Commit | Line | Data |
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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> | |
0515e599 | 9 | #include <linux/bpf_perf_event.h> |
2541517c AS |
10 | #include <linux/filter.h> |
11 | #include <linux/uaccess.h> | |
9c959c86 | 12 | #include <linux/ctype.h> |
9802d865 | 13 | #include <linux/kprobes.h> |
41bdc4b4 | 14 | #include <linux/syscalls.h> |
540adea3 | 15 | #include <linux/error-injection.h> |
c9a0f3b8 | 16 | #include <linux/btf_ids.h> |
9802d865 | 17 | |
c7b6f29b NA |
18 | #include <asm/tlb.h> |
19 | ||
9802d865 | 20 | #include "trace_probe.h" |
2541517c AS |
21 | #include "trace.h" |
22 | ||
e672db03 SF |
23 | #define bpf_event_rcu_dereference(p) \ |
24 | rcu_dereference_protected(p, lockdep_is_held(&bpf_event_mutex)) | |
25 | ||
a38d1107 MM |
26 | #ifdef CONFIG_MODULES |
27 | struct bpf_trace_module { | |
28 | struct module *module; | |
29 | struct list_head list; | |
30 | }; | |
31 | ||
32 | static LIST_HEAD(bpf_trace_modules); | |
33 | static DEFINE_MUTEX(bpf_module_mutex); | |
34 | ||
35 | static struct bpf_raw_event_map *bpf_get_raw_tracepoint_module(const char *name) | |
36 | { | |
37 | struct bpf_raw_event_map *btp, *ret = NULL; | |
38 | struct bpf_trace_module *btm; | |
39 | unsigned int i; | |
40 | ||
41 | mutex_lock(&bpf_module_mutex); | |
42 | list_for_each_entry(btm, &bpf_trace_modules, list) { | |
43 | for (i = 0; i < btm->module->num_bpf_raw_events; ++i) { | |
44 | btp = &btm->module->bpf_raw_events[i]; | |
45 | if (!strcmp(btp->tp->name, name)) { | |
46 | if (try_module_get(btm->module)) | |
47 | ret = btp; | |
48 | goto out; | |
49 | } | |
50 | } | |
51 | } | |
52 | out: | |
53 | mutex_unlock(&bpf_module_mutex); | |
54 | return ret; | |
55 | } | |
56 | #else | |
57 | static struct bpf_raw_event_map *bpf_get_raw_tracepoint_module(const char *name) | |
58 | { | |
59 | return NULL; | |
60 | } | |
61 | #endif /* CONFIG_MODULES */ | |
62 | ||
035226b9 | 63 | u64 bpf_get_stackid(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5); |
c195651e | 64 | u64 bpf_get_stack(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5); |
035226b9 | 65 | |
2541517c AS |
66 | /** |
67 | * trace_call_bpf - invoke BPF program | |
e87c6bc3 | 68 | * @call: tracepoint event |
2541517c AS |
69 | * @ctx: opaque context pointer |
70 | * | |
71 | * kprobe handlers execute BPF programs via this helper. | |
72 | * Can be used from static tracepoints in the future. | |
73 | * | |
74 | * Return: BPF programs always return an integer which is interpreted by | |
75 | * kprobe handler as: | |
76 | * 0 - return from kprobe (event is filtered out) | |
77 | * 1 - store kprobe event into ring buffer | |
78 | * Other values are reserved and currently alias to 1 | |
79 | */ | |
e87c6bc3 | 80 | unsigned int trace_call_bpf(struct trace_event_call *call, void *ctx) |
2541517c AS |
81 | { |
82 | unsigned int ret; | |
83 | ||
84 | if (in_nmi()) /* not supported yet */ | |
85 | return 1; | |
86 | ||
b0a81b94 | 87 | cant_sleep(); |
2541517c AS |
88 | |
89 | if (unlikely(__this_cpu_inc_return(bpf_prog_active) != 1)) { | |
90 | /* | |
91 | * since some bpf program is already running on this cpu, | |
92 | * don't call into another bpf program (same or different) | |
93 | * and don't send kprobe event into ring-buffer, | |
94 | * so return zero here | |
95 | */ | |
96 | ret = 0; | |
97 | goto out; | |
98 | } | |
99 | ||
e87c6bc3 YS |
100 | /* |
101 | * Instead of moving rcu_read_lock/rcu_dereference/rcu_read_unlock | |
102 | * to all call sites, we did a bpf_prog_array_valid() there to check | |
103 | * whether call->prog_array is empty or not, which is | |
104 | * a heurisitc to speed up execution. | |
105 | * | |
106 | * If bpf_prog_array_valid() fetched prog_array was | |
107 | * non-NULL, we go into trace_call_bpf() and do the actual | |
108 | * proper rcu_dereference() under RCU lock. | |
109 | * If it turns out that prog_array is NULL then, we bail out. | |
110 | * For the opposite, if the bpf_prog_array_valid() fetched pointer | |
111 | * was NULL, you'll skip the prog_array with the risk of missing | |
112 | * out of events when it was updated in between this and the | |
113 | * rcu_dereference() which is accepted risk. | |
114 | */ | |
115 | ret = BPF_PROG_RUN_ARRAY_CHECK(call->prog_array, ctx, BPF_PROG_RUN); | |
2541517c AS |
116 | |
117 | out: | |
118 | __this_cpu_dec(bpf_prog_active); | |
2541517c AS |
119 | |
120 | return ret; | |
121 | } | |
2541517c | 122 | |
9802d865 JB |
123 | #ifdef CONFIG_BPF_KPROBE_OVERRIDE |
124 | BPF_CALL_2(bpf_override_return, struct pt_regs *, regs, unsigned long, rc) | |
125 | { | |
9802d865 | 126 | regs_set_return_value(regs, rc); |
540adea3 | 127 | override_function_with_return(regs); |
9802d865 JB |
128 | return 0; |
129 | } | |
130 | ||
131 | static const struct bpf_func_proto bpf_override_return_proto = { | |
132 | .func = bpf_override_return, | |
133 | .gpl_only = true, | |
134 | .ret_type = RET_INTEGER, | |
135 | .arg1_type = ARG_PTR_TO_CTX, | |
136 | .arg2_type = ARG_ANYTHING, | |
137 | }; | |
138 | #endif | |
139 | ||
8d92db5c CH |
140 | static __always_inline int |
141 | bpf_probe_read_user_common(void *dst, u32 size, const void __user *unsafe_ptr) | |
2541517c | 142 | { |
8d92db5c | 143 | int ret; |
2541517c | 144 | |
c0ee37e8 | 145 | ret = copy_from_user_nofault(dst, unsafe_ptr, size); |
6ae08ae3 DB |
146 | if (unlikely(ret < 0)) |
147 | memset(dst, 0, size); | |
6ae08ae3 DB |
148 | return ret; |
149 | } | |
150 | ||
8d92db5c CH |
151 | BPF_CALL_3(bpf_probe_read_user, void *, dst, u32, size, |
152 | const void __user *, unsafe_ptr) | |
153 | { | |
154 | return bpf_probe_read_user_common(dst, size, unsafe_ptr); | |
155 | } | |
156 | ||
f470378c | 157 | const struct bpf_func_proto bpf_probe_read_user_proto = { |
6ae08ae3 DB |
158 | .func = bpf_probe_read_user, |
159 | .gpl_only = true, | |
160 | .ret_type = RET_INTEGER, | |
161 | .arg1_type = ARG_PTR_TO_UNINIT_MEM, | |
162 | .arg2_type = ARG_CONST_SIZE_OR_ZERO, | |
163 | .arg3_type = ARG_ANYTHING, | |
164 | }; | |
165 | ||
8d92db5c CH |
166 | static __always_inline int |
167 | bpf_probe_read_user_str_common(void *dst, u32 size, | |
168 | const void __user *unsafe_ptr) | |
6ae08ae3 | 169 | { |
8d92db5c | 170 | int ret; |
6ae08ae3 | 171 | |
8d92db5c | 172 | ret = strncpy_from_user_nofault(dst, unsafe_ptr, size); |
6ae08ae3 DB |
173 | if (unlikely(ret < 0)) |
174 | memset(dst, 0, size); | |
6ae08ae3 DB |
175 | return ret; |
176 | } | |
177 | ||
8d92db5c CH |
178 | BPF_CALL_3(bpf_probe_read_user_str, void *, dst, u32, size, |
179 | const void __user *, unsafe_ptr) | |
180 | { | |
181 | return bpf_probe_read_user_str_common(dst, size, unsafe_ptr); | |
182 | } | |
183 | ||
f470378c | 184 | const struct bpf_func_proto bpf_probe_read_user_str_proto = { |
6ae08ae3 DB |
185 | .func = bpf_probe_read_user_str, |
186 | .gpl_only = true, | |
187 | .ret_type = RET_INTEGER, | |
188 | .arg1_type = ARG_PTR_TO_UNINIT_MEM, | |
189 | .arg2_type = ARG_CONST_SIZE_OR_ZERO, | |
190 | .arg3_type = ARG_ANYTHING, | |
191 | }; | |
192 | ||
193 | static __always_inline int | |
8d92db5c | 194 | bpf_probe_read_kernel_common(void *dst, u32 size, const void *unsafe_ptr) |
6ae08ae3 DB |
195 | { |
196 | int ret = security_locked_down(LOCKDOWN_BPF_READ); | |
9d1f8be5 | 197 | |
6ae08ae3 | 198 | if (unlikely(ret < 0)) |
8d92db5c | 199 | goto fail; |
fe557319 | 200 | ret = copy_from_kernel_nofault(dst, unsafe_ptr, size); |
074f528e | 201 | if (unlikely(ret < 0)) |
8d92db5c CH |
202 | goto fail; |
203 | return ret; | |
204 | fail: | |
205 | memset(dst, 0, size); | |
6ae08ae3 DB |
206 | return ret; |
207 | } | |
074f528e | 208 | |
6ae08ae3 DB |
209 | BPF_CALL_3(bpf_probe_read_kernel, void *, dst, u32, size, |
210 | const void *, unsafe_ptr) | |
211 | { | |
8d92db5c | 212 | return bpf_probe_read_kernel_common(dst, size, unsafe_ptr); |
6ae08ae3 DB |
213 | } |
214 | ||
f470378c | 215 | const struct bpf_func_proto bpf_probe_read_kernel_proto = { |
6ae08ae3 DB |
216 | .func = bpf_probe_read_kernel, |
217 | .gpl_only = true, | |
218 | .ret_type = RET_INTEGER, | |
219 | .arg1_type = ARG_PTR_TO_UNINIT_MEM, | |
220 | .arg2_type = ARG_CONST_SIZE_OR_ZERO, | |
221 | .arg3_type = ARG_ANYTHING, | |
222 | }; | |
223 | ||
6ae08ae3 | 224 | static __always_inline int |
8d92db5c | 225 | bpf_probe_read_kernel_str_common(void *dst, u32 size, const void *unsafe_ptr) |
6ae08ae3 DB |
226 | { |
227 | int ret = security_locked_down(LOCKDOWN_BPF_READ); | |
228 | ||
229 | if (unlikely(ret < 0)) | |
8d92db5c CH |
230 | goto fail; |
231 | ||
6ae08ae3 | 232 | /* |
8d92db5c CH |
233 | * The strncpy_from_kernel_nofault() call will likely not fill the |
234 | * entire buffer, but that's okay in this circumstance as we're probing | |
6ae08ae3 DB |
235 | * arbitrary memory anyway similar to bpf_probe_read_*() and might |
236 | * as well probe the stack. Thus, memory is explicitly cleared | |
237 | * only in error case, so that improper users ignoring return | |
238 | * code altogether don't copy garbage; otherwise length of string | |
239 | * is returned that can be used for bpf_perf_event_output() et al. | |
240 | */ | |
8d92db5c | 241 | ret = strncpy_from_kernel_nofault(dst, unsafe_ptr, size); |
6ae08ae3 | 242 | if (unlikely(ret < 0)) |
8d92db5c CH |
243 | goto fail; |
244 | ||
02553b91 | 245 | return ret; |
8d92db5c CH |
246 | fail: |
247 | memset(dst, 0, size); | |
074f528e | 248 | return ret; |
2541517c AS |
249 | } |
250 | ||
6ae08ae3 DB |
251 | BPF_CALL_3(bpf_probe_read_kernel_str, void *, dst, u32, size, |
252 | const void *, unsafe_ptr) | |
253 | { | |
8d92db5c | 254 | return bpf_probe_read_kernel_str_common(dst, size, unsafe_ptr); |
6ae08ae3 DB |
