870 | .arg2_type = ARG_PTR_TO_MEM_OR_NULL, | |
1871 | .arg3_type = ARG_CONST_SIZE_OR_ZERO, | |
1872 | .arg4_type = ARG_ANYTHING, | |
1873 | }; | |
1874 | ||
5e43f899 AI |
1875 | static const struct bpf_func_proto * |
1876 | pe_prog_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) | |
9fd82b61 AS |
1877 | { |
1878 | switch (func_id) { | |
1879 | case BPF_FUNC_perf_event_output: | |
9940d67c | 1880 | return &bpf_perf_event_output_proto_tp; |
9fd82b61 | 1881 | case BPF_FUNC_get_stackid: |
7b04d6d6 | 1882 | return &bpf_get_stackid_proto_pe; |
c195651e | 1883 | case BPF_FUNC_get_stack: |
7b04d6d6 | 1884 | return &bpf_get_stack_proto_pe; |
4bebdc7a | 1885 | case BPF_FUNC_perf_prog_read_value: |
f005afed | 1886 | return &bpf_perf_prog_read_value_proto; |
fff7b643 DX |
1887 | case BPF_FUNC_read_branch_records: |
1888 | return &bpf_read_branch_records_proto; | |
7adfc6c9 AN |
1889 | case BPF_FUNC_get_attach_cookie: |
1890 | return &bpf_get_attach_cookie_proto_pe; | |
9fd82b61 | 1891 | default: |
fc611f47 | 1892 | return bpf_tracing_func_proto(func_id, prog); |
9fd82b61 AS |
1893 | } |
1894 | } | |
1895 | ||
c4f6699d AS |
1896 | /* |
1897 | * bpf_raw_tp_regs are separate from bpf_pt_regs used from skb/xdp | |
1898 | * to avoid potential recursive reuse issue when/if tracepoints are added | |
9594dc3c MM |
1899 | * inside bpf_*_event_output, bpf_get_stackid and/or bpf_get_stack. |
1900 | * | |
1901 | * Since raw tracepoints run despite bpf_prog_active, support concurrent usage | |
1902 | * in normal, irq, and nmi context. | |
c4f6699d | 1903 | */ |
9594dc3c MM |
1904 | struct bpf_raw_tp_regs { |
1905 | struct pt_regs regs[3]; | |
1906 | }; | |
1907 | static DEFINE_PER_CPU(struct bpf_raw_tp_regs, bpf_raw_tp_regs); | |
1908 | static DEFINE_PER_CPU(int, bpf_raw_tp_nest_level); | |
1909 | static struct pt_regs *get_bpf_raw_tp_regs(void) | |
1910 | { | |
1911 | struct bpf_raw_tp_regs *tp_regs = this_cpu_ptr(&bpf_raw_tp_regs); | |
1912 | int nest_level = this_cpu_inc_return(bpf_raw_tp_nest_level); | |
1913 | ||
1914 | if (WARN_ON_ONCE(nest_level > ARRAY_SIZE(tp_regs->regs))) { | |
1915 | this_cpu_dec(bpf_raw_tp_nest_level); | |
1916 | return ERR_PTR(-EBUSY); | |
1917 | } | |
1918 | ||
1919 | return &tp_regs->regs[nest_level - 1]; | |
1920 | } | |
1921 | ||
1922 | static void put_bpf_raw_tp_regs(void) | |
1923 | { | |
1924 | this_cpu_dec(bpf_raw_tp_nest_level); | |
1925 | } | |
1926 | ||
c4f6699d AS |
1927 | BPF_CALL_5(bpf_perf_event_output_raw_tp, struct bpf_raw_tracepoint_args *, args, |
1928 | struct bpf_map *, map, u64, flags, void *, data, u64, size) | |
1929 | { | |
9594dc3c MM |
1930 | struct pt_regs *regs = get_bpf_raw_tp_regs(); |
1931 | int ret; | |
1932 | ||
1933 | if (IS_ERR(regs)) | |
1934 | return PTR_ERR(regs); | |
c4f6699d AS |
1935 | |
1936 | perf_fetch_caller_regs(regs); | |
9594dc3c MM |
1937 | ret = ____bpf_perf_event_output(regs, map, flags, data, size); |
1938 | ||
1939 | put_bpf_raw_tp_regs(); | |
1940 | return ret; | |
c4f6699d AS |
1941 | } |
1942 | ||
1943 | static const struct bpf_func_proto bpf_perf_event_output_proto_raw_tp = { | |
1944 | .func = bpf_perf_event_output_raw_tp, | |
1945 | .gpl_only = true, | |
1946 | .ret_type = RET_INTEGER, | |
1947 | .arg1_type = ARG_PTR_TO_CTX, | |
1948 | .arg2_type = ARG_CONST_MAP_PTR, | |
1949 | .arg3_type = ARG_ANYTHING, | |
216e3cd2 | 1950 | .arg4_type = ARG_PTR_TO_MEM | MEM_RDONLY, |
c4f6699d AS |
1951 | .arg5_type = ARG_CONST_SIZE_OR_ZERO, |
1952 | }; | |
1953 | ||
a7658e1a | 1954 | extern const struct bpf_func_proto bpf_skb_output_proto; |
d831ee84 | 1955 | extern const struct bpf_func_proto bpf_xdp_output_proto; |
d9917302 | 1956 | extern const struct bpf_func_proto bpf_xdp_get_buff_len_trace_proto; |
a7658e1a | 1957 | |
c4f6699d AS |
1958 | BPF_CALL_3(bpf_get_stackid_raw_tp, struct bpf_raw_tracepoint_args *, args, |
1959 | struct bpf_map *, map, u64, flags) | |
1960 | { | |
9594dc3c MM |
1961 | struct pt_regs *regs = get_bpf_raw_tp_regs(); |
1962 | int ret; | |
1963 | ||
1964 | if (IS_ERR(regs)) | |
1965 | return PTR_ERR(regs); | |
c4f6699d AS |
1966 | |
1967 | perf_fetch_caller_regs(regs); | |
1968 | /* similar to bpf_perf_event_output_tp, but pt_regs fetched differently */ | |
9594dc3c MM |
1969 | ret = bpf_get_stackid((unsigned long) regs, (unsigned long) map, |
1970 | flags, 0, 0); | |
1971 | put_bpf_raw_tp_regs(); | |
1972 | return ret; | |
c4f6699d AS |
1973 | } |
1974 | ||
1975 | static const struct bpf_func_proto bpf_get_stackid_proto_raw_tp = { | |
1976 | .func = bpf_get_stackid_raw_tp, | |
1977 | .gpl_only = true, | |
1978 | .ret_type = RET_INTEGER, | |
1979 | .arg1_type = ARG_PTR_TO_CTX, | |
1980 | .arg2_type = ARG_CONST_MAP_PTR, | |
1981 | .arg3_type = ARG_ANYTHING, | |
1982 | }; | |
1983 | ||
c195651e YS |
1984 | BPF_CALL_4(bpf_get_stack_raw_tp, struct bpf_raw_tracepoint_args *, args, |
1985 | void *, buf, u32, size, u64, flags) | |
1986 | { | |
9594dc3c MM |
1987 | struct pt_regs *regs = get_bpf_raw_tp_regs(); |
1988 | int ret; | |
1989 | ||
1990 | if (IS_ERR(regs)) | |
1991 | return PTR_ERR(regs); | |
c195651e YS |
1992 | |
1993 | perf_fetch_caller_regs(regs); | |
9594dc3c MM |
1994 | ret = bpf_get_stack((unsigned long) regs, (unsigned long) buf, |
1995 | (unsigned long) size, flags, 0); | |
1996 | put_bpf_raw_tp_regs(); | |
1997 | return ret; | |
c195651e YS |
1998 | } |
1999 | ||
2000 | static const struct bpf_func_proto bpf_get_stack_proto_raw_tp = { | |
2001 | .func = bpf_get_stack_raw_tp, | |
2002 | .gpl_only = true, | |
2003 | .ret_type = RET_INTEGER, | |
2004 | .arg1_type = ARG_PTR_TO_CTX, | |
216e3cd2 | 2005 | .arg2_type = ARG_PTR_TO_MEM | MEM_RDONLY, |
c195651e YS |
2006 | .arg3_type = ARG_CONST_SIZE_OR_ZERO, |
2007 | .arg4_type = ARG_ANYTHING, | |
2008 | }; | |
2009 | ||
5e43f899 AI |
2010 | static const struct bpf_func_proto * |
2011 | raw_tp_prog_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) | |
c4f6699d AS |
2012 | { |
2013 | switch (func_id) { | |
2014 | case BPF_FUNC_perf_event_output: | |
2015 | return &bpf_perf_event_output_proto_raw_tp; | |
2016 | case BPF_FUNC_get_stackid: | |
2017 | return &bpf_get_stackid_proto_raw_tp; | |
c195651e YS |
2018 | case BPF_FUNC_get_stack: |
2019 | return &bpf_get_stack_proto_raw_tp; | |
68ca5d4e AN |
2020 | case BPF_FUNC_get_attach_cookie: |
2021 | return &bpf_get_attach_cookie_proto_tracing; | |
c4f6699d | 2022 | default: |
fc611f47 | 2023 | return bpf_tracing_func_proto(func_id, prog); |
c4f6699d AS |
2024 | } |
2025 | } | |
2026 | ||
958a3f2d | 2027 | const struct bpf_func_proto * |
f1b9509c AS |
2028 | tracing_prog_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) |
2029 | { | |
3cee6fb8 MKL |
2030 | const struct bpf_func_proto *fn; |
2031 | ||
f1b9509c AS |
2032 | switch (func_id) { |
2033 | #ifdef CONFIG_NET | |
2034 | case BPF_FUNC_skb_output: | |
2035 | return &bpf_skb_output_proto; | |
d831ee84 EC |
2036 | case BPF_FUNC_xdp_output: |
2037 | return &bpf_xdp_output_proto; | |
af7ec138 YS |
2038 | case BPF_FUNC_skc_to_tcp6_sock: |
2039 | return &bpf_skc_to_tcp6_sock_proto; | |
478cfbdf YS |
2040 | case BPF_FUNC_skc_to_tcp_sock: |
2041 | return &bpf_skc_to_tcp_sock_proto; | |
2042 | case BPF_FUNC_skc_to_tcp_timewait_sock: | |
2043 | return &bpf_skc_to_tcp_timewait_sock_proto; | |
2044 | case BPF_FUNC_skc_to_tcp_request_sock: | |
2045 | return &bpf_skc_to_tcp_request_sock_proto; | |
0d4fad3e YS |
2046 | case BPF_FUNC_skc_to_udp6_sock: |
2047 | return &bpf_skc_to_udp6_sock_proto; | |
9eeb3aa3 HC |
2048 | case BPF_FUNC_skc_to_unix_sock: |
2049 | return &bpf_skc_to_unix_sock_proto; | |
3bc253c2 GT |
2050 | case BPF_FUNC_skc_to_mptcp_sock: |
2051 | return &bpf_skc_to_mptcp_sock_proto; | |
8e4597c6 MKL |
2052 | case BPF_FUNC_sk_storage_get: |
2053 | return &bpf_sk_storage_get_tracing_proto; | |
2054 | case BPF_FUNC_sk_storage_delete: | |
2055 | return &bpf_sk_storage_delete_tracing_proto; | |
b60da495 FR |
2056 | case BPF_FUNC_sock_from_file: |
2057 | return &bpf_sock_from_file_proto; | |
c5dbb89f FR |
2058 | case BPF_FUNC_get_socket_cookie: |
2059 | return &bpf_get_socket_ptr_cookie_proto; | |
d9917302 EC |
