1 // SPDX-License-Identifier: GPL-2.0-only
2 /* Copyright (c) 2011-2014 PLUMgrid, http://plumgrid.com
5 #include <linux/rcupdate.h>
6 #include <linux/random.h>
8 #include <linux/topology.h>
9 #include <linux/ktime.h>
10 #include <linux/sched.h>
11 #include <linux/uidgid.h>
12 #include <linux/filter.h>
13 #include <linux/ctype.h>
14 #include <linux/jiffies.h>
15 #include <linux/pid_namespace.h>
16 #include <linux/proc_ns.h>
17 #include <linux/security.h>
19 #include "../../lib/kstrtox.h"
21 /* If kernel subsystem is allowing eBPF programs to call this function,
22 * inside its own verifier_ops->get_func_proto() callback it should return
23 * bpf_map_lookup_elem_proto, so that verifier can properly check the arguments
25 * Different map implementations will rely on rcu in map methods
26 * lookup/update/delete, therefore eBPF programs must run under rcu lock
27 * if program is allowed to access maps, so check rcu_read_lock_held in
28 * all three functions.
30 BPF_CALL_2(bpf_map_lookup_elem, struct bpf_map *, map, void *, key)
32 WARN_ON_ONCE(!rcu_read_lock_held() && !rcu_read_lock_bh_held());
33 return (unsigned long) map->ops->map_lookup_elem(map, key);
36 const struct bpf_func_proto bpf_map_lookup_elem_proto = {
37 .func = bpf_map_lookup_elem,
40 .ret_type = RET_PTR_TO_MAP_VALUE_OR_NULL,
41 .arg1_type = ARG_CONST_MAP_PTR,
42 .arg2_type = ARG_PTR_TO_MAP_KEY,
45 BPF_CALL_4(bpf_map_update_elem, struct bpf_map *, map, void *, key,
46 void *, value, u64, flags)
48 WARN_ON_ONCE(!rcu_read_lock_held() && !rcu_read_lock_bh_held());
49 return map->ops->map_update_elem(map, key, value, flags);
52 const struct bpf_func_proto bpf_map_update_elem_proto = {
53 .func = bpf_map_update_elem,
56 .ret_type = RET_INTEGER,
57 .arg1_type = ARG_CONST_MAP_PTR,
58 .arg2_type = ARG_PTR_TO_MAP_KEY,
59 .arg3_type = ARG_PTR_TO_MAP_VALUE,
60 .arg4_type = ARG_ANYTHING,
63 BPF_CALL_2(bpf_map_delete_elem, struct bpf_map *, map, void *, key)
65 WARN_ON_ONCE(!rcu_read_lock_held() && !rcu_read_lock_bh_held());
66 return map->ops->map_delete_elem(map, key);
69 const struct bpf_func_proto bpf_map_delete_elem_proto = {
70 .func = bpf_map_delete_elem,
73 .ret_type = RET_INTEGER,
74 .arg1_type = ARG_CONST_MAP_PTR,
75 .arg2_type = ARG_PTR_TO_MAP_KEY,
78 BPF_CALL_3(bpf_map_push_elem, struct bpf_map *, map, void *, value, u64, flags)
80 return map->ops->map_push_elem(map, value, flags);
83 const struct bpf_func_proto bpf_map_push_elem_proto = {
84 .func = bpf_map_push_elem,
87 .ret_type = RET_INTEGER,
88 .arg1_type = ARG_CONST_MAP_PTR,
89 .arg2_type = ARG_PTR_TO_MAP_VALUE,
90 .arg3_type = ARG_ANYTHING,
93 BPF_CALL_2(bpf_map_pop_elem, struct bpf_map *, map, void *, value)
