1 // SPDX-License-Identifier: GPL-2.0
2 /* Copyright (c) 2011-2015 PLUMgrid, http://plumgrid.com
3 * Copyright (c) 2016 Facebook
5 #include <linux/kernel.h>
6 #include <linux/types.h>
7 #include <linux/slab.h>
9 #include <linux/bpf_perf_event.h>
10 #include <linux/filter.h>
11 #include <linux/uaccess.h>
12 #include <linux/ctype.h>
13 #include <linux/kprobes.h>
14 #include <linux/syscalls.h>
15 #include <linux/error-injection.h>
19 #include "trace_probe.h"
22 #define bpf_event_rcu_dereference(p) \
23 rcu_dereference_protected(p, lockdep_is_held(&bpf_event_mutex))
26 struct bpf_trace_module {
27 struct module *module;
28 struct list_head list;
31 static LIST_HEAD(bpf_trace_modules);
32 static DEFINE_MUTEX(bpf_module_mutex);
34 static struct bpf_raw_event_map *bpf_get_raw_tracepoint_module(const char *name)
36 struct bpf_raw_event_map *btp, *ret = NULL;
37 struct bpf_trace_module *btm;
40 mutex_lock(&bpf_module_mutex);
41 list_for_each_entry(btm, &bpf_trace_modules, list) {
42 for (i = 0; i < btm->module->num_bpf_raw_events; ++i) {
43 btp = &btm->module->bpf_raw_events[i];
44 if (!strcmp(btp->tp->name, name)) {
45 if (try_module_get(btm->module))
52 mutex_unlock(&bpf_module_mutex);
56 static struct bpf_raw_event_map *bpf_get_raw_tracepoint_module(const char *name)
60 #endif /* CONFIG_MODULES */
62 u64 bpf_get_stackid(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5);
63 u64 bpf_get_stack(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5);
66 * trace_call_bpf - invoke BPF program
67 * @call: tracepoint event
68 * @ctx: opaque context pointer
70 * kprobe handlers execute BPF programs via this helper.
71 * Can be used from static tracepoints in the future.
73 * Return: BPF programs always return an integer which is interpreted by
75 * 0 - return from kprobe (event is filtered out)
76 * 1 - store kprobe event into ring buffer
77 * Other values are reserved and currently alias to 1
79 unsigned int trace_call_bpf(struct trace_event_call *call, void *ctx)
83 if (in_nmi()) /* not supported yet */
88 if (unlikely(__this_cpu_inc_return(bpf_prog_active) != 1)) {
90 * since some bpf program is already running on this cpu,
91 * don't call into another bpf program (same or different)
92 * and don't send kprobe event into ring-buffer,
100 * Instead of moving rcu_read_lock/rcu_dereference/rcu_read_unlock
101 * to all call sites, we did a bpf_prog_array_valid() there to check
102 * whether call->prog_array is empty or not, which is
103 * a heurisitc to speed up execution.
105 * If bpf_prog_array_valid() fetched prog_array was
106 * non-NULL, we go into trace_call_bpf() and do the actual
107 * proper rcu_dereference() under RCU lock.
108 * If it turns out that prog_array is NULL then, we bail out.
109 * For the opposite, if the bpf_prog_array_valid() fetched pointer
110 * was NULL, you'll skip the prog_array with the risk of missing
111 * out of events when it was updated in between this and the
112 * rcu_dereference() which is accepted risk.
114 ret = BPF_PROG_RUN_ARRAY_CHECK(call->prog_array, ctx, BPF_PROG_RUN);
117 __this_cpu_dec(bpf_prog_active);
122 #ifdef CONFIG_BPF_KPROBE_OVERRIDE
123 BPF_CALL_2(bpf_override_return, struct pt_regs *, regs, unsigned long, rc)
125 regs_set_return_value(regs, rc);
126 override_function_with_return(regs);
130 static const struct bpf_func_proto bpf_override_return_proto = {
131 .func = bpf_override_return,
133 .ret_type = RET_INTEGER,
134 .arg1_type = ARG_PTR_TO_CTX,
135 .arg2_type = ARG_ANYTHING,
139 BPF_CALL_3(bpf_probe_read_user, void *, dst, u32, size,
140 const void __user *, unsafe_ptr)
142 int ret = probe_user_read(dst, unsafe_ptr, size);
144 if (unlikely(ret < 0))
145 memset(dst, 0, size);
150 static const struct bpf_func_proto bpf_probe_read_user_proto = {
151 .func = bpf_probe_read_user,
153 .ret_type = RET_INTEGER,
154 .arg1_type = ARG_PTR_TO_UNINIT_MEM,
155 .arg2_type = ARG_CONST_SIZE_OR_ZERO,
156 .arg3_type = ARG_ANYTHING,
159 BPF_CALL_3(bpf_probe_read_user_str, void *, dst, u32, size,
160 const void __user *, unsafe_ptr)
162 int ret = strncpy_from_unsafe_user(dst, unsafe_ptr, size);
164 if (unlikely(ret < 0))
165 memset(dst, 0, size);
170 static const struct bpf_func_proto bpf_probe_read_user_str_proto = {
171 .func = bpf_probe_read_user_str,
173 .ret_type = RET_INTEGER,
174 .arg1_type = ARG_PTR_TO_UNINIT_MEM,
175 .arg2_type = ARG_CONST_SIZE_OR_ZERO,
176 .arg3_type = ARG_ANYTHING,
179 static __always_inline int
180 bpf_probe_read_kernel_common(void *dst, u32 size, const void *unsafe_ptr,
183 int ret = security_locked_down(LOCKDOWN_BPF_READ);
185 if (unlikely(ret < 0))
187 ret = compat ? probe_kernel_read(dst, unsafe_ptr, size) :
188 probe_kernel_read_strict(dst, unsafe_ptr, size);
189 if (unlikely(ret < 0))
191 memset(dst, 0, size);
195 BPF_CALL_3(bpf_probe_read_kernel, void *, dst, u32, size,
196 const void *, unsafe_ptr)
198 return bpf_probe_read_kernel_common(dst, size, unsafe_ptr, false);
201 static const struct bpf_func_proto bpf_probe_read_kernel_proto = {
202 .func = bpf_probe_read_kernel,
204 .ret_type = RET_INTEGER,
205 .arg1_type = ARG_PTR_TO_UNINIT_MEM,
206 .arg2_type = ARG_CONST_SIZE_OR_ZERO,
207 .arg3_type = ARG_ANYTHING,
210 BPF_CALL_3(bpf_probe_read_compat, void *, dst, u32, size,
211 const void *, unsafe_ptr)
213 return bpf_probe_read_kernel_common(dst, size, unsafe_ptr, true);
216 static const struct bpf_func_proto bpf_probe_read_compat_proto = {
217 .func = bpf_probe_read_compat,
219 .ret_type = RET_INTEGER,
220 .arg1_type = ARG_PTR_TO_UNINIT_MEM,
221 .arg2_type = ARG_CONST_SIZE_OR_ZERO,
222 .arg3_type = ARG_ANYTHING,
225 static __always_inline int
226 bpf_probe_read_kernel_str_common(void *dst, u32 size, const void *unsafe_ptr,
229 int ret = security_locked_down(LOCKDOWN_BPF_READ);
231 if (unlikely(ret < 0))
234 * The strncpy_from_unsafe_*() call will likely not fill the entire
235 * buffer, but that's okay in this circumstance as we're probing
236 * arbitrary memory anyway similar to bpf_probe_read_*() and might
237 * as well probe the stack. Thus, memory is explicitly cleared
238 * only in error case, so that improper users ignoring return
239 * code altogether don't copy garbage; otherwise length of string
240 * is returned that can be used for bpf_perf_event_output() et al.
