Thomas Gleixner | 5b497af | 2019-05-29 07:18:09 -0700 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0-only |
Alexei Starovoitov | d0003ec | 2014-11-13 17:36:49 -0800 | [diff] [blame] | 2 | /* Copyright (c) 2011-2014 PLUMgrid, http://plumgrid.com |
Alexei Starovoitov | d0003ec | 2014-11-13 17:36:49 -0800 | [diff] [blame] | 3 | */ |
| 4 | #include <linux/bpf.h> |
| 5 | #include <linux/rcupdate.h> |
Daniel Borkmann | 03e69b5 | 2015-03-14 02:27:16 +0100 | [diff] [blame] | 6 | #include <linux/random.h> |
Daniel Borkmann | c04167c | 2015-03-14 02:27:17 +0100 | [diff] [blame] | 7 | #include <linux/smp.h> |
Daniel Borkmann | 2d0e30c | 2016-10-21 12:46:33 +0200 | [diff] [blame] | 8 | #include <linux/topology.h> |
Daniel Borkmann | 17ca8cb | 2015-05-29 23:23:06 +0200 | [diff] [blame] | 9 | #include <linux/ktime.h> |
Alexei Starovoitov | ffeedaf | 2015-06-12 19:39:12 -0700 | [diff] [blame] | 10 | #include <linux/sched.h> |
| 11 | #include <linux/uidgid.h> |
Daniel Borkmann | f3694e0 | 2016-09-09 02:45:31 +0200 | [diff] [blame] | 12 | #include <linux/filter.h> |
Andrey Ignatov | d7a4cb9 | 2019-03-18 17:55:26 -0700 | [diff] [blame] | 13 | #include <linux/ctype.h> |
Martin KaFai Lau | 5576b99 | 2020-01-22 15:36:46 -0800 | [diff] [blame] | 14 | #include <linux/jiffies.h> |
Carlos Neira | b4490c5 | 2020-03-04 17:41:56 -0300 | [diff] [blame] | 15 | #include <linux/pid_namespace.h> |
| 16 | #include <linux/proc_ns.h> |
Daniel Borkmann | ff40e51 | 2021-05-28 09:16:31 +0000 | [diff] [blame] | 17 | #include <linux/security.h> |
Andrey Ignatov | d7a4cb9 | 2019-03-18 17:55:26 -0700 | [diff] [blame] | 18 | |
| 19 | #include "../../lib/kstrtox.h" |
Alexei Starovoitov | d0003ec | 2014-11-13 17:36:49 -0800 | [diff] [blame] | 20 | |
| 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 |
| 24 | * |
| 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. |
| 29 | */ |
Daniel Borkmann | f3694e0 | 2016-09-09 02:45:31 +0200 | [diff] [blame] | 30 | BPF_CALL_2(bpf_map_lookup_elem, struct bpf_map *, map, void *, key) |
Alexei Starovoitov | d0003ec | 2014-11-13 17:36:49 -0800 | [diff] [blame] | 31 | { |
Alexei Starovoitov | d0003ec | 2014-11-13 17:36:49 -0800 | [diff] [blame] | 32 | WARN_ON_ONCE(!rcu_read_lock_held()); |
Daniel Borkmann | f3694e0 | 2016-09-09 02:45:31 +0200 | [diff] [blame] | 33 | return (unsigned long) map->ops->map_lookup_elem(map, key); |
Alexei Starovoitov | d0003ec | 2014-11-13 17:36:49 -0800 | [diff] [blame] | 34 | } |
| 35 | |
Daniel Borkmann | a2c83ff | 2015-03-01 12:31:42 +0100 | [diff] [blame] | 36 | const struct bpf_func_proto bpf_map_lookup_elem_proto = { |
Daniel Borkmann | 3324b58 | 2015-05-29 23:23:07 +0200 | [diff] [blame] | 37 | .func = bpf_map_lookup_elem, |
| 38 | .gpl_only = false, |
Daniel Borkmann | 36bbef5 | 2016-09-20 00:26:13 +0200 | [diff] [blame] | 39 | .pkt_access = true, |
Daniel Borkmann | 3324b58 | 2015-05-29 23:23:07 +0200 | [diff] [blame] | 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, |
Alexei Starovoitov | d0003ec | 2014-11-13 17:36:49 -0800 | [diff] [blame] | 43 | }; |
| 44 | |
Daniel Borkmann | f3694e0 | 2016-09-09 02:45:31 +0200 | [diff] [blame] | 45 | BPF_CALL_4(bpf_map_update_elem, struct bpf_map *, map, void *, key, |
| 46 | void *, value, u64, flags) |
Alexei Starovoitov | d0003ec | 2014-11-13 17:36:49 -0800 | [diff] [blame] | 47 | { |
Alexei Starovoitov | d0003ec | 2014-11-13 17:36:49 -0800 | [diff] [blame] | 48 | WARN_ON_ONCE(!rcu_read_lock_held()); |
Daniel Borkmann | f3694e0 | 2016-09-09 02:45:31 +0200 | [diff] [blame] | 49 | return map->ops->map_update_elem(map, key, value, flags); |
Alexei Starovoitov | d0003ec | 2014-11-13 17:36:49 -0800 | [diff] [blame] | 50 | } |