95 return map->ops->map_pop_elem(map, value);
98 const struct bpf_func_proto bpf_map_pop_elem_proto = {
99 .func = bpf_map_pop_elem,
101 .ret_type = RET_INTEGER,
102 .arg1_type = ARG_CONST_MAP_PTR,
103 .arg2_type = ARG_PTR_TO_UNINIT_MAP_VALUE,
106 BPF_CALL_2(bpf_map_peek_elem, struct bpf_map *, map, void *, value)
108 return map->ops->map_peek_elem(map, value);
111 const struct bpf_func_proto bpf_map_peek_elem_proto = {
112 .func = bpf_map_peek_elem,
114 .ret_type = RET_INTEGER,
115 .arg1_type = ARG_CONST_MAP_PTR,
116 .arg2_type = ARG_PTR_TO_UNINIT_MAP_VALUE,
119 const struct bpf_func_proto bpf_get_prandom_u32_proto = {
120 .func = bpf_user_rnd_u32,
122 .ret_type = RET_INTEGER,
125 BPF_CALL_0(bpf_get_smp_processor_id)
127 return smp_processor_id();
130 const struct bpf_func_proto bpf_get_smp_processor_id_proto = {
131 .func = bpf_get_smp_processor_id,
133 .ret_type = RET_INTEGER,
136 BPF_CALL_0(bpf_get_numa_node_id)
138 return numa_node_id();
141 const struct bpf_func_proto bpf_get_numa_node_id_proto = {
142 .func = bpf_get_numa_node_id,
144 .ret_type = RET_INTEGER,
147 BPF_CALL_0(bpf_ktime_get_ns)
149 /* NMI safe access to clock monotonic */
150 return ktime_get_mono_fast_ns();
153 const struct bpf_func_proto bpf_ktime_get_ns_proto = {
154 .func = bpf_ktime_get_ns,
156 .ret_type = RET_INTEGER,
159 BPF_CALL_0(bpf_ktime_get_boot_ns)
161 /* NMI safe access to clock boottime */
162 return ktime_get_boot_fast_ns();
165 const struct bpf_func_proto bpf_ktime_get_boot_ns_proto = {
166 .func = bpf_ktime_get_boot_ns,
168 .ret_type = RET_INTEGER,
171 BPF_CALL_0(bpf_ktime_get_coarse_ns)
173 return ktime_get_coarse_ns();
176 const struct bpf_func_proto bpf_ktime_get_coarse_ns_proto = {
177 .func = bpf_ktime_get_coarse_ns,
179 .ret_type = RET_INTEGER,
182 BPF_CALL_0(bpf_get_current_pid_tgid)
184 struct task_struct *task = current;
189 return (u64) task->tgid << 32 | task->pid;
192 const struct bpf_func_proto bpf_get_current_pid_tgid_proto = {
193 .func = bpf_get_current_pid_tgid,
195 .ret_type = RET_INTEGER,
198 BPF_CALL_0(bpf_get_current_uid_gid)
200 struct task_struct *task = current;
207 current_uid_gid(&uid, &gid);
208 return (u64) from_kgid(&init_user_ns, gid) << 32 |
209 from_kuid(&init_user_ns, uid);
212 const struct bpf_func_proto bpf_get_current_uid_gid_proto = {
213 .func = bpf_get_current_uid_gid,
215 .ret_type = RET_INTEGER,
218 BPF_CALL_2(bpf_get_current_comm, char *, buf, u32, size)
220 struct task_struct *task = current;
225 strncpy(buf, task->comm, size);
227 /* Verifier guarantees that size > 0. For task->comm exceeding
228 * size, guarantee that buf is %NUL-terminated. Unconditionally
229 * done here to save the size test.