242 ret = compat ? strncpy_from_unsafe(dst, unsafe_ptr, size) :
243 strncpy_from_unsafe_strict(dst, unsafe_ptr, size);
244 if (unlikely(ret < 0))
246 memset(dst, 0, size);
250 BPF_CALL_3(bpf_probe_read_kernel_str, void *, dst, u32, size,
251 const void *, unsafe_ptr)
253 return bpf_probe_read_kernel_str_common(dst, size, unsafe_ptr, false);
256 static const struct bpf_func_proto bpf_probe_read_kernel_str_proto = {
257 .func = bpf_probe_read_kernel_str,
259 .ret_type = RET_INTEGER,
260 .arg1_type = ARG_PTR_TO_UNINIT_MEM,
261 .arg2_type = ARG_CONST_SIZE_OR_ZERO,
262 .arg3_type = ARG_ANYTHING,
265 BPF_CALL_3(bpf_probe_read_compat_str, void *, dst, u32, size,
266 const void *, unsafe_ptr)
268 return bpf_probe_read_kernel_str_common(dst, size, unsafe_ptr, true);
271 static const struct bpf_func_proto bpf_probe_read_compat_str_proto = {
272 .func = bpf_probe_read_compat_str,
274 .ret_type = RET_INTEGER,
275 .arg1_type = ARG_PTR_TO_UNINIT_MEM,
276 .arg2_type = ARG_CONST_SIZE_OR_ZERO,
277 .arg3_type = ARG_ANYTHING,
280 BPF_CALL_3(bpf_probe_write_user, void __user *, unsafe_ptr, const void *, src,
284 * Ensure we're in user context which is safe for the helper to
285 * run. This helper has no business in a kthread.
287 * access_ok() should prevent writing to non-user memory, but in
288 * some situations (nommu, temporary switch, etc) access_ok() does
289 * not provide enough validation, hence the check on KERNEL_DS.
291 * nmi_uaccess_okay() ensures the probe is not run in an interim
292 * state, when the task or mm are switched. This is specifically
293 * required to prevent the use of temporary mm.
296 if (unlikely(in_interrupt() ||
297 current->flags & (PF_KTHREAD | PF_EXITING)))
299 if (unlikely(uaccess_kernel()))
301 if (unlikely(!nmi_uaccess_okay()))
304 return probe_user_write(unsafe_ptr, src, size);
307 static const struct bpf_func_proto bpf_probe_write_user_proto = {
308 .func = bpf_probe_write_user,
310 .ret_type = RET_INTEGER,
311 .arg1_type = ARG_ANYTHING,
312 .arg2_type = ARG_PTR_TO_MEM,
313 .arg3_type = ARG_CONST_SIZE,
316 static const struct bpf_func_proto *bpf_get_probe_write_proto(void)
318 pr_warn_ratelimited("%s[%d] is installing a program with bpf_probe_write_user helper that may corrupt user memory!",
319 current->comm, task_pid_nr(current));
321 return &bpf_probe_write_user_proto;
325 * Only limited trace_printk() conversion specifiers allowed:
326 * %d %i %u %x %ld %li %lu %lx %lld %lli %llu %llx %p %s
328 BPF_CALL_5(bpf_trace_printk, char *, fmt, u32, fmt_size, u64, arg1,
329 u64, arg2, u64, arg3)
331 bool str_seen = false;
339 * bpf_check()->check_func_arg()->check_stack_boundary()
340 * guarantees that fmt points to bpf program stack,
341 * fmt_size bytes of it were initialized and fmt_size > 0
343 if (fmt[--fmt_size] != 0)
346 /* check format string for allowed specifiers */
347 for (i = 0; i < fmt_size; i++) {
348 if ((!isprint(fmt[i]) && !isspace(fmt[i])) || !isascii(fmt[i]))
357 /* fmt[i] != 0 && fmt[last] == 0, so we can access fmt[i + 1] */
362 } else if (fmt[i] == 'p' || fmt[i] == 's') {
364 /* disallow any further format extensions */
365 if (fmt[i + 1] != 0 &&
366 !isspace(fmt[i + 1]) &&
367 !ispunct(fmt[i + 1]))
372 /* allow only one '%s' per fmt string */
391 strncpy_from_unsafe(buf,
392 (void *) (long) unsafe_addr,
403 if (fmt[i] != 'i' && fmt[i] != 'd' &&
404 fmt[i] != 'u' && fmt[i] != 'x')
409 /* Horrid workaround for getting va_list handling working with different
410 * argument type combinations generically for 32 and 64 bit archs.