2060 | case BPF_FUNC_xdp_get_buff_len: |
2061 | return &bpf_xdp_get_buff_len_trace_proto; | |
f1b9509c | 2062 | #endif |
492e639f YS |
2063 | case BPF_FUNC_seq_printf: |
2064 | return prog->expected_attach_type == BPF_TRACE_ITER ? | |
2065 | &bpf_seq_printf_proto : | |
2066 | NULL; | |
2067 | case BPF_FUNC_seq_write: | |
2068 | return prog->expected_attach_type == BPF_TRACE_ITER ? | |
2069 | &bpf_seq_write_proto : | |
2070 | NULL; | |
eb411377 AM |
2071 | case BPF_FUNC_seq_printf_btf: |
2072 | return prog->expected_attach_type == BPF_TRACE_ITER ? | |
2073 | &bpf_seq_printf_btf_proto : | |
2074 | NULL; | |
6e22ab9d JO |
2075 | case BPF_FUNC_d_path: |
2076 | return &bpf_d_path_proto; | |
f92c1e18 JO |
2077 | case BPF_FUNC_get_func_arg: |
2078 | return bpf_prog_has_trampoline(prog) ? &bpf_get_func_arg_proto : NULL; | |
2079 | case BPF_FUNC_get_func_ret: | |
2080 | return bpf_prog_has_trampoline(prog) ? &bpf_get_func_ret_proto : NULL; | |
2081 | case BPF_FUNC_get_func_arg_cnt: | |
2082 | return bpf_prog_has_trampoline(prog) ? &bpf_get_func_arg_cnt_proto : NULL; | |
2fcc8241 | 2083 | case BPF_FUNC_get_attach_cookie: |
68ca5d4e AN |
2084 | if (prog->type == BPF_PROG_TYPE_TRACING && |
2085 | prog->expected_attach_type == BPF_TRACE_RAW_TP) | |
2086 | return &bpf_get_attach_cookie_proto_tracing; | |
2fcc8241 | 2087 | return bpf_prog_has_trampoline(prog) ? &bpf_get_attach_cookie_proto_tracing : NULL; |
f1b9509c | 2088 | default: |
3cee6fb8 MKL |
2089 | fn = raw_tp_prog_func_proto(func_id, prog); |
2090 | if (!fn && prog->expected_attach_type == BPF_TRACE_ITER) | |
2091 | fn = bpf_iter_get_func_proto(func_id, prog); | |
2092 | return fn; | |
f1b9509c AS |
2093 | } |
2094 | } | |
2095 | ||
c4f6699d AS |
2096 | static bool raw_tp_prog_is_valid_access(int off, int size, |
2097 | enum bpf_access_type type, | |
5e43f899 | 2098 | const struct bpf_prog *prog, |
c4f6699d AS |
2099 | struct bpf_insn_access_aux *info) |
2100 | { | |
35346ab6 | 2101 | return bpf_tracing_ctx_access(off, size, type); |
f1b9509c AS |
2102 | } |
2103 | ||
2104 | static bool tracing_prog_is_valid_access(int off, int size, | |
2105 | enum bpf_access_type type, | |
2106 | const struct bpf_prog *prog, | |
2107 | struct bpf_insn_access_aux *info) | |
2108 | { | |
35346ab6 | 2109 | return bpf_tracing_btf_ctx_access(off, size, type, prog, info); |
c4f6699d AS |
2110 | } |
2111 | ||
3e7c67d9 KS |
2112 | int __weak bpf_prog_test_run_tracing(struct bpf_prog *prog, |
2113 | const union bpf_attr *kattr, | |
2114 | union bpf_attr __user *uattr) | |
2115 | { | |
2116 | return -ENOTSUPP; | |
2117 | } | |
2118 | ||
c4f6699d AS |
2119 | const struct bpf_verifier_ops raw_tracepoint_verifier_ops = { |
2120 | .get_func_proto = raw_tp_prog_func_proto, | |
2121 | .is_valid_access = raw_tp_prog_is_valid_access, | |
2122 | }; | |
2123 | ||
2124 | const struct bpf_prog_ops raw_tracepoint_prog_ops = { | |
ebfb4d40 | 2125 | #ifdef CONFIG_NET |
1b4d60ec | 2126 | .test_run = bpf_prog_test_run_raw_tp, |
ebfb4d40 | 2127 | #endif |
c4f6699d AS |
2128 | }; |
2129 | ||
f1b9509c AS |
2130 | const struct bpf_verifier_ops tracing_verifier_ops = { |
2131 | .get_func_proto = tracing_prog_func_proto, | |
2132 | .is_valid_access = tracing_prog_is_valid_access, | |
2133 | }; | |
2134 | ||
2135 | const struct bpf_prog_ops tracing_prog_ops = { | |
da00d2f1 | 2136 | .test_run = bpf_prog_test_run_tracing, |
f1b9509c AS |
2137 | }; |
2138 | ||
9df1c28b MM |
2139 | static bool raw_tp_writable_prog_is_valid_access(int off, int size, |
2140 | enum bpf_access_type type, | |
2141 | const struct bpf_prog *prog, | |
2142 | struct bpf_insn_access_aux *info) | |
2143 | { | |
2144 | if (off == 0) { | |
2145 | if (size != sizeof(u64) || type != BPF_READ) | |
2146 | return false; | |
2147 | info->reg_type = PTR_TO_TP_BUFFER; | |
2148 | } | |
2149 | return raw_tp_prog_is_valid_access(off, size, type, prog, info); | |
2150 | } | |
2151 | ||
2152 | const struct bpf_verifier_ops raw_tracepoint_writable_verifier_ops = { | |
2153 | .get_func_proto = raw_tp_prog_func_proto, | |
2154 | .is_valid_access = raw_tp_writable_prog_is_valid_access, | |
2155 | }; | |
2156 | ||
2157 | const struct bpf_prog_ops raw_tracepoint_writable_prog_ops = { | |
2158 | }; | |
2159 | ||
0515e599 | 2160 | static bool pe_prog_is_valid_access(int off, int size, enum bpf_access_type type, |
5e43f899 | 2161 | const struct bpf_prog *prog, |
23994631 | 2162 | struct bpf_insn_access_aux *info) |
0515e599 | 2163 | { |
95da0cdb | 2164 | const int size_u64 = sizeof(u64); |
31fd8581 | 2165 | |
0515e599 AS |
2166 | if (off < 0 || off >= sizeof(struct bpf_perf_event_data)) |
2167 | return false; | |
2168 | if (type != BPF_READ) | |
2169 | return false; | |
bc23105c DB |
2170 | if (off % size != 0) { |
2171 | if (sizeof(unsigned long) != 4) | |
2172 | return false; | |
2173 | if (size != 8) | |
2174 | return false; | |
2175 | if (off % size != 4) | |
2176 | return false; | |
2177 | } | |
31fd8581 | 2178 | |
f96da094 DB |
2179 | switch (off) { |
2180 | case bpf_ctx_range(struct bpf_perf_event_data, sample_period): | |
95da0cdb TQ |
2181 | bpf_ctx_record_field_size(info, size_u64); |
2182 | if (!bpf_ctx_narrow_access_ok(off, size, size_u64)) | |
2183 | return false; | |
2184 | break; | |
2185 | case bpf_ctx_range(struct bpf_perf_event_data, addr): | |
2186 | bpf_ctx_record_field_size(info, size_u64); | |
2187 | if (!bpf_ctx_narrow_access_ok(off, size, size_u64)) | |
23994631 | 2188 | return false; |
f96da094 DB |
2189 | break; |
2190 | default: | |
0515e599 AS |
2191 | if (size != sizeof(long)) |
2192 | return false; | |
2193 | } | |
f96da094 | 2194 | |
0515e599 AS |
2195 | return true; |
2196 | } | |
2197 | ||
6b8cc1d1 DB |
2198 | static u32 pe_prog_convert_ctx_access(enum bpf_access_type type, |
2199 | const struct bpf_insn *si, | |
0515e599 | 2200 | struct bpf_insn *insn_buf, |
f96da094 | 2201 | struct bpf_prog *prog, u32 *target_size) |
0515e599 AS |
2202 | { |
2203 | struct bpf_insn *insn = insn_buf; | |
2204 | ||
6b8cc1d1 | 2205 | switch (si->off) { |
0515e599 | 2206 | case offsetof(struct bpf_perf_event_data, sample_period): |
f035a515 | 2207 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct bpf_perf_event_data_kern, |
6b8cc1d1 | 2208 | data), si->dst_reg, si->src_reg, |
0515e599 | 2209 | offsetof(struct bpf_perf_event_data_kern, data)); |
6b8cc1d1 | 2210 | *insn++ = BPF_LDX_MEM(BPF_DW, si->dst_reg, si->dst_reg, |
f96da094 DB |
2211 | bpf_target_off(struct perf_sample_data, period, 8, |
2212 | target_size)); | |
0515e599 | 2213 | break; |
95da0cdb TQ |
2214 | case offsetof(struct bpf_perf_event_data, addr): |
2215 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct bpf_perf_event_data_kern, | |
2216 | data), si->dst_reg, si->src_reg, | |
2217 | offsetof(struct bpf_perf_event_data_kern, data)); | |
2218 | *insn++ = BPF_LDX_MEM(BPF_DW, si->dst_reg, si->dst_reg, | |
2219 | bpf_target_off(struct perf_sample_data, addr, 8, | |
2220 | target_size)); | |
2221 | break; | |
0515e599 | 2222 | default: |
f035a515 | 2223 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct bpf_perf_event_data_kern, |
6b8cc1d1 | 2224 | regs), si->dst_reg, si->src_reg, |
0515e599 | 2225 | offsetof(struct bpf_perf_event_data_kern, regs)); |
6b8cc1d1 DB |
2226 | *insn++ = BPF_LDX_MEM(BPF_SIZEOF(long), si->dst_reg, si->dst_reg, |
2227 | si->off); | |
0515e599 AS |
2228 | break; |
2229 | } | |
2230 | ||
2231 | return insn - insn_buf; | |
2232 | } | |
2233 | ||
7de16e3a | 2234 | const struct bpf_verifier_ops perf_event_verifier_ops = { |
f005afed | 2235 | .get_func_proto = pe_prog_func_proto, |
0515e599 AS |
2236 | .is_valid_access = pe_prog_is_valid_access, |
2237 | .convert_ctx_access = pe_prog_convert_ctx_access, | |
2238 | }; | |
7de16e3a JK |
2239 | |
2240 | const struct bpf_prog_ops perf_event_prog_ops = { | |
2241 | }; | |
e87c6bc3 YS |
2242 | |
2243 | static DEFINE_MUTEX(bpf_event_mutex); | |
2244 | ||
c8c088ba YS |
2245 | #define BPF_TRACE_MAX_PROGS 64 |
2246 | ||
e87c6bc3 | 2247 | int perf_event_attach_bpf_prog(struct perf_event *event, |
82e6b1ee AN |
2248 | struct bpf_prog *prog, |
