Commit | Line | Data |
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2541517c AS |
1 | /* Copyright (c) 2011-2015 PLUMgrid, http://plumgrid.com |
2 | * | |
3 | * This program is free software; you can redistribute it and/or | |
4 | * modify it under the terms of version 2 of the GNU General Public | |
5 | * License as published by the Free Software Foundation. | |
6 | */ | |
7 | #include <linux/kernel.h> | |
8 | #include <linux/types.h> | |
9 | #include <linux/slab.h> | |
10 | #include <linux/bpf.h> | |
11 | #include <linux/filter.h> | |
12 | #include <linux/uaccess.h> | |
9c959c86 | 13 | #include <linux/ctype.h> |
2541517c AS |
14 | #include "trace.h" |
15 | ||
2541517c AS |
16 | /** |
17 | * trace_call_bpf - invoke BPF program | |
18 | * @prog: BPF program | |
19 | * @ctx: opaque context pointer | |
20 | * | |
21 | * kprobe handlers execute BPF programs via this helper. | |
22 | * Can be used from static tracepoints in the future. | |
23 | * | |
24 | * Return: BPF programs always return an integer which is interpreted by | |
25 | * kprobe handler as: | |
26 | * 0 - return from kprobe (event is filtered out) | |
27 | * 1 - store kprobe event into ring buffer | |
28 | * Other values are reserved and currently alias to 1 | |
29 | */ | |
30 | unsigned int trace_call_bpf(struct bpf_prog *prog, void *ctx) | |
31 | { | |
32 | unsigned int ret; | |
33 | ||
34 | if (in_nmi()) /* not supported yet */ | |
35 | return 1; | |
36 | ||
37 | preempt_disable(); | |
38 | ||
39 | if (unlikely(__this_cpu_inc_return(bpf_prog_active) != 1)) { | |
40 | /* | |
41 | * since some bpf program is already running on this cpu, | |
42 | * don't call into another bpf program (same or different) | |
43 | * and don't send kprobe event into ring-buffer, | |
44 | * so return zero here | |
45 | */ | |
46 | ret = 0; | |
47 | goto out; | |
48 | } | |
49 | ||
50 | rcu_read_lock(); | |
51 | ret = BPF_PROG_RUN(prog, ctx); | |
52 | rcu_read_unlock(); | |
53 | ||
54 | out: | |
55 | __this_cpu_dec(bpf_prog_active); | |
56 | preempt_enable(); | |
57 | ||
58 | return ret; | |
59 | } | |
60 | EXPORT_SYMBOL_GPL(trace_call_bpf); | |
61 | ||
62 | static u64 bpf_probe_read(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5) | |
63 | { | |
64 | void *dst = (void *) (long) r1; | |
074f528e | 65 | int ret, size = (int) r2; |
2541517c AS |
66 | void *unsafe_ptr = (void *) (long) r3; |
67 | ||
074f528e DB |
68 | ret = probe_kernel_read(dst, unsafe_ptr, size); |
69 | if (unlikely(ret < 0)) | |
70 | memset(dst, 0, size); | |
71 | ||
72 | return ret; | |
2541517c AS |
73 | } |
74 | ||
75 | static const struct bpf_func_proto bpf_probe_read_proto = { | |
76 | .func = bpf_probe_read, | |
77 | .gpl_only = true, | |
78 | .ret_type = RET_INTEGER, | |
074f528e | 79 | .arg1_type = ARG_PTR_TO_RAW_STACK, |
2541517c AS |
80 | .arg2_type = ARG_CONST_STACK_SIZE, |
81 | .arg3_type = ARG_ANYTHING, | |
82 | }; | |
83 | ||
96ae5227 SD |
84 | static u64 bpf_probe_write_user(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5) |
85 | { | |
86 | void *unsafe_ptr = (void *) (long) r1; | |
87 | void *src = (void *) (long) r2; | |
88 | int size = (int) r3; | |
89 | ||
90 | /* | |
91 | * Ensure we're in user context which is safe for the helper to | |