412 #define __BPF_TP_EMIT() __BPF_ARG3_TP()
413 #define __BPF_TP(...) \
414 __trace_printk(0 /* Fake ip */, \
417 #define __BPF_ARG1_TP(...) \
418 ((mod[0] == 2 || (mod[0] == 1 && __BITS_PER_LONG == 64)) \
419 ? __BPF_TP(arg1, ##__VA_ARGS__) \
420 : ((mod[0] == 1 || (mod[0] == 0 && __BITS_PER_LONG == 32)) \
421 ? __BPF_TP((long)arg1, ##__VA_ARGS__) \
422 : __BPF_TP((u32)arg1, ##__VA_ARGS__)))
424 #define __BPF_ARG2_TP(...) \
425 ((mod[1] == 2 || (mod[1] == 1 && __BITS_PER_LONG == 64)) \
426 ? __BPF_ARG1_TP(arg2, ##__VA_ARGS__) \
427 : ((mod[1] == 1 || (mod[1] == 0 && __BITS_PER_LONG == 32)) \
428 ? __BPF_ARG1_TP((long)arg2, ##__VA_ARGS__) \
429 : __BPF_ARG1_TP((u32)arg2, ##__VA_ARGS__)))
431 #define __BPF_ARG3_TP(...) \
432 ((mod[2] == 2 || (mod[2] == 1 && __BITS_PER_LONG == 64)) \
433 ? __BPF_ARG2_TP(arg3, ##__VA_ARGS__) \
434 : ((mod[2] == 1 || (mod[2] == 0 && __BITS_PER_LONG == 32)) \
435 ? __BPF_ARG2_TP((long)arg3, ##__VA_ARGS__) \
436 : __BPF_ARG2_TP((u32)arg3, ##__VA_ARGS__)))
438 return __BPF_TP_EMIT();
441 static const struct bpf_func_proto bpf_trace_printk_proto = {
442 .func = bpf_trace_printk,
444 .ret_type = RET_INTEGER,
445 .arg1_type = ARG_PTR_TO_MEM,
446 .arg2_type = ARG_CONST_SIZE,
449 const struct bpf_func_proto *bpf_get_trace_printk_proto(void)
452 * this program might be calling bpf_trace_printk,
453 * so allocate per-cpu printk buffers
455 trace_printk_init_buffers();
457 return &bpf_trace_printk_proto;
460 static __always_inline int
461 get_map_perf_counter(struct bpf_map *map, u64 flags,
462 u64 *value, u64 *enabled, u64 *running)
464 struct bpf_array *array = container_of(map, struct bpf_array, map);
465 unsigned int cpu = smp_processor_id();
466 u64 index = flags & BPF_F_INDEX_MASK;
467 struct bpf_event_entry *ee;
469 if (unlikely(flags & ~(BPF_F_INDEX_MASK)))
471 if (index == BPF_F_CURRENT_CPU)
473 if (unlikely(index >= array->map.max_entries))
476 ee = READ_ONCE(array->ptrs[index]);
480 return perf_event_read_local(ee->event, value, enabled, running);
483 BPF_CALL_2(bpf_perf_event_read, struct bpf_map *, map, u64, flags)
488 err = get_map_perf_counter(map, flags, &value, NULL, NULL);
490 * this api is ugly since we miss [-22..-2] range of valid
491 * counter values, but that's uapi
498 static const struct bpf_func_proto bpf_perf_event_read_proto = {
499 .func = bpf_perf_event_read,
501 .ret_type = RET_INTEGER,
502 .arg1_type = ARG_CONST_MAP_PTR,
503 .arg2_type = ARG_ANYTHING,
506 BPF_CALL_4(bpf_perf_event_read_value, struct bpf_map *, map, u64, flags,
507 struct bpf_perf_event_value *, buf, u32, size)
511 if (unlikely(size != sizeof(struct bpf_perf_event_value)))
513 err = get_map_perf_counter(map, flags, &buf->counter, &buf->enabled,
519 memset(buf, 0, size);
523 static const struct bpf_func_proto bpf_perf_event_read_value_proto = {
524 .func = bpf_perf_event_read_value,
526 .ret_type = RET_INTEGER,
527 .arg1_type = ARG_CONST_MAP_PTR,
528 .arg2_type = ARG_ANYTHING,
529 .arg3_type = ARG_PTR_TO_UNINIT_MEM,
530 .arg4_type = ARG_CONST_SIZE,
533 static __always_inline u64
534 __bpf_perf_event_output(struct pt_regs *regs, struct bpf_map *map,
535 u64 flags, struct perf_sample_data *sd)
537 struct bpf_array *array = container_of(map, struct bpf_array, map);
538 unsigned int cpu = smp_processor_id();
539 u64 index = flags & BPF_F_INDEX_MASK;
540 struct bpf_event_entry *ee;
541 struct perf_event *event;
543 if (index == BPF_F_CURRENT_CPU)
545 if (unlikely(index >= array->map.max_entries))
548 ee = READ_ONCE(array->ptrs[index]);
553 if (unlikely(event->attr.type != PERF_TYPE_SOFTWARE ||
554 event->attr.config != PERF_COUNT_SW_BPF_OUTPUT))
557 if (unlikely(event->oncpu != cpu))
560 return perf_event_output(event, sd, regs);
564 * Support executing tracepoints in normal, irq, and nmi context that each call
565 * bpf_perf_event_output
567 struct bpf_trace_sample_data {
568 struct perf_sample_data sds[3];
571 static DEFINE_PER_CPU(struct bpf_trace_sample_data, bpf_trace_sds);
572 static DEFINE_PER_CPU(int, bpf_trace_nest_level);
573 BPF_CALL_5(bpf_perf_event_output, struct pt_regs *, regs, struct bpf_map *, map,
574 u64, flags, void *, data, u64, size)
576 struct bpf_trace_sample_data *sds = this_cpu_ptr(&bpf_trace_sds);
577 int nest_level = this_cpu_inc_return(bpf_trace_nest_level);
578 struct perf_raw_record raw = {
584 struct perf_sample_data *sd;
587 if (WARN_ON_ONCE(nest_level > ARRAY_SIZE(sds->sds))) {
592 sd = &sds->sds[nest_level - 1];
594 if (unlikely(flags & ~(BPF_F_INDEX_MASK))) {
599 perf_sample_data_init(sd, 0, 0);
602 err = __bpf_perf_event_output(regs, map, flags, sd);
605 this_cpu_dec(bpf_trace_nest_level);
609 static const struct bpf_func_proto bpf_perf_event_output_proto = {
610 .func = bpf_perf_event_output,
612 .ret_type = RET_INTEGER,
613 .arg1_type = ARG_PTR_TO_CTX,
614 .arg2_type = ARG_CONST_MAP_PTR,
615 .arg3_type = ARG_ANYTHING,
616 .arg4_type = ARG_PTR_TO_MEM,
617 .arg5_type = ARG_CONST_SIZE_OR_ZERO,
620 static DEFINE_PER_CPU(int, bpf_event_output_nest_level);
621 struct bpf_nested_pt_regs {
622 struct pt_regs regs[3];
624 static DEFINE_PER_CPU(struct bpf_nested_pt_regs, bpf_pt_regs);
625 static DEFINE_PER_CPU(struct bpf_trace_sample_data, bpf_misc_sds);
627 u64 bpf_event_output(struct bpf_map *map, u64 flags, void *meta, u64 meta_size,
628 void *ctx, u64 ctx_size, bpf_ctx_copy_t ctx_copy)
630 int nest_level = this_cpu_inc_return(bpf_event_output_nest_level);
631 struct perf_raw_frag frag = {
636 struct perf_raw_record raw = {
639 .next = ctx_size ? &frag : NULL,
645 struct perf_sample_data *sd;
646 struct pt_regs *regs;
649 if (WARN_ON_ONCE(nest_level > ARRAY_SIZE(bpf_misc_sds.sds))) {
653 sd = this_cpu_ptr(&bpf_misc_sds.sds[nest_level - 1]);
654 regs = this_cpu_ptr(&bpf_pt_regs.regs[nest_level - 1]);
656 perf_fetch_caller_regs(regs);
657 perf_sample_data_init(sd, 0, 0);
660 ret = __bpf_perf_event_output(regs, map, flags, sd);
662 this_cpu_dec(bpf_event_output_nest_level);
666 BPF_CALL_0(bpf_get_current_task)
668 return (long) current;
671 static const struct bpf_func_proto bpf_get_current_task_proto = {
672 .func = bpf_get_current_task,
674 .ret_type = RET_INTEGER,
677 BPF_CALL_2(bpf_current_task_under_cgroup, struct bpf_map *, map, u32, idx)
679 struct bpf_array *array = container_of(map, struct bpf_array, map);
682 if (unlikely(idx >= array->map.max_entries))
685 cgrp = READ_ONCE(array->ptrs[idx]);
689 return task_under_cgroup_hierarchy(current, cgrp);
692 static const struct bpf_func_proto bpf_current_task_under_cgroup_proto = {
693 .func = bpf_current_task_under_cgroup,
695 .ret_type = RET_INTEGER,
696 .arg1_type = ARG_CONST_MAP_PTR,
697 .arg2_type = ARG_ANYTHING,
700 struct send_signal_irq_work {
701 struct irq_work irq_work;
702 struct task_struct *task;
707 static DEFINE_PER_CPU(struct send_signal_irq_work, send_signal_work);
709 static void do_bpf_send_signal(struct irq_work *entry)
711 struct send_signal_irq_work *work;
713 work = container_of(entry, struct send_signal_irq_work, irq_work);
714 group_send_sig_info(work->sig, SEND_SIG_PRIV, work->task, work->type);
717 static int bpf_send_signal_common(u32 sig, enum pid_type type)
719 struct send_signal_irq_work *work = NULL;
721 /* Similar to bpf_probe_write_user, task needs to be
722 * in a sound condition and kernel memory access be
723 * permitted in order to send signal to the current
726 if (unlikely(current->flags & (PF_KTHREAD | PF_EXITING)))
728 if (unlikely(uaccess_kernel()))
730 if (unlikely(!nmi_uaccess_okay()))
733 if (irqs_disabled()) {
734 /* Do an early check on signal validity. Otherwise,
735 * the error is lost in deferred irq_work.