255 | } |
256 | ||
f470378c | 257 | const struct bpf_func_proto bpf_probe_read_kernel_str_proto = { |
6ae08ae3 DB |
258 | .func = bpf_probe_read_kernel_str, |
259 | .gpl_only = true, | |
260 | .ret_type = RET_INTEGER, | |
261 | .arg1_type = ARG_PTR_TO_UNINIT_MEM, | |
262 | .arg2_type = ARG_CONST_SIZE_OR_ZERO, | |
263 | .arg3_type = ARG_ANYTHING, | |
264 | }; | |
265 | ||
8d92db5c CH |
266 | #ifdef CONFIG_ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE |
267 | BPF_CALL_3(bpf_probe_read_compat, void *, dst, u32, size, | |
268 | const void *, unsafe_ptr) | |
269 | { | |
270 | if ((unsigned long)unsafe_ptr < TASK_SIZE) { | |
271 | return bpf_probe_read_user_common(dst, size, | |
272 | (__force void __user *)unsafe_ptr); | |
273 | } | |
274 | return bpf_probe_read_kernel_common(dst, size, unsafe_ptr); | |
275 | } | |
276 | ||
277 | static const struct bpf_func_proto bpf_probe_read_compat_proto = { | |
278 | .func = bpf_probe_read_compat, | |
279 | .gpl_only = true, | |
280 | .ret_type = RET_INTEGER, | |
281 | .arg1_type = ARG_PTR_TO_UNINIT_MEM, | |
282 | .arg2_type = ARG_CONST_SIZE_OR_ZERO, | |
283 | .arg3_type = ARG_ANYTHING, | |
284 | }; | |
285 | ||
6ae08ae3 DB |
286 | BPF_CALL_3(bpf_probe_read_compat_str, void *, dst, u32, size, |
287 | const void *, unsafe_ptr) | |
288 | { | |
8d92db5c CH |
289 | if ((unsigned long)unsafe_ptr < TASK_SIZE) { |
290 | return bpf_probe_read_user_str_common(dst, size, | |
291 | (__force void __user *)unsafe_ptr); | |
292 | } | |
293 | return bpf_probe_read_kernel_str_common(dst, size, unsafe_ptr); | |
6ae08ae3 DB |
294 | } |
295 | ||
296 | static const struct bpf_func_proto bpf_probe_read_compat_str_proto = { | |
297 | .func = bpf_probe_read_compat_str, | |
2541517c AS |
298 | .gpl_only = true, |
299 | .ret_type = RET_INTEGER, | |
39f19ebb | 300 | .arg1_type = ARG_PTR_TO_UNINIT_MEM, |
9c019e2b | 301 | .arg2_type = ARG_CONST_SIZE_OR_ZERO, |
2541517c AS |
302 | .arg3_type = ARG_ANYTHING, |
303 | }; | |
8d92db5c | 304 | #endif /* CONFIG_ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE */ |
2541517c | 305 | |
eb1b6688 | 306 | BPF_CALL_3(bpf_probe_write_user, void __user *, unsafe_ptr, const void *, src, |
f3694e00 | 307 | u32, size) |
96ae5227 | 308 | { |
96ae5227 SD |
309 | /* |
310 | * Ensure we're in user context which is safe for the helper to | |
311 | * run. This helper has no business in a kthread. | |
312 | * | |
313 | * access_ok() should prevent writing to non-user memory, but in | |
314 | * some situations (nommu, temporary switch, etc) access_ok() does | |
315 | * not provide enough validation, hence the check on KERNEL_DS. | |
c7b6f29b NA |
316 | * |
317 | * nmi_uaccess_okay() ensures the probe is not run in an interim | |
318 | * state, when the task or mm are switched. This is specifically | |
319 | * required to prevent the use of temporary mm. | |
96ae5227 SD |
320 | */ |
321 | ||
322 | if (unlikely(in_interrupt() || | |
323 | current->flags & (PF_KTHREAD | PF_EXITING))) | |
324 | return -EPERM; | |
db68ce10 | 325 | if (unlikely(uaccess_kernel())) |
96ae5227 | 326 | return -EPERM; |
c7b6f29b NA |
327 | if (unlikely(!nmi_uaccess_okay())) |
328 | return -EPERM; | |
96ae5227 | 329 | |
c0ee37e8 | 330 | return copy_to_user_nofault(unsafe_ptr, src, size); |
96ae5227 SD |
331 | } |
332 | ||
333 | static const struct bpf_func_proto bpf_probe_write_user_proto = { | |
334 | .func = bpf_probe_write_user, | |
335 | .gpl_only = true, | |
336 | .ret_type = RET_INTEGER, | |
337 | .arg1_type = ARG_ANYTHING, | |
39f19ebb AS |
338 | .arg2_type = ARG_PTR_TO_MEM, |
339 | .arg3_type = ARG_CONST_SIZE, | |
96ae5227 SD |
340 | }; |
341 | ||
342 | static const struct bpf_func_proto *bpf_get_probe_write_proto(void) | |
343 | { | |
2c78ee89 AS |
344 | if (!capable(CAP_SYS_ADMIN)) |
345 | return NULL; | |
346 | ||
96ae5227 SD |
347 | pr_warn_ratelimited("%s[%d] is installing a program with bpf_probe_write_user helper that may corrupt user memory!", |
348 | current->comm, task_pid_nr(current)); | |
349 | ||
350 | return &bpf_probe_write_user_proto; | |
351 | } | |
352 | ||
d7b2977b CH |
353 | static void bpf_trace_copy_string(char *buf, void *unsafe_ptr, char fmt_ptype, |
354 | size_t bufsz) | |
355 | { | |
356 | void __user *user_ptr = (__force void __user *)unsafe_ptr; | |
357 | ||
358 | buf[0] = 0; | |
359 | ||
360 | switch (fmt_ptype) { | |
361 | case 's': | |
362 | #ifdef CONFIG_ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE | |
aec6ce59 CH |
363 | if ((unsigned long)unsafe_ptr < TASK_SIZE) { |
364 | strncpy_from_user_nofault(buf, user_ptr, bufsz); | |
365 | break; | |
366 | } | |
367 | fallthrough; | |
d7b2977b CH |
368 | #endif |
369 | case 'k': | |
370 | strncpy_from_kernel_nofault(buf, unsafe_ptr, bufsz); | |
371 | break; | |
372 | case 'u': | |
373 | strncpy_from_user_nofault(buf, user_ptr, bufsz); | |
374 | break; | |
375 | } | |
376 | } | |
377 | ||
9c959c86 | 378 | /* |
7bda4b40 | 379 | * Only limited trace_printk() conversion specifiers allowed: |
2df6bb54 | 380 | * %d %i %u %x %ld %li %lu %lx %lld %lli %llu %llx %p %pB %pks %pus %s |
9c959c86 | 381 | */ |
f3694e00 DB |
382 | BPF_CALL_5(bpf_trace_printk, char *, fmt, u32, fmt_size, u64, arg1, |
383 | u64, arg2, u64, arg3) | |
9c959c86 | 384 | { |
b2a5212f DB |
385 | int i, mod[3] = {}, fmt_cnt = 0; |
386 | char buf[64], fmt_ptype; | |
387 | void *unsafe_ptr = NULL; | |
8d3b7dce | 388 | bool str_seen = false; |
9c959c86 AS |
389 | |
390 | /* | |
391 | * bpf_check()->check_func_arg()->check_stack_boundary() | |
392 | * guarantees that fmt points to bpf program stack, | |
393 | * fmt_size bytes of it were initialized and fmt_size > 0 | |
394 | */ | |
395 | if (fmt[--fmt_size] != 0) | |
396 | return -EINVAL; | |
397 | ||
398 | /* check format string for allowed specifiers */ | |
399 | for (i = 0; i < fmt_size; i++) { | |
400 | if ((!isprint(fmt[i]) && !isspace(fmt[i])) || !isascii(fmt[i])) | |
401 | return -EINVAL; | |
402 | ||
403 | if (fmt[i] != '%') | |
404 | continue; | |
405 | ||
406 | if (fmt_cnt >= 3) | |
407 | return -EINVAL; | |
408 | ||
409 | /* fmt[i] != 0 && fmt[last] == 0, so we can access fmt[i + 1] */ | |
410 | i++; | |
411 | if (fmt[i] == 'l') { | |
412 | mod[fmt_cnt]++; | |
413 | i++; | |
b2a5212f | 414 | } else if (fmt[i] == 'p') { |
9c959c86 | 415 | mod[fmt_cnt]++; |
b2a5212f DB |
416 | if ((fmt[i + 1] == 'k' || |
417 | fmt[i + 1] == 'u') && | |
418 | fmt[i + 2] == 's') { | |
419 | fmt_ptype = fmt[i + 1]; | |
420 | i += 2; | |
421 | goto fmt_str; | |
422 | } | |
423 | ||
2df6bb54 SL |
424 | if (fmt[i + 1] == 'B') { |
425 | i++; | |
426 | goto fmt_next; | |
427 | } | |
428 | ||
1efb6ee3 MP |
429 | /* disallow any further format extensions */ |
430 | if (fmt[i + 1] != 0 && | |
431 | !isspace(fmt[i + 1]) && | |
432 | !ispunct(fmt[i + 1])) | |
9c959c86 | 433 | return -EINVAL; |
b2a5212f DB |
434 | |
435 | goto fmt_next; | |
436 | } else if (fmt[i] == 's') { | |
437 | mod[fmt_cnt]++; | |
438 | fmt_ptype = fmt[i]; | |
439 | fmt_str: | |
440 | if (str_seen) | |
441 | /* allow only one '%s' per fmt string */ | |
442 | return -EINVAL; | |
443 | str_seen = true; | |
444 | ||
445 | if (fmt[i + 1] != 0 && | |
446 | !isspace(fmt[i + 1]) && | |
447 | !ispunct(fmt[i + 1])) | |
448 | return -EINVAL; | |
449 | ||
450 | switch (fmt_cnt) { | |
451 | case 0: | |
452 | unsafe_ptr = (void *)(long)arg1; | |
453 | arg1 = (long)buf; | |
454 | break; | |
455 | case 1: | |
456 | unsafe_ptr = (void *)(long)arg2; | |
457 | arg2 = (long)buf; | |
458 | break; | |
459 | case 2: | |
460 | unsafe_ptr = (void *)(long)arg3; | |
461 | arg3 = (long)buf; | |
462 | break; | |
463 | } | |
464 | ||
d7b2977b CH |
465 | bpf_trace_copy_string(buf, unsafe_ptr, fmt_ptype, |
466 | sizeof(buf)); | |
b2a5212f | 467 | goto fmt_next; |
9c959c86 AS |
468 | } |
469 | ||
470 | if (fmt[i] == 'l') { | |
471 | mod[fmt_cnt]++; | |
472 | i++; | |
473 | } | |
474 | ||
7bda4b40 JF |
475 | if (fmt[i] != 'i' && fmt[i] != 'd' && |
476 | fmt[i] != 'u' && fmt[i] != 'x') | |
9c959c86 | 477 | return -EINVAL; |
b2a5212f | 478 | fmt_next: |
9c959c86 AS |
479 | fmt_cnt++; |
480 | } | |
481 | ||
88a5c690 DB |
482 | /* Horrid workaround for getting va_list handling working with different |
483 | * argument type combinations generically for 32 and 64 bit archs. | |
484 | */ | |
485 | #define __BPF_TP_EMIT() __BPF_ARG3_TP() | |
486 | #define __BPF_TP(...) \ | |
eefa864a | 487 | __trace_printk(0 /* Fake ip */, \ |
88a5c690 DB |
488 | fmt, ##__VA_ARGS__) |
489 | ||
490 | #define __BPF_ARG1_TP(...) \ | |
491 | ((mod[0] == 2 || (mod[0] == 1 && __BITS_PER_LONG == 64)) \ | |
492 | ? __BPF_TP(arg1, ##__VA_ARGS__) \ | |
493 | : ((mod[0] == 1 || (mod[0] == 0 && __BITS_PER_LONG == 32)) \ | |
494 | ? __BPF_TP((long)arg1, ##__VA_ARGS__) \ | |
495 | : __BPF_TP((u32)arg1, ##__VA_ARGS__))) | |
496 | ||
497 | #define __BPF_ARG2_TP(...) \ | |
498 | ((mod[1] == 2 || (mod[1] == 1 && __BITS_PER_LONG == 64)) \ | |
499 | ? __BPF_ARG1_TP(arg2, ##__VA_ARGS__) \ | |
500 | : ((mod[1] == 1 || (mod[1] == 0 && __BITS_PER_LONG == 32)) \ | |
501 | ? __BPF_ARG1_TP((long)arg2, ##__VA_ARGS__) \ | |
502 | : __BPF_ARG1_TP((u32)arg2, ##__VA_ARGS__))) | |
503 | ||
504 | #define __BPF_ARG3_TP(...) \ | |
505 | ((mod[2] == 2 || (mod[2] == 1 && __BITS_PER_LONG == 64)) \ | |
506 | ? __BPF_ARG2_TP(arg3, ##__VA_ARGS__) \ | |
507 | : ((mod[2] == 1 || (mod[2] == 0 && __BITS_PER_LONG == 32)) \ | |
508 | ? __BPF_ARG2_TP((long)arg3, ##__VA_ARGS__) \ | |
509 | : __BPF_ARG2_TP((u32)arg3, ##__VA_ARGS__))) | |
510 | ||
511 | return __BPF_TP_EMIT(); | |
9c959c86 AS |
512 | } |
513 | ||
514 | static const struct bpf_func_proto bpf_trace_printk_proto = { | |
515 | .func = bpf_trace_printk, | |
516 | .gpl_only = true, | |