92 | * run. This helper has no business in a kthread. | |
93 | * | |
94 | * access_ok() should prevent writing to non-user memory, but in | |
95 | * some situations (nommu, temporary switch, etc) access_ok() does | |
96 | * not provide enough validation, hence the check on KERNEL_DS. | |
97 | */ | |
98 | ||
99 | if (unlikely(in_interrupt() || | |
100 | current->flags & (PF_KTHREAD | PF_EXITING))) | |
101 | return -EPERM; | |
102 | if (unlikely(segment_eq(get_fs(), KERNEL_DS))) | |
103 | return -EPERM; | |
104 | if (!access_ok(VERIFY_WRITE, unsafe_ptr, size)) | |
105 | return -EPERM; | |
106 | ||
107 | return probe_kernel_write(unsafe_ptr, src, size); | |
108 | } | |
109 | ||
110 | static const struct bpf_func_proto bpf_probe_write_user_proto = { | |
111 | .func = bpf_probe_write_user, | |
112 | .gpl_only = true, | |
113 | .ret_type = RET_INTEGER, | |
114 | .arg1_type = ARG_ANYTHING, | |
115 | .arg2_type = ARG_PTR_TO_STACK, | |
116 | .arg3_type = ARG_CONST_STACK_SIZE, | |
117 | }; | |
118 | ||
119 | static const struct bpf_func_proto *bpf_get_probe_write_proto(void) | |
120 | { | |
121 | pr_warn_ratelimited("%s[%d] is installing a program with bpf_probe_write_user helper that may corrupt user memory!", | |
122 | current->comm, task_pid_nr(current)); | |
123 | ||
124 | return &bpf_probe_write_user_proto; | |
125 | } | |
126 | ||
9c959c86 AS |
127 | /* |
128 | * limited trace_printk() | |
8d3b7dce | 129 | * only %d %u %x %ld %lu %lx %lld %llu %llx %p %s conversion specifiers allowed |
9c959c86 AS |
130 | */ |
131 | static u64 bpf_trace_printk(u64 r1, u64 fmt_size, u64 r3, u64 r4, u64 r5) | |
132 | { | |
133 | char *fmt = (char *) (long) r1; | |
8d3b7dce | 134 | bool str_seen = false; |
9c959c86 AS |
135 | int mod[3] = {}; |
136 | int fmt_cnt = 0; | |
8d3b7dce AS |
137 | u64 unsafe_addr; |
138 | char buf[64]; | |
9c959c86 AS |
139 | int i; |
140 | ||
141 | /* | |
142 | * bpf_check()->check_func_arg()->check_stack_boundary() | |
143 | * guarantees that fmt points to bpf program stack, | |
144 | * fmt_size bytes of it were initialized and fmt_size > 0 | |
145 | */ | |
146 | if (fmt[--fmt_size] != 0) | |
147 | return -EINVAL; | |
148 | ||
149 | /* check format string for allowed specifiers */ | |
150 | for (i = 0; i < fmt_size; i++) { | |
151 | if ((!isprint(fmt[i]) && !isspace(fmt[i])) || !isascii(fmt[i])) | |
152 | return -EINVAL; | |
153 | ||
154 | if (fmt[i] != '%') | |
155 | continue; | |
156 | ||
157 | if (fmt_cnt >= 3) | |
158 | return -EINVAL; | |
159 | ||
160 | /* fmt[i] != 0 && fmt[last] == 0, so we can access fmt[i + 1] */ | |
161 | i++; | |
162 | if (fmt[i] == 'l') { | |
163 | mod[fmt_cnt]++; | |
164 | i++; | |
8d3b7dce | 165 | } else if (fmt[i] == 'p' || fmt[i] == 's') { |
9c959c86 AS |
166 | mod[fmt_cnt]++; |
167 | i++; | |
168 | if (!isspace(fmt[i]) && !ispunct(fmt[i]) && fmt[i] != 0) | |
169 | return -EINVAL; | |
170 | fmt_cnt++; | |
8d3b7dce AS |
171 | if (fmt[i - 1] == 's') { |
172 | if (str_seen) | |
173 | /* allow only one '%s' per fmt string */ | |
174 | return -EINVAL; | |
175 | str_seen = true; | |
176 | ||
177 | switch (fmt_cnt) { | |
178 | case 1: | |
179 | unsafe_addr = r3; | |
180 | r3 = (long) buf; | |
181 | break; | |
182 | case 2: | |
183 | unsafe_addr = r4; | |