737 if (unlikely(!valid_signal(sig)))
740 work = this_cpu_ptr(&send_signal_work);
741 if (atomic_read(&work->irq_work.flags) & IRQ_WORK_BUSY)
744 /* Add the current task, which is the target of sending signal,
745 * to the irq_work. The current task may change when queued
746 * irq works get executed.
748 work->task = current;
751 irq_work_queue(&work->irq_work);
755 return group_send_sig_info(sig, SEND_SIG_PRIV, current, type);
758 BPF_CALL_1(bpf_send_signal, u32, sig)
760 return bpf_send_signal_common(sig, PIDTYPE_TGID);
763 static const struct bpf_func_proto bpf_send_signal_proto = {
764 .func = bpf_send_signal,
766 .ret_type = RET_INTEGER,
767 .arg1_type = ARG_ANYTHING,
770 BPF_CALL_1(bpf_send_signal_thread, u32, sig)
772 return bpf_send_signal_common(sig, PIDTYPE_PID);
775 static const struct bpf_func_proto bpf_send_signal_thread_proto = {
776 .func = bpf_send_signal_thread,
778 .ret_type = RET_INTEGER,
779 .arg1_type = ARG_ANYTHING,
782 const struct bpf_func_proto *
783 bpf_tracing_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
786 case BPF_FUNC_map_lookup_elem:
787 return &bpf_map_lookup_elem_proto;
788 case BPF_FUNC_map_update_elem:
789 return &bpf_map_update_elem_proto;
790 case BPF_FUNC_map_delete_elem:
791 return &bpf_map_delete_elem_proto;
792 case BPF_FUNC_map_push_elem:
793 return &bpf_map_push_elem_proto;
794 case BPF_FUNC_map_pop_elem:
795 return &bpf_map_pop_elem_proto;
796 case BPF_FUNC_map_peek_elem:
797 return &bpf_map_peek_elem_proto;
798 case BPF_FUNC_ktime_get_ns:
799 return &bpf_ktime_get_ns_proto;
800 case BPF_FUNC_tail_call:
801 return &bpf_tail_call_proto;
802 case BPF_FUNC_get_current_pid_tgid:
803 return &bpf_get_current_pid_tgid_proto;
804 case BPF_FUNC_get_current_task:
805 return &bpf_get_current_task_proto;
806 case BPF_FUNC_get_current_uid_gid:
807 return &bpf_get_current_uid_gid_proto;
808 case BPF_FUNC_get_current_comm:
809 return &bpf_get_current_comm_proto;
810 case BPF_FUNC_trace_printk:
811 return bpf_get_trace_printk_proto();
812 case BPF_FUNC_get_smp_processor_id:
813 return &bpf_get_smp_processor_id_proto;
814 case BPF_FUNC_get_numa_node_id:
815 return &bpf_get_numa_node_id_proto;
816 case BPF_FUNC_perf_event_read:
817 return &bpf_perf_event_read_proto;
818 case BPF_FUNC_probe_write_user:
819 return bpf_get_probe_write_proto();
820 case BPF_FUNC_current_task_under_cgroup:
821 return &bpf_current_task_under_cgroup_proto;
822 case BPF_FUNC_get_prandom_u32:
823 return &bpf_get_prandom_u32_proto;
824 case BPF_FUNC_probe_read_user:
825 return &bpf_probe_read_user_proto;
826 case BPF_FUNC_probe_read_kernel:
827 return &bpf_probe_read_kernel_proto;
828 case BPF_FUNC_probe_read_user_str:
829 return &bpf_probe_read_user_str_proto;
830 case BPF_FUNC_probe_read_kernel_str:
831 return &bpf_probe_read_kernel_str_proto;
832 #ifdef CONFIG_ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE
833 case BPF_FUNC_probe_read:
834 return &bpf_probe_read_compat_proto;
835 case BPF_FUNC_probe_read_str:
836 return &bpf_probe_read_compat_str_proto;
838 #ifdef CONFIG_CGROUPS
839 case BPF_FUNC_get_current_cgroup_id:
840 return &bpf_get_current_cgroup_id_proto;
842 case BPF_FUNC_send_signal:
843 return &bpf_send_signal_proto;
844 case BPF_FUNC_send_signal_thread:
845 return &bpf_send_signal_thread_proto;
846 case BPF_FUNC_perf_event_read_value:
847 return &bpf_perf_event_read_value_proto;
848 case BPF_FUNC_get_ns_current_pid_tgid:
849 return &bpf_get_ns_current_pid_tgid_proto;
855 static const struct bpf_func_proto *
856 kprobe_prog_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
859 case BPF_FUNC_perf_event_output:
860 return &bpf_perf_event_output_proto;
861 case BPF_FUNC_get_stackid:
862 return &bpf_get_stackid_proto;
863 case BPF_FUNC_get_stack:
864 return &bpf_get_stack_proto;
865 #ifdef CONFIG_BPF_KPROBE_OVERRIDE
866 case BPF_FUNC_override_return:
867 return &bpf_override_return_proto;
870 return bpf_tracing_func_proto(func_id, prog);
874 /* bpf+kprobe programs can access fields of 'struct pt_regs' */
875 static bool kprobe_prog_is_valid_access(int off, int size, enum bpf_access_type type,
876 const struct bpf_prog *prog,
877 struct bpf_insn_access_aux *info)
879 if (off < 0 || off >= sizeof(struct pt_regs))
881 if (type != BPF_READ)
886 * Assertion for 32 bit to make sure last 8 byte access
887 * (BPF_DW) to the last 4 byte member is disallowed.