234 memset(buf, 0, size);
238 const struct bpf_func_proto bpf_get_current_comm_proto = {
239 .func = bpf_get_current_comm,
241 .ret_type = RET_INTEGER,
242 .arg1_type = ARG_PTR_TO_UNINIT_MEM,
243 .arg2_type = ARG_CONST_SIZE,
246 #if defined(CONFIG_QUEUED_SPINLOCKS) || defined(CONFIG_BPF_ARCH_SPINLOCK)
248 static inline void __bpf_spin_lock(struct bpf_spin_lock *lock)
250 arch_spinlock_t *l = (void *)lock;
253 arch_spinlock_t lock;
254 } u = { .lock = __ARCH_SPIN_LOCK_UNLOCKED };
256 compiletime_assert(u.val == 0, "__ARCH_SPIN_LOCK_UNLOCKED not 0");
257 BUILD_BUG_ON(sizeof(*l) != sizeof(__u32));
258 BUILD_BUG_ON(sizeof(*lock) != sizeof(__u32));
262 static inline void __bpf_spin_unlock(struct bpf_spin_lock *lock)
264 arch_spinlock_t *l = (void *)lock;
271 static inline void __bpf_spin_lock(struct bpf_spin_lock *lock)
273 atomic_t *l = (void *)lock;
275 BUILD_BUG_ON(sizeof(*l) != sizeof(*lock));
277 atomic_cond_read_relaxed(l, !VAL);
278 } while (atomic_xchg(l, 1));
281 static inline void __bpf_spin_unlock(struct bpf_spin_lock *lock)
283 atomic_t *l = (void *)lock;
285 atomic_set_release(l, 0);
290 static DEFINE_PER_CPU(unsigned long, irqsave_flags);
292 notrace BPF_CALL_1(bpf_spin_lock, struct bpf_spin_lock *, lock)
296 local_irq_save(flags);
297 __bpf_spin_lock(lock);
298 __this_cpu_write(irqsave_flags, flags);
302 const struct bpf_func_proto bpf_spin_lock_proto = {
303 .func = bpf_spin_lock,
305 .ret_type = RET_VOID,
306 .arg1_type = ARG_PTR_TO_SPIN_LOCK,
309 notrace BPF_CALL_1(bpf_spin_unlock, struct bpf_spin_lock *, lock)
313 flags = __this_cpu_read(irqsave_flags);
314 __bpf_spin_unlock(lock);
315 local_irq_restore(flags);
319 const struct bpf_func_proto bpf_spin_unlock_proto = {
320 .func = bpf_spin_unlock,
322 .ret_type = RET_VOID,
323 .arg1_type = ARG_PTR_TO_SPIN_LOCK,
326 void copy_map_value_locked(struct bpf_map *map, void *dst, void *src,
329 struct bpf_spin_lock *lock;
332 lock = src + map->spin_lock_off;
334 lock = dst + map->spin_lock_off;
336 ____bpf_spin_lock(lock);
337 copy_map_value(map, dst, src);
338 ____bpf_spin_unlock(lock);
342 BPF_CALL_0(bpf_jiffies64)
344 return get_jiffies_64();
347 const struct bpf_func_proto bpf_jiffies64_proto = {
348 .func = bpf_jiffies64,
350 .ret_type = RET_INTEGER,
353 #ifdef CONFIG_CGROUPS
354 BPF_CALL_0(bpf_get_current_cgroup_id)
360 cgrp = task_dfl_cgroup(current);
361 cgrp_id = cgroup_id(cgrp);
367 const struct bpf_func_proto bpf_get_current_cgroup_id_proto = {
368 .func = bpf_get_current_cgroup_id,
370 .ret_type = RET_INTEGER,
373 BPF_CALL_1(bpf_get_current_ancestor_cgroup_id, int, ancestor_level)
376 struct cgroup *ancestor;
380 cgrp = task_dfl_cgroup(current);
381 ancestor = cgroup_ancestor(cgrp, ancestor_level);
382 cgrp_id = ancestor ? cgroup_id(ancestor) : 0;
388 const struct bpf_func_proto bpf_get_current_ancestor_cgroup_id_proto = {
389 .func = bpf_get_current_ancestor_cgroup_id,
391 .ret_type = RET_INTEGER,
392 .arg1_type = ARG_ANYTHING,
395 #ifdef CONFIG_CGROUP_BPF
396 DECLARE_PER_CPU(struct bpf_cgroup_storage_info,
397 bpf_cgroup_storage_info[BPF_CGROUP_STORAGE_NEST_MAX]);
399 BPF_CALL_2(bpf_get_local_storage, struct bpf_map *, map, u64, flags)
401 /* flags argument is not used now,
402 * but provides an ability to extend the API.
403 * verifier checks that its value is correct.