2249 | u64 bpf_cookie) | |
e87c6bc3 | 2250 | { |
e672db03 | 2251 | struct bpf_prog_array *old_array; |
e87c6bc3 YS |
2252 | struct bpf_prog_array *new_array; |
2253 | int ret = -EEXIST; | |
2254 | ||
9802d865 | 2255 | /* |
b4da3340 MH |
2256 | * Kprobe override only works if they are on the function entry, |
2257 | * and only if they are on the opt-in list. | |
9802d865 JB |
2258 | */ |
2259 | if (prog->kprobe_override && | |
b4da3340 | 2260 | (!trace_kprobe_on_func_entry(event->tp_event) || |
9802d865 JB |
2261 | !trace_kprobe_error_injectable(event->tp_event))) |
2262 | return -EINVAL; | |
2263 | ||
e87c6bc3 YS |
2264 | mutex_lock(&bpf_event_mutex); |
2265 | ||
2266 | if (event->prog) | |
07c41a29 | 2267 | goto unlock; |
e87c6bc3 | 2268 | |
e672db03 | 2269 | old_array = bpf_event_rcu_dereference(event->tp_event->prog_array); |
c8c088ba YS |
2270 | if (old_array && |
2271 | bpf_prog_array_length(old_array) >= BPF_TRACE_MAX_PROGS) { | |
2272 | ret = -E2BIG; | |
2273 | goto unlock; | |
2274 | } | |
2275 | ||
82e6b1ee | 2276 | ret = bpf_prog_array_copy(old_array, NULL, prog, bpf_cookie, &new_array); |
e87c6bc3 | 2277 | if (ret < 0) |
07c41a29 | 2278 | goto unlock; |
e87c6bc3 YS |
2279 | |
2280 | /* set the new array to event->tp_event and set event->prog */ | |
2281 | event->prog = prog; | |
82e6b1ee | 2282 | event->bpf_cookie = bpf_cookie; |
e87c6bc3 | 2283 | rcu_assign_pointer(event->tp_event->prog_array, new_array); |
8c7dcb84 | 2284 | bpf_prog_array_free_sleepable(old_array); |
e87c6bc3 | 2285 | |
07c41a29 | 2286 | unlock: |
e87c6bc3 YS |
2287 | mutex_unlock(&bpf_event_mutex); |
2288 | return ret; | |
2289 | } | |
2290 | ||
2291 | void perf_event_detach_bpf_prog(struct perf_event *event) | |
2292 | { | |
e672db03 | 2293 | struct bpf_prog_array *old_array; |
e87c6bc3 YS |
2294 | struct bpf_prog_array *new_array; |
2295 | int ret; | |
2296 | ||
2297 | mutex_lock(&bpf_event_mutex); | |
2298 | ||
2299 | if (!event->prog) | |
07c41a29 | 2300 | goto unlock; |
e87c6bc3 | 2301 | |
e672db03 | 2302 | old_array = bpf_event_rcu_dereference(event->tp_event->prog_array); |
82e6b1ee | 2303 | ret = bpf_prog_array_copy(old_array, event->prog, NULL, 0, &new_array); |
170a7e3e SY |
2304 | if (ret == -ENOENT) |
2305 | goto unlock; | |
e87c6bc3 YS |
2306 | if (ret < 0) { |
2307 | bpf_prog_array_delete_safe(old_array, event->prog); | |
2308 | } else { | |
2309 | rcu_assign_pointer(event->tp_event->prog_array, new_array); | |
8c7dcb84 | 2310 | bpf_prog_array_free_sleepable(old_array); |
e87c6bc3 YS |
2311 | } |
2312 | ||
2313 | bpf_prog_put(event->prog); | |
2314 | event->prog = NULL; | |
2315 | ||
07c41a29 | 2316 | unlock: |
e87c6bc3 YS |
2317 | mutex_unlock(&bpf_event_mutex); |
2318 | } | |
f371b304 | 2319 | |
f4e2298e | 2320 | int perf_event_query_prog_array(struct perf_event *event, void __user *info) |
f371b304 YS |
2321 | { |
2322 | struct perf_event_query_bpf __user *uquery = info; | |
2323 | struct perf_event_query_bpf query = {}; | |
e672db03 | 2324 | struct bpf_prog_array *progs; |
3a38bb98 | 2325 | u32 *ids, prog_cnt, ids_len; |
f371b304 YS |
2326 | int ret; |
2327 | ||
031258da | 2328 | if (!perfmon_capable()) |
f371b304 YS |
2329 | return -EPERM; |
2330 | if (event->attr.type != PERF_TYPE_TRACEPOINT) | |
2331 | return -EINVAL; | |
2332 | if (copy_from_user(&query, uquery, sizeof(query))) | |
2333 | return -EFAULT; | |
3a38bb98 YS |
2334 | |
2335 | ids_len = query.ids_len; | |
2336 | if (ids_len > BPF_TRACE_MAX_PROGS) | |
9c481b90 | 2337 | return -E2BIG; |
3a38bb98 YS |
2338 | ids = kcalloc(ids_len, sizeof(u32), GFP_USER | __GFP_NOWARN); |
2339 | if (!ids) | |
2340 | return -ENOMEM; | |
2341 | /* | |
2342 | * The above kcalloc returns ZERO_SIZE_PTR when ids_len = 0, which | |
2343 | * is required when user only wants to check for uquery->prog_cnt. | |
2344 | * There is no need to check for it since the case is handled | |
2345 | * gracefully in bpf_prog_array_copy_info. | |
2346 | */ | |
f371b304 YS |
2347 | |
2348 | mutex_lock(&bpf_event_mutex); | |
e672db03 SF |
2349 | progs = bpf_event_rcu_dereference(event->tp_event->prog_array); |
2350 | ret = bpf_prog_array_copy_info(progs, ids, ids_len, &prog_cnt); | |
f371b304 YS |
2351 | mutex_unlock(&bpf_event_mutex); |
2352 | ||
3a38bb98 YS |
2353 | if (copy_to_user(&uquery->prog_cnt, &prog_cnt, sizeof(prog_cnt)) || |
2354 | copy_to_user(uquery->ids, ids, ids_len * sizeof(u32))) | |
2355 | ret = -EFAULT; | |
2356 | ||
2357 | kfree(ids); | |
f371b304 YS |
2358 | return ret; |
2359 | } | |
c4f6699d AS |
2360 | |
2361 | extern struct bpf_raw_event_map __start__bpf_raw_tp[]; | |
2362 | extern struct bpf_raw_event_map __stop__bpf_raw_tp[]; | |
2363 | ||
a38d1107 | 2364 | struct bpf_raw_event_map *bpf_get_raw_tracepoint(const char *name) |
c4f6699d AS |
2365 | { |
2366 | struct bpf_raw_event_map *btp = __start__bpf_raw_tp; | |
2367 | ||
2368 | for (; btp < __stop__bpf_raw_tp; btp++) { | |
2369 | if (!strcmp(btp->tp->name, name)) | |
2370 | return btp; | |
2371 | } | |
a38d1107 MM |
2372 | |
2373 | return bpf_get_raw_tracepoint_module(name); | |
2374 | } | |
2375 | ||
2376 | void bpf_put_raw_tracepoint(struct bpf_raw_event_map *btp) | |
2377 | { | |
12cc126d | 2378 | struct module *mod; |
a38d1107 | 2379 | |
12cc126d AN |
2380 | preempt_disable(); |
2381 | mod = __module_address((unsigned long)btp); | |
2382 | module_put(mod); | |
2383 | preempt_enable(); | |
c4f6699d AS |
2384 | } |
2385 | ||
2386 | static __always_inline | |
d4dfc570 | 2387 | void __bpf_trace_run(struct bpf_raw_tp_link *link, u64 *args) |
c4f6699d | 2388 | { |
d4dfc570 | 2389 | struct bpf_prog *prog = link->link.prog; |
68ca5d4e AN |
2390 | struct bpf_run_ctx *old_run_ctx; |
2391 | struct bpf_trace_run_ctx run_ctx; | |
d4dfc570 | 2392 | |
f03efe49 | 2393 | cant_sleep(); |
05b24ff9 JO |
2394 | if (unlikely(this_cpu_inc_return(*(prog->active)) != 1)) { |
2395 | bpf_prog_inc_misses_counter(prog); | |
2396 | goto out; | |
2397 | } | |
68ca5d4e AN |
2398 | |
2399 | run_ctx.bpf_cookie = link->cookie; | |
2400 | old_run_ctx = bpf_set_run_ctx(&run_ctx.run_ctx); | |
2401 | ||
c4f6699d | 2402 | rcu_read_lock(); |
fb7dd8bc | 2403 | (void) bpf_prog_run(prog, args); |
c4f6699d | 2404 | rcu_read_unlock(); |
68ca5d4e AN |
2405 | |
2406 | bpf_reset_run_ctx(old_run_ctx); | |
05b24ff9 JO |
2407 | out: |
2408 | this_cpu_dec(*(prog->active)); | |
c4f6699d AS |
2409 | } |
2410 | ||
2411 | #define UNPACK(...) __VA_ARGS__ | |
2412 | #define REPEAT_1(FN, DL, X, ...) FN(X) | |
2413 | #define REPEAT_2(FN, DL, X, ...) FN(X) UNPACK DL REPEAT_1(FN, DL, __VA_ARGS__) | |
2414 | #define REPEAT_3(FN, DL, X, ...) FN(X) UNPACK DL REPEAT_2(FN, DL, __VA_ARGS__) | |
2415 | #define REPEAT_4(FN, DL, X, ...) FN(X) UNPACK DL REPEAT_3(FN, DL, __VA_ARGS__) | |
2416 | #define REPEAT_5(FN, DL, X, ...) FN(X) UNPACK DL REPEAT_4(FN, DL, __VA_ARGS__) | |
2417 | #define REPEAT_6(FN, DL, X, ...) FN(X) UNPACK DL REPEAT_5(FN, DL, __VA_ARGS__) | |
2418 | #define REPEAT_7(FN, DL, X, ...) FN(X) UNPACK DL REPEAT_6(FN, DL, __VA_ARGS__) | |
2419 | #define REPEAT_8(FN, DL, X, ...) FN(X) UNPACK DL REPEAT_7(FN, DL, __VA_ARGS__) | |
2420 | #define REPEAT_9(FN, DL, X, ...) FN(X) UNPACK DL REPEAT_8(FN, DL, __VA_ARGS__) | |
2421 | #define REPEAT_10(FN, DL, X, ...) FN(X) UNPACK DL REPEAT_9(FN, DL, __VA_ARGS__) | |
2422 | #define REPEAT_11(FN, DL, X, ...) FN(X) UNPACK DL REPEAT_10(FN, DL, __VA_ARGS__) | |
2423 | #define REPEAT_12(FN, DL, X, ...) FN(X) UNPACK DL REPEAT_11(FN, DL, __VA_ARGS__) | |
2424 | #define REPEAT(X, FN, DL, ...) REPEAT_##X(FN, DL, __VA_ARGS__) | |
2425 | ||
2426 | #define SARG(X) u64 arg##X | |
2427 | #define COPY(X) args[X] = arg##X | |
2428 | ||
2429 | #define __DL_COM (,) | |
2430 | #define __DL_SEM (;) | |
2431 | ||
2432 | #define __SEQ_0_11 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 | |
2433 | ||
2434 | #define BPF_TRACE_DEFN_x(x) \ | |
d4dfc570 | 2435 | void bpf_trace_run##x(struct bpf_raw_tp_link *link, \ |
c4f6699d AS |
2436 | REPEAT(x, SARG, __DL_COM, __SEQ_0_11)) \ |
2437 | { \ | |
2438 | u64 args[x]; \ | |
2439 | REPEAT(x, COPY, __DL_SEM, __SEQ_0_11); \ | |