517 | .ret_type = RET_INTEGER, | |
39f19ebb AS |
518 | .arg1_type = ARG_PTR_TO_MEM, |
519 | .arg2_type = ARG_CONST_SIZE, | |
9c959c86 AS |
520 | }; |
521 | ||
0756ea3e AS |
522 | const struct bpf_func_proto *bpf_get_trace_printk_proto(void) |
523 | { | |
524 | /* | |
525 | * this program might be calling bpf_trace_printk, | |
526 | * so allocate per-cpu printk buffers | |
527 | */ | |
528 | trace_printk_init_buffers(); | |
529 | ||
530 | return &bpf_trace_printk_proto; | |
531 | } | |
532 | ||
492e639f YS |
533 | #define MAX_SEQ_PRINTF_VARARGS 12 |
534 | #define MAX_SEQ_PRINTF_MAX_MEMCPY 6 | |
535 | #define MAX_SEQ_PRINTF_STR_LEN 128 | |
536 | ||
537 | struct bpf_seq_printf_buf { | |
538 | char buf[MAX_SEQ_PRINTF_MAX_MEMCPY][MAX_SEQ_PRINTF_STR_LEN]; | |
539 | }; | |
540 | static DEFINE_PER_CPU(struct bpf_seq_printf_buf, bpf_seq_printf_buf); | |
541 | static DEFINE_PER_CPU(int, bpf_seq_printf_buf_used); | |
542 | ||
543 | BPF_CALL_5(bpf_seq_printf, struct seq_file *, m, char *, fmt, u32, fmt_size, | |
544 | const void *, data, u32, data_len) | |
545 | { | |
546 | int err = -EINVAL, fmt_cnt = 0, memcpy_cnt = 0; | |
547 | int i, buf_used, copy_size, num_args; | |
548 | u64 params[MAX_SEQ_PRINTF_VARARGS]; | |
549 | struct bpf_seq_printf_buf *bufs; | |
550 | const u64 *args = data; | |
551 | ||
552 | buf_used = this_cpu_inc_return(bpf_seq_printf_buf_used); | |
553 | if (WARN_ON_ONCE(buf_used > 1)) { | |
554 | err = -EBUSY; | |
555 | goto out; | |
556 | } | |
557 | ||
558 | bufs = this_cpu_ptr(&bpf_seq_printf_buf); | |
559 | ||
560 | /* | |
561 | * bpf_check()->check_func_arg()->check_stack_boundary() | |
562 | * guarantees that fmt points to bpf program stack, | |
563 | * fmt_size bytes of it were initialized and fmt_size > 0 | |
564 | */ | |
565 | if (fmt[--fmt_size] != 0) | |
566 | goto out; | |
567 | ||
568 | if (data_len & 7) | |
569 | goto out; | |
570 | ||
571 | for (i = 0; i < fmt_size; i++) { | |
572 | if (fmt[i] == '%') { | |
573 | if (fmt[i + 1] == '%') | |
574 | i++; | |
575 | else if (!data || !data_len) | |
576 | goto out; | |
577 | } | |
578 | } | |
579 | ||
580 | num_args = data_len / 8; | |
581 | ||
582 | /* check format string for allowed specifiers */ | |
583 | for (i = 0; i < fmt_size; i++) { | |
584 | /* only printable ascii for now. */ | |
585 | if ((!isprint(fmt[i]) && !isspace(fmt[i])) || !isascii(fmt[i])) { | |
586 | err = -EINVAL; | |
587 | goto out; | |
588 | } | |
589 | ||
590 | if (fmt[i] != '%') | |
591 | continue; | |
592 | ||
593 | if (fmt[i + 1] == '%') { | |
594 | i++; | |
595 | continue; | |
596 | } | |
597 | ||
598 | if (fmt_cnt >= MAX_SEQ_PRINTF_VARARGS) { | |
599 | err = -E2BIG; | |
600 | goto out; | |
601 | } | |
602 | ||
603 | if (fmt_cnt >= num_args) { | |
604 | err = -EINVAL; | |
605 | goto out; | |
606 | } | |
607 | ||
608 | /* fmt[i] != 0 && fmt[last] == 0, so we can access fmt[i + 1] */ | |
609 | i++; | |
610 | ||
611 | /* skip optional "[0 +-][num]" width formating field */ | |
612 | while (fmt[i] == '0' || fmt[i] == '+' || fmt[i] == '-' || | |
613 | fmt[i] == ' ') | |
614 | i++; | |
615 | if (fmt[i] >= '1' && fmt[i] <= '9') { | |
616 | i++; | |
617 | while (fmt[i] >= '0' && fmt[i] <= '9') | |
618 | i++; | |
619 | } | |
620 | ||
621 | if (fmt[i] == 's') { | |
19c8d8ac AM |
622 | void *unsafe_ptr; |
623 | ||
492e639f YS |
624 | /* try our best to copy */ |
625 | if (memcpy_cnt >= MAX_SEQ_PRINTF_MAX_MEMCPY) { | |
626 | err = -E2BIG; | |
627 | goto out; | |
628 | } | |
629 | ||
19c8d8ac AM |
630 | unsafe_ptr = (void *)(long)args[fmt_cnt]; |
631 | err = strncpy_from_kernel_nofault(bufs->buf[memcpy_cnt], | |
632 | unsafe_ptr, MAX_SEQ_PRINTF_STR_LEN); | |
492e639f YS |
633 | if (err < 0) |
634 | bufs->buf[memcpy_cnt][0] = '\0'; | |
635 | params[fmt_cnt] = (u64)(long)bufs->buf[memcpy_cnt]; | |
636 | ||
637 | fmt_cnt++; | |
638 | memcpy_cnt++; | |
639 | continue; | |
640 | } | |
641 | ||
642 | if (fmt[i] == 'p') { | |
643 | if (fmt[i + 1] == 0 || | |
644 | fmt[i + 1] == 'K' || | |
2df6bb54 SL |
645 | fmt[i + 1] == 'x' || |
646 | fmt[i + 1] == 'B') { | |
492e639f YS |
647 | /* just kernel pointers */ |
648 | params[fmt_cnt] = args[fmt_cnt]; | |
649 | fmt_cnt++; | |
650 | continue; | |
651 | } | |
652 | ||
653 | /* only support "%pI4", "%pi4", "%pI6" and "%pi6". */ | |
654 | if (fmt[i + 1] != 'i' && fmt[i + 1] != 'I') { | |
655 | err = -EINVAL; | |
656 | goto out; | |
657 | } | |
658 | if (fmt[i + 2] != '4' && fmt[i + 2] != '6') { | |
659 | err = -EINVAL; | |
660 | goto out; | |
661 | } | |
662 | ||
663 | if (memcpy_cnt >= MAX_SEQ_PRINTF_MAX_MEMCPY) { | |
664 | err = -E2BIG; | |
665 | goto out; | |
666 | } | |
667 | ||
668 | ||
669 | copy_size = (fmt[i + 2] == '4') ? 4 : 16; | |
670 | ||
fe557319 | 671 | err = copy_from_kernel_nofault(bufs->buf[memcpy_cnt], |
492e639f YS |
672 | (void *) (long) args[fmt_cnt], |
673 | copy_size); | |
674 | if (err < 0) | |
675 | memset(bufs->buf[memcpy_cnt], 0, copy_size); | |
676 | params[fmt_cnt] = (u64)(long)bufs->buf[memcpy_cnt]; | |
677 | ||
678 | i += 2; | |
679 | fmt_cnt++; | |
680 | memcpy_cnt++; | |
681 | continue; | |
682 | } | |
683 | ||
684 | if (fmt[i] == 'l') { | |
685 | i++; | |
686 | if (fmt[i] == 'l') | |
687 | i++; | |
688 | } | |
689 | ||
690 | if (fmt[i] != 'i' && fmt[i] != 'd' && | |
c06b0229 YS |
691 | fmt[i] != 'u' && fmt[i] != 'x' && |
692 | fmt[i] != 'X') { | |
492e639f YS |
693 | err = -EINVAL; |
694 | goto out; | |
695 | } | |
696 | ||
697 | params[fmt_cnt] = args[fmt_cnt]; | |
698 | fmt_cnt++; | |
699 | } | |
700 | ||
701 | /* Maximumly we can have MAX_SEQ_PRINTF_VARARGS parameter, just give | |
702 | * all of them to seq_printf(). | |
703 | */ | |
704 | seq_printf(m, fmt, params[0], params[1], params[2], params[3], | |
705 | params[4], params[5], params[6], params[7], params[8], | |
706 | params[9], params[10], params[11]); | |
707 | ||
708 | err = seq_has_overflowed(m) ? -EOVERFLOW : 0; | |
709 | out: | |
710 | this_cpu_dec(bpf_seq_printf_buf_used); | |
711 | return err; | |
712 | } | |
713 | ||
c9a0f3b8 JO |
714 | BTF_ID_LIST(bpf_seq_printf_btf_ids) |
715 | BTF_ID(struct, seq_file) | |
716 | ||
492e639f YS |
717 | static const struct bpf_func_proto bpf_seq_printf_proto = { |
718 | .func = bpf_seq_printf, | |
719 | .gpl_only = true, | |
720 | .ret_type = RET_INTEGER, | |
721 | .arg1_type = ARG_PTR_TO_BTF_ID, | |
722 | .arg2_type = ARG_PTR_TO_MEM, | |
723 | .arg3_type = ARG_CONST_SIZE, | |
724 | .arg4_type = ARG_PTR_TO_MEM_OR_NULL, | |
725 | .arg5_type = ARG_CONST_SIZE_OR_ZERO, | |
726 | .btf_id = bpf_seq_printf_btf_ids, | |
727 | }; | |
728 | ||
729 | BPF_CALL_3(bpf_seq_write, struct seq_file *, m, const void *, data, u32, len) | |
730 | { | |
731 | return seq_write(m, data, len) ? -EOVERFLOW : 0; | |
732 | } | |
733 | ||
c9a0f3b8 JO |
734 | BTF_ID_LIST(bpf_seq_write_btf_ids) |
735 | BTF_ID(struct, seq_file) | |
736 | ||
492e639f YS |
737 | static const struct bpf_func_proto bpf_seq_write_proto = { |
738 | .func = bpf_seq_write, | |
739 | .gpl_only = true, | |
740 | .ret_type = RET_INTEGER, | |
741 | .arg1_type = ARG_PTR_TO_BTF_ID, | |
742 | .arg2_type = ARG_PTR_TO_MEM, | |
743 | .arg3_type = ARG_CONST_SIZE_OR_ZERO, | |
744 | .btf_id = bpf_seq_write_btf_ids, | |
745 | }; | |
746 | ||
908432ca YS |
747 | static __always_inline int |
748 | get_map_perf_counter(struct bpf_map *map, u64 flags, | |
749 | u64 *value, u64 *enabled, u64 *running) | |
35578d79 | 750 | { |
35578d79 | 751 | struct bpf_array *array = container_of(map, struct bpf_array, map); |
6816a7ff DB |
752 | unsigned int cpu = smp_processor_id(); |
753 | u64 index = flags & BPF_F_INDEX_MASK; | |
3b1efb19 | 754 | struct bpf_event_entry *ee; |
35578d79 | 755 | |
6816a7ff DB |
756 | if (unlikely(flags & ~(BPF_F_INDEX_MASK))) |
757 | return -EINVAL; | |
758 | if (index == BPF_F_CURRENT_CPU) | |
759 | index = cpu; | |
35578d79 KX |
760 | if (unlikely(index >= array->map.max_entries)) |
761 | return -E2BIG; | |
762 | ||
3b1efb19 | 763 | ee = READ_ONCE(array->ptrs[index]); |
1ca1cc98 | 764 | if (!ee) |
35578d79 KX |
765 | return -ENOENT; |
766 | ||
908432ca YS |
767 | return perf_event_read_local(ee->event, value, enabled, running); |
768 | } | |
769 | ||
770 | BPF_CALL_2(bpf_perf_event_read, struct bpf_map *, map, u64, flags) | |
771 | { | |
772 | u64 value = 0; | |
773 | int err; | |
774 | ||
775 | err = get_map_perf_counter(map, flags, &value, NULL, NULL); | |
35578d79 | 776 | /* |
f91840a3 AS |
777 | * this api is ugly since we miss [-22..-2] range of valid |
778 | * counter values, but that's uapi | |
35578d79 | 779 | */ |
f91840a3 AS |
780 | if (err) |
781 | return err; | |
782 | return value; | |
35578d79 KX |
783 | } |
784 | ||
62544ce8 | 785 | static const struct bpf_func_proto bpf_perf_event_read_proto = { |
35578d79 | 786 | .func = bpf_perf_event_read, |
1075ef59 | 787 | .gpl_only = true, |
35578d79 KX |
788 | .ret_type = RET_INTEGER, |
789 | .arg1_type = ARG_CONST_MAP_PTR, | |
790 | .arg2_type = ARG_ANYTHING, | |
791 | }; | |
792 | ||
908432ca YS |
793 | BPF_CALL_4(bpf_perf_event_read_value, struct bpf_map *, map, u64, flags, |
794 | struct bpf_perf_event_value *, buf, u32, size) | |
795 | { | |
796 | int err = -EINVAL; | |
797 | ||
798 | if (unlikely(size != sizeof(struct bpf_perf_event_value))) | |
799 | goto clear; | |
800 | err = get_map_perf_counter(map, flags, &buf->counter, &buf->enabled, | |
801 | &buf->running); | |
802 | if (unlikely(err)) | |
803 | goto clear; | |
804 | return 0; | |
805 | clear: | |
806 | memset(buf, 0, size); | |
807 | return err; | |
808 | } | |
809 | ||
810 | static const struct bpf_func_proto bpf_perf_event_read_value_proto = { | |
811 | .func = bpf_perf_event_read_value, | |
812 | .gpl_only = true, | |