889 if (off + size > sizeof(struct pt_regs))
895 const struct bpf_verifier_ops kprobe_verifier_ops = {
896 .get_func_proto = kprobe_prog_func_proto,
897 .is_valid_access = kprobe_prog_is_valid_access,
900 const struct bpf_prog_ops kprobe_prog_ops = {
903 BPF_CALL_5(bpf_perf_event_output_tp, void *, tp_buff, struct bpf_map *, map,
904 u64, flags, void *, data, u64, size)
906 struct pt_regs *regs = *(struct pt_regs **)tp_buff;
909 * r1 points to perf tracepoint buffer where first 8 bytes are hidden
910 * from bpf program and contain a pointer to 'struct pt_regs'. Fetch it
911 * from there and call the same bpf_perf_event_output() helper inline.
913 return ____bpf_perf_event_output(regs, map, flags, data, size);
916 static const struct bpf_func_proto bpf_perf_event_output_proto_tp = {
917 .func = bpf_perf_event_output_tp,
919 .ret_type = RET_INTEGER,
920 .arg1_type = ARG_PTR_TO_CTX,
921 .arg2_type = ARG_CONST_MAP_PTR,
922 .arg3_type = ARG_ANYTHING,
923 .arg4_type = ARG_PTR_TO_MEM,
924 .arg5_type = ARG_CONST_SIZE_OR_ZERO,
927 BPF_CALL_3(bpf_get_stackid_tp, void *, tp_buff, struct bpf_map *, map,
930 struct pt_regs *regs = *(struct pt_regs **)tp_buff;
933 * Same comment as in bpf_perf_event_output_tp(), only that this time
934 * the other helper's function body cannot be inlined due to being
935 * external, thus we need to call raw helper function.
937 return bpf_get_stackid((unsigned long) regs, (unsigned long) map,
941 static const struct bpf_func_proto bpf_get_stackid_proto_tp = {
942 .func = bpf_get_stackid_tp,
944 .ret_type = RET_INTEGER,
945 .arg1_type = ARG_PTR_TO_CTX,
946 .arg2_type = ARG_CONST_MAP_PTR,
947 .arg3_type = ARG_ANYTHING,
950 BPF_CALL_4(bpf_get_stack_tp, void *, tp_buff, void *, buf, u32, size,
953 struct pt_regs *regs = *(struct pt_regs **)tp_buff;
955 return bpf_get_stack((unsigned long) regs, (unsigned long) buf,
956 (unsigned long) size, flags, 0);
959 static const struct bpf_func_proto bpf_get_stack_proto_tp = {
960 .func = bpf_get_stack_tp,
962 .ret_type = RET_INTEGER,
963 .arg1_type = ARG_PTR_TO_CTX,
964 .arg2_type = ARG_PTR_TO_UNINIT_MEM,
965 .arg3_type = ARG_CONST_SIZE_OR_ZERO,
966 .arg4_type = ARG_ANYTHING,
969 static const struct bpf_func_proto *
970 tp_prog_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
973 case BPF_FUNC_perf_event_output:
974 return &bpf_perf_event_output_proto_tp;
975 case BPF_FUNC_get_stackid:
976 return &bpf_get_stackid_proto_tp;
977 case BPF_FUNC_get_stack:
978 return &bpf_get_stack_proto_tp;
980 return bpf_tracing_func_proto(func_id, prog);
984 static bool tp_prog_is_valid_access(int off, int size, enum bpf_access_type type,
985 const struct bpf_prog *prog,
986 struct bpf_insn_access_aux *info)
988 if (off < sizeof(void *) || off >= PERF_MAX_TRACE_SIZE)
990 if (type != BPF_READ)
995 BUILD_BUG_ON(PERF_MAX_TRACE_SIZE % sizeof(__u64));
999 const struct bpf_verifier_ops tracepoint_verifier_ops = {
1000 .get_func_proto = tp_prog_func_proto,
1001 .is_valid_access = tp_prog_is_valid_access,
1004 const struct bpf_prog_ops tracepoint_prog_ops = {
1007 BPF_CALL_3(bpf_perf_prog_read_value, struct bpf_perf_event_data_kern *, ctx,
1008 struct bpf_perf_event_value *, buf, u32, size)
1012 if (unlikely(size != sizeof(struct bpf_perf_event_value)))
1014 err = perf_event_read_local(ctx->event, &buf->counter, &buf->enabled,
1020 memset(buf, 0, size);
1024 static const struct bpf_func_proto bpf_perf_prog_read_value_proto = {
1025 .func = bpf_perf_prog_read_value,
1027 .ret_type = RET_INTEGER,
1028 .arg1_type = ARG_PTR_TO_CTX,
1029 .arg2_type = ARG_PTR_TO_UNINIT_MEM,
1030 .arg3_type = ARG_CONST_SIZE,
1033 BPF_CALL_4(bpf_read_branch_records, struct bpf_perf_event_data_kern *, ctx,
1034 void *, buf, u32, size, u64, flags)
1039 static const u32 br_entry_size = sizeof(struct perf_branch_entry);
1040 struct perf_branch_stack *br_stack = ctx->data->br_stack;
1043 if (unlikely(flags & ~BPF_F_GET_BRANCH_RECORDS_SIZE))
1046 if (unlikely(!br_stack))
1049 if (flags & BPF_F_GET_BRANCH_RECORDS_SIZE)
1050 return br_stack->nr * br_entry_size;
1052 if (!buf || (size % br_entry_size != 0))
1055 to_copy = min_t(u32, br_stack->nr * br_entry_size, size);
1056 memcpy(buf, br_stack->entries, to_copy);
1062 static const struct bpf_func_proto bpf_read_branch_records_proto = {
1063 .func = bpf_read_branch_records,
1065 .ret_type = RET_INTEGER,
1066 .arg1_type = ARG_PTR_TO_CTX,
1067 .arg2_type = ARG_PTR_TO_MEM_OR_NULL,
1068 .arg3_type = ARG_CONST_SIZE_OR_ZERO,
1069 .arg4_type = ARG_ANYTHING,
1072 static const struct bpf_func_proto *
1073 pe_prog_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
1076 case BPF_FUNC_perf_event_output:
1077 return &bpf_perf_event_output_proto_tp;
1078 case BPF_FUNC_get_stackid:
1079 return &bpf_get_stackid_proto_tp;
1080 case BPF_FUNC_get_stack:
1081 return &bpf_get_stack_proto_tp;
1082 case BPF_FUNC_perf_prog_read_value:
1083 return &bpf_perf_prog_read_value_proto;
1084 case BPF_FUNC_read_branch_records:
1085 return &bpf_read_branch_records_proto;
1087 return bpf_tracing_func_proto(func_id, prog);
1092 * bpf_raw_tp_regs are separate from bpf_pt_regs used from skb/xdp
1093 * to avoid potential recursive reuse issue when/if tracepoints are added
1094 * inside bpf_*_event_output, bpf_get_stackid and/or bpf_get_stack.
1096 * Since raw tracepoints run despite bpf_prog_active, support concurrent usage
1097 * in normal, irq, and nmi context.