405 enum bpf_cgroup_storage_type stype = cgroup_storage_type(map);
406 struct bpf_cgroup_storage *storage = NULL;
410 for (i = BPF_CGROUP_STORAGE_NEST_MAX - 1; i >= 0; i--) {
411 if (likely(this_cpu_read(bpf_cgroup_storage_info[i].task) != current))
414 storage = this_cpu_read(bpf_cgroup_storage_info[i].storage[stype]);
418 if (stype == BPF_CGROUP_STORAGE_SHARED)
419 ptr = &READ_ONCE(storage->buf)->data[0];
421 ptr = this_cpu_ptr(storage->percpu_buf);
423 return (unsigned long)ptr;
426 const struct bpf_func_proto bpf_get_local_storage_proto = {
427 .func = bpf_get_local_storage,
429 .ret_type = RET_PTR_TO_MAP_VALUE,
430 .arg1_type = ARG_CONST_MAP_PTR,
431 .arg2_type = ARG_ANYTHING,
435 #define BPF_STRTOX_BASE_MASK 0x1F
437 static int __bpf_strtoull(const char *buf, size_t buf_len, u64 flags,
438 unsigned long long *res, bool *is_negative)
440 unsigned int base = flags & BPF_STRTOX_BASE_MASK;
441 const char *cur_buf = buf;
442 size_t cur_len = buf_len;
443 unsigned int consumed;
447 if (!buf || !buf_len || !res || !is_negative)
450 if (base != 0 && base != 8 && base != 10 && base != 16)
453 if (flags & ~BPF_STRTOX_BASE_MASK)
456 while (cur_buf < buf + buf_len && isspace(*cur_buf))
459 *is_negative = (cur_buf < buf + buf_len && *cur_buf == '-');
463 consumed = cur_buf - buf;
468 cur_len = min(cur_len, sizeof(str) - 1);
469 memcpy(str, cur_buf, cur_len);
473 cur_buf = _parse_integer_fixup_radix(cur_buf, &base);
474 val_len = _parse_integer(cur_buf, base, res);
476 if (val_len & KSTRTOX_OVERFLOW)
483 consumed += cur_buf - str;
488 static int __bpf_strtoll(const char *buf, size_t buf_len, u64 flags,
491 unsigned long long _res;
495 err = __bpf_strtoull(buf, buf_len, flags, &_res, &is_negative);
499 if ((long long)-_res > 0)
503 if ((long long)_res < 0)
510 BPF_CALL_4(bpf_strtol, const char *, buf, size_t, buf_len, u64, flags,
516 err = __bpf_strtoll(buf, buf_len, flags, &_res);
519 if (_res != (long)_res)
525 const struct bpf_func_proto bpf_strtol_proto = {
528 .ret_type = RET_INTEGER,
529 .arg1_type = ARG_PTR_TO_MEM,
530 .arg2_type = ARG_CONST_SIZE,
531 .arg3_type = ARG_ANYTHING,
532 .arg4_type = ARG_PTR_TO_LONG,
535 BPF_CALL_4(bpf_strtoul, const char *, buf, size_t, buf_len, u64, flags,
536 unsigned long *, res)
538 unsigned long long _res;
542 err = __bpf_strtoull(buf, buf_len, flags, &_res, &is_negative);
547 if (_res != (unsigned long)_res)
553 const struct bpf_func_proto bpf_strtoul_proto = {
556 .ret_type = RET_INTEGER,
557 .arg1_type = ARG_PTR_TO_MEM,
558 .arg2_type = ARG_CONST_SIZE,
559 .arg3_type = ARG_ANYTHING,
560 .arg4_type = ARG_PTR_TO_LONG,
564 BPF_CALL_4(bpf_get_ns_current_pid_tgid, u64, dev, u64, ino,
565 struct bpf_pidns_info *, nsdata, u32, size)
567 struct task_struct *task = current;
568 struct pid_namespace *pidns;
571 if (unlikely(size != sizeof(struct bpf_pidns_info)))
574 if (unlikely((u64)(dev_t)dev != dev))