184 | r4 = (long) buf; | |
185 | break; | |
186 | case 3: | |
187 | unsafe_addr = r5; | |
188 | r5 = (long) buf; | |
189 | break; | |
190 | } | |
191 | buf[0] = 0; | |
192 | strncpy_from_unsafe(buf, | |
193 | (void *) (long) unsafe_addr, | |
194 | sizeof(buf)); | |
195 | } | |
9c959c86 AS |
196 | continue; |
197 | } | |
198 | ||
199 | if (fmt[i] == 'l') { | |
200 | mod[fmt_cnt]++; | |
201 | i++; | |
202 | } | |
203 | ||
204 | if (fmt[i] != 'd' && fmt[i] != 'u' && fmt[i] != 'x') | |
205 | return -EINVAL; | |
206 | fmt_cnt++; | |
207 | } | |
208 | ||
209 | return __trace_printk(1/* fake ip will not be printed */, fmt, | |
210 | mod[0] == 2 ? r3 : mod[0] == 1 ? (long) r3 : (u32) r3, | |
211 | mod[1] == 2 ? r4 : mod[1] == 1 ? (long) r4 : (u32) r4, | |
212 | mod[2] == 2 ? r5 : mod[2] == 1 ? (long) r5 : (u32) r5); | |
213 | } | |
214 | ||
215 | static const struct bpf_func_proto bpf_trace_printk_proto = { | |
216 | .func = bpf_trace_printk, | |
217 | .gpl_only = true, | |
218 | .ret_type = RET_INTEGER, | |
219 | .arg1_type = ARG_PTR_TO_STACK, | |
220 | .arg2_type = ARG_CONST_STACK_SIZE, | |
221 | }; | |
222 | ||
0756ea3e AS |
223 | const struct bpf_func_proto *bpf_get_trace_printk_proto(void) |
224 | { | |
225 | /* | |
226 | * this program might be calling bpf_trace_printk, | |
227 | * so allocate per-cpu printk buffers | |
228 | */ | |
229 | trace_printk_init_buffers(); | |
230 | ||
231 | return &bpf_trace_printk_proto; | |
232 | } | |
233 | ||
6816a7ff | 234 | static u64 bpf_perf_event_read(u64 r1, u64 flags, u64 r3, u64 r4, u64 r5) |
35578d79 KX |
235 | { |
236 | struct bpf_map *map = (struct bpf_map *) (unsigned long) r1; | |
237 | struct bpf_array *array = container_of(map, struct bpf_array, map); | |
6816a7ff DB |
238 | unsigned int cpu = smp_processor_id(); |
239 | u64 index = flags & BPF_F_INDEX_MASK; | |
3b1efb19 | 240 | struct bpf_event_entry *ee; |
35578d79 KX |
241 | struct perf_event *event; |
242 | ||
6816a7ff DB |
243 | if (unlikely(flags & ~(BPF_F_INDEX_MASK))) |
244 | return -EINVAL; | |
245 | if (index == BPF_F_CURRENT_CPU) | |
246 | index = cpu; | |
35578d79 KX |
247 | if (unlikely(index >= array->map.max_entries)) |
248 | return -E2BIG; | |
249 | ||
3b1efb19 | 250 | ee = READ_ONCE(array->ptrs[index]); |
1ca1cc98 | 251 | if (!ee) |
35578d79 KX |
252 | return -ENOENT; |
253 | ||
3b1efb19 | 254 | event = ee->event; |
1ca1cc98 DB |
255 | if (unlikely(event->attr.type != PERF_TYPE_HARDWARE && |
256 | event->attr.type != PERF_TYPE_RAW)) | |
257 | return -EINVAL; | |
258 | ||
62544ce8 | 259 | /* make sure event is local and doesn't have pmu::count */ |
6816a7ff | 260 | if (unlikely(event->oncpu != cpu || event->pmu->count)) |
62544ce8 AS |
261 | return -EINVAL; |
262 | ||
35578d79 KX |
263 | /* |
264 | * we don't know if the function is run successfully by the | |
265 | * return value. It can be judged in other places, such as | |
266 | * eBPF programs. | |
267 | */ | |
268 | return perf_event_read_local(event); | |
269 | } | |
270 | ||
62544ce8 | 271 | static const struct bpf_func_proto bpf_perf_event_read_proto = { |
35578d79 | 272 | .func = bpf_perf_event_read, |
1075ef59 | 273 | .gpl_only = true, |
35578d79 KX |
274 | .ret_type = RET_INTEGER, |
275 | .arg1_type = ARG_CONST_MAP_PTR, | |