1099 struct bpf_raw_tp_regs {
1100 struct pt_regs regs[3];
1102 static DEFINE_PER_CPU(struct bpf_raw_tp_regs, bpf_raw_tp_regs);
1103 static DEFINE_PER_CPU(int, bpf_raw_tp_nest_level);
1104 static struct pt_regs *get_bpf_raw_tp_regs(void)
1106 struct bpf_raw_tp_regs *tp_regs = this_cpu_ptr(&bpf_raw_tp_regs);
1107 int nest_level = this_cpu_inc_return(bpf_raw_tp_nest_level);
1109 if (WARN_ON_ONCE(nest_level > ARRAY_SIZE(tp_regs->regs))) {
1110 this_cpu_dec(bpf_raw_tp_nest_level);
1111 return ERR_PTR(-EBUSY);
1114 return &tp_regs->regs[nest_level - 1];
1117 static void put_bpf_raw_tp_regs(void)
1119 this_cpu_dec(bpf_raw_tp_nest_level);
1122 BPF_CALL_5(bpf_perf_event_output_raw_tp, struct bpf_raw_tracepoint_args *, args,
1123 struct bpf_map *, map, u64, flags, void *, data, u64, size)
1125 struct pt_regs *regs = get_bpf_raw_tp_regs();
1129 return PTR_ERR(regs);
1131 perf_fetch_caller_regs(regs);
1132 ret = ____bpf_perf_event_output(regs, map, flags, data, size);
1134 put_bpf_raw_tp_regs();
1138 static const struct bpf_func_proto bpf_perf_event_output_proto_raw_tp = {
1139 .func = bpf_perf_event_output_raw_tp,
1141 .ret_type = RET_INTEGER,
1142 .arg1_type = ARG_PTR_TO_CTX,
1143 .arg2_type = ARG_CONST_MAP_PTR,
1144 .arg3_type = ARG_ANYTHING,
1145 .arg4_type = ARG_PTR_TO_MEM,
1146 .arg5_type = ARG_CONST_SIZE_OR_ZERO,
1149 extern const struct bpf_func_proto bpf_skb_output_proto;
1150 extern const struct bpf_func_proto bpf_xdp_output_proto;
1152 BPF_CALL_3(bpf_get_stackid_raw_tp, struct bpf_raw_tracepoint_args *, args,
1153 struct bpf_map *, map, u64, flags)
1155 struct pt_regs *regs = get_bpf_raw_tp_regs();
1159 return PTR_ERR(regs);
1161 perf_fetch_caller_regs(regs);
1162 /* similar to bpf_perf_event_output_tp, but pt_regs fetched differently */
1163 ret = bpf_get_stackid((unsigned long) regs, (unsigned long) map,
1165 put_bpf_raw_tp_regs();
1169 static const struct bpf_func_proto bpf_get_stackid_proto_raw_tp = {
1170 .func = bpf_get_stackid_raw_tp,
1172 .ret_type = RET_INTEGER,
1173 .arg1_type = ARG_PTR_TO_CTX,
1174 .arg2_type = ARG_CONST_MAP_PTR,
1175 .arg3_type = ARG_ANYTHING,
1178 BPF_CALL_4(bpf_get_stack_raw_tp, struct bpf_raw_tracepoint_args *, args,
1179 void *, buf, u32, size, u64, flags)
1181 struct pt_regs *regs = get_bpf_raw_tp_regs();
1185 return PTR_ERR(regs);
1187 perf_fetch_caller_regs(regs);
1188 ret = bpf_get_stack((unsigned long) regs, (unsigned long) buf,
1189 (unsigned long) size, flags, 0);
1190 put_bpf_raw_tp_regs();
1194 static const struct bpf_func_proto bpf_get_stack_proto_raw_tp = {
1195 .func = bpf_get_stack_raw_tp,
1197 .ret_type = RET_INTEGER,
1198 .arg1_type = ARG_PTR_TO_CTX,
1199 .arg2_type = ARG_PTR_TO_MEM,
1200 .arg3_type = ARG_CONST_SIZE_OR_ZERO,
1201 .arg4_type = ARG_ANYTHING,
1204 static const struct bpf_func_proto *
1205 raw_tp_prog_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
1208 case BPF_FUNC_perf_event_output:
1209 return &bpf_perf_event_output_proto_raw_tp;
1210 case BPF_FUNC_get_stackid:
1211 return &bpf_get_stackid_proto_raw_tp;
1212 case BPF_FUNC_get_stack:
1213 return &bpf_get_stack_proto_raw_tp;
1215 return bpf_tracing_func_proto(func_id, prog);
1219 static const struct bpf_func_proto *
1220 tracing_prog_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
1224 case BPF_FUNC_skb_output:
1225 return &bpf_skb_output_proto;
1226 case BPF_FUNC_xdp_output:
1227 return &bpf_xdp_output_proto;
1230 return raw_tp_prog_func_proto(func_id, prog);
1234 static bool raw_tp_prog_is_valid_access(int off, int size,
1235 enum bpf_access_type type,
1236 const struct bpf_prog *prog,
1237 struct bpf_insn_access_aux *info)
1239 if (off < 0 || off >= sizeof(__u64) * MAX_BPF_FUNC_ARGS)
1241 if (type != BPF_READ)
1243 if (off % size != 0)
1248 static bool tracing_prog_is_valid_access(int off, int size,
1249 enum bpf_access_type type,
1250 const struct bpf_prog *prog,
1251 struct bpf_insn_access_aux *info)
1253 if (off < 0 || off >= sizeof(__u64) * MAX_BPF_FUNC_ARGS)
1255 if (type != BPF_READ)
1257 if (off % size != 0)
1259 return btf_ctx_access(off, size, type, prog, info);
1262 int __weak bpf_prog_test_run_tracing(struct bpf_prog *prog,
1263 const union bpf_attr *kattr,
1264 union bpf_attr __user *uattr)
1269 const struct bpf_verifier_ops raw_tracepoint_verifier_ops = {
1270 .get_func_proto = raw_tp_prog_func_proto,
1271 .is_valid_access = raw_tp_prog_is_valid_access,
1274 const struct bpf_prog_ops raw_tracepoint_prog_ops = {
1277 const struct bpf_verifier_ops tracing_verifier_ops = {
1278 .get_func_proto = tracing_prog_func_proto,
1279 .is_valid_access = tracing_prog_is_valid_access,
1282 const struct bpf_prog_ops tracing_prog_ops = {
1283 .test_run = bpf_prog_test_run_tracing,
1286 static bool raw_tp_writable_prog_is_valid_access(int off, int size,
1287 enum bpf_access_type type,
1288 const struct bpf_prog *prog,
1289 struct bpf_insn_access_aux *info)
1292 if (size != sizeof(u64) || type != BPF_READ)