580 pidns = task_active_pid_ns(task);
581 if (unlikely(!pidns)) {
586 if (!ns_match(&pidns->ns, (dev_t)dev, ino))
589 nsdata->pid = task_pid_nr_ns(task, pidns);
590 nsdata->tgid = task_tgid_nr_ns(task, pidns);
593 memset((void *)nsdata, 0, (size_t) size);
597 const struct bpf_func_proto bpf_get_ns_current_pid_tgid_proto = {
598 .func = bpf_get_ns_current_pid_tgid,
600 .ret_type = RET_INTEGER,
601 .arg1_type = ARG_ANYTHING,
602 .arg2_type = ARG_ANYTHING,
603 .arg3_type = ARG_PTR_TO_UNINIT_MEM,
604 .arg4_type = ARG_CONST_SIZE,
607 static const struct bpf_func_proto bpf_get_raw_smp_processor_id_proto = {
608 .func = bpf_get_raw_cpu_id,
610 .ret_type = RET_INTEGER,
613 BPF_CALL_5(bpf_event_output_data, void *, ctx, struct bpf_map *, map,
614 u64, flags, void *, data, u64, size)
616 if (unlikely(flags & ~(BPF_F_INDEX_MASK)))
619 return bpf_event_output(map, flags, data, size, NULL, 0, NULL);
622 const struct bpf_func_proto bpf_event_output_data_proto = {
623 .func = bpf_event_output_data,
625 .ret_type = RET_INTEGER,
626 .arg1_type = ARG_PTR_TO_CTX,
627 .arg2_type = ARG_CONST_MAP_PTR,
628 .arg3_type = ARG_ANYTHING,
629 .arg4_type = ARG_PTR_TO_MEM,
630 .arg5_type = ARG_CONST_SIZE_OR_ZERO,
633 BPF_CALL_3(bpf_copy_from_user, void *, dst, u32, size,
634 const void __user *, user_ptr)
636 int ret = copy_from_user(dst, user_ptr, size);
639 memset(dst, 0, size);
646 const struct bpf_func_proto bpf_copy_from_user_proto = {
647 .func = bpf_copy_from_user,
649 .ret_type = RET_INTEGER,
650 .arg1_type = ARG_PTR_TO_UNINIT_MEM,
651 .arg2_type = ARG_CONST_SIZE_OR_ZERO,
652 .arg3_type = ARG_ANYTHING,
655 BPF_CALL_2(bpf_per_cpu_ptr, const void *, ptr, u32, cpu)
657 if (cpu >= nr_cpu_ids)
658 return (unsigned long)NULL;
660 return (unsigned long)per_cpu_ptr((const void __percpu *)ptr, cpu);
663 const struct bpf_func_proto bpf_per_cpu_ptr_proto = {
664 .func = bpf_per_cpu_ptr,
666 .ret_type = RET_PTR_TO_MEM_OR_BTF_ID_OR_NULL,
667 .arg1_type = ARG_PTR_TO_PERCPU_BTF_ID,
668 .arg2_type = ARG_ANYTHING,
671 BPF_CALL_1(bpf_this_cpu_ptr, const void *, percpu_ptr)
673 return (unsigned long)this_cpu_ptr((const void __percpu *)percpu_ptr);
676 const struct bpf_func_proto bpf_this_cpu_ptr_proto = {
677 .func = bpf_this_cpu_ptr,
679 .ret_type = RET_PTR_TO_MEM_OR_BTF_ID,
680 .arg1_type = ARG_PTR_TO_PERCPU_BTF_ID,
683 static int bpf_trace_copy_string(char *buf, void *unsafe_ptr, char fmt_ptype,
686 void __user *user_ptr = (__force void __user *)unsafe_ptr;
692 #ifdef CONFIG_ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE
693 if ((unsigned long)unsafe_ptr < TASK_SIZE)
694 return strncpy_from_user_nofault(buf, user_ptr, bufsz);
698 return strncpy_from_kernel_nofault(buf, unsafe_ptr, bufsz);
700 return strncpy_from_user_nofault(buf, user_ptr, bufsz);
706 /* Per-cpu temp buffers used by printf-like helpers to store the bprintf binary
707 * arguments representation.