276 | .arg2_type = ARG_ANYTHING, | |
277 | }; | |
278 | ||
8e7a3920 DB |
279 | static __always_inline u64 |
280 | __bpf_perf_event_output(struct pt_regs *regs, struct bpf_map *map, | |
281 | u64 flags, struct perf_raw_record *raw) | |
a43eec30 | 282 | { |
a43eec30 | 283 | struct bpf_array *array = container_of(map, struct bpf_array, map); |
d7931330 | 284 | unsigned int cpu = smp_processor_id(); |
1e33759c | 285 | u64 index = flags & BPF_F_INDEX_MASK; |
a43eec30 | 286 | struct perf_sample_data sample_data; |
3b1efb19 | 287 | struct bpf_event_entry *ee; |
a43eec30 | 288 | struct perf_event *event; |
a43eec30 | 289 | |
1e33759c | 290 | if (index == BPF_F_CURRENT_CPU) |
d7931330 | 291 | index = cpu; |
a43eec30 AS |
292 | if (unlikely(index >= array->map.max_entries)) |
293 | return -E2BIG; | |
294 | ||
3b1efb19 | 295 | ee = READ_ONCE(array->ptrs[index]); |
1ca1cc98 | 296 | if (!ee) |
a43eec30 AS |
297 | return -ENOENT; |
298 | ||
3b1efb19 | 299 | event = ee->event; |
a43eec30 AS |
300 | if (unlikely(event->attr.type != PERF_TYPE_SOFTWARE || |
301 | event->attr.config != PERF_COUNT_SW_BPF_OUTPUT)) | |
302 | return -EINVAL; | |
303 | ||
d7931330 | 304 | if (unlikely(event->oncpu != cpu)) |
a43eec30 AS |
305 | return -EOPNOTSUPP; |
306 | ||
307 | perf_sample_data_init(&sample_data, 0, 0); | |
8e7a3920 | 308 | sample_data.raw = raw; |
a43eec30 AS |
309 | perf_event_output(event, &sample_data, regs); |
310 | return 0; | |
311 | } | |
312 | ||
8e7a3920 DB |
313 | static u64 bpf_perf_event_output(u64 r1, u64 r2, u64 flags, u64 r4, u64 size) |
314 | { | |
315 | struct pt_regs *regs = (struct pt_regs *)(long) r1; | |
316 | struct bpf_map *map = (struct bpf_map *)(long) r2; | |
317 | void *data = (void *)(long) r4; | |
318 | struct perf_raw_record raw = { | |
319 | .frag = { | |
320 | .size = size, | |
321 | .data = data, | |
322 | }, | |
323 | }; | |
324 | ||
325 | if (unlikely(flags & ~(BPF_F_INDEX_MASK))) | |
326 | return -EINVAL; | |
327 | ||
328 | return __bpf_perf_event_output(regs, map, flags, &raw); | |
329 | } | |
330 | ||
a43eec30 AS |
331 | static const struct bpf_func_proto bpf_perf_event_output_proto = { |
332 | .func = bpf_perf_event_output, | |
1075ef59 | 333 | .gpl_only = true, |
a43eec30 AS |
334 | .ret_type = RET_INTEGER, |
335 | .arg1_type = ARG_PTR_TO_CTX, | |
336 | .arg2_type = ARG_CONST_MAP_PTR, | |
337 | .arg3_type = ARG_ANYTHING, | |
338 | .arg4_type = ARG_PTR_TO_STACK, | |
339 | .arg5_type = ARG_CONST_STACK_SIZE, | |
340 | }; | |
341 | ||
bd570ff9 DB |
342 | static DEFINE_PER_CPU(struct pt_regs, bpf_pt_regs); |
343 | ||
555c8a86 DB |
344 | u64 bpf_event_output(struct bpf_map *map, u64 flags, void *meta, u64 meta_size, |
345 | void *ctx, u64 ctx_size, bpf_ctx_copy_t ctx_copy) | |
bd570ff9 DB |
346 | { |
347 | struct pt_regs *regs = this_cpu_ptr(&bpf_pt_regs); | |
555c8a86 DB |
348 | struct perf_raw_frag frag = { |
349 | .copy = ctx_copy, | |
350 | .size = ctx_size, | |
351 | .data = ctx, | |
352 | }; | |
353 | struct perf_raw_record raw = { | |
354 | .frag = { | |
183fc153 AM |
355 | { |
356 | .next = ctx_size ? &frag : NULL, | |
357 | }, | |
555c8a86 DB |
358 | .size = meta_size, |
359 | .data = meta, | |
360 | }, | |
361 | }; | |
bd570ff9 DB |
362 | |