d4dfc570 | 2440 | __bpf_trace_run(link, args); \ |
c4f6699d AS |
2441 | } \ |
2442 | EXPORT_SYMBOL_GPL(bpf_trace_run##x) | |
2443 | BPF_TRACE_DEFN_x(1); | |
2444 | BPF_TRACE_DEFN_x(2); | |
2445 | BPF_TRACE_DEFN_x(3); | |
2446 | BPF_TRACE_DEFN_x(4); | |
2447 | BPF_TRACE_DEFN_x(5); | |
2448 | BPF_TRACE_DEFN_x(6); | |
2449 | BPF_TRACE_DEFN_x(7); | |
2450 | BPF_TRACE_DEFN_x(8); | |
2451 | BPF_TRACE_DEFN_x(9); | |
2452 | BPF_TRACE_DEFN_x(10); | |
2453 | BPF_TRACE_DEFN_x(11); | |
2454 | BPF_TRACE_DEFN_x(12); | |
2455 | ||
d4dfc570 | 2456 | int bpf_probe_register(struct bpf_raw_event_map *btp, struct bpf_raw_tp_link *link) |
c4f6699d AS |
2457 | { |
2458 | struct tracepoint *tp = btp->tp; | |
d4dfc570 | 2459 | struct bpf_prog *prog = link->link.prog; |
c4f6699d AS |
2460 | |
2461 | /* | |
2462 | * check that program doesn't access arguments beyond what's | |
2463 | * available in this tracepoint | |
2464 | */ | |
2465 | if (prog->aux->max_ctx_offset > btp->num_args * sizeof(u64)) | |
2466 | return -EINVAL; | |
2467 | ||
9df1c28b MM |
2468 | if (prog->aux->max_tp_access > btp->writable_size) |
2469 | return -EINVAL; | |
2470 | ||
d4dfc570 | 2471 | return tracepoint_probe_register_may_exist(tp, (void *)btp->bpf_func, link); |
c4f6699d AS |
2472 | } |
2473 | ||
d4dfc570 | 2474 | int bpf_probe_unregister(struct bpf_raw_event_map *btp, struct bpf_raw_tp_link *link) |
c4f6699d | 2475 | { |
d4dfc570 | 2476 | return tracepoint_probe_unregister(btp->tp, (void *)btp->bpf_func, link); |
c4f6699d | 2477 | } |
41bdc4b4 YS |
2478 | |
2479 | int bpf_get_perf_event_info(const struct perf_event *event, u32 *prog_id, | |
2480 | u32 *fd_type, const char **buf, | |
3acf8ace JO |
2481 | u64 *probe_offset, u64 *probe_addr, |
2482 | unsigned long *missed) | |
41bdc4b4 YS |
2483 | { |
2484 | bool is_tracepoint, is_syscall_tp; | |
2485 | struct bpf_prog *prog; | |
2486 | int flags, err = 0; | |
2487 | ||
2488 | prog = event->prog; | |
2489 | if (!prog) | |
2490 | return -ENOENT; | |
2491 | ||
2492 | /* not supporting BPF_PROG_TYPE_PERF_EVENT yet */ | |
2493 | if (prog->type == BPF_PROG_TYPE_PERF_EVENT) | |
2494 | return -EOPNOTSUPP; | |
2495 | ||
2496 | *prog_id = prog->aux->id; | |
2497 | flags = event->tp_event->flags; | |
2498 | is_tracepoint = flags & TRACE_EVENT_FL_TRACEPOINT; | |
2499 | is_syscall_tp = is_syscall_trace_event(event->tp_event); | |
2500 | ||
2501 | if (is_tracepoint || is_syscall_tp) { | |
2502 | *buf = is_tracepoint ? event->tp_event->tp->name | |
2503 | : event->tp_event->name; | |
1b715e1b YS |
2504 | /* We allow NULL pointer for tracepoint */ |
2505 | if (fd_type) | |
2506 | *fd_type = BPF_FD_TYPE_TRACEPOINT; | |
2507 | if (probe_offset) | |
2508 | *probe_offset = 0x0; | |
2509 | if (probe_addr) | |
2510 | *probe_addr = 0x0; | |
41bdc4b4 YS |
2511 | } else { |
2512 | /* kprobe/uprobe */ | |
2513 | err = -EOPNOTSUPP; | |
2514 | #ifdef CONFIG_KPROBE_EVENTS | |
2515 | if (flags & TRACE_EVENT_FL_KPROBE) | |
2516 | err = bpf_get_kprobe_info(event, fd_type, buf, | |
3acf8ace | 2517 | probe_offset, probe_addr, missed, |
41bdc4b4 YS |
2518 | event->attr.type == PERF_TYPE_TRACEPOINT); |
2519 | #endif | |
2520 | #ifdef CONFIG_UPROBE_EVENTS | |
2521 | if (flags & TRACE_EVENT_FL_UPROBE) | |
2522 | err = bpf_get_uprobe_info(event, fd_type, buf, | |
5125e757 | 2523 | probe_offset, probe_addr, |
41bdc4b4 YS |
2524 | event->attr.type == PERF_TYPE_TRACEPOINT); |
2525 | #endif | |
2526 | } | |
2527 | ||
2528 | return err; | |
2529 | } | |
a38d1107 | 2530 | |
9db1ff0a YS |
2531 | static int __init send_signal_irq_work_init(void) |
2532 | { | |
2533 | int cpu; | |
2534 | struct send_signal_irq_work *work; | |
2535 | ||
2536 | for_each_possible_cpu(cpu) { | |
2537 | work = per_cpu_ptr(&send_signal_work, cpu); | |
2538 | init_irq_work(&work->irq_work, do_bpf_send_signal); | |
2539 | } | |
2540 | return 0; | |
2541 | } | |
2542 | ||
2543 | subsys_initcall(send_signal_irq_work_init); | |
2544 | ||
a38d1107 | 2545 | #ifdef CONFIG_MODULES |
390e99cf SF |
2546 | static int bpf_event_notify(struct notifier_block *nb, unsigned long op, |
2547 | void *module) | |
a38d1107 MM |
2548 | { |
2549 | struct bpf_trace_module *btm, *tmp; | |
2550 | struct module *mod = module; | |
0340a6b7 | 2551 | int ret = 0; |
a38d1107 MM |
2552 | |
2553 | if (mod->num_bpf_raw_events == 0 || | |
2554 | (op != MODULE_STATE_COMING && op != MODULE_STATE_GOING)) | |
0340a6b7 | 2555 | goto out; |
a38d1107 MM |
2556 | |
2557 | mutex_lock(&bpf_module_mutex); | |
2558 | ||
2559 | switch (op) { | |
2560 | case MODULE_STATE_COMING: | |
2561 | btm = kzalloc(sizeof(*btm), GFP_KERNEL); | |
2562 | if (btm) { | |
2563 | btm->module = module; | |
2564 | list_add(&btm->list, &bpf_trace_modules); | |
0340a6b7 PZ |
2565 | } else { |
2566 | ret = -ENOMEM; | |
a38d1107 MM |
2567 | } |
2568 | break; | |
2569 | case MODULE_STATE_GOING: | |
2570 | list_for_each_entry_safe(btm, tmp, &bpf_trace_modules, list) { | |
2571 | if (btm->module == module) { | |
2572 | list_del(&btm->list); | |
2573 | kfree(btm); | |
2574 | break; | |
2575 | } | |
2576 | } | |
2577 | break; | |
2578 | } | |
2579 | ||
2580 | mutex_unlock(&bpf_module_mutex); | |
2581 | ||
0340a6b7 PZ |
2582 | out: |
2583 | return notifier_from_errno(ret); | |
a38d1107 MM |
2584 | } |
2585 | ||
2586 | static struct notifier_block bpf_module_nb = { | |
2587 | .notifier_call = bpf_event_notify, | |
2588 | }; | |
2589 | ||
390e99cf | 2590 | static int __init bpf_event_init(void) |
a38d1107 MM |
2591 | { |
2592 | register_module_notifier(&bpf_module_nb); | |
2593 | return 0; | |
2594 | } | |
2595 | ||
2596 | fs_initcall(bpf_event_init); | |
2597 | #endif /* CONFIG_MODULES */ | |
0dcac272 | 2598 | |
adf46d88 JO |
2599 | struct bpf_session_run_ctx { |
2600 | struct bpf_run_ctx run_ctx; | |
2601 | bool is_return; | |
5c919ace | 2602 | void *data; |
adf46d88 JO |
2603 | }; |
2604 | ||
0dcac272 JO |
2605 | #ifdef CONFIG_FPROBE |
2606 | struct bpf_kprobe_multi_link { | |
2607 | struct bpf_link link; | |
2608 | struct fprobe fp; | |
2609 | unsigned long *addrs; | |
ca74823c JO |
2610 | u64 *cookies; |
2611 | u32 cnt; | |
e22061b2 JO |
2612 | u32 mods_cnt; |
2613 | struct module **mods; | |
7ac8d0d2 | 2614 | u32 flags; |
0dcac272 JO |
2615 | }; |
2616 | ||
f7098690 | 2617 | struct bpf_kprobe_multi_run_ctx { |
adf46d88 | 2618 | struct bpf_session_run_ctx session_ctx; |
f7098690 JO |
2619 | struct bpf_kprobe_multi_link *link; |
2620 | unsigned long entry_ip; | |
2621 | }; | |
2622 | ||
0236fec5 JO |
2623 | struct user_syms { |
2624 | const char **syms; | |
2625 | char *buf; | |
2626 | }; | |
2627 | ||
2628 | static int copy_user_syms(struct user_syms *us, unsigned long __user *usyms, u32 cnt) | |
2629 | { | |
2630 | unsigned long __user usymbol; | |
2631 | const char **syms = NULL; | |
2632 | char *buf = NULL, *p; | |
2633 | int err = -ENOMEM; | |
2634 | unsigned int i; | |
2635 | ||
fd58f7df | 2636 | syms = kvmalloc_array(cnt, sizeof(*syms), GFP_KERNEL); |
0236fec5 JO |
2637 | if (!syms) |
2638 | goto error; | |
2639 | ||
fd58f7df | 2640 | buf = kvmalloc_array(cnt, KSYM_NAME_LEN, GFP_KERNEL); |
0236fec5 JO |
2641 | if (!buf) |
2642 | goto error; | |
2643 | ||
2644 | for (p = buf, i = 0; i < cnt; i++) { | |
2645 | if (__get_user(usymbol, usyms + i)) { | |
2646 | err = -EFAULT; | |
2647 | goto error; | |
2648 | } | |
2649 | err = strncpy_from_user(p, (const char __user *) usymbol, KSYM_NAME_LEN); | |
2650 | if (err == KSYM_NAME_LEN) | |
2651 | err = -E2BIG; | |
2652 | if (err < 0) | |
2653 | goto error; | |
2654 | syms[i] = p; | |
2655 | p += err + 1; | |
2656 | } | |
2657 | ||
2658 | us->syms = syms; | |
2659 | us->buf = buf; | |
2660 | return 0; | |
2661 | ||
2662 | error: | |
2663 | if (err) { | |
2664 | kvfree(syms); | |
2665 | kvfree(buf); | |
2666 | } | |
2667 | return err; | |
2668 | } | |
2669 | ||
e22061b2 JO |
2670 | static void kprobe_multi_put_modules(struct module **mods, u32 cnt) |
2671 | { | |
2672 | u32 i; | |
2673 | ||
2674 | for (i = 0; i < cnt; i++) | |
2675 | module_put(mods[i]); | |
2676 | } | |
2677 | ||
0236fec5 JO |
2678 | static void free_user_syms(struct user_syms *us) |