813 | .ret_type = RET_INTEGER, | |
814 | .arg1_type = ARG_CONST_MAP_PTR, | |
815 | .arg2_type = ARG_ANYTHING, | |
816 | .arg3_type = ARG_PTR_TO_UNINIT_MEM, | |
817 | .arg4_type = ARG_CONST_SIZE, | |
818 | }; | |
819 | ||
8e7a3920 DB |
820 | static __always_inline u64 |
821 | __bpf_perf_event_output(struct pt_regs *regs, struct bpf_map *map, | |
283ca526 | 822 | u64 flags, struct perf_sample_data *sd) |
a43eec30 | 823 | { |
a43eec30 | 824 | struct bpf_array *array = container_of(map, struct bpf_array, map); |
d7931330 | 825 | unsigned int cpu = smp_processor_id(); |
1e33759c | 826 | u64 index = flags & BPF_F_INDEX_MASK; |
3b1efb19 | 827 | struct bpf_event_entry *ee; |
a43eec30 | 828 | struct perf_event *event; |
a43eec30 | 829 | |
1e33759c | 830 | if (index == BPF_F_CURRENT_CPU) |
d7931330 | 831 | index = cpu; |
a43eec30 AS |
832 | if (unlikely(index >= array->map.max_entries)) |
833 | return -E2BIG; | |
834 | ||
3b1efb19 | 835 | ee = READ_ONCE(array->ptrs[index]); |
1ca1cc98 | 836 | if (!ee) |
a43eec30 AS |
837 | return -ENOENT; |
838 | ||
3b1efb19 | 839 | event = ee->event; |
a43eec30 AS |
840 | if (unlikely(event->attr.type != PERF_TYPE_SOFTWARE || |
841 | event->attr.config != PERF_COUNT_SW_BPF_OUTPUT)) | |
842 | return -EINVAL; | |
843 | ||
d7931330 | 844 | if (unlikely(event->oncpu != cpu)) |
a43eec30 AS |
845 | return -EOPNOTSUPP; |
846 | ||
56201969 | 847 | return perf_event_output(event, sd, regs); |
a43eec30 AS |
848 | } |
849 | ||
9594dc3c MM |
850 | /* |
851 | * Support executing tracepoints in normal, irq, and nmi context that each call | |
852 | * bpf_perf_event_output | |
853 | */ | |
854 | struct bpf_trace_sample_data { | |
855 | struct perf_sample_data sds[3]; | |
856 | }; | |
857 | ||
858 | static DEFINE_PER_CPU(struct bpf_trace_sample_data, bpf_trace_sds); | |
859 | static DEFINE_PER_CPU(int, bpf_trace_nest_level); | |
f3694e00 DB |
860 | BPF_CALL_5(bpf_perf_event_output, struct pt_regs *, regs, struct bpf_map *, map, |
861 | u64, flags, void *, data, u64, size) | |
8e7a3920 | 862 | { |
9594dc3c MM |
863 | struct bpf_trace_sample_data *sds = this_cpu_ptr(&bpf_trace_sds); |
864 | int nest_level = this_cpu_inc_return(bpf_trace_nest_level); | |
8e7a3920 DB |
865 | struct perf_raw_record raw = { |
866 | .frag = { | |
867 | .size = size, | |
868 | .data = data, | |
869 | }, | |
870 | }; | |
9594dc3c MM |
871 | struct perf_sample_data *sd; |
872 | int err; | |
8e7a3920 | 873 | |
9594dc3c MM |
874 | if (WARN_ON_ONCE(nest_level > ARRAY_SIZE(sds->sds))) { |
875 | err = -EBUSY; | |
876 | goto out; | |
877 | } | |
878 | ||
879 | sd = &sds->sds[nest_level - 1]; | |
880 | ||
881 | if (unlikely(flags & ~(BPF_F_INDEX_MASK))) { | |
882 | err = -EINVAL; | |
883 | goto out; | |
884 | } | |
8e7a3920 | 885 | |
283ca526 DB |
886 | perf_sample_data_init(sd, 0, 0); |
887 | sd->raw = &raw; | |
888 | ||
9594dc3c MM |
889 | err = __bpf_perf_event_output(regs, map, flags, sd); |
890 | ||
891 | out: | |
892 | this_cpu_dec(bpf_trace_nest_level); | |
893 | return err; | |
8e7a3920 DB |
894 | } |
895 | ||
a43eec30 AS |
896 | static const struct bpf_func_proto bpf_perf_event_output_proto = { |
897 | .func = bpf_perf_event_output, | |
1075ef59 | 898 | .gpl_only = true, |
a43eec30 AS |
899 | .ret_type = RET_INTEGER, |
900 | .arg1_type = ARG_PTR_TO_CTX, | |
901 | .arg2_type = ARG_CONST_MAP_PTR, | |
902 | .arg3_type = ARG_ANYTHING, | |
39f19ebb | 903 | .arg4_type = ARG_PTR_TO_MEM, |
a60dd35d | 904 | .arg5_type = ARG_CONST_SIZE_OR_ZERO, |
a43eec30 AS |
905 | }; |
906 | ||
768fb61f AZ |
907 | static DEFINE_PER_CPU(int, bpf_event_output_nest_level); |
908 | struct bpf_nested_pt_regs { | |
909 | struct pt_regs regs[3]; | |
910 | }; | |
911 | static DEFINE_PER_CPU(struct bpf_nested_pt_regs, bpf_pt_regs); | |
912 | static DEFINE_PER_CPU(struct bpf_trace_sample_data, bpf_misc_sds); | |
bd570ff9 | 913 | |
555c8a86 DB |
914 | u64 bpf_event_output(struct bpf_map *map, u64 flags, void *meta, u64 meta_size, |
915 | void *ctx, u64 ctx_size, bpf_ctx_copy_t ctx_copy) | |
bd570ff9 | 916 | { |
768fb61f | 917 | int nest_level = this_cpu_inc_return(bpf_event_output_nest_level); |
555c8a86 DB |
918 | struct perf_raw_frag frag = { |
919 | .copy = ctx_copy, | |
920 | .size = ctx_size, | |
921 | .data = ctx, | |
922 | }; | |
923 | struct perf_raw_record raw = { | |
924 | .frag = { | |
183fc153 AM |
925 | { |
926 | .next = ctx_size ? &frag : NULL, | |
927 | }, | |
555c8a86 DB |
928 | .size = meta_size, |
929 | .data = meta, | |
930 | }, | |
931 | }; | |
768fb61f AZ |
932 | struct perf_sample_data *sd; |
933 | struct pt_regs *regs; | |
934 | u64 ret; | |
935 | ||
936 | if (WARN_ON_ONCE(nest_level > ARRAY_SIZE(bpf_misc_sds.sds))) { | |
937 | ret = -EBUSY; | |
938 | goto out; | |
939 | } | |
940 | sd = this_cpu_ptr(&bpf_misc_sds.sds[nest_level - 1]); | |
941 | regs = this_cpu_ptr(&bpf_pt_regs.regs[nest_level - 1]); | |
bd570ff9 DB |
942 | |
943 | perf_fetch_caller_regs(regs); | |
283ca526 DB |
944 | perf_sample_data_init(sd, 0, 0); |
945 | sd->raw = &raw; | |
bd570ff9 | 946 | |
768fb61f AZ |
947 | ret = __bpf_perf_event_output(regs, map, flags, sd); |
948 | out: | |
949 | this_cpu_dec(bpf_event_output_nest_level); | |
950 | return ret; | |
bd570ff9 DB |
951 | } |
952 | ||
f3694e00 | 953 | BPF_CALL_0(bpf_get_current_task) |
606274c5 AS |
954 | { |
955 | return (long) current; | |
956 | } | |
957 | ||
f470378c | 958 | const struct bpf_func_proto bpf_get_current_task_proto = { |
606274c5 AS |
959 | .func = bpf_get_current_task, |
960 | .gpl_only = true, | |
961 | .ret_type = RET_INTEGER, | |
962 | }; | |
963 | ||
f3694e00 | 964 | BPF_CALL_2(bpf_current_task_under_cgroup, struct bpf_map *, map, u32, idx) |
60d20f91 | 965 | { |
60d20f91 SD |
966 | struct bpf_array *array = container_of(map, struct bpf_array, map); |
967 | struct cgroup *cgrp; | |
60d20f91 | 968 | |
60d20f91 SD |
969 | if (unlikely(idx >= array->map.max_entries)) |
970 | return -E2BIG; | |
971 | ||
972 | cgrp = READ_ONCE(array->ptrs[idx]); | |
973 | if (unlikely(!cgrp)) | |
974 | return -EAGAIN; | |
975 | ||
976 | return task_under_cgroup_hierarchy(current, cgrp); | |
977 | } | |
978 | ||
979 | static const struct bpf_func_proto bpf_current_task_under_cgroup_proto = { | |
980 | .func = bpf_current_task_under_cgroup, | |
981 | .gpl_only = false, | |
982 | .ret_type = RET_INTEGER, | |
983 | .arg1_type = ARG_CONST_MAP_PTR, | |
984 | .arg2_type = ARG_ANYTHING, | |
985 | }; | |
986 | ||
8b401f9e YS |
987 | struct send_signal_irq_work { |
988 | struct irq_work irq_work; | |
989 | struct task_struct *task; | |
990 | u32 sig; | |
8482941f | 991 | enum pid_type type; |
8b401f9e YS |
992 | }; |
993 | ||
994 | static DEFINE_PER_CPU(struct send_signal_irq_work, send_signal_work); | |
995 | ||
996 | static void do_bpf_send_signal(struct irq_work *entry) | |
997 | { | |
998 | struct send_signal_irq_work *work; | |
999 | ||
1000 | work = container_of(entry, struct send_signal_irq_work, irq_work); | |
8482941f | 1001 | group_send_sig_info(work->sig, SEND_SIG_PRIV, work->task, work->type); |
8b401f9e YS |
1002 | } |
1003 | ||
8482941f | 1004 | static int bpf_send_signal_common(u32 sig, enum pid_type type) |
8b401f9e YS |
1005 | { |
1006 | struct send_signal_irq_work *work = NULL; | |
1007 | ||
1008 | /* Similar to bpf_probe_write_user, task needs to be | |
1009 | * in a sound condition and kernel memory access be | |
1010 | * permitted in order to send signal to the current | |
1011 | * task. | |
1012 | */ | |
1013 | if (unlikely(current->flags & (PF_KTHREAD | PF_EXITING))) | |
1014 | return -EPERM; | |
1015 | if (unlikely(uaccess_kernel())) | |
1016 | return -EPERM; | |
1017 | if (unlikely(!nmi_uaccess_okay())) | |
1018 | return -EPERM; | |
1019 | ||
1bc7896e | 1020 | if (irqs_disabled()) { |
e1afb702 YS |
1021 | /* Do an early check on signal validity. Otherwise, |
1022 | * the error is lost in deferred irq_work. | |
1023 | */ | |
1024 | if (unlikely(!valid_signal(sig))) | |
1025 | return -EINVAL; | |
1026 | ||
8b401f9e | 1027 | work = this_cpu_ptr(&send_signal_work); |
153bedba | 1028 | if (atomic_read(&work->irq_work.flags) & IRQ_WORK_BUSY) |
8b401f9e YS |
1029 | return -EBUSY; |
1030 | ||
1031 | /* Add the current task, which is the target of sending signal, | |
1032 | * to the irq_work. The current task may change when queued | |
1033 | * irq works get executed. | |
1034 | */ | |
1035 | work->task = current; | |
1036 | work->sig = sig; | |
8482941f | 1037 | work->type = type; |
8b401f9e YS |
1038 | irq_work_queue(&work->irq_work); |
1039 | return 0; | |
1040 | } | |
1041 | ||
8482941f YS |
1042 | return group_send_sig_info(sig, SEND_SIG_PRIV, current, type); |
1043 | } | |
1044 | ||
1045 | BPF_CALL_1(bpf_send_signal, u32, sig) | |
1046 | { | |
1047 | return bpf_send_signal_common(sig, PIDTYPE_TGID); | |
8b401f9e YS |
1048 | } |
1049 | ||
1050 | static const struct bpf_func_proto bpf_send_signal_proto = { | |
1051 | .func = bpf_send_signal, | |
1052 | .gpl_only = false, | |
1053 | .ret_type = RET_INTEGER, | |
1054 | .arg1_type = ARG_ANYTHING, | |
1055 | }; | |
1056 | ||
8482941f YS |
1057 | BPF_CALL_1(bpf_send_signal_thread, u32, sig) |
1058 | { | |
1059 | return bpf_send_signal_common(sig, PIDTYPE_PID); | |
1060 | } | |
1061 | ||
1062 | static const struct bpf_func_proto bpf_send_signal_thread_proto = { | |
1063 | .func = bpf_send_signal_thread, | |
1064 | .gpl_only = false, | |
1065 | .ret_type = RET_INTEGER, | |
1066 | .arg1_type = ARG_ANYTHING, | |
1067 | }; | |
1068 | ||
fc611f47 KS |
1069 | const struct bpf_func_proto * |
1070 | bpf_tracing_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) | |
2541517c AS |
1071 | { |
1072 | switch (func_id) { | |
1073 | case BPF_FUNC_map_lookup_elem: | |