363 | perf_fetch_caller_regs(regs); | |
364 | ||
555c8a86 | 365 | return __bpf_perf_event_output(regs, map, flags, &raw); |
bd570ff9 DB |
366 | } |
367 | ||
606274c5 AS |
368 | static u64 bpf_get_current_task(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5) |
369 | { | |
370 | return (long) current; | |
371 | } | |
372 | ||
373 | static const struct bpf_func_proto bpf_get_current_task_proto = { | |
374 | .func = bpf_get_current_task, | |
375 | .gpl_only = true, | |
376 | .ret_type = RET_INTEGER, | |
377 | }; | |
378 | ||
9fd82b61 | 379 | static const struct bpf_func_proto *tracing_func_proto(enum bpf_func_id func_id) |
2541517c AS |
380 | { |
381 | switch (func_id) { | |
382 | case BPF_FUNC_map_lookup_elem: | |
383 | return &bpf_map_lookup_elem_proto; | |
384 | case BPF_FUNC_map_update_elem: | |
385 | return &bpf_map_update_elem_proto; | |
386 | case BPF_FUNC_map_delete_elem: | |
387 | return &bpf_map_delete_elem_proto; | |
388 | case BPF_FUNC_probe_read: | |
389 | return &bpf_probe_read_proto; | |
d9847d31 AS |
390 | case BPF_FUNC_ktime_get_ns: |
391 | return &bpf_ktime_get_ns_proto; | |
04fd61ab AS |
392 | case BPF_FUNC_tail_call: |
393 | return &bpf_tail_call_proto; | |
ffeedafb AS |
394 | case BPF_FUNC_get_current_pid_tgid: |
395 | return &bpf_get_current_pid_tgid_proto; | |
606274c5 AS |
396 | case BPF_FUNC_get_current_task: |
397 | return &bpf_get_current_task_proto; | |
ffeedafb AS |
398 | case BPF_FUNC_get_current_uid_gid: |
399 | return &bpf_get_current_uid_gid_proto; | |
400 | case BPF_FUNC_get_current_comm: | |
401 | return &bpf_get_current_comm_proto; | |
9c959c86 | 402 | case BPF_FUNC_trace_printk: |
0756ea3e | 403 | return bpf_get_trace_printk_proto(); |
ab1973d3 AS |
404 | case BPF_FUNC_get_smp_processor_id: |
405 | return &bpf_get_smp_processor_id_proto; | |
35578d79 KX |
406 | case BPF_FUNC_perf_event_read: |
407 | return &bpf_perf_event_read_proto; | |
96ae5227 SD |
408 | case BPF_FUNC_probe_write_user: |
409 | return bpf_get_probe_write_proto(); | |
9fd82b61 AS |
410 | default: |
411 | return NULL; | |
412 | } | |
413 | } | |
414 | ||
415 | static const struct bpf_func_proto *kprobe_prog_func_proto(enum bpf_func_id func_id) | |
416 | { | |
417 | switch (func_id) { | |
a43eec30 AS |
418 | case BPF_FUNC_perf_event_output: |
419 | return &bpf_perf_event_output_proto; | |
d5a3b1f6 AS |
420 | case BPF_FUNC_get_stackid: |
421 | return &bpf_get_stackid_proto; | |
2541517c | 422 | default: |
9fd82b61 | 423 | return tracing_func_proto(func_id); |
2541517c AS |
424 | } |
425 | } | |
426 | ||
427 | /* bpf+kprobe programs can access fields of 'struct pt_regs' */ | |
19de99f7 AS |
428 | static bool kprobe_prog_is_valid_access(int off, int size, enum bpf_access_type type, |
429 | enum bpf_reg_type *reg_type) | |
2541517c | 430 | { |
2541517c AS |
431 | if (off < 0 || off >= sizeof(struct pt_regs)) |
432 | return false; | |
2541517c AS |
433 | if (type != BPF_READ) |
434 | return false; | |
2541517c AS |
435 | if (off % size != 0) |
436 | return false; | |
2541517c AS |
437 | return true; |
438 | } | |
439 | ||
27dff4e0 | 440 | static const struct bpf_verifier_ops kprobe_prog_ops = { |
2541517c AS |
441 | .get_func_proto = kprobe_prog_func_proto, |