709 #define MAX_BPRINTF_BUF_LEN 512
711 /* Support executing three nested bprintf helper calls on a given CPU */
712 #define MAX_BPRINTF_NEST_LEVEL 3
713 struct bpf_bprintf_buffers {
714 char tmp_bufs[MAX_BPRINTF_NEST_LEVEL][MAX_BPRINTF_BUF_LEN];
716 static DEFINE_PER_CPU(struct bpf_bprintf_buffers, bpf_bprintf_bufs);
717 static DEFINE_PER_CPU(int, bpf_bprintf_nest_level);
719 static int try_get_fmt_tmp_buf(char **tmp_buf)
721 struct bpf_bprintf_buffers *bufs;
725 nest_level = this_cpu_inc_return(bpf_bprintf_nest_level);
726 if (WARN_ON_ONCE(nest_level > MAX_BPRINTF_NEST_LEVEL)) {
727 this_cpu_dec(bpf_bprintf_nest_level);
731 bufs = this_cpu_ptr(&bpf_bprintf_bufs);
732 *tmp_buf = bufs->tmp_bufs[nest_level - 1];
737 void bpf_bprintf_cleanup(void)
739 if (this_cpu_read(bpf_bprintf_nest_level)) {
740 this_cpu_dec(bpf_bprintf_nest_level);
746 * bpf_bprintf_prepare - Generic pass on format strings for bprintf-like helpers
748 * Returns a negative value if fmt is an invalid format string or 0 otherwise.
750 * This can be used in two ways:
751 * - Format string verification only: when bin_args is NULL
752 * - Arguments preparation: in addition to the above verification, it writes in
753 * bin_args a binary representation of arguments usable by bstr_printf where
754 * pointers from BPF have been sanitized.
756 * In argument preparation mode, if 0 is returned, safe temporary buffers are
757 * allocated and bpf_bprintf_cleanup should be called to free them after use.
759 int bpf_bprintf_prepare(char *fmt, u32 fmt_size, const u64 *raw_args,
760 u32 **bin_args, u32 num_args)
762 char *unsafe_ptr = NULL, *tmp_buf = NULL, *tmp_buf_end, *fmt_end;
763 size_t sizeof_cur_arg, sizeof_cur_ip;
764 int err, i, num_spec = 0;
766 char fmt_ptype, cur_ip[16], ip_spec[] = "%pXX";
768 fmt_end = strnchr(fmt, fmt_size, 0);
771 fmt_size = fmt_end - fmt;
774 if (num_args && try_get_fmt_tmp_buf(&tmp_buf))
777 tmp_buf_end = tmp_buf + MAX_BPRINTF_BUF_LEN;
778 *bin_args = (u32 *)tmp_buf;
781 for (i = 0; i < fmt_size; i++) {
782 if ((!isprint(fmt[i]) && !isspace(fmt[i])) || !isascii(fmt[i])) {
790 if (fmt[i + 1] == '%') {
795 if (num_spec >= num_args) {
800 /* The string is zero-terminated so if fmt[i] != 0, we can
801 * always access fmt[i + 1], in the worst case it will be a 0
805 /* skip optional "[0 +-][num]" width formatting field */
806 while (fmt[i] == '0' || fmt[i] == '+' || fmt[i] == '-' ||
809 if (fmt[i] >= '1' && fmt[i] <= '9') {
811 while (fmt[i] >= '0' && fmt[i] <= '9')
816 sizeof_cur_arg = sizeof(long);
818 if ((fmt[i + 1] == 'k' || fmt[i + 1] == 'u') &&
820 fmt_ptype = fmt[i + 1];
825 if (fmt[i + 1] == 0 || isspace(fmt[i + 1]) ||
826 ispunct(fmt[i + 1]) || fmt[i + 1] == 'K' ||
827 fmt[i + 1] == 'x' || fmt[i + 1] == 's' ||
829 /* just kernel pointers */
831 cur_arg = raw_args[num_spec];
836 if (fmt[i + 1] == 'B') {
838 err = snprintf(tmp_buf,
839 (tmp_buf_end - tmp_buf),
841 (void *)(long)raw_args[num_spec]);
842 tmp_buf += (err + 1);
850 /* only support "%pI4", "%pi4", "%pI6" and "%pi6". */
851 if ((fmt[i + 1] != 'i' && fmt[i + 1] != 'I') ||
852 (fmt[i + 2] != '4' && fmt[i + 2] != '6')) {
861 sizeof_cur_ip = (fmt[i] == '4') ? 4 : 16;
862 if (tmp_buf_end - tmp_buf < sizeof_cur_ip) {
867 unsafe_ptr = (char *)(long)raw_args[num_spec];
868 err = copy_from_kernel_nofault(cur_ip, unsafe_ptr,
871 memset(cur_ip, 0, sizeof_cur_ip);
873 /* hack: bstr_printf expects IP addresses to be
874 * pre-formatted as strings, ironically, the easiest way
875 * to do that is to call snprintf.