1074 | return &bpf_map_lookup_elem_proto; | |
1075 | case BPF_FUNC_map_update_elem: | |
1076 | return &bpf_map_update_elem_proto; | |
1077 | case BPF_FUNC_map_delete_elem: | |
1078 | return &bpf_map_delete_elem_proto; | |
02a8c817 AC |
1079 | case BPF_FUNC_map_push_elem: |
1080 | return &bpf_map_push_elem_proto; | |
1081 | case BPF_FUNC_map_pop_elem: | |
1082 | return &bpf_map_pop_elem_proto; | |
1083 | case BPF_FUNC_map_peek_elem: | |
1084 | return &bpf_map_peek_elem_proto; | |
d9847d31 AS |
1085 | case BPF_FUNC_ktime_get_ns: |
1086 | return &bpf_ktime_get_ns_proto; | |
71d19214 MÅ» |
1087 | case BPF_FUNC_ktime_get_boot_ns: |
1088 | return &bpf_ktime_get_boot_ns_proto; | |
04fd61ab AS |
1089 | case BPF_FUNC_tail_call: |
1090 | return &bpf_tail_call_proto; | |
ffeedafb AS |
1091 | case BPF_FUNC_get_current_pid_tgid: |
1092 | return &bpf_get_current_pid_tgid_proto; | |
606274c5 AS |
1093 | case BPF_FUNC_get_current_task: |
1094 | return &bpf_get_current_task_proto; | |
ffeedafb AS |
1095 | case BPF_FUNC_get_current_uid_gid: |
1096 | return &bpf_get_current_uid_gid_proto; | |
1097 | case BPF_FUNC_get_current_comm: | |
1098 | return &bpf_get_current_comm_proto; | |
9c959c86 | 1099 | case BPF_FUNC_trace_printk: |
0756ea3e | 1100 | return bpf_get_trace_printk_proto(); |
ab1973d3 AS |
1101 | case BPF_FUNC_get_smp_processor_id: |
1102 | return &bpf_get_smp_processor_id_proto; | |
2d0e30c3 DB |
1103 | case BPF_FUNC_get_numa_node_id: |
1104 | return &bpf_get_numa_node_id_proto; | |
35578d79 KX |
1105 | case BPF_FUNC_perf_event_read: |
1106 | return &bpf_perf_event_read_proto; | |
96ae5227 SD |
1107 | case BPF_FUNC_probe_write_user: |
1108 | return bpf_get_probe_write_proto(); | |
60d20f91 SD |
1109 | case BPF_FUNC_current_task_under_cgroup: |
1110 | return &bpf_current_task_under_cgroup_proto; | |
8937bd80 AS |
1111 | case BPF_FUNC_get_prandom_u32: |
1112 | return &bpf_get_prandom_u32_proto; | |
6ae08ae3 DB |
1113 | case BPF_FUNC_probe_read_user: |
1114 | return &bpf_probe_read_user_proto; | |
1115 | case BPF_FUNC_probe_read_kernel: | |
1116 | return &bpf_probe_read_kernel_proto; | |
6ae08ae3 DB |
1117 | case BPF_FUNC_probe_read_user_str: |
1118 | return &bpf_probe_read_user_str_proto; | |
1119 | case BPF_FUNC_probe_read_kernel_str: | |
1120 | return &bpf_probe_read_kernel_str_proto; | |
0ebeea8c DB |
1121 | #ifdef CONFIG_ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE |
1122 | case BPF_FUNC_probe_read: | |
1123 | return &bpf_probe_read_compat_proto; | |
a5e8c070 | 1124 | case BPF_FUNC_probe_read_str: |
6ae08ae3 | 1125 | return &bpf_probe_read_compat_str_proto; |
0ebeea8c | 1126 | #endif |
34ea38ca | 1127 | #ifdef CONFIG_CGROUPS |
bf6fa2c8 YS |
1128 | case BPF_FUNC_get_current_cgroup_id: |
1129 | return &bpf_get_current_cgroup_id_proto; | |
34ea38ca | 1130 | #endif |
8b401f9e YS |
1131 | case BPF_FUNC_send_signal: |
1132 | return &bpf_send_signal_proto; | |
8482941f YS |
1133 | case BPF_FUNC_send_signal_thread: |
1134 | return &bpf_send_signal_thread_proto; | |
b80b033b SL |
1135 | case BPF_FUNC_perf_event_read_value: |
1136 | return &bpf_perf_event_read_value_proto; | |
b4490c5c CN |
1137 | case BPF_FUNC_get_ns_current_pid_tgid: |
1138 | return &bpf_get_ns_current_pid_tgid_proto; | |
457f4436 AN |
1139 | case BPF_FUNC_ringbuf_output: |
1140 | return &bpf_ringbuf_output_proto; | |
1141 | case BPF_FUNC_ringbuf_reserve: | |
1142 | return &bpf_ringbuf_reserve_proto; | |
1143 | case BPF_FUNC_ringbuf_submit: | |
1144 | return &bpf_ringbuf_submit_proto; | |
1145 | case BPF_FUNC_ringbuf_discard: | |
1146 | return &bpf_ringbuf_discard_proto; | |
1147 | case BPF_FUNC_ringbuf_query: | |
1148 | return &bpf_ringbuf_query_proto; | |
72e2b2b6 YS |
1149 | case BPF_FUNC_jiffies64: |
1150 | return &bpf_jiffies64_proto; | |
fa28dcb8 SL |
1151 | case BPF_FUNC_get_task_stack: |
1152 | return &bpf_get_task_stack_proto; | |
9fd82b61 AS |
1153 | default: |
1154 | return NULL; | |
1155 | } | |
1156 | } | |
1157 | ||
5e43f899 AI |
1158 | static const struct bpf_func_proto * |
1159 | kprobe_prog_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) | |
9fd82b61 AS |
1160 | { |
1161 | switch (func_id) { | |
a43eec30 AS |
1162 | case BPF_FUNC_perf_event_output: |
1163 | return &bpf_perf_event_output_proto; | |
d5a3b1f6 AS |
1164 | case BPF_FUNC_get_stackid: |
1165 | return &bpf_get_stackid_proto; | |
c195651e YS |
1166 | case BPF_FUNC_get_stack: |
1167 | return &bpf_get_stack_proto; | |
9802d865 JB |
1168 | #ifdef CONFIG_BPF_KPROBE_OVERRIDE |
1169 | case BPF_FUNC_override_return: | |
1170 | return &bpf_override_return_proto; | |
1171 | #endif | |
2541517c | 1172 | default: |
fc611f47 | 1173 | return bpf_tracing_func_proto(func_id, prog); |
2541517c AS |
1174 | } |
1175 | } | |
1176 | ||
1177 | /* bpf+kprobe programs can access fields of 'struct pt_regs' */ | |
19de99f7 | 1178 | static bool kprobe_prog_is_valid_access(int off, int size, enum bpf_access_type type, |
5e43f899 | 1179 | const struct bpf_prog *prog, |
23994631 | 1180 | struct bpf_insn_access_aux *info) |
2541517c | 1181 | { |
2541517c AS |
1182 | if (off < 0 || off >= sizeof(struct pt_regs)) |
1183 | return false; | |
2541517c AS |
1184 | if (type != BPF_READ) |
1185 | return false; | |
2541517c AS |
1186 | if (off % size != 0) |
1187 | return false; | |
2d071c64 DB |
1188 | /* |
1189 | * Assertion for 32 bit to make sure last 8 byte access | |
1190 | * (BPF_DW) to the last 4 byte member is disallowed. | |
1191 | */ | |
1192 | if (off + size > sizeof(struct pt_regs)) | |
1193 | return false; | |
1194 | ||
2541517c AS |
1195 | return true; |
1196 | } | |
1197 | ||
7de16e3a | 1198 | const struct bpf_verifier_ops kprobe_verifier_ops = { |
2541517c AS |
1199 | .get_func_proto = kprobe_prog_func_proto, |
1200 | .is_valid_access = kprobe_prog_is_valid_access, | |
1201 | }; | |
1202 | ||
7de16e3a JK |
1203 | const struct bpf_prog_ops kprobe_prog_ops = { |
1204 | }; | |
1205 | ||
f3694e00 DB |
1206 | BPF_CALL_5(bpf_perf_event_output_tp, void *, tp_buff, struct bpf_map *, map, |
1207 | u64, flags, void *, data, u64, size) | |
9940d67c | 1208 | { |
f3694e00 DB |
1209 | struct pt_regs *regs = *(struct pt_regs **)tp_buff; |
1210 | ||
9940d67c AS |
1211 | /* |
1212 | * r1 points to perf tracepoint buffer where first 8 bytes are hidden | |
1213 | * from bpf program and contain a pointer to 'struct pt_regs'. Fetch it | |
f3694e00 | 1214 | * from there and call the same bpf_perf_event_output() helper inline. |
9940d67c | 1215 | */ |
f3694e00 | 1216 | return ____bpf_perf_event_output(regs, map, flags, data, size); |
9940d67c AS |
1217 | } |
1218 | ||
1219 | static const struct bpf_func_proto bpf_perf_event_output_proto_tp = { | |
1220 | .func = bpf_perf_event_output_tp, | |
1221 | .gpl_only = true, | |
1222 | .ret_type = RET_INTEGER, | |
1223 | .arg1_type = ARG_PTR_TO_CTX, | |
1224 | .arg2_type = ARG_CONST_MAP_PTR, | |
1225 | .arg3_type = ARG_ANYTHING, | |
39f19ebb | 1226 | .arg4_type = ARG_PTR_TO_MEM, |
a60dd35d | 1227 | .arg5_type = ARG_CONST_SIZE_OR_ZERO, |
9940d67c AS |
1228 | }; |
1229 | ||
f3694e00 DB |
1230 | BPF_CALL_3(bpf_get_stackid_tp, void *, tp_buff, struct bpf_map *, map, |
1231 | u64, flags) | |
9940d67c | 1232 | { |
f3694e00 | 1233 | struct pt_regs *regs = *(struct pt_regs **)tp_buff; |
9940d67c | 1234 | |
f3694e00 DB |
1235 | /* |
1236 | * Same comment as in bpf_perf_event_output_tp(), only that this time | |
1237 | * the other helper's function body cannot be inlined due to being | |
1238 | * external, thus we need to call raw helper function. | |
1239 | */ | |
1240 | return bpf_get_stackid((unsigned long) regs, (unsigned long) map, | |
1241 | flags, 0, 0); | |
9940d67c AS |
1242 | } |
1243 | ||
1244 | static const struct bpf_func_proto bpf_get_stackid_proto_tp = { | |
1245 | .func = bpf_get_stackid_tp, | |
1246 | .gpl_only = true, | |
1247 | .ret_type = RET_INTEGER, | |
1248 | .arg1_type = ARG_PTR_TO_CTX, | |
1249 | .arg2_type = ARG_CONST_MAP_PTR, | |
1250 | .arg3_type = ARG_ANYTHING, | |
1251 | }; | |
1252 | ||
c195651e YS |
1253 | BPF_CALL_4(bpf_get_stack_tp, void *, tp_buff, void *, buf, u32, size, |
1254 | u64, flags) | |
1255 | { | |
1256 | struct pt_regs *regs = *(struct pt_regs **)tp_buff; | |
1257 | ||
1258 | return bpf_get_stack((unsigned long) regs, (unsigned long) buf, | |
1259 | (unsigned long) size, flags, 0); | |
1260 | } | |
1261 | ||
1262 | static const struct bpf_func_proto bpf_get_stack_proto_tp = { | |
1263 | .func = bpf_get_stack_tp, | |
1264 | .gpl_only = true, | |
1265 | .ret_type = RET_INTEGER, | |
1266 | .arg1_type = ARG_PTR_TO_CTX, | |
1267 | .arg2_type = ARG_PTR_TO_UNINIT_MEM, | |
1268 | .arg3_type = ARG_CONST_SIZE_OR_ZERO, | |
1269 | .arg4_type = ARG_ANYTHING, | |
1270 | }; | |
1271 | ||
5e43f899 AI |
1272 | static const struct bpf_func_proto * |
1273 | tp_prog_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) | |
f005afed YS |
1274 | { |
1275 | switch (func_id) { | |
1276 | case BPF_FUNC_perf_event_output: | |
1277 | return &bpf_perf_event_output_proto_tp; | |
1278 | case BPF_FUNC_get_stackid: | |
1279 | return &bpf_get_stackid_proto_tp; | |
c195651e YS |
1280 | case BPF_FUNC_get_stack: |
1281 | return &bpf_get_stack_proto_tp; | |
f005afed | 1282 | default: |
fc611f47 | 1283 | return bpf_tracing_func_proto(func_id, prog); |
f005afed YS |
1284 | } |
1285 | } | |
1286 | ||
1287 | static bool tp_prog_is_valid_access(int off, int size, enum bpf_access_type type, | |
5e43f899 | 1288 | const struct bpf_prog *prog, |
f005afed YS |
1289 | struct bpf_insn_access_aux *info) |
1290 | { | |
1291 | if (off < sizeof(void *) || off >= PERF_MAX_TRACE_SIZE) | |
1292 | return false; | |
1293 | if (type != BPF_READ) | |
1294 | return false; | |