2679 | { | |
2680 | kvfree(us->syms); | |
2681 | kvfree(us->buf); | |
2682 | } | |
2683 | ||
0dcac272 JO |
2684 | static void bpf_kprobe_multi_link_release(struct bpf_link *link) |
2685 | { | |
2686 | struct bpf_kprobe_multi_link *kmulti_link; | |
2687 | ||
2688 | kmulti_link = container_of(link, struct bpf_kprobe_multi_link, link); | |
2689 | unregister_fprobe(&kmulti_link->fp); | |
e22061b2 | 2690 | kprobe_multi_put_modules(kmulti_link->mods, kmulti_link->mods_cnt); |
0dcac272 JO |
2691 | } |
2692 | ||
2693 | static void bpf_kprobe_multi_link_dealloc(struct bpf_link *link) | |
2694 | { | |
2695 | struct bpf_kprobe_multi_link *kmulti_link; | |
2696 | ||
2697 | kmulti_link = container_of(link, struct bpf_kprobe_multi_link, link); | |
2698 | kvfree(kmulti_link->addrs); | |
ca74823c | 2699 | kvfree(kmulti_link->cookies); |
e22061b2 | 2700 | kfree(kmulti_link->mods); |
0dcac272 JO |
2701 | kfree(kmulti_link); |
2702 | } | |
2703 | ||
7ac8d0d2 YS |
2704 | static int bpf_kprobe_multi_link_fill_link_info(const struct bpf_link *link, |
2705 | struct bpf_link_info *info) | |
2706 | { | |
9fd112b1 | 2707 | u64 __user *ucookies = u64_to_user_ptr(info->kprobe_multi.cookies); |
7ac8d0d2 YS |
2708 | u64 __user *uaddrs = u64_to_user_ptr(info->kprobe_multi.addrs); |
2709 | struct bpf_kprobe_multi_link *kmulti_link; | |
2710 | u32 ucount = info->kprobe_multi.count; | |
2711 | int err = 0, i; | |
2712 | ||
2713 | if (!uaddrs ^ !ucount) | |
2714 | return -EINVAL; | |
9fd112b1 JO |
2715 | if (ucookies && !ucount) |
2716 | return -EINVAL; | |
7ac8d0d2 YS |
2717 | |
2718 | kmulti_link = container_of(link, struct bpf_kprobe_multi_link, link); | |
2719 | info->kprobe_multi.count = kmulti_link->cnt; | |
2720 | info->kprobe_multi.flags = kmulti_link->flags; | |
e2b2cd59 | 2721 | info->kprobe_multi.missed = kmulti_link->fp.nmissed; |
7ac8d0d2 YS |
2722 | |
2723 | if (!uaddrs) | |
2724 | return 0; | |
2725 | if (ucount < kmulti_link->cnt) | |
2726 | err = -ENOSPC; | |
2727 | else | |
2728 | ucount = kmulti_link->cnt; | |
2729 | ||
9fd112b1 JO |
2730 | if (ucookies) { |
2731 | if (kmulti_link->cookies) { | |
2732 | if (copy_to_user(ucookies, kmulti_link->cookies, ucount * sizeof(u64))) | |
2733 | return -EFAULT; | |
2734 | } else { | |
2735 | for (i = 0; i < ucount; i++) { | |
2736 | if (put_user(0, ucookies + i)) | |
2737 | return -EFAULT; | |
2738 | } | |
2739 | } | |
2740 | } | |
2741 | ||
7ac8d0d2 YS |
2742 | if (kallsyms_show_value(current_cred())) { |
2743 | if (copy_to_user(uaddrs, kmulti_link->addrs, ucount * sizeof(u64))) | |
2744 | return -EFAULT; | |
2745 | } else { | |
2746 | for (i = 0; i < ucount; i++) { | |
2747 | if (put_user(0, uaddrs + i)) | |
2748 | return -EFAULT; | |
2749 | } | |
2750 | } | |
2751 | return err; | |
2752 | } | |
2753 | ||
0dcac272 JO |
2754 | static const struct bpf_link_ops bpf_kprobe_multi_link_lops = { |
2755 | .release = bpf_kprobe_multi_link_release, | |
1a80dbcb | 2756 | .dealloc_deferred = bpf_kprobe_multi_link_dealloc, |
7ac8d0d2 | 2757 | .fill_link_info = bpf_kprobe_multi_link_fill_link_info, |
0dcac272 JO |
2758 | }; |
2759 | ||
ca74823c JO |
2760 | static void bpf_kprobe_multi_cookie_swap(void *a, void *b, int size, const void *priv) |
2761 | { | |
2762 | const struct bpf_kprobe_multi_link *link = priv; | |
2763 | unsigned long *addr_a = a, *addr_b = b; | |
2764 | u64 *cookie_a, *cookie_b; | |
ca74823c JO |
2765 | |
2766 | cookie_a = link->cookies + (addr_a - link->addrs); | |
2767 | cookie_b = link->cookies + (addr_b - link->addrs); | |
2768 | ||
2769 | /* swap addr_a/addr_b and cookie_a/cookie_b values */ | |
11e17ae4 JC |
2770 | swap(*addr_a, *addr_b); |
2771 | swap(*cookie_a, *cookie_b); | |
ca74823c JO |
2772 | } |
2773 | ||
1a1b0716 | 2774 | static int bpf_kprobe_multi_addrs_cmp(const void *a, const void *b) |
ca74823c JO |
2775 | { |
2776 | const unsigned long *addr_a = a, *addr_b = b; | |
2777 | ||
2778 | if (*addr_a == *addr_b) | |
2779 | return 0; | |
2780 | return *addr_a < *addr_b ? -1 : 1; | |
2781 | } | |
2782 | ||
2783 | static int bpf_kprobe_multi_cookie_cmp(const void *a, const void *b, const void *priv) | |
2784 | { | |
1a1b0716 | 2785 | return bpf_kprobe_multi_addrs_cmp(a, b); |
ca74823c JO |
2786 | } |
2787 | ||
f7098690 | 2788 | static u64 bpf_kprobe_multi_cookie(struct bpf_run_ctx *ctx) |
ca74823c | 2789 | { |
f7098690 | 2790 | struct bpf_kprobe_multi_run_ctx *run_ctx; |
ca74823c | 2791 | struct bpf_kprobe_multi_link *link; |
f7098690 | 2792 | u64 *cookie, entry_ip; |
ca74823c | 2793 | unsigned long *addr; |
ca74823c JO |
2794 | |
2795 | if (WARN_ON_ONCE(!ctx)) | |
2796 | return 0; | |
adf46d88 JO |
2797 | run_ctx = container_of(current->bpf_ctx, struct bpf_kprobe_multi_run_ctx, |
2798 | session_ctx.run_ctx); | |
f7098690 | 2799 | link = run_ctx->link; |
ca74823c JO |
2800 | if (!link->cookies) |
2801 | return 0; | |
f7098690 JO |
2802 | entry_ip = run_ctx->entry_ip; |
2803 | addr = bsearch(&entry_ip, link->addrs, link->cnt, sizeof(entry_ip), | |
1a1b0716 | 2804 | bpf_kprobe_multi_addrs_cmp); |
ca74823c JO |
2805 | if (!addr) |
2806 | return 0; | |
2807 | cookie = link->cookies + (addr - link->addrs); | |
2808 | return *cookie; | |
2809 | } | |
2810 | ||
f7098690 JO |
2811 | static u64 bpf_kprobe_multi_entry_ip(struct bpf_run_ctx *ctx) |
2812 | { | |
2813 | struct bpf_kprobe_multi_run_ctx *run_ctx; | |
2814 | ||
adf46d88 JO |
2815 | run_ctx = container_of(current->bpf_ctx, struct bpf_kprobe_multi_run_ctx, |
2816 | session_ctx.run_ctx); | |
f7098690 JO |
2817 | return run_ctx->entry_ip; |
2818 | } | |
2819 | ||
0dcac272 JO |
2820 | static int |
2821 | kprobe_multi_link_prog_run(struct bpf_kprobe_multi_link *link, | |
adf46d88 | 2822 | unsigned long entry_ip, struct pt_regs *regs, |
5c919ace | 2823 | bool is_return, void *data) |
0dcac272 | 2824 | { |
f7098690 | 2825 | struct bpf_kprobe_multi_run_ctx run_ctx = { |
adf46d88 JO |
2826 | .session_ctx = { |
2827 | .is_return = is_return, | |
5c919ace | 2828 | .data = data, |
adf46d88 | 2829 | }, |
f7098690 JO |
2830 | .link = link, |
2831 | .entry_ip = entry_ip, | |
2832 | }; | |
ca74823c | 2833 | struct bpf_run_ctx *old_run_ctx; |
0dcac272 JO |
2834 | int err; |
2835 | ||
2836 | if (unlikely(__this_cpu_inc_return(bpf_prog_active) != 1)) { | |
f915fcb3 | 2837 | bpf_prog_inc_misses_counter(link->link.prog); |
0dcac272 JO |
2838 | err = 0; |
2839 | goto out; | |
2840 | } | |
2841 | ||
2842 | migrate_disable(); | |
2843 | rcu_read_lock(); | |
adf46d88 | 2844 | old_run_ctx = bpf_set_run_ctx(&run_ctx.session_ctx.run_ctx); |
0dcac272 | 2845 | err = bpf_prog_run(link->link.prog, regs); |
ca74823c | 2846 | bpf_reset_run_ctx(old_run_ctx); |
0dcac272 JO |
2847 | rcu_read_unlock(); |
2848 | migrate_enable(); | |
2849 | ||
2850 | out: | |
2851 | __this_cpu_dec(bpf_prog_active); | |
2852 | return err; | |
2853 | } | |
2854 | ||
39d95420 | 2855 | static int |
c09eb2e5 | 2856 | kprobe_multi_link_handler(struct fprobe *fp, unsigned long fentry_ip, |
cb16330d MHG |
2857 | unsigned long ret_ip, struct pt_regs *regs, |
2858 | void *data) | |
0dcac272 | 2859 | { |
0dcac272 | 2860 | struct bpf_kprobe_multi_link *link; |
535a3692 | 2861 | int err; |
0dcac272 | 2862 | |
39d95420 | 2863 | link = container_of(fp, struct bpf_kprobe_multi_link, fp); |
5c919ace | 2864 | err = kprobe_multi_link_prog_run(link, get_entry_ip(fentry_ip), regs, false, data); |
535a3692 | 2865 | return is_kprobe_session(link->link.prog) ? err : 0; |
39d95420 MHG |
2866 | } |
2867 | ||
2868 | static void | |
2869 | kprobe_multi_link_exit_handler(struct fprobe *fp, unsigned long fentry_ip, | |
cb16330d MHG |
2870 | unsigned long ret_ip, struct pt_regs *regs, |
2871 | void *data) | |
0dcac272 | 2872 | { |
0dcac272 JO |
2873 | struct bpf_kprobe_multi_link *link; |
2874 | ||
0dcac272 | 2875 | link = container_of(fp, struct bpf_kprobe_multi_link, fp); |
5c919ace | 2876 | kprobe_multi_link_prog_run(link, get_entry_ip(fentry_ip), regs, true, data); |
0dcac272 JO |
2877 | } |
2878 | ||
eb5fb032 | 2879 | static int symbols_cmp_r(const void *a, const void *b, const void *priv) |
0dcac272 | 2880 | { |
0236fec5 JO |