877 ip_spec[2] = fmt[i - 1];
879 err = snprintf(tmp_buf, tmp_buf_end - tmp_buf,
886 } else if (fmt[i] == 's') {
889 if (fmt[i + 1] != 0 &&
890 !isspace(fmt[i + 1]) &&
891 !ispunct(fmt[i + 1])) {
899 if (tmp_buf_end == tmp_buf) {
904 unsafe_ptr = (char *)(long)raw_args[num_spec];
905 err = bpf_trace_copy_string(tmp_buf, unsafe_ptr,
907 tmp_buf_end - tmp_buf);
919 sizeof_cur_arg = sizeof(int);
922 sizeof_cur_arg = sizeof(long);
926 sizeof_cur_arg = sizeof(long long);
930 if (fmt[i] != 'i' && fmt[i] != 'd' && fmt[i] != 'u' &&
931 fmt[i] != 'x' && fmt[i] != 'X') {
937 cur_arg = raw_args[num_spec];
940 tmp_buf = PTR_ALIGN(tmp_buf, sizeof(u32));
941 if (tmp_buf_end - tmp_buf < sizeof_cur_arg) {
946 if (sizeof_cur_arg == 8) {
947 *(u32 *)tmp_buf = *(u32 *)&cur_arg;
948 *(u32 *)(tmp_buf + 4) = *((u32 *)&cur_arg + 1);
950 *(u32 *)tmp_buf = (u32)(long)cur_arg;
952 tmp_buf += sizeof_cur_arg;
960 bpf_bprintf_cleanup();
964 #define MAX_SNPRINTF_VARARGS 12
966 BPF_CALL_5(bpf_snprintf, char *, str, u32, str_size, char *, fmt,
967 const void *, data, u32, data_len)
972 if (data_len % 8 || data_len > MAX_SNPRINTF_VARARGS * 8 ||
975 num_args = data_len / 8;
977 /* ARG_PTR_TO_CONST_STR guarantees that fmt is zero-terminated so we
978 * can safely give an unbounded size.