1294 info->reg_type = PTR_TO_TP_BUFFER;
1296 return raw_tp_prog_is_valid_access(off, size, type, prog, info);
1299 const struct bpf_verifier_ops raw_tracepoint_writable_verifier_ops = {
1300 .get_func_proto = raw_tp_prog_func_proto,
1301 .is_valid_access = raw_tp_writable_prog_is_valid_access,
1304 const struct bpf_prog_ops raw_tracepoint_writable_prog_ops = {
1307 static bool pe_prog_is_valid_access(int off, int size, enum bpf_access_type type,
1308 const struct bpf_prog *prog,
1309 struct bpf_insn_access_aux *info)
1311 const int size_u64 = sizeof(u64);
1313 if (off < 0 || off >= sizeof(struct bpf_perf_event_data))
1315 if (type != BPF_READ)
1317 if (off % size != 0) {
1318 if (sizeof(unsigned long) != 4)
1322 if (off % size != 4)
1327 case bpf_ctx_range(struct bpf_perf_event_data, sample_period):
1328 bpf_ctx_record_field_size(info, size_u64);
1329 if (!bpf_ctx_narrow_access_ok(off, size, size_u64))
1332 case bpf_ctx_range(struct bpf_perf_event_data, addr):
1333 bpf_ctx_record_field_size(info, size_u64);
1334 if (!bpf_ctx_narrow_access_ok(off, size, size_u64))
1338 if (size != sizeof(long))
1345 static u32 pe_prog_convert_ctx_access(enum bpf_access_type type,
1346 const struct bpf_insn *si,
1347 struct bpf_insn *insn_buf,
1348 struct bpf_prog *prog, u32 *target_size)
1350 struct bpf_insn *insn = insn_buf;
1353 case offsetof(struct bpf_perf_event_data, sample_period):
1354 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct bpf_perf_event_data_kern,
1355 data), si->dst_reg, si->src_reg,
1356 offsetof(struct bpf_perf_event_data_kern, data));
1357 *insn++ = BPF_LDX_MEM(BPF_DW, si->dst_reg, si->dst_reg,
1358 bpf_target_off(struct perf_sample_data, period, 8,
1361 case offsetof(struct bpf_perf_event_data, addr):
1362 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct bpf_perf_event_data_kern,
1363 data), si->dst_reg, si->src_reg,
1364 offsetof(struct bpf_perf_event_data_kern, data));
1365 *insn++ = BPF_LDX_MEM(BPF_DW, si->dst_reg, si->dst_reg,
1366 bpf_target_off(struct perf_sample_data, addr, 8,
1370 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct bpf_perf_event_data_kern,
1371 regs), si->dst_reg, si->src_reg,
1372 offsetof(struct bpf_perf_event_data_kern, regs));
1373 *insn++ = BPF_LDX_MEM(BPF_SIZEOF(long), si->dst_reg, si->dst_reg,
1378 return insn - insn_buf;
1381 const struct bpf_verifier_ops perf_event_verifier_ops = {
1382 .get_func_proto = pe_prog_func_proto,
1383 .is_valid_access = pe_prog_is_valid_access,
1384 .convert_ctx_access = pe_prog_convert_ctx_access,
1387 const struct bpf_prog_ops perf_event_prog_ops = {
1390 static DEFINE_MUTEX(bpf_event_mutex);
1392 #define BPF_TRACE_MAX_PROGS 64
1394 int perf_event_attach_bpf_prog(struct perf_event *event,
1395 struct bpf_prog *prog)
1397 struct bpf_prog_array *old_array;
1398 struct bpf_prog_array *new_array;
1402 * Kprobe override only works if they are on the function entry,
1403 * and only if they are on the opt-in list.
1405 if (prog->kprobe_override &&
1406 (!trace_kprobe_on_func_entry(event->tp_event) ||
1407 !trace_kprobe_error_injectable(event->tp_event)))
1410 mutex_lock(&bpf_event_mutex);
1415 old_array = bpf_event_rcu_dereference(event->tp_event->prog_array);
1417 bpf_prog_array_length(old_array) >= BPF_TRACE_MAX_PROGS) {
1422 ret = bpf_prog_array_copy(old_array, NULL, prog, &new_array);
1426 /* set the new array to event->tp_event and set event->prog */
1428 rcu_assign_pointer(event->tp_event->prog_array, new_array);
1429 bpf_prog_array_free(old_array);
1432 mutex_unlock(&bpf_event_mutex);
1436 void perf_event_detach_bpf_prog(struct perf_event *event)
1438 struct bpf_prog_array *old_array;
1439 struct bpf_prog_array *new_array;
1442 mutex_lock(&bpf_event_mutex);
1447 old_array = bpf_event_rcu_dereference(event->tp_event->prog_array);
1448 ret = bpf_prog_array_copy(old_array, event->prog, NULL, &new_array);
1452 bpf_prog_array_delete_safe(old_array, event->prog);
1454 rcu_assign_pointer(event->tp_event->prog_array, new_array);
1455 bpf_prog_array_free(old_array);
1458 bpf_prog_put(event->prog);
1462 mutex_unlock(&bpf_event_mutex);
1465 int perf_event_query_prog_array(struct perf_event *event, void __user *info)
1467 struct perf_event_query_bpf __user *uquery = info;
1468 struct perf_event_query_bpf query = {};
1469 struct bpf_prog_array *progs;
1470 u32 *ids, prog_cnt, ids_len;
1473 if (!capable(CAP_SYS_ADMIN))
1475 if (event->attr.type != PERF_TYPE_TRACEPOINT)
1477 if (copy_from_user(&query, uquery, sizeof(query)))
1480 ids_len = query.ids_len;
1481 if (ids_len > BPF_TRACE_MAX_PROGS)
1483 ids = kcalloc(ids_len, sizeof(u32), GFP_USER | __GFP_NOWARN);
1487 * The above kcalloc returns ZERO_SIZE_PTR when ids_len = 0, which
1488 * is required when user only wants to check for uquery->prog_cnt.
1489 * There is no need to check for it since the case is handled
1490 * gracefully in bpf_prog_array_copy_info.