442 | .is_valid_access = kprobe_prog_is_valid_access, | |
443 | }; | |
444 | ||
445 | static struct bpf_prog_type_list kprobe_tl = { | |
446 | .ops = &kprobe_prog_ops, | |
447 | .type = BPF_PROG_TYPE_KPROBE, | |
448 | }; | |
449 | ||
9940d67c AS |
450 | static u64 bpf_perf_event_output_tp(u64 r1, u64 r2, u64 index, u64 r4, u64 size) |
451 | { | |
452 | /* | |
453 | * r1 points to perf tracepoint buffer where first 8 bytes are hidden | |
454 | * from bpf program and contain a pointer to 'struct pt_regs'. Fetch it | |
455 | * from there and call the same bpf_perf_event_output() helper | |
456 | */ | |
266a0a79 | 457 | u64 ctx = *(long *)(uintptr_t)r1; |
9940d67c AS |
458 | |
459 | return bpf_perf_event_output(ctx, r2, index, r4, size); | |
460 | } | |
461 | ||
462 | static const struct bpf_func_proto bpf_perf_event_output_proto_tp = { | |
463 | .func = bpf_perf_event_output_tp, | |
464 | .gpl_only = true, | |
465 | .ret_type = RET_INTEGER, | |
466 | .arg1_type = ARG_PTR_TO_CTX, | |
467 | .arg2_type = ARG_CONST_MAP_PTR, | |
468 | .arg3_type = ARG_ANYTHING, | |
469 | .arg4_type = ARG_PTR_TO_STACK, | |
470 | .arg5_type = ARG_CONST_STACK_SIZE, | |
471 | }; | |
472 | ||
473 | static u64 bpf_get_stackid_tp(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5) | |
474 | { | |
266a0a79 | 475 | u64 ctx = *(long *)(uintptr_t)r1; |
9940d67c AS |
476 | |
477 | return bpf_get_stackid(ctx, r2, r3, r4, r5); | |
478 | } | |
479 | ||
480 | static const struct bpf_func_proto bpf_get_stackid_proto_tp = { | |
481 | .func = bpf_get_stackid_tp, | |
482 | .gpl_only = true, | |
483 | .ret_type = RET_INTEGER, | |
484 | .arg1_type = ARG_PTR_TO_CTX, | |
485 | .arg2_type = ARG_CONST_MAP_PTR, | |
486 | .arg3_type = ARG_ANYTHING, | |
487 | }; | |
488 | ||
9fd82b61 AS |
489 | static const struct bpf_func_proto *tp_prog_func_proto(enum bpf_func_id func_id) |
490 | { | |
491 | switch (func_id) { | |
492 | case BPF_FUNC_perf_event_output: | |
9940d67c | 493 | return &bpf_perf_event_output_proto_tp; |
9fd82b61 | 494 | case BPF_FUNC_get_stackid: |
9940d67c | 495 | return &bpf_get_stackid_proto_tp; |
9fd82b61 AS |
496 | default: |
497 | return tracing_func_proto(func_id); | |
498 | } | |
499 | } | |
500 | ||
19de99f7 AS |
501 | static bool tp_prog_is_valid_access(int off, int size, enum bpf_access_type type, |
502 | enum bpf_reg_type *reg_type) | |
9fd82b61 AS |
503 | { |
504 | if (off < sizeof(void *) || off >= PERF_MAX_TRACE_SIZE) | |
505 | return false; | |
506 | if (type != BPF_READ) | |
507 | return false; | |
508 | if (off % size != 0) | |
509 | return false; | |
510 | return true; | |
511 | } | |
512 | ||
513 | static const struct bpf_verifier_ops tracepoint_prog_ops = { | |
514 | .get_func_proto = tp_prog_func_proto, | |
515 | .is_valid_access = tp_prog_is_valid_access, | |
516 | }; | |
517 | ||
518 | static struct bpf_prog_type_list tracepoint_tl = { | |
519 | .ops = &tracepoint_prog_ops, | |
520 | .type = BPF_PROG_TYPE_TRACEPOINT, | |
521 | }; | |
522 | ||
2541517c AS |
523 | static int __init register_kprobe_prog_ops(void) |
524 | { | |
525 | bpf_register_prog_type(&kprobe_tl); | |
9fd82b61 | 526 | bpf_register_prog_type(&tracepoint_tl); |
2541517c AS |
527 | return 0; |
528 | } | |
529 | late_initcall(register_kprobe_prog_ops); |