2881 | const char **str_a = (const char **) a; |
2882 | const char **str_b = (const char **) b; | |
0dcac272 | 2883 | |
0236fec5 | 2884 | return strcmp(*str_a, *str_b); |
0dcac272 JO |
2885 | } |
2886 | ||
eb5fb032 JO |
2887 | struct multi_symbols_sort { |
2888 | const char **funcs; | |
2889 | u64 *cookies; | |
2890 | }; | |
2891 | ||
2892 | static void symbols_swap_r(void *a, void *b, int size, const void *priv) | |
2893 | { | |
2894 | const struct multi_symbols_sort *data = priv; | |
2895 | const char **name_a = a, **name_b = b; | |
2896 | ||
2897 | swap(*name_a, *name_b); | |
2898 | ||
2899 | /* If defined, swap also related cookies. */ | |
2900 | if (data->cookies) { | |
2901 | u64 *cookie_a, *cookie_b; | |
2902 | ||
2903 | cookie_a = data->cookies + (name_a - data->funcs); | |
2904 | cookie_b = data->cookies + (name_b - data->funcs); | |
2905 | swap(*cookie_a, *cookie_b); | |
2906 | } | |
2907 | } | |
2908 | ||
6a5f2d6e | 2909 | struct modules_array { |
e22061b2 JO |
2910 | struct module **mods; |
2911 | int mods_cnt; | |
2912 | int mods_cap; | |
2913 | }; | |
2914 | ||
6a5f2d6e | 2915 | static int add_module(struct modules_array *arr, struct module *mod) |
e22061b2 | 2916 | { |
e22061b2 JO |
2917 | struct module **mods; |
2918 | ||
6a5f2d6e JO |
2919 | if (arr->mods_cnt == arr->mods_cap) { |
2920 | arr->mods_cap = max(16, arr->mods_cap * 3 / 2); | |
2921 | mods = krealloc_array(arr->mods, arr->mods_cap, sizeof(*mods), GFP_KERNEL); | |
e22061b2 JO |
2922 | if (!mods) |
2923 | return -ENOMEM; | |
6a5f2d6e | 2924 | arr->mods = mods; |
e22061b2 JO |
2925 | } |
2926 | ||
6a5f2d6e JO |
2927 | arr->mods[arr->mods_cnt] = mod; |
2928 | arr->mods_cnt++; | |
e22061b2 JO |
2929 | return 0; |
2930 | } | |
2931 | ||
6a5f2d6e JO |
2932 | static bool has_module(struct modules_array *arr, struct module *mod) |
2933 | { | |
2934 | int i; | |
2935 | ||
2936 | for (i = arr->mods_cnt - 1; i >= 0; i--) { | |
2937 | if (arr->mods[i] == mod) | |
2938 | return true; | |
2939 | } | |
2940 | return false; | |
2941 | } | |
2942 | ||
e22061b2 JO |
2943 | static int get_modules_for_addrs(struct module ***mods, unsigned long *addrs, u32 addrs_cnt) |
2944 | { | |
6a5f2d6e JO |
2945 | struct modules_array arr = {}; |
2946 | u32 i, err = 0; | |
2947 | ||
2948 | for (i = 0; i < addrs_cnt; i++) { | |
2949 | struct module *mod; | |
2950 | ||
2951 | preempt_disable(); | |
2952 | mod = __module_address(addrs[i]); | |
2953 | /* Either no module or we it's already stored */ | |
2954 | if (!mod || has_module(&arr, mod)) { | |
2955 | preempt_enable(); | |
2956 | continue; | |
2957 | } | |
2958 | if (!try_module_get(mod)) | |
2959 | err = -EINVAL; | |
2960 | preempt_enable(); | |
2961 | if (err) | |
2962 | break; | |
2963 | err = add_module(&arr, mod); | |
2964 | if (err) { | |
2965 | module_put(mod); | |
2966 | break; | |
2967 | } | |
2968 | } | |
e22061b2 JO |
2969 | |
2970 | /* We return either err < 0 in case of error, ... */ | |
e22061b2 | 2971 | if (err) { |
6a5f2d6e JO |
2972 | kprobe_multi_put_modules(arr.mods, arr.mods_cnt); |
2973 | kfree(arr.mods); | |
e22061b2 JO |
2974 | return err; |
2975 | } | |
2976 | ||
2977 | /* or number of modules found if everything is ok. */ | |
6a5f2d6e JO |
2978 | *mods = arr.mods; |
2979 | return arr.mods_cnt; | |
e22061b2 JO |
2980 | } |
2981 | ||
41bc46c1 JO |
2982 | static int addrs_check_error_injection_list(unsigned long *addrs, u32 cnt) |
2983 | { | |
2984 | u32 i; | |
2985 | ||
2986 | for (i = 0; i < cnt; i++) { | |
2987 | if (!within_error_injection_list(addrs[i])) | |
2988 | return -EINVAL; | |
2989 | } | |
2990 | return 0; | |
2991 | } | |
2992 | ||
0dcac272 JO |
2993 | int bpf_kprobe_multi_link_attach(const union bpf_attr *attr, struct bpf_prog *prog) |
2994 | { | |
2995 | struct bpf_kprobe_multi_link *link = NULL; | |
2996 | struct bpf_link_primer link_primer; | |
ca74823c | 2997 | void __user *ucookies; |
0dcac272 JO |
2998 | unsigned long *addrs; |
2999 | u32 flags, cnt, size; | |
3000 | void __user *uaddrs; | |
ca74823c | 3001 | u64 *cookies = NULL; |
0dcac272 JO |
3002 | void __user *usyms; |
3003 | int err; | |
3004 | ||
3005 | /* no support for 32bit archs yet */ | |
3006 | if (sizeof(u64) != sizeof(void *)) | |
3007 | return -EOPNOTSUPP; | |
3008 | ||
535a3692 | 3009 | if (!is_kprobe_multi(prog)) |
0dcac272 JO |
3010 | return -EINVAL; |
3011 | ||
3012 | flags = attr->link_create.kprobe_multi.flags; | |
3013 | if (flags & ~BPF_F_KPROBE_MULTI_RETURN) | |
3014 | return -EINVAL; | |
3015 | ||
3016 | uaddrs = u64_to_user_ptr(attr->link_create.kprobe_multi.addrs); | |
3017 | usyms = u64_to_user_ptr(attr->link_create.kprobe_multi.syms); | |
3018 | if (!!uaddrs == !!usyms) | |
3019 | return -EINVAL; | |
3020 | ||
3021 | cnt = attr->link_create.kprobe_multi.cnt; | |
3022 | if (!cnt) | |
3023 | return -EINVAL; | |
d6d1e6c1 HT |
3024 | if (cnt > MAX_KPROBE_MULTI_CNT) |
3025 | return -E2BIG; | |
0dcac272 JO |
3026 | |
3027 | size = cnt * sizeof(*addrs); | |
fd58f7df | 3028 | addrs = kvmalloc_array(cnt, sizeof(*addrs), GFP_KERNEL); |
0dcac272 JO |
3029 | if (!addrs) |
3030 | return -ENOMEM; | |
3031 | ||
eb5fb032 JO |
3032 | ucookies = u64_to_user_ptr(attr->link_create.kprobe_multi.cookies); |
3033 | if (ucookies) { | |
3034 | cookies = kvmalloc_array(cnt, sizeof(*addrs), GFP_KERNEL); | |
3035 | if (!cookies) { | |
3036 | err = -ENOMEM; | |
3037 | goto error; | |
3038 | } | |
3039 | if (copy_from_user(cookies, ucookies, size)) { | |
3040 | err = -EFAULT; | |
3041 | goto error; | |
3042 | } | |
3043 | } | |
3044 | ||
0dcac272 JO |
3045 | if (uaddrs) { |
3046 | if (copy_from_user(addrs, uaddrs, size)) { | |
3047 | err = -EFAULT; | |
3048 | goto error; | |
3049 | } | |
3050 | } else { | |
eb5fb032 JO |
3051 | struct multi_symbols_sort data = { |
3052 | .cookies = cookies, | |
3053 | }; | |
0236fec5 JO |
3054 | struct user_syms us; |
3055 | ||
3056 | err = copy_user_syms(&us, usyms, cnt); | |
3057 | if (err) | |
3058 | goto error; | |
3059 | ||
eb5fb032 JO |
3060 | if (cookies) |
3061 | data.funcs = us.syms; | |
3062 | ||
3063 | sort_r(us.syms, cnt, sizeof(*us.syms), symbols_cmp_r, | |
3064 | symbols_swap_r, &data); | |
3065 | ||
0236fec5 JO |
3066 | err = ftrace_lookup_symbols(us.syms, cnt, addrs); |
3067 | free_user_syms(&us); | |
0dcac272 JO |
3068 | if (err) |
3069 | goto error; | |
3070 | } | |
3071 | ||
41bc46c1 JO |
3072 | if (prog->kprobe_override && addrs_check_error_injection_list(addrs, cnt)) { |
3073 | err = -EINVAL; | |
3074 | goto error; | |
3075 | } | |
3076 | ||
0dcac272 JO |
3077 | link = kzalloc(sizeof(*link), GFP_KERNEL); |
3078 | if (!link) { | |
3079 | err = -ENOMEM; | |
3080 | goto error; | |
3081 | } | |
3082 | ||
3083 | bpf_link_init(&link->link, BPF_LINK_TYPE_KPROBE_MULTI, | |
3084 | &bpf_kprobe_multi_link_lops, prog); | |
3085 | ||
3086 | err = bpf_link_prime(&link->link, &link_primer); | |
3087 | if (err) | |
3088 | goto error; | |
3089 | ||
535a3692 | 3090 | if (!(flags & BPF_F_KPROBE_MULTI_RETURN)) |
0dcac272 | 3091 | link->fp.entry_handler = kprobe_multi_link_handler; |
535a3692 JO |
3092 | if ((flags & BPF_F_KPROBE_MULTI_RETURN) || is_kprobe_session(prog)) |
3093 | link->fp.exit_handler = kprobe_multi_link_exit_handler; | |
5c919ace JO |
3094 | if (is_kprobe_session(prog)) |
3095 | link->fp.entry_data_size = sizeof(u64); | |
0dcac272 JO |
3096 | |
3097 | link->addrs = addrs; | |
ca74823c JO |
3098 | link->cookies = cookies; |
3099 | link->cnt = cnt; | |
7ac8d0d2 | 3100 | link->flags = flags; |
ca74823c JO |
3101 | |
3102 | if (cookies) { | |
3103 | /* | |
3104 | * Sorting addresses will trigger sorting cookies as well | |
3105 | * (check bpf_kprobe_multi_cookie_swap). This way we can | |
3106 | * find cookie based on the address in bpf_get_attach_cookie | |
3107 | * helper. | |
3108 | */ | |
3109 | sort_r(addrs, cnt, sizeof(*addrs), | |
3110 | bpf_kprobe_multi_cookie_cmp, | |
3111 | bpf_kprobe_multi_cookie_swap, | |
3112 | link); | |
e22061b2 JO |
3113 | } |
3114 | ||
3115 | err = get_modules_for_addrs(&link->mods, addrs, cnt); | |
3116 | if (err < 0) { | |
3117 | bpf_link_cleanup(&link_primer); | |