1493 mutex_lock(&bpf_event_mutex);
1494 progs = bpf_event_rcu_dereference(event->tp_event->prog_array);
1495 ret = bpf_prog_array_copy_info(progs, ids, ids_len, &prog_cnt);
1496 mutex_unlock(&bpf_event_mutex);
1498 if (copy_to_user(&uquery->prog_cnt, &prog_cnt, sizeof(prog_cnt)) ||
1499 copy_to_user(uquery->ids, ids, ids_len * sizeof(u32)))
1506 extern struct bpf_raw_event_map __start__bpf_raw_tp[];
1507 extern struct bpf_raw_event_map __stop__bpf_raw_tp[];
1509 struct bpf_raw_event_map *bpf_get_raw_tracepoint(const char *name)
1511 struct bpf_raw_event_map *btp = __start__bpf_raw_tp;
1513 for (; btp < __stop__bpf_raw_tp; btp++) {
1514 if (!strcmp(btp->tp->name, name))
1518 return bpf_get_raw_tracepoint_module(name);
1521 void bpf_put_raw_tracepoint(struct bpf_raw_event_map *btp)
1523 struct module *mod = __module_address((unsigned long)btp);
1529 static __always_inline
1530 void __bpf_trace_run(struct bpf_prog *prog, u64 *args)
1534 (void) BPF_PROG_RUN(prog, args);
1538 #define UNPACK(...) __VA_ARGS__
1539 #define REPEAT_1(FN, DL, X, ...) FN(X)
1540 #define REPEAT_2(FN, DL, X, ...) FN(X) UNPACK DL REPEAT_1(FN, DL, __VA_ARGS__)
1541 #define REPEAT_3(FN, DL, X, ...) FN(X) UNPACK DL REPEAT_2(FN, DL, __VA_ARGS__)
1542 #define REPEAT_4(FN, DL, X, ...) FN(X) UNPACK DL REPEAT_3(FN, DL, __VA_ARGS__)
1543 #define REPEAT_5(FN, DL, X, ...) FN(X) UNPACK DL REPEAT_4(FN, DL, __VA_ARGS__)
1544 #define REPEAT_6(FN, DL, X, ...) FN(X) UNPACK DL REPEAT_5(FN, DL, __VA_ARGS__)
1545 #define REPEAT_7(FN, DL, X, ...) FN(X) UNPACK DL REPEAT_6(FN, DL, __VA_ARGS__)
1546 #define REPEAT_8(FN, DL, X, ...) FN(X) UNPACK DL REPEAT_7(FN, DL, __VA_ARGS__)
1547 #define REPEAT_9(FN, DL, X, ...) FN(X) UNPACK DL REPEAT_8(FN, DL, __VA_ARGS__)
1548 #define REPEAT_10(FN, DL, X, ...) FN(X) UNPACK DL REPEAT_9(FN, DL, __VA_ARGS__)
1549 #define REPEAT_11(FN, DL, X, ...) FN(X) UNPACK DL REPEAT_10(FN, DL, __VA_ARGS__)
1550 #define REPEAT_12(FN, DL, X, ...) FN(X) UNPACK DL REPEAT_11(FN, DL, __VA_ARGS__)
1551 #define REPEAT(X, FN, DL, ...) REPEAT_##X(FN, DL, __VA_ARGS__)
1553 #define SARG(X) u64 arg##X
1554 #define COPY(X) args[X] = arg##X
1556 #define __DL_COM (,)
1557 #define __DL_SEM (;)
1559 #define __SEQ_0_11 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11
1561 #define BPF_TRACE_DEFN_x(x) \
1562 void bpf_trace_run##x(struct bpf_prog *prog, \
1563 REPEAT(x, SARG, __DL_COM, __SEQ_0_11)) \
1566 REPEAT(x, COPY, __DL_SEM, __SEQ_0_11); \
1567 __bpf_trace_run(prog, args); \
1569 EXPORT_SYMBOL_GPL(bpf_trace_run##x)
1570 BPF_TRACE_DEFN_x(1);
1571 BPF_TRACE_DEFN_x(2);
1572 BPF_TRACE_DEFN_x(3);
1573 BPF_TRACE_DEFN_x(4);
1574 BPF_TRACE_DEFN_x(5);
1575 BPF_TRACE_DEFN_x(6);
1576 BPF_TRACE_DEFN_x(7);
1577 BPF_TRACE_DEFN_x(8);
1578 BPF_TRACE_DEFN_x(9);
1579 BPF_TRACE_DEFN_x(10);
1580 BPF_TRACE_DEFN_x(11);
1581 BPF_TRACE_DEFN_x(12);
1583 static int __bpf_probe_register(struct bpf_raw_event_map *btp, struct bpf_prog *prog)
1585 struct tracepoint *tp = btp->tp;
1588 * check that program doesn't access arguments beyond what's
1589 * available in this tracepoint
1591 if (prog->aux->max_ctx_offset > btp->num_args * sizeof(u64))
1594 if (prog->aux->max_tp_access > btp->writable_size)
1597 return tracepoint_probe_register(tp, (void *)btp->bpf_func, prog);
1600 int bpf_probe_register(struct bpf_raw_event_map *btp, struct bpf_prog *prog)
1602 return __bpf_probe_register(btp, prog);
1605 int bpf_probe_unregister(struct bpf_raw_event_map *btp, struct bpf_prog *prog)
1607 return tracepoint_probe_unregister(btp->tp, (void *)btp->bpf_func, prog);
1610 int bpf_get_perf_event_info(const struct perf_event *event, u32 *prog_id,
1611 u32 *fd_type, const char **buf,
1612 u64 *probe_offset, u64 *probe_addr)
1614 bool is_tracepoint, is_syscall_tp;
1615 struct bpf_prog *prog;
1622 /* not supporting BPF_PROG_TYPE_PERF_EVENT yet */
1623 if (prog->type == BPF_PROG_TYPE_PERF_EVENT)
1626 *prog_id = prog->aux->id;
1627 flags = event->tp_event->flags;
1628 is_tracepoint = flags & TRACE_EVENT_FL_TRACEPOINT;
1629 is_syscall_tp = is_syscall_trace_event(event->tp_event);
1631 if (is_tracepoint || is_syscall_tp) {
1632 *buf = is_tracepoint ? event->tp_event->tp->name
1633 : event->tp_event->name;
1634 *fd_type = BPF_FD_TYPE_TRACEPOINT;
1635 *probe_offset = 0x0;
1640 #ifdef CONFIG_KPROBE_EVENTS
1641 if (flags & TRACE_EVENT_FL_KPROBE)
1642 err = bpf_get_kprobe_info(event, fd_type, buf,
1643 probe_offset, probe_addr,
1644 event->attr.type == PERF_TYPE_TRACEPOINT);
1646 #ifdef CONFIG_UPROBE_EVENTS
1647 if (flags & TRACE_EVENT_FL_UPROBE)
1648 err = bpf_get_uprobe_info(event, fd_type, buf,
1650 event->attr.type == PERF_TYPE_TRACEPOINT);
1657 static int __init send_signal_irq_work_init(void)
1660 struct send_signal_irq_work *work;
1662 for_each_possible_cpu(cpu) {
1663 work = per_cpu_ptr(&send_signal_work, cpu);
1664 init_irq_work(&work->irq_work, do_bpf_send_signal);
1669 subsys_initcall(send_signal_irq_work_init);
1671 #ifdef CONFIG_MODULES
1672 static int bpf_event_notify(struct notifier_block *nb, unsigned long op,
1675 struct bpf_trace_module *btm, *tmp;
1676 struct module *mod = module;
1678 if (mod->num_bpf_raw_events == 0 ||
1679 (op != MODULE_STATE_COMING && op != MODULE_STATE_GOING))
1682 mutex_lock(&bpf_module_mutex);
1685 case MODULE_STATE_COMING:
1686 btm = kzalloc(sizeof(*btm), GFP_KERNEL);
1688 btm->module = module;
1689 list_add(&btm->list, &bpf_trace_modules);
1692 case MODULE_STATE_GOING:
1693 list_for_each_entry_safe(btm, tmp, &bpf_trace_modules, list) {
1694 if (btm->module == module) {
1695 list_del(&btm->list);
1703 mutex_unlock(&bpf_module_mutex);
1708 static struct notifier_block bpf_module_nb = {
1709 .notifier_call = bpf_event_notify,
1712 static int __init bpf_event_init(void)
1714 register_module_notifier(&bpf_module_nb);
1718 fs_initcall(bpf_event_init);
1719 #endif /* CONFIG_MODULES */