980 err = bpf_bprintf_prepare(fmt, UINT_MAX, data, &bin_args, num_args);
984 err = bstr_printf(str, str_size, fmt, bin_args);
986 bpf_bprintf_cleanup();
991 const struct bpf_func_proto bpf_snprintf_proto = {
992 .func = bpf_snprintf,
994 .ret_type = RET_INTEGER,
995 .arg1_type = ARG_PTR_TO_MEM_OR_NULL,
996 .arg2_type = ARG_CONST_SIZE_OR_ZERO,
997 .arg3_type = ARG_PTR_TO_CONST_STR,
998 .arg4_type = ARG_PTR_TO_MEM_OR_NULL,
999 .arg5_type = ARG_CONST_SIZE_OR_ZERO,
1002 const struct bpf_func_proto bpf_get_current_task_proto __weak;
1003 const struct bpf_func_proto bpf_probe_read_user_proto __weak;
1004 const struct bpf_func_proto bpf_probe_read_user_str_proto __weak;
1005 const struct bpf_func_proto bpf_probe_read_kernel_proto __weak;
1006 const struct bpf_func_proto bpf_probe_read_kernel_str_proto __weak;
1008 const struct bpf_func_proto *
1009 bpf_base_func_proto(enum bpf_func_id func_id)
1012 case BPF_FUNC_map_lookup_elem:
1013 return &bpf_map_lookup_elem_proto;
1014 case BPF_FUNC_map_update_elem:
1015 return &bpf_map_update_elem_proto;
1016 case BPF_FUNC_map_delete_elem:
1017 return &bpf_map_delete_elem_proto;
1018 case BPF_FUNC_map_push_elem:
1019 return &bpf_map_push_elem_proto;
1020 case BPF_FUNC_map_pop_elem:
1021 return &bpf_map_pop_elem_proto;
1022 case BPF_FUNC_map_peek_elem:
1023 return &bpf_map_peek_elem_proto;
1024 case BPF_FUNC_get_prandom_u32:
1025 return &bpf_get_prandom_u32_proto;
1026 case BPF_FUNC_get_smp_processor_id:
1027 return &bpf_get_raw_smp_processor_id_proto;
1028 case BPF_FUNC_get_numa_node_id:
1029 return &bpf_get_numa_node_id_proto;
1030 case BPF_FUNC_tail_call:
1031 return &bpf_tail_call_proto;
1032 case BPF_FUNC_ktime_get_ns:
1033 return &bpf_ktime_get_ns_proto;
1034 case BPF_FUNC_ktime_get_boot_ns:
1035 return &bpf_ktime_get_boot_ns_proto;
1036 case BPF_FUNC_ktime_get_coarse_ns:
1037 return &bpf_ktime_get_coarse_ns_proto;
1038 case BPF_FUNC_ringbuf_output:
1039 return &bpf_ringbuf_output_proto;
1040 case BPF_FUNC_ringbuf_reserve:
1041 return &bpf_ringbuf_reserve_proto;
1042 case BPF_FUNC_ringbuf_submit:
1043 return &bpf_ringbuf_submit_proto;
1044 case BPF_FUNC_ringbuf_discard:
1045 return &bpf_ringbuf_discard_proto;
1046 case BPF_FUNC_ringbuf_query:
1047 return &bpf_ringbuf_query_proto;
1048 case BPF_FUNC_for_each_map_elem:
1049 return &bpf_for_each_map_elem_proto;
1058 case BPF_FUNC_spin_lock:
1059 return &bpf_spin_lock_proto;
1060 case BPF_FUNC_spin_unlock:
1061 return &bpf_spin_unlock_proto;
1062 case BPF_FUNC_jiffies64:
1063 return &bpf_jiffies64_proto;
1064 case BPF_FUNC_per_cpu_ptr:
1065 return &bpf_per_cpu_ptr_proto;
1066 case BPF_FUNC_this_cpu_ptr:
1067 return &bpf_this_cpu_ptr_proto;
1072 if (!perfmon_capable())
1076 case BPF_FUNC_trace_printk:
1077 return bpf_get_trace_printk_proto();
1078 case BPF_FUNC_get_current_task:
1079 return &bpf_get_current_task_proto;
1080 case BPF_FUNC_probe_read_user:
1081 return &bpf_probe_read_user_proto;
1082 case BPF_FUNC_probe_read_kernel:
1083 return security_locked_down(LOCKDOWN_BPF_READ_KERNEL) < 0 ?
1084 NULL : &bpf_probe_read_kernel_proto;
1085 case BPF_FUNC_probe_read_user_str:
1086 return &bpf_probe_read_user_str_proto;
1087 case BPF_FUNC_probe_read_kernel_str:
1088 return security_locked_down(LOCKDOWN_BPF_READ_KERNEL) < 0 ?
1089 NULL : &bpf_probe_read_kernel_str_proto;
1090 case BPF_FUNC_snprintf_btf:
1091 return &bpf_snprintf_btf_proto;
1092 case BPF_FUNC_snprintf:
1093 return &bpf_snprintf_proto;