3118 | return err; | |
ca74823c | 3119 | } |
e22061b2 | 3120 | link->mods_cnt = err; |
0dcac272 JO |
3121 | |
3122 | err = register_fprobe_ips(&link->fp, addrs, cnt); | |
3123 | if (err) { | |
e22061b2 | 3124 | kprobe_multi_put_modules(link->mods, link->mods_cnt); |
0dcac272 JO |
3125 | bpf_link_cleanup(&link_primer); |
3126 | return err; | |
3127 | } | |
3128 | ||
3129 | return bpf_link_settle(&link_primer); | |
3130 | ||
3131 | error: | |
3132 | kfree(link); | |
3133 | kvfree(addrs); | |
ca74823c | 3134 | kvfree(cookies); |
0dcac272 JO |
3135 | return err; |
3136 | } | |
3137 | #else /* !CONFIG_FPROBE */ | |
3138 | int bpf_kprobe_multi_link_attach(const union bpf_attr *attr, struct bpf_prog *prog) | |
3139 | { | |
3140 | return -EOPNOTSUPP; | |
3141 | } | |
f7098690 JO |
3142 | static u64 bpf_kprobe_multi_cookie(struct bpf_run_ctx *ctx) |
3143 | { | |
3144 | return 0; | |
3145 | } | |
3146 | static u64 bpf_kprobe_multi_entry_ip(struct bpf_run_ctx *ctx) | |
ca74823c JO |
3147 | { |
3148 | return 0; | |
3149 | } | |
0dcac272 | 3150 | #endif |
89ae89f5 JO |
3151 | |
3152 | #ifdef CONFIG_UPROBES | |
3153 | struct bpf_uprobe_multi_link; | |
3154 | ||
3155 | struct bpf_uprobe { | |
3156 | struct bpf_uprobe_multi_link *link; | |
3157 | loff_t offset; | |
4930b7f5 | 3158 | unsigned long ref_ctr_offset; |
0b779b61 | 3159 | u64 cookie; |
89ae89f5 JO |
3160 | struct uprobe_consumer consumer; |
3161 | }; | |
3162 | ||
3163 | struct bpf_uprobe_multi_link { | |
3164 | struct path path; | |
3165 | struct bpf_link link; | |
3166 | u32 cnt; | |
e56fdbfb | 3167 | u32 flags; |
89ae89f5 | 3168 | struct bpf_uprobe *uprobes; |
b733eead | 3169 | struct task_struct *task; |
89ae89f5 JO |
3170 | }; |
3171 | ||
3172 | struct bpf_uprobe_multi_run_ctx { | |
3173 | struct bpf_run_ctx run_ctx; | |
3174 | unsigned long entry_ip; | |
0b779b61 | 3175 | struct bpf_uprobe *uprobe; |
89ae89f5 JO |
3176 | }; |
3177 | ||
3178 | static void bpf_uprobe_unregister(struct path *path, struct bpf_uprobe *uprobes, | |
3179 | u32 cnt) | |
3180 | { | |
3181 | u32 i; | |
3182 | ||
3183 | for (i = 0; i < cnt; i++) { | |
3184 | uprobe_unregister(d_real_inode(path->dentry), uprobes[i].offset, | |
3185 | &uprobes[i].consumer); | |
3186 | } | |
3187 | } | |
3188 | ||
3189 | static void bpf_uprobe_multi_link_release(struct bpf_link *link) | |
3190 | { | |
3191 | struct bpf_uprobe_multi_link *umulti_link; | |
3192 | ||
3193 | umulti_link = container_of(link, struct bpf_uprobe_multi_link, link); | |
3194 | bpf_uprobe_unregister(&umulti_link->path, umulti_link->uprobes, umulti_link->cnt); | |
e9c856ca AN |
3195 | if (umulti_link->task) |
3196 | put_task_struct(umulti_link->task); | |
3197 | path_put(&umulti_link->path); | |
89ae89f5 JO |
3198 | } |
3199 | ||
3200 | static void bpf_uprobe_multi_link_dealloc(struct bpf_link *link) | |
3201 | { | |
3202 | struct bpf_uprobe_multi_link *umulti_link; | |
3203 | ||
3204 | umulti_link = container_of(link, struct bpf_uprobe_multi_link, link); | |
89ae89f5 JO |
3205 | kvfree(umulti_link->uprobes); |
3206 | kfree(umulti_link); | |
3207 | } | |
3208 | ||
e56fdbfb JO |
3209 | static int bpf_uprobe_multi_link_fill_link_info(const struct bpf_link *link, |
3210 | struct bpf_link_info *info) | |
3211 | { | |
3212 | u64 __user *uref_ctr_offsets = u64_to_user_ptr(info->uprobe_multi.ref_ctr_offsets); | |
3213 | u64 __user *ucookies = u64_to_user_ptr(info->uprobe_multi.cookies); | |
3214 | u64 __user *uoffsets = u64_to_user_ptr(info->uprobe_multi.offsets); | |
3215 | u64 __user *upath = u64_to_user_ptr(info->uprobe_multi.path); | |
3216 | u32 upath_size = info->uprobe_multi.path_size; | |
3217 | struct bpf_uprobe_multi_link *umulti_link; | |
3218 | u32 ucount = info->uprobe_multi.count; | |
3219 | int err = 0, i; | |
3220 | long left; | |
3221 | ||
3222 | if (!upath ^ !upath_size) | |
3223 | return -EINVAL; | |
3224 | ||
3225 | if ((uoffsets || uref_ctr_offsets || ucookies) && !ucount) | |
3226 | return -EINVAL; | |
3227 | ||
3228 | umulti_link = container_of(link, struct bpf_uprobe_multi_link, link); | |
3229 | info->uprobe_multi.count = umulti_link->cnt; | |
3230 | info->uprobe_multi.flags = umulti_link->flags; | |
3231 | info->uprobe_multi.pid = umulti_link->task ? | |
3232 | task_pid_nr_ns(umulti_link->task, task_active_pid_ns(current)) : 0; | |
3233 | ||
3234 | if (upath) { | |
3235 | char *p, *buf; | |
3236 | ||
3237 | upath_size = min_t(u32, upath_size, PATH_MAX); | |
3238 | ||
3239 | buf = kmalloc(upath_size, GFP_KERNEL); | |
3240 | if (!buf) | |
3241 | return -ENOMEM; | |
3242 | p = d_path(&umulti_link->path, buf, upath_size); | |
3243 | if (IS_ERR(p)) { | |
3244 | kfree(buf); | |
3245 | return PTR_ERR(p); | |
3246 | } | |
3247 | upath_size = buf + upath_size - p; | |
3248 | left = copy_to_user(upath, p, upath_size); | |
3249 | kfree(buf); | |
3250 | if (left) | |
3251 | return -EFAULT; | |
3252 | info->uprobe_multi.path_size = upath_size; | |
3253 | } | |
3254 | ||
3255 | if (!uoffsets && !ucookies && !uref_ctr_offsets) | |
3256 | return 0; | |
3257 | ||
3258 | if (ucount < umulti_link->cnt) | |
3259 | err = -ENOSPC; | |
3260 | else | |
3261 | ucount = umulti_link->cnt; | |
3262 | ||
3263 | for (i = 0; i < ucount; i++) { | |
3264 | if (uoffsets && | |
3265 | put_user(umulti_link->uprobes[i].offset, uoffsets + i)) | |
3266 | return -EFAULT; | |
3267 | if (uref_ctr_offsets && | |
3268 | put_user(umulti_link->uprobes[i].ref_ctr_offset, uref_ctr_offsets + i)) | |
3269 | return -EFAULT; | |
3270 | if (ucookies && | |
3271 | put_user(umulti_link->uprobes[i].cookie, ucookies + i)) | |
3272 | return -EFAULT; | |
3273 | } | |
3274 | ||
3275 | return err; | |
3276 | } | |
3277 | ||
89ae89f5 JO |
3278 | static const struct bpf_link_ops bpf_uprobe_multi_link_lops = { |
3279 | .release = bpf_uprobe_multi_link_release, | |
1a80dbcb | 3280 | .dealloc_deferred = bpf_uprobe_multi_link_dealloc, |
e56fdbfb | 3281 | .fill_link_info = bpf_uprobe_multi_link_fill_link_info, |
89ae89f5 JO |
3282 | }; |
3283 | ||
3284 | static int uprobe_prog_run(struct bpf_uprobe *uprobe, | |
3285 | unsigned long entry_ip, | |
3286 | struct pt_regs *regs) | |
3287 | { | |
3288 | struct bpf_uprobe_multi_link *link = uprobe->link; | |
3289 | struct bpf_uprobe_multi_run_ctx run_ctx = { | |
3290 | .entry_ip = entry_ip, | |
0b779b61 | 3291 | .uprobe = uprobe, |
89ae89f5 JO |
3292 | }; |
3293 | struct bpf_prog *prog = link->link.prog; | |
66c84731 | 3294 | bool sleepable = prog->sleepable; |
89ae89f5 JO |
3295 | struct bpf_run_ctx *old_run_ctx; |
3296 | int err = 0; | |
3297 | ||
46ba0e49 | 3298 | if (link->task && current->mm != link->task->mm) |
b733eead JO |
3299 | return 0; |
3300 | ||
89ae89f5 JO |
3301 | if (sleepable) |
3302 | rcu_read_lock_trace(); | |
3303 | else | |
3304 | rcu_read_lock(); | |
3305 | ||
3306 | migrate_disable(); | |
3307 | ||
3308 | old_run_ctx = bpf_set_run_ctx(&run_ctx.run_ctx); | |
3309 | err = bpf_prog_run(link->link.prog, regs); | |
3310 | bpf_reset_run_ctx(old_run_ctx); | |
3311 | ||
3312 | migrate_enable(); | |
3313 | ||
3314 | if (sleepable) | |
3315 | rcu_read_unlock_trace(); | |
3316 | else | |
3317 | rcu_read_unlock(); | |
3318 | return err; | |
3319 | } | |
3320 | ||
b733eead JO |
3321 | static bool |
3322 | uprobe_multi_link_filter(struct uprobe_consumer *con, enum uprobe_filter_ctx ctx, | |
3323 | struct mm_struct *mm) | |
3324 | { | |
3325 | struct bpf_uprobe *uprobe; | |
3326 | ||
3327 | uprobe = container_of(con, struct bpf_uprobe, consumer); | |
3328 | return uprobe->link->task->mm == mm; | |
3329 | } | |
3330 | ||
89ae89f5 JO |
3331 | static int |
3332 | uprobe_multi_link_handler(struct uprobe_consumer *con, struct pt_regs *regs) | |
3333 | { | |
3334 | struct bpf_uprobe *uprobe; | |
3335 | ||
3336 | uprobe = container_of(con, struct bpf_uprobe, consumer); | |
3337 | return uprobe_prog_run(uprobe, instruction_pointer(regs), regs); | |
3338 | } | |
3339 | ||
3340 | static int | |
3341 | uprobe_multi_link_ret_handler(struct uprobe_consumer *con, unsigned long func, struct pt_regs *regs) | |
3342 | { | |
3343 | struct bpf_uprobe *uprobe; | |
3344 | ||