1295 | if (off % size != 0) | |
1296 | return false; | |
1297 | ||
1298 | BUILD_BUG_ON(PERF_MAX_TRACE_SIZE % sizeof(__u64)); | |
1299 | return true; | |
1300 | } | |
1301 | ||
1302 | const struct bpf_verifier_ops tracepoint_verifier_ops = { | |
1303 | .get_func_proto = tp_prog_func_proto, | |
1304 | .is_valid_access = tp_prog_is_valid_access, | |
1305 | }; | |
1306 | ||
1307 | const struct bpf_prog_ops tracepoint_prog_ops = { | |
1308 | }; | |
1309 | ||
1310 | BPF_CALL_3(bpf_perf_prog_read_value, struct bpf_perf_event_data_kern *, ctx, | |
4bebdc7a YS |
1311 | struct bpf_perf_event_value *, buf, u32, size) |
1312 | { | |
1313 | int err = -EINVAL; | |
1314 | ||
1315 | if (unlikely(size != sizeof(struct bpf_perf_event_value))) | |
1316 | goto clear; | |
1317 | err = perf_event_read_local(ctx->event, &buf->counter, &buf->enabled, | |
1318 | &buf->running); | |
1319 | if (unlikely(err)) | |
1320 | goto clear; | |
1321 | return 0; | |
1322 | clear: | |
1323 | memset(buf, 0, size); | |
1324 | return err; | |
1325 | } | |
1326 | ||
f005afed YS |
1327 | static const struct bpf_func_proto bpf_perf_prog_read_value_proto = { |
1328 | .func = bpf_perf_prog_read_value, | |
4bebdc7a YS |
1329 | .gpl_only = true, |
1330 | .ret_type = RET_INTEGER, | |
1331 | .arg1_type = ARG_PTR_TO_CTX, | |
1332 | .arg2_type = ARG_PTR_TO_UNINIT_MEM, | |
1333 | .arg3_type = ARG_CONST_SIZE, | |
1334 | }; | |
1335 | ||
fff7b643 DX |
1336 | BPF_CALL_4(bpf_read_branch_records, struct bpf_perf_event_data_kern *, ctx, |
1337 | void *, buf, u32, size, u64, flags) | |
1338 | { | |
1339 | #ifndef CONFIG_X86 | |
1340 | return -ENOENT; | |
1341 | #else | |
1342 | static const u32 br_entry_size = sizeof(struct perf_branch_entry); | |
1343 | struct perf_branch_stack *br_stack = ctx->data->br_stack; | |
1344 | u32 to_copy; | |
1345 | ||
1346 | if (unlikely(flags & ~BPF_F_GET_BRANCH_RECORDS_SIZE)) | |
1347 | return -EINVAL; | |
1348 | ||
1349 | if (unlikely(!br_stack)) | |
1350 | return -EINVAL; | |
1351 | ||
1352 | if (flags & BPF_F_GET_BRANCH_RECORDS_SIZE) | |
1353 | return br_stack->nr * br_entry_size; | |
1354 | ||
1355 | if (!buf || (size % br_entry_size != 0)) | |
1356 | return -EINVAL; | |
1357 | ||
1358 | to_copy = min_t(u32, br_stack->nr * br_entry_size, size); | |
1359 | memcpy(buf, br_stack->entries, to_copy); | |
1360 | ||
1361 | return to_copy; | |
1362 | #endif | |
1363 | } | |
1364 | ||
1365 | static const struct bpf_func_proto bpf_read_branch_records_proto = { | |
1366 | .func = bpf_read_branch_records, | |
1367 | .gpl_only = true, | |
1368 | .ret_type = RET_INTEGER, | |
1369 | .arg1_type = ARG_PTR_TO_CTX, | |
1370 | .arg2_type = ARG_PTR_TO_MEM_OR_NULL, | |
1371 | .arg3_type = ARG_CONST_SIZE_OR_ZERO, | |
1372 | .arg4_type = ARG_ANYTHING, | |
1373 | }; | |
1374 | ||
5e43f899 AI |
1375 | static const struct bpf_func_proto * |
1376 | pe_prog_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) | |
9fd82b61 AS |
1377 | { |
1378 | switch (func_id) { | |
1379 | case BPF_FUNC_perf_event_output: | |
9940d67c | 1380 | return &bpf_perf_event_output_proto_tp; |
9fd82b61 | 1381 | case BPF_FUNC_get_stackid: |
9940d67c | 1382 | return &bpf_get_stackid_proto_tp; |
c195651e YS |
1383 | case BPF_FUNC_get_stack: |
1384 | return &bpf_get_stack_proto_tp; | |
4bebdc7a | 1385 | case BPF_FUNC_perf_prog_read_value: |
f005afed | 1386 | return &bpf_perf_prog_read_value_proto; |
fff7b643 DX |
1387 | case BPF_FUNC_read_branch_records: |
1388 | return &bpf_read_branch_records_proto; | |
9fd82b61 | 1389 | default: |
fc611f47 | 1390 | return bpf_tracing_func_proto(func_id, prog); |
9fd82b61 AS |
1391 | } |
1392 | } | |
1393 | ||
c4f6699d AS |
1394 | /* |
1395 | * bpf_raw_tp_regs are separate from bpf_pt_regs used from skb/xdp | |
1396 | * to avoid potential recursive reuse issue when/if tracepoints are added | |
9594dc3c MM |
1397 | * inside bpf_*_event_output, bpf_get_stackid and/or bpf_get_stack. |
1398 | * | |
1399 | * Since raw tracepoints run despite bpf_prog_active, support concurrent usage | |
1400 | * in normal, irq, and nmi context. | |
c4f6699d | 1401 | */ |
9594dc3c MM |
1402 | struct bpf_raw_tp_regs { |
1403 | struct pt_regs regs[3]; | |
1404 | }; | |
1405 | static DEFINE_PER_CPU(struct bpf_raw_tp_regs, bpf_raw_tp_regs); | |
1406 | static DEFINE_PER_CPU(int, bpf_raw_tp_nest_level); | |
1407 | static struct pt_regs *get_bpf_raw_tp_regs(void) | |
1408 | { | |
1409 | struct bpf_raw_tp_regs *tp_regs = this_cpu_ptr(&bpf_raw_tp_regs); | |
1410 | int nest_level = this_cpu_inc_return(bpf_raw_tp_nest_level); | |
1411 | ||
1412 | if (WARN_ON_ONCE(nest_level > ARRAY_SIZE(tp_regs->regs))) { | |
1413 | this_cpu_dec(bpf_raw_tp_nest_level); | |
1414 | return ERR_PTR(-EBUSY); | |
1415 | } | |
1416 | ||
1417 | return &tp_regs->regs[nest_level - 1]; | |
1418 | } | |
1419 | ||
1420 | static void put_bpf_raw_tp_regs(void) | |
1421 | { | |
1422 | this_cpu_dec(bpf_raw_tp_nest_level); | |
1423 | } | |
1424 | ||
c4f6699d AS |
1425 | BPF_CALL_5(bpf_perf_event_output_raw_tp, struct bpf_raw_tracepoint_args *, args, |
1426 | struct bpf_map *, map, u64, flags, void *, data, u64, size) | |
1427 | { | |
9594dc3c MM |
1428 | struct pt_regs *regs = get_bpf_raw_tp_regs(); |
1429 | int ret; | |
1430 | ||
1431 | if (IS_ERR(regs)) | |
1432 | return PTR_ERR(regs); | |
c4f6699d AS |
1433 | |
1434 | perf_fetch_caller_regs(regs); | |
9594dc3c MM |
1435 | ret = ____bpf_perf_event_output(regs, map, flags, data, size); |
1436 | ||
1437 | put_bpf_raw_tp_regs(); | |
1438 | return ret; | |
c4f6699d AS |
1439 | } |
1440 | ||
1441 | static const struct bpf_func_proto bpf_perf_event_output_proto_raw_tp = { | |
1442 | .func = bpf_perf_event_output_raw_tp, | |
1443 | .gpl_only = true, | |
1444 | .ret_type = RET_INTEGER, | |
1445 | .arg1_type = ARG_PTR_TO_CTX, | |
1446 | .arg2_type = ARG_CONST_MAP_PTR, | |
1447 | .arg3_type = ARG_ANYTHING, | |
1448 | .arg4_type = ARG_PTR_TO_MEM, | |
1449 | .arg5_type = ARG_CONST_SIZE_OR_ZERO, | |
1450 | }; | |
1451 | ||
a7658e1a | 1452 | extern const struct bpf_func_proto bpf_skb_output_proto; |
d831ee84 | 1453 | extern const struct bpf_func_proto bpf_xdp_output_proto; |
a7658e1a | 1454 | |
c4f6699d AS |
1455 | BPF_CALL_3(bpf_get_stackid_raw_tp, struct bpf_raw_tracepoint_args *, args, |
1456 | struct bpf_map *, map, u64, flags) | |
1457 | { | |
9594dc3c MM |
1458 | struct pt_regs *regs = get_bpf_raw_tp_regs(); |
1459 | int ret; | |
1460 | ||
1461 | if (IS_ERR(regs)) | |
1462 | return PTR_ERR(regs); | |
c4f6699d AS |
1463 | |
1464 | perf_fetch_caller_regs(regs); | |
1465 | /* similar to bpf_perf_event_output_tp, but pt_regs fetched differently */ | |
9594dc3c MM |
1466 | ret = bpf_get_stackid((unsigned long) regs, (unsigned long) map, |
1467 | flags, 0, 0); | |
1468 | put_bpf_raw_tp_regs(); | |
1469 | return ret; | |
c4f6699d AS |
1470 | } |
1471 | ||
1472 | static const struct bpf_func_proto bpf_get_stackid_proto_raw_tp = { | |
1473 | .func = bpf_get_stackid_raw_tp, | |
1474 | .gpl_only = true, | |
1475 | .ret_type = RET_INTEGER, | |
1476 | .arg1_type = ARG_PTR_TO_CTX, | |
1477 | .arg2_type = ARG_CONST_MAP_PTR, | |
1478 | .arg3_type = ARG_ANYTHING, | |
1479 | }; | |
1480 | ||
c195651e YS |
1481 | BPF_CALL_4(bpf_get_stack_raw_tp, struct bpf_raw_tracepoint_args *, args, |
1482 | void *, buf, u32, size, u64, flags) | |
1483 | { | |
9594dc3c MM |
1484 | struct pt_regs *regs = get_bpf_raw_tp_regs(); |
1485 | int ret; | |
1486 | ||
1487 | if (IS_ERR(regs)) | |
1488 | return PTR_ERR(regs); | |
c195651e YS |
1489 | |
1490 | perf_fetch_caller_regs(regs); | |
9594dc3c MM |
1491 | ret = bpf_get_stack((unsigned long) regs, (unsigned long) buf, |
1492 | (unsigned long) size, flags, 0); | |
1493 | put_bpf_raw_tp_regs(); | |
1494 | return ret; | |
c195651e YS |
1495 | } |
1496 | ||
1497 | static const struct bpf_func_proto bpf_get_stack_proto_raw_tp = { | |
1498 | .func = bpf_get_stack_raw_tp, | |
1499 | .gpl_only = true, | |
1500 | .ret_type = RET_INTEGER, | |
1501 | .arg1_type = ARG_PTR_TO_CTX, | |
1502 | .arg2_type = ARG_PTR_TO_MEM, | |
1503 | .arg3_type = ARG_CONST_SIZE_OR_ZERO, | |
1504 | .arg4_type = ARG_ANYTHING, | |
1505 | }; | |
1506 | ||
5e43f899 AI |
1507 | static const struct bpf_func_proto * |
1508 | raw_tp_prog_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) | |
c4f6699d AS |
1509 | { |
1510 | switch (func_id) { | |
1511 | case BPF_FUNC_perf_event_output: | |
1512 | return &bpf_perf_event_output_proto_raw_tp; | |
1513 | case BPF_FUNC_get_stackid: | |
1514 | return &bpf_get_stackid_proto_raw_tp; | |
c195651e YS |
1515 | case BPF_FUNC_get_stack: |
1516 | return &bpf_get_stack_proto_raw_tp; | |
c4f6699d | 1517 | default: |
fc611f47 | 1518 | return bpf_tracing_func_proto(func_id, prog); |
c4f6699d AS |
1519 | } |
1520 | } | |
1521 | ||
958a3f2d | 1522 | const struct bpf_func_proto * |
f1b9509c AS |
1523 | tracing_prog_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) |
1524 | { | |
1525 | switch (func_id) { | |
1526 | #ifdef CONFIG_NET | |
1527 | case BPF_FUNC_skb_output: | |
1528 | return &bpf_skb_output_proto; | |
d831ee84 EC |
1529 | case BPF_FUNC_xdp_output: |
1530 | return &bpf_xdp_output_proto; | |
af7ec138 YS |
1531 | case BPF_FUNC_skc_to_tcp6_sock: |
1532 | return &bpf_skc_to_tcp6_sock_proto; | |
478cfbdf YS |
1533 | case BPF_FUNC_skc_to_tcp_sock: |
1534 | return &bpf_skc_to_tcp_sock_proto; | |
1535 | case BPF_FUNC_skc_to_tcp_timewait_sock: | |
1536 | return &bpf_skc_to_tcp_timewait_sock_proto; | |
1537 | case BPF_FUNC_skc_to_tcp_request_sock: | |
1538 | return &bpf_skc_to_tcp_request_sock_proto; | |
0d4fad3e YS |
1539 | case BPF_FUNC_skc_to_udp6_sock: |
1540 | return &bpf_skc_to_udp6_sock_proto; | |
f1b9509c | 1541 | #endif |
492e639f YS |