3345 | uprobe = container_of(con, struct bpf_uprobe, consumer); | |
3346 | return uprobe_prog_run(uprobe, func, regs); | |
3347 | } | |
3348 | ||
686328d8 JO |
3349 | static u64 bpf_uprobe_multi_entry_ip(struct bpf_run_ctx *ctx) |
3350 | { | |
3351 | struct bpf_uprobe_multi_run_ctx *run_ctx; | |
3352 | ||
3353 | run_ctx = container_of(current->bpf_ctx, struct bpf_uprobe_multi_run_ctx, run_ctx); | |
3354 | return run_ctx->entry_ip; | |
3355 | } | |
3356 | ||
0b779b61 JO |
3357 | static u64 bpf_uprobe_multi_cookie(struct bpf_run_ctx *ctx) |
3358 | { | |
3359 | struct bpf_uprobe_multi_run_ctx *run_ctx; | |
3360 | ||
3361 | run_ctx = container_of(current->bpf_ctx, struct bpf_uprobe_multi_run_ctx, run_ctx); | |
3362 | return run_ctx->uprobe->cookie; | |
3363 | } | |
3364 | ||
89ae89f5 JO |
3365 | int bpf_uprobe_multi_link_attach(const union bpf_attr *attr, struct bpf_prog *prog) |
3366 | { | |
3367 | struct bpf_uprobe_multi_link *link = NULL; | |
3368 | unsigned long __user *uref_ctr_offsets; | |
89ae89f5 JO |
3369 | struct bpf_link_primer link_primer; |
3370 | struct bpf_uprobe *uprobes = NULL; | |
b733eead | 3371 | struct task_struct *task = NULL; |
89ae89f5 | 3372 | unsigned long __user *uoffsets; |
0b779b61 | 3373 | u64 __user *ucookies; |
89ae89f5 JO |
3374 | void __user *upath; |
3375 | u32 flags, cnt, i; | |
3376 | struct path path; | |
3377 | char *name; | |
b733eead | 3378 | pid_t pid; |
89ae89f5 JO |
3379 | int err; |
3380 | ||
3381 | /* no support for 32bit archs yet */ | |
3382 | if (sizeof(u64) != sizeof(void *)) | |
3383 | return -EOPNOTSUPP; | |
3384 | ||
3385 | if (prog->expected_attach_type != BPF_TRACE_UPROBE_MULTI) | |
3386 | return -EINVAL; | |
3387 | ||
3388 | flags = attr->link_create.uprobe_multi.flags; | |
3389 | if (flags & ~BPF_F_UPROBE_MULTI_RETURN) | |
3390 | return -EINVAL; | |
3391 | ||
3392 | /* | |
3393 | * path, offsets and cnt are mandatory, | |
0b779b61 | 3394 | * ref_ctr_offsets and cookies are optional |
89ae89f5 JO |
3395 | */ |
3396 | upath = u64_to_user_ptr(attr->link_create.uprobe_multi.path); | |
3397 | uoffsets = u64_to_user_ptr(attr->link_create.uprobe_multi.offsets); | |
3398 | cnt = attr->link_create.uprobe_multi.cnt; | |
46ba0e49 | 3399 | pid = attr->link_create.uprobe_multi.pid; |
89ae89f5 | 3400 | |
46ba0e49 | 3401 | if (!upath || !uoffsets || !cnt || pid < 0) |
89ae89f5 | 3402 | return -EINVAL; |
8b2efe51 HT |
3403 | if (cnt > MAX_UPROBE_MULTI_CNT) |
3404 | return -E2BIG; | |
89ae89f5 JO |
3405 | |
3406 | uref_ctr_offsets = u64_to_user_ptr(attr->link_create.uprobe_multi.ref_ctr_offsets); | |
0b779b61 | 3407 | ucookies = u64_to_user_ptr(attr->link_create.uprobe_multi.cookies); |
89ae89f5 JO |
3408 | |
3409 | name = strndup_user(upath, PATH_MAX); | |
3410 | if (IS_ERR(name)) { | |
3411 | err = PTR_ERR(name); | |
3412 | return err; | |
3413 | } | |
3414 | ||
3415 | err = kern_path(name, LOOKUP_FOLLOW, &path); | |
3416 | kfree(name); | |
3417 | if (err) | |
3418 | return err; | |
3419 | ||
3420 | if (!d_is_reg(path.dentry)) { | |
3421 | err = -EBADF; | |
3422 | goto error_path_put; | |
3423 | } | |
3424 | ||
b733eead | 3425 | if (pid) { |
46ba0e49 | 3426 | task = get_pid_task(find_vpid(pid), PIDTYPE_TGID); |
57eb5e1c JO |
3427 | if (!task) { |
3428 | err = -ESRCH; | |
b733eead | 3429 | goto error_path_put; |
57eb5e1c | 3430 | } |
b733eead JO |
3431 | } |
3432 | ||
89ae89f5 JO |
3433 | err = -ENOMEM; |
3434 | ||
3435 | link = kzalloc(sizeof(*link), GFP_KERNEL); | |
3436 | uprobes = kvcalloc(cnt, sizeof(*uprobes), GFP_KERNEL); | |
3437 | ||
3438 | if (!uprobes || !link) | |
3439 | goto error_free; | |
3440 | ||
89ae89f5 | 3441 | for (i = 0; i < cnt; i++) { |
3983c002 | 3442 | if (__get_user(uprobes[i].offset, uoffsets + i)) { |
0b779b61 JO |
3443 | err = -EFAULT; |
3444 | goto error_free; | |
3445 | } | |
3983c002 JO |
3446 | if (uprobes[i].offset < 0) { |
3447 | err = -EINVAL; | |
3448 | goto error_free; | |
3449 | } | |
4930b7f5 | 3450 | if (uref_ctr_offsets && __get_user(uprobes[i].ref_ctr_offset, uref_ctr_offsets + i)) { |
89ae89f5 JO |
3451 | err = -EFAULT; |
3452 | goto error_free; | |
3453 | } | |
3983c002 | 3454 | if (ucookies && __get_user(uprobes[i].cookie, ucookies + i)) { |
89ae89f5 JO |
3455 | err = -EFAULT; |
3456 | goto error_free; | |
3457 | } | |
3458 | ||
3459 | uprobes[i].link = link; | |
3460 | ||
3461 | if (flags & BPF_F_UPROBE_MULTI_RETURN) | |
3462 | uprobes[i].consumer.ret_handler = uprobe_multi_link_ret_handler; | |
3463 | else | |
3464 | uprobes[i].consumer.handler = uprobe_multi_link_handler; | |
b733eead JO |
3465 | |
3466 | if (pid) | |
3467 | uprobes[i].consumer.filter = uprobe_multi_link_filter; | |
89ae89f5 JO |
3468 | } |
3469 | ||
3470 | link->cnt = cnt; | |
3471 | link->uprobes = uprobes; | |
3472 | link->path = path; | |
b733eead | 3473 | link->task = task; |
e56fdbfb | 3474 | link->flags = flags; |
89ae89f5 JO |
3475 | |
3476 | bpf_link_init(&link->link, BPF_LINK_TYPE_UPROBE_MULTI, | |
3477 | &bpf_uprobe_multi_link_lops, prog); | |
3478 | ||
3479 | for (i = 0; i < cnt; i++) { | |
3480 | err = uprobe_register_refctr(d_real_inode(link->path.dentry), | |
3481 | uprobes[i].offset, | |
4930b7f5 | 3482 | uprobes[i].ref_ctr_offset, |
89ae89f5 JO |
3483 | &uprobes[i].consumer); |
3484 | if (err) { | |
3485 | bpf_uprobe_unregister(&path, uprobes, i); | |
3486 | goto error_free; | |
3487 | } | |
3488 | } | |
3489 | ||
3490 | err = bpf_link_prime(&link->link, &link_primer); | |
3491 | if (err) | |
3492 | goto error_free; | |
3493 | ||
89ae89f5 JO |
3494 | return bpf_link_settle(&link_primer); |
3495 | ||
3496 | error_free: | |
89ae89f5 JO |
3497 | kvfree(uprobes); |
3498 | kfree(link); | |
b733eead JO |
3499 | if (task) |
3500 | put_task_struct(task); | |
89ae89f5 JO |
3501 | error_path_put: |
3502 | path_put(&path); | |
3503 | return err; | |
3504 | } | |
3505 | #else /* !CONFIG_UPROBES */ | |
3506 | int bpf_uprobe_multi_link_attach(const union bpf_attr *attr, struct bpf_prog *prog) | |
3507 | { | |
3508 | return -EOPNOTSUPP; | |
3509 | } | |
0b779b61 JO |
3510 | static u64 bpf_uprobe_multi_cookie(struct bpf_run_ctx *ctx) |
3511 | { | |
3512 | return 0; | |
3513 | } | |
686328d8 JO |
3514 | static u64 bpf_uprobe_multi_entry_ip(struct bpf_run_ctx *ctx) |
3515 | { | |
3516 | return 0; | |
3517 | } | |
89ae89f5 | 3518 | #endif /* CONFIG_UPROBES */ |
adf46d88 | 3519 | |
adf46d88 JO |
3520 | __bpf_kfunc_start_defs(); |
3521 | ||
3522 | __bpf_kfunc bool bpf_session_is_return(void) | |
3523 | { | |
3524 | struct bpf_session_run_ctx *session_ctx; | |
3525 | ||
3526 | session_ctx = container_of(current->bpf_ctx, struct bpf_session_run_ctx, run_ctx); | |
3527 | return session_ctx->is_return; | |
3528 | } | |
3529 | ||
5c919ace JO |
3530 | __bpf_kfunc __u64 *bpf_session_cookie(void) |
3531 | { | |
3532 | struct bpf_session_run_ctx *session_ctx; | |
3533 | ||
3534 | session_ctx = container_of(current->bpf_ctx, struct bpf_session_run_ctx, run_ctx); | |
3535 | return session_ctx->data; | |
3536 | } | |
3537 | ||
adf46d88 JO |
3538 | __bpf_kfunc_end_defs(); |
3539 | ||
3540 | BTF_KFUNCS_START(kprobe_multi_kfunc_set_ids) | |
3541 | BTF_ID_FLAGS(func, bpf_session_is_return) | |
5c919ace | 3542 | BTF_ID_FLAGS(func, bpf_session_cookie) |
adf46d88 JO |
3543 | BTF_KFUNCS_END(kprobe_multi_kfunc_set_ids) |
3544 | ||
3545 | static int bpf_kprobe_multi_filter(const struct bpf_prog *prog, u32 kfunc_id) | |
3546 | { | |
3547 | if (!btf_id_set8_contains(&kprobe_multi_kfunc_set_ids, kfunc_id)) | |
3548 | return 0; | |
3549 | ||
3550 | if (!is_kprobe_session(prog)) | |
3551 | return -EACCES; | |
3552 | ||
3553 | return 0; | |
3554 | } | |
3555 | ||
3556 | static const struct btf_kfunc_id_set bpf_kprobe_multi_kfunc_set = { | |
3557 | .owner = THIS_MODULE, | |
3558 | .set = &kprobe_multi_kfunc_set_ids, | |
3559 | .filter = bpf_kprobe_multi_filter, | |
3560 | }; | |
3561 | ||
3562 | static int __init bpf_kprobe_multi_kfuncs_init(void) | |
3563 | { | |
3564 | return register_btf_kfunc_id_set(BPF_PROG_TYPE_KPROBE, &bpf_kprobe_multi_kfunc_set); | |
3565 | } | |
3566 | ||
3567 | late_initcall(bpf_kprobe_multi_kfuncs_init); |