1542 | case BPF_FUNC_seq_printf: |
1543 | return prog->expected_attach_type == BPF_TRACE_ITER ? | |
1544 | &bpf_seq_printf_proto : | |
1545 | NULL; | |
1546 | case BPF_FUNC_seq_write: | |
1547 | return prog->expected_attach_type == BPF_TRACE_ITER ? | |
1548 | &bpf_seq_write_proto : | |
1549 | NULL; | |
f1b9509c AS |
1550 | default: |
1551 | return raw_tp_prog_func_proto(func_id, prog); | |
1552 | } | |
1553 | } | |
1554 | ||
c4f6699d AS |
1555 | static bool raw_tp_prog_is_valid_access(int off, int size, |
1556 | enum bpf_access_type type, | |
5e43f899 | 1557 | const struct bpf_prog *prog, |
c4f6699d AS |
1558 | struct bpf_insn_access_aux *info) |
1559 | { | |
f1b9509c AS |
1560 | if (off < 0 || off >= sizeof(__u64) * MAX_BPF_FUNC_ARGS) |
1561 | return false; | |
1562 | if (type != BPF_READ) | |
1563 | return false; | |
1564 | if (off % size != 0) | |
1565 | return false; | |
1566 | return true; | |
1567 | } | |
1568 | ||
1569 | static bool tracing_prog_is_valid_access(int off, int size, | |
1570 | enum bpf_access_type type, | |
1571 | const struct bpf_prog *prog, | |
1572 | struct bpf_insn_access_aux *info) | |
1573 | { | |
1574 | if (off < 0 || off >= sizeof(__u64) * MAX_BPF_FUNC_ARGS) | |
c4f6699d AS |
1575 | return false; |
1576 | if (type != BPF_READ) | |
1577 | return false; | |
1578 | if (off % size != 0) | |
1579 | return false; | |
9e15db66 | 1580 | return btf_ctx_access(off, size, type, prog, info); |
c4f6699d AS |
1581 | } |
1582 | ||
3e7c67d9 KS |
1583 | int __weak bpf_prog_test_run_tracing(struct bpf_prog *prog, |
1584 | const union bpf_attr *kattr, | |
1585 | union bpf_attr __user *uattr) | |
1586 | { | |
1587 | return -ENOTSUPP; | |
1588 | } | |
1589 | ||
c4f6699d AS |
1590 | const struct bpf_verifier_ops raw_tracepoint_verifier_ops = { |
1591 | .get_func_proto = raw_tp_prog_func_proto, | |
1592 | .is_valid_access = raw_tp_prog_is_valid_access, | |
1593 | }; | |
1594 | ||
1595 | const struct bpf_prog_ops raw_tracepoint_prog_ops = { | |
1596 | }; | |
1597 | ||
f1b9509c AS |
1598 | const struct bpf_verifier_ops tracing_verifier_ops = { |
1599 | .get_func_proto = tracing_prog_func_proto, | |
1600 | .is_valid_access = tracing_prog_is_valid_access, | |
1601 | }; | |
1602 | ||
1603 | const struct bpf_prog_ops tracing_prog_ops = { | |
da00d2f1 | 1604 | .test_run = bpf_prog_test_run_tracing, |
f1b9509c AS |
1605 | }; |
1606 | ||
9df1c28b MM |
1607 | static bool raw_tp_writable_prog_is_valid_access(int off, int size, |
1608 | enum bpf_access_type type, | |
1609 | const struct bpf_prog *prog, | |
1610 | struct bpf_insn_access_aux *info) | |
1611 | { | |
1612 | if (off == 0) { | |
1613 | if (size != sizeof(u64) || type != BPF_READ) | |
1614 | return false; | |
1615 | info->reg_type = PTR_TO_TP_BUFFER; | |
1616 | } | |
1617 | return raw_tp_prog_is_valid_access(off, size, type, prog, info); | |
1618 | } | |
1619 | ||
1620 | const struct bpf_verifier_ops raw_tracepoint_writable_verifier_ops = { | |
1621 | .get_func_proto = raw_tp_prog_func_proto, | |
1622 | .is_valid_access = raw_tp_writable_prog_is_valid_access, | |
1623 | }; | |
1624 | ||
1625 | const struct bpf_prog_ops raw_tracepoint_writable_prog_ops = { | |
1626 | }; | |
1627 | ||
0515e599 | 1628 | static bool pe_prog_is_valid_access(int off, int size, enum bpf_access_type type, |
5e43f899 | 1629 | const struct bpf_prog *prog, |
23994631 | 1630 | struct bpf_insn_access_aux *info) |
0515e599 | 1631 | { |
95da0cdb | 1632 | const int size_u64 = sizeof(u64); |
31fd8581 | 1633 | |
0515e599 AS |
1634 | if (off < 0 || off >= sizeof(struct bpf_perf_event_data)) |
1635 | return false; | |
1636 | if (type != BPF_READ) | |
1637 | return false; | |
bc23105c DB |
1638 | if (off % size != 0) { |
1639 | if (sizeof(unsigned long) != 4) | |
1640 | return false; | |
1641 | if (size != 8) | |
1642 | return false; | |
1643 | if (off % size != 4) | |
1644 | return false; | |
1645 | } | |
31fd8581 | 1646 | |
f96da094 DB |
1647 | switch (off) { |
1648 | case bpf_ctx_range(struct bpf_perf_event_data, sample_period): | |
95da0cdb TQ |
1649 | bpf_ctx_record_field_size(info, size_u64); |
1650 | if (!bpf_ctx_narrow_access_ok(off, size, size_u64)) | |
1651 | return false; | |
1652 | break; | |
1653 | case bpf_ctx_range(struct bpf_perf_event_data, addr): | |
1654 | bpf_ctx_record_field_size(info, size_u64); | |
1655 | if (!bpf_ctx_narrow_access_ok(off, size, size_u64)) | |
23994631 | 1656 | return false; |
f96da094 DB |
1657 | break; |
1658 | default: | |
0515e599 AS |
1659 | if (size != sizeof(long)) |
1660 | return false; | |
1661 | } | |
f96da094 | 1662 | |
0515e599 AS |
1663 | return true; |
1664 | } | |
1665 | ||
6b8cc1d1 DB |
1666 | static u32 pe_prog_convert_ctx_access(enum bpf_access_type type, |
1667 | const struct bpf_insn *si, | |
0515e599 | 1668 | struct bpf_insn *insn_buf, |
f96da094 | 1669 | struct bpf_prog *prog, u32 *target_size) |
0515e599 AS |
1670 | { |
1671 | struct bpf_insn *insn = insn_buf; | |
1672 | ||
6b8cc1d1 | 1673 | switch (si->off) { |
0515e599 | 1674 | case offsetof(struct bpf_perf_event_data, sample_period): |
f035a515 | 1675 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct bpf_perf_event_data_kern, |
6b8cc1d1 | 1676 | data), si->dst_reg, si->src_reg, |
0515e599 | 1677 | offsetof(struct bpf_perf_event_data_kern, data)); |
6b8cc1d1 | 1678 | *insn++ = BPF_LDX_MEM(BPF_DW, si->dst_reg, si->dst_reg, |
f96da094 DB |
1679 | bpf_target_off(struct perf_sample_data, period, 8, |
1680 | target_size)); | |
0515e599 | 1681 | break; |
95da0cdb TQ |
1682 | case offsetof(struct bpf_perf_event_data, addr): |
1683 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct bpf_perf_event_data_kern, | |
1684 | data), si->dst_reg, si->src_reg, | |
1685 | offsetof(struct bpf_perf_event_data_kern, data)); | |
1686 | *insn++ = BPF_LDX_MEM(BPF_DW, si->dst_reg, si->dst_reg, | |
1687 | bpf_target_off(struct perf_sample_data, addr, 8, | |
1688 | target_size)); | |
1689 | break; | |
0515e599 | 1690 | default: |
f035a515 | 1691 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct bpf_perf_event_data_kern, |
6b8cc1d1 | 1692 | regs), si->dst_reg, si->src_reg, |
0515e599 | 1693 | offsetof(struct bpf_perf_event_data_kern, regs)); |
6b8cc1d1 DB |
1694 | *insn++ = BPF_LDX_MEM(BPF_SIZEOF(long), si->dst_reg, si->dst_reg, |
1695 | si->off); | |
0515e599 AS |
1696 | break; |
1697 | } | |
1698 | ||
1699 | return insn - insn_buf; | |
1700 | } | |
1701 | ||
7de16e3a | 1702 | const struct bpf_verifier_ops perf_event_verifier_ops = { |
f005afed | 1703 | .get_func_proto = pe_prog_func_proto, |
0515e599 AS |
1704 | .is_valid_access = pe_prog_is_valid_access, |
1705 | .convert_ctx_access = pe_prog_convert_ctx_access, | |
1706 | }; | |
7de16e3a JK |
1707 | |
1708 | const struct bpf_prog_ops perf_event_prog_ops = { | |
1709 | }; | |
e87c6bc3 YS |
1710 | |
1711 | static DEFINE_MUTEX(bpf_event_mutex); | |
1712 | ||
c8c088ba YS |
1713 | #define BPF_TRACE_MAX_PROGS 64 |
1714 | ||
e87c6bc3 YS |
1715 | int perf_event_attach_bpf_prog(struct perf_event *event, |
1716 | struct bpf_prog *prog) | |
1717 | { | |
e672db03 | 1718 | struct bpf_prog_array *old_array; |
e87c6bc3 YS |
1719 | struct bpf_prog_array *new_array; |
1720 | int ret = -EEXIST; | |
1721 | ||
9802d865 | 1722 | /* |
b4da3340 MH |
1723 | * Kprobe override only works if they are on the function entry, |
1724 | * and only if they are on the opt-in list. | |
9802d865 JB |
1725 | */ |
1726 | if (prog->kprobe_override && | |
b4da3340 | 1727 | (!trace_kprobe_on_func_entry(event->tp_event) || |
9802d865 JB |
1728 | !trace_kprobe_error_injectable(event->tp_event))) |
1729 | return -EINVAL; | |
1730 | ||
e87c6bc3 YS |
1731 | mutex_lock(&bpf_event_mutex); |
1732 | ||
1733 | if (event->prog) | |
07c41a29 | 1734 | goto unlock; |
e87c6bc3 | 1735 | |
e672db03 | 1736 | old_array = bpf_event_rcu_dereference(event->tp_event->prog_array); |
c8c088ba YS |
1737 | if (old_array && |
1738 | bpf_prog_array_length(old_array) >= BPF_TRACE_MAX_PROGS) { | |
1739 | ret = -E2BIG; | |
1740 | goto unlock; | |
1741 | } | |
1742 | ||
e87c6bc3 YS |
1743 | ret = bpf_prog_array_copy(old_array, NULL, prog, &new_array); |
1744 | if (ret < 0) | |
07c41a29 | 1745 | goto unlock; |
e87c6bc3 YS |
1746 | |
1747 | /* set the new array to event->tp_event and set event->prog */ | |
1748 | event->prog = prog; | |
1749 | rcu_assign_pointer(event->tp_event->prog_array, new_array); | |
1750 | bpf_prog_array_free(old_array); | |
1751 | ||
07c41a29 | 1752 | unlock: |
e87c6bc3 YS |
1753 | mutex_unlock(&bpf_event_mutex); |
1754 | return ret; | |
1755 | } | |
1756 | ||
1757 | void perf_event_detach_bpf_prog(struct perf_event *event) | |
1758 | { | |
e672db03 | 1759 | struct bpf_prog_array *old_array; |
e87c6bc3 YS |
1760 | struct bpf_prog_array *new_array; |
1761 | int ret; | |
1762 | ||
1763 | mutex_lock(&bpf_event_mutex); | |
1764 | ||
1765 | if (!event->prog) | |
07c41a29 | 1766 | goto unlock; |
e87c6bc3 | 1767 | |
e672db03 | 1768 | old_array = bpf_event_rcu_dereference(event->tp_event->prog_array); |
e87c6bc3 | 1769 | ret = bpf_prog_array_copy(old_array, event->prog, NULL, &new_array); |
170a7e3e SY |
1770 | if (ret == -ENOENT) |
1771 | goto unlock; | |
e87c6bc3 YS |
1772 | if (ret < 0) { |
1773 | bpf_prog_array_delete_safe(old_array, event->prog); | |
1774 | } else { | |
1775 | rcu_assign_pointer(event->tp_event->prog_array, new_array); | |
1776 | bpf_prog_array_free(old_array); | |
1777 | } | |
1778 | ||
1779 | bpf_prog_put(event->prog); | |
1780 | event->prog = NULL; | |
1781 | ||
07c41a29 | 1782 | unlock: |
e87c6bc3 YS |
1783 | mutex_unlock(&bpf_event_mutex); |
1784 | } | |
f371b304 | 1785 | |
f4e2298e | 1786 | int perf_event_query_prog_array(struct perf_event *event, void __user *info) |
f371b304 YS |
1787 | { |
1788 | struct perf_event_query_bpf __user *uquery = info; | |
1789 | struct perf_event_query_bpf query = {}; | |
e672db03 | 1790 | struct bpf_prog_array *progs; |
3a38bb98 | 1791 | u32 *ids, prog_cnt, ids_len; |
f371b304 YS |
1792 | int ret; |
1793 | ||
031258da | 1794 | if (!perfmon_capable()) |
f371b304 YS |
1795 | return -EPERM; |
1796 | if (event->attr.type != PERF_TYPE_TRACEPOINT) | |
1797 | return -EINVAL; | |
1798 | if (copy_from_user(&query, uquery, sizeof(query))) | |
1799 | return -EFAULT; | |
3a38bb98 YS |
1800 | |
1801 | ids_len = query.ids_len; | |
1802 | if (ids_len > BPF_TRACE_MAX_PROGS) | |
9c481b90 | 1803 | return -E2BIG; |
3a38bb98 YS |
1804 | ids = kcalloc(ids_len, sizeof(u32), GFP_USER | __GFP_NOWARN); |
1805 | if (!ids) | |
1806 | return -ENOMEM; | |
1807 | /* | |
1808 | * The above kcalloc returns ZERO_SIZE_PTR when ids_len = 0, which | |
1809 | * is required when user only wants to check for uquery->prog_cnt. | |
1810 | * There is no need to check for it since the case is handled | |
1811 | * gracefully in bpf_prog_array_copy_info. | |
1812 | */ | |
f371b304 YS |
1813 | |
1814 | mutex_lock(&bpf_event_mutex); | |
e672db03 SF |
1815 | progs = bpf_event_rcu_dereference(event->tp_event->prog_array); |
1816 | ret = bpf_prog_array_copy_info(progs, ids, ids_len, &prog_cnt); | |
f371b304 YS |
1817 | mutex_unlock(&bpf_event_mutex); |
1818 | ||
3a38bb98 YS |
1819 | if (copy_to_user(&uquery->prog_cnt, &prog_cnt, sizeof(prog_cnt)) || |
1820 | copy_to_user(uquery->ids, ids, ids_len * sizeof(u32))) | |
1821 | ret = -EFAULT; | |
1822 | ||
1823 | kfree(ids); | |
f371b304 YS |
1824 | return ret; |
1825 | } | |
c4f6699d AS |
1826 | |
1827 | extern struct bpf_raw_event_map __start__bpf_raw_tp[]; | |
1828 | extern struct bpf_raw_event_map __stop__bpf_raw_tp[]; | |
1829 | ||
a38d1107 | 1830 | struct bpf_raw_event_map *bpf_get_raw_tracepoint(const char *name) |
c4f6699d AS |
1831 | { |
1832 | struct bpf_raw_event_map *btp = __start__bpf_raw_tp; | |
1833 | ||
1834 | for (; btp < __stop__bpf_raw_tp; btp++) { | |
1835 | if (!strcmp(btp->tp->name, name)) | |
1836 | return btp; | |
1837 | } | |
a38d1107 MM |
1838 | |
1839 | return bpf_get_raw_tracepoint_module(name); | |
1840 | } | |
1841 | ||
1842 | void bpf_put_raw_tracepoint(struct bpf_raw_event_map *btp) | |
1843 | { | |
1844 | struct module *mod = __module_address((unsigned long)btp); | |
1845 | ||
1846 | if (mod) | |
1847 | module_put(mod); | |
c4f6699d AS |
1848 | } |
1849 | ||
1850 | static __always_inline | |
1851 | void __bpf_trace_run(struct bpf_prog *prog, u64 *args) | |
1852 | { | |
f03efe49 | 1853 | cant_sleep(); |
c4f6699d | 1854 | rcu_read_lock(); |
c4f6699d | 1855 | (void) BPF_PROG_RUN(prog, args); |
c4f6699d AS |
1856 | rcu_read_unlock(); |
1857 | } | |
1858 | ||
1859 | #define UNPACK(...) __VA_ARGS__ | |
1860 | #define REPEAT_1(FN, DL, X, ...) FN(X) | |
1861 | #define REPEAT_2(FN, DL, X, ...) FN(X) UNPACK DL REPEAT_1(FN, DL, __VA_ARGS__) | |
1862 | #define REPEAT_3(FN, DL, X, ...) FN(X) UNPACK DL REPEAT_2(FN, DL, __VA_ARGS__) | |
1863 | #define REPEAT_4(FN, DL, X, ...) FN(X) UNPACK DL REPEAT_3(FN, DL, __VA_ARGS__) | |
1864 | #define REPEAT_5(FN, DL, X, ...) FN(X) UNPACK DL REPEAT_4(FN, DL, __VA_ARGS__) | |
1865 | #define REPEAT_6(FN, DL, X, ...) FN(X) UNPACK DL REPEAT_5(FN, DL, __VA_ARGS__) | |
1866 | #define REPEAT_7(FN, DL, X, ...) FN(X) UNPACK DL REPEAT_6(FN, DL, __VA_ARGS__) | |
1867 | #define REPEAT_8(FN, DL, X, ...) FN(X) UNPACK DL REPEAT_7(FN, DL, __VA_ARGS__) | |
1868 | #define REPEAT_9(FN, DL, X, ...) FN(X) UNPACK DL REPEAT_8(FN, DL, __VA_ARGS__) | |
1869 | #define REPEAT_10(FN, DL, X, ...) FN(X) UNPACK DL REPEAT_9(FN, DL, __VA_ARGS__) | |
1870 | #define REPEAT_11(FN, DL, X, ...) FN(X) UNPACK DL REPEAT_10(FN, DL, __VA_ARGS__) | |
1871 | #define REPEAT_12(FN, DL, X, ...) FN(X) UNPACK DL REPEAT_11(FN, DL, __VA_ARGS__) | |
1872 | #define REPEAT(X, FN, DL, ...) REPEAT_##X(FN, DL, __VA_ARGS__) | |
1873 | ||
1874 | #define SARG(X) u64 arg##X | |
1875 | #define COPY(X) args[X] = arg##X | |
1876 | ||
1877 | #define __DL_COM (,) | |
1878 | #define __DL_SEM (;) | |
1879 | ||
1880 | #define __SEQ_0_11 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 | |
1881 | ||
1882 | #define BPF_TRACE_DEFN_x(x) \ | |
1883 | void bpf_trace_run##x(struct bpf_prog *prog, \ | |
1884 | REPEAT(x, SARG, __DL_COM, __SEQ_0_11)) \ | |
1885 | { \ | |
1886 | u64 args[x]; \ | |
1887 | REPEAT(x, COPY, __DL_SEM, __SEQ_0_11); \ | |
1888 | __bpf_trace_run(prog, args); \ | |
1889 | } \ | |
1890 | EXPORT_SYMBOL_GPL(bpf_trace_run##x) | |
1891 | BPF_TRACE_DEFN_x(1); | |
1892 | BPF_TRACE_DEFN_x(2); | |
1893 | BPF_TRACE_DEFN_x(3); | |
1894 | BPF_TRACE_DEFN_x(4); | |
1895 | BPF_TRACE_DEFN_x(5); | |
1896 | BPF_TRACE_DEFN_x(6); | |
1897 | BPF_TRACE_DEFN_x(7); | |
1898 | BPF_TRACE_DEFN_x(8); | |
1899 | BPF_TRACE_DEFN_x(9); | |
1900 | BPF_TRACE_DEFN_x(10); | |
1901 | BPF_TRACE_DEFN_x(11); | |
1902 | BPF_TRACE_DEFN_x(12); | |
1903 | ||
1904 | static int __bpf_probe_register(struct bpf_raw_event_map *btp, struct bpf_prog *prog) | |
1905 | { | |
1906 | struct tracepoint *tp = btp->tp; | |
1907 | ||
1908 | /* | |
1909 | * check that program doesn't access arguments beyond what's | |
1910 | * available in this tracepoint | |
1911 | */ | |
1912 | if (prog->aux->max_ctx_offset > btp->num_args * sizeof(u64)) | |
1913 | return -EINVAL; | |
1914 | ||
9df1c28b MM |
1915 | if (prog->aux->max_tp_access > btp->writable_size) |
1916 | return -EINVAL; | |
1917 | ||
c4f6699d AS |
1918 | return tracepoint_probe_register(tp, (void *)btp->bpf_func, prog); |
1919 | } | |
1920 | ||
1921 | int bpf_probe_register(struct bpf_raw_event_map *btp, struct bpf_prog *prog) | |
1922 | { | |
e16ec340 | 1923 | return __bpf_probe_register(btp, prog); |
c4f6699d AS |
1924 | } |
1925 | ||
1926 | int bpf_probe_unregister(struct bpf_raw_event_map *btp, struct bpf_prog *prog) | |
1927 | { | |
e16ec340 | 1928 | return tracepoint_probe_unregister(btp->tp, (void *)btp->bpf_func, prog); |
c4f6699d | 1929 | } |
41bdc4b4 YS |
1930 | |
1931 | int bpf_get_perf_event_info(const struct perf_event *event, u32 *prog_id, | |
1932 | u32 *fd_type, const char **buf, | |
1933 | u64 *probe_offset, u64 *probe_addr) | |
1934 | { | |
1935 | bool is_tracepoint, is_syscall_tp; | |
1936 | struct bpf_prog *prog; | |
1937 | int flags, err = 0; | |
1938 | ||
1939 | prog = event->prog; | |
1940 | if (!prog) | |
1941 | return -ENOENT; | |
1942 | ||
1943 | /* not supporting BPF_PROG_TYPE_PERF_EVENT yet */ | |
1944 | if (prog->type == BPF_PROG_TYPE_PERF_EVENT) | |
1945 | return -EOPNOTSUPP; | |
1946 | ||
1947 | *prog_id = prog->aux->id; | |
1948 | flags = event->tp_event->flags; | |
1949 | is_tracepoint = flags & TRACE_EVENT_FL_TRACEPOINT; | |
1950 | is_syscall_tp = is_syscall_trace_event(event->tp_event); | |
1951 | ||
1952 | if (is_tracepoint || is_syscall_tp) { | |
1953 | *buf = is_tracepoint ? event->tp_event->tp->name | |
1954 | : event->tp_event->name; | |
1955 | *fd_type = BPF_FD_TYPE_TRACEPOINT; | |
1956 | *probe_offset = 0x0; | |
1957 | *probe_addr = 0x0; | |
1958 | } else { | |
1959 | /* kprobe/uprobe */ | |
1960 | err = -EOPNOTSUPP; | |
1961 | #ifdef CONFIG_KPROBE_EVENTS | |
1962 | if (flags & TRACE_EVENT_FL_KPROBE) | |
1963 | err = bpf_get_kprobe_info(event, fd_type, buf, | |
1964 | probe_offset, probe_addr, | |
1965 | event->attr.type == PERF_TYPE_TRACEPOINT); | |
1966 | #endif | |
1967 | #ifdef CONFIG_UPROBE_EVENTS | |
1968 | if (flags & TRACE_EVENT_FL_UPROBE) | |
1969 | err = bpf_get_uprobe_info(event, fd_type, buf, | |
1970 | probe_offset, | |
1971 | event->attr.type == PERF_TYPE_TRACEPOINT); | |
1972 | #endif | |
1973 | } | |
1974 | ||
1975 | return err; | |
1976 | } | |
a38d1107 | 1977 | |
9db1ff0a YS |
1978 | static int __init send_signal_irq_work_init(void) |
1979 | { | |
1980 | int cpu; | |
1981 | struct send_signal_irq_work *work; | |
1982 | ||
1983 | for_each_possible_cpu(cpu) { | |
1984 | work = per_cpu_ptr(&send_signal_work, cpu); | |
1985 | init_irq_work(&work->irq_work, do_bpf_send_signal); | |
1986 | } | |
1987 | return 0; | |
1988 | } | |
1989 | ||
1990 | subsys_initcall(send_signal_irq_work_init); | |
1991 | ||
a38d1107 | 1992 | #ifdef CONFIG_MODULES |
390e99cf SF |
1993 | static int bpf_event_notify(struct notifier_block *nb, unsigned long op, |
1994 | void *module) | |
a38d1107 MM |
1995 | { |
1996 | struct bpf_trace_module *btm, *tmp; | |
1997 | struct module *mod = module; | |
1998 | ||
1999 | if (mod->num_bpf_raw_events == 0 || | |
2000 | (op != MODULE_STATE_COMING && op != MODULE_STATE_GOING)) | |
2001 | return 0; | |
2002 | ||
2003 | mutex_lock(&bpf_module_mutex); | |
2004 | ||
2005 | switch (op) { | |
2006 | case MODULE_STATE_COMING: | |
2007 | btm = kzalloc(sizeof(*btm), GFP_KERNEL); | |
2008 | if (btm) { | |
2009 | btm->module = module; | |
2010 | list_add(&btm->list, &bpf_trace_modules); | |
2011 | } | |
2012 | break; | |
2013 | case MODULE_STATE_GOING: | |
2014 | list_for_each_entry_safe(btm, tmp, &bpf_trace_modules, list) { | |
2015 | if (btm->module == module) { | |
2016 | list_del(&btm->list); | |
2017 | kfree(btm); | |
2018 | break; | |
2019 | } | |
2020 | } | |
2021 | break; | |
2022 | } | |
2023 | ||
2024 | mutex_unlock(&bpf_module_mutex); | |
2025 | ||
2026 | return 0; | |
2027 | } | |
2028 | ||
2029 | static struct notifier_block bpf_module_nb = { | |
2030 | .notifier_call = bpf_event_notify, | |
2031 | }; | |
2032 | ||
390e99cf | 2033 | static int __init bpf_event_init(void) |
a38d1107 MM |
2034 | { |
2035 | register_module_notifier(&bpf_module_nb); | |
2036 | return 0; | |
2037 | } | |
2038 | ||
2039 | fs_initcall(bpf_event_init); | |
2040 | #endif /* CONFIG_MODULES */ |