| 51 | |
Daniel Borkmann | a2c83ff | 2015-03-01 12:31:42 +0100 | [diff] [blame] | 52 | const struct bpf_func_proto bpf_map_update_elem_proto = { |
Daniel Borkmann | 3324b58 | 2015-05-29 23:23:07 +0200 | [diff] [blame] | 53 | .func = bpf_map_update_elem, |
| 54 | .gpl_only = false, |
Daniel Borkmann | 36bbef5 | 2016-09-20 00:26:13 +0200 | [diff] [blame] | 55 | .pkt_access = true, |
Daniel Borkmann | 3324b58 | 2015-05-29 23:23:07 +0200 | [diff] [blame] | 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, |
Alexei Starovoitov | d0003ec | 2014-11-13 17:36:49 -0800 | [diff] [blame] | 61 | }; |
| 62 | |
Daniel Borkmann | f3694e0 | 2016-09-09 02:45:31 +0200 | [diff] [blame] | 63 | BPF_CALL_2(bpf_map_delete_elem, struct bpf_map *, map, void *, key) |
Alexei Starovoitov | d0003ec | 2014-11-13 17:36:49 -0800 | [diff] [blame] | 64 | { |
Alexei Starovoitov | d0003ec | 2014-11-13 17:36:49 -0800 | [diff] [blame] | 65 | WARN_ON_ONCE(!rcu_read_lock_held()); |
Alexei Starovoitov | d0003ec | 2014-11-13 17:36:49 -0800 | [diff] [blame] | 66 | return map->ops->map_delete_elem(map, key); |
| 67 | } |
| 68 | |
Daniel Borkmann | a2c83ff | 2015-03-01 12:31:42 +0100 | [diff] [blame] | 69 | const struct bpf_func_proto bpf_map_delete_elem_proto = { |
Daniel Borkmann | 3324b58 | 2015-05-29 23:23:07 +0200 | [diff] [blame] | 70 | .func = bpf_map_delete_elem, |
| 71 | .gpl_only = false, |
Daniel Borkmann | 36bbef5 | 2016-09-20 00:26:13 +0200 | [diff] [blame] | 72 | .pkt_access = true, |
Daniel Borkmann | 3324b58 | 2015-05-29 23:23:07 +0200 | [diff] [blame] | 73 | .ret_type = RET_INTEGER, |
| 74 | .arg1_type = ARG_CONST_MAP_PTR, |
| 75 | .arg2_type = ARG_PTR_TO_MAP_KEY, |
Alexei Starovoitov | d0003ec | 2014-11-13 17:36:49 -0800 | [diff] [blame] | 76 | }; |
Daniel Borkmann | 03e69b5 | 2015-03-14 02:27:16 +0100 | [diff] [blame] | 77 | |
Mauricio Vasquez B | f1a2e44 | 2018-10-18 15:16:25 +0200 | [diff] [blame] | 78 | BPF_CALL_3(bpf_map_push_elem, struct bpf_map *, map, void *, value, u64, flags) |
| 79 | { |
| 80 | return map->ops->map_push_elem(map, value, flags); |
| 81 | } |
| 82 | |
| 83 | const struct bpf_func_proto bpf_map_push_elem_proto = { |
| 84 | .func = bpf_map_push_elem, |
| 85 | .gpl_only = false, |
| 86 | .pkt_access = true, |
| 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, |
| 91 | }; |
| 92 | |
| 93 | BPF_CALL_2(bpf_map_pop_elem, struct bpf_map *, map, void *, value) |
| 94 | { |
| 95 | return map->ops->map_pop_elem(map, value); |
| 96 | } |
| 97 | |
| 98 | const struct bpf_func_proto bpf_map_pop_elem_proto = { |
| 99 | .func = bpf_map_pop_elem, |
| 100 | .gpl_only = false, |
Mauricio Vasquez B | f1a2e44 | 2018-10-18 15:16:25 +0200 | [diff] [blame] | 101 | .ret_type = RET_INTEGER, |
| 102 | .arg1_type = ARG_CONST_MAP_PTR, |
| 103 | .arg2_type = ARG_PTR_TO_UNINIT_MAP_VALUE, |
| 104 | }; |
| 105 | |
| 106 | BPF_CALL_2(bpf_map_peek_elem, struct bpf_map *, map, void *, value) |
| 107 | { |
| 108 | return map->ops->map_peek_elem(map, value); |
| 109 | } |
| 110 | |
| 111 | const struct bpf_func_proto bpf_map_peek_elem_proto = { |
Mircea Cirjaliu | 301a33d | 2021-01-19 21:53:18 +0100 | [diff] [blame] | 112 | .func = bpf_map_peek_elem, |
Mauricio Vasquez B | f1a2e44 | 2018-10-18 15:16:25 +0200 | [diff] [blame] | 113 | .gpl_only = false, |
Mauricio Vasquez B | f1a2e44 | 2018-10-18 15:16:25 +0200 | [diff] [blame] | 114 | .ret_type = RET_INTEGER, |
| 115 | .arg1_type = ARG_CONST_MAP_PTR, |
| 116 | .arg2_type = ARG_PTR_TO_UNINIT_MAP_VALUE, |
| 117 | }; |
| 118 | |
Daniel Borkmann | 03e69b5 | 2015-03-14 02:27:16 +0100 | [diff] [blame] | 119 | const struct bpf_func_proto bpf_get_prandom_u32_proto = { |
Daniel Borkmann | 3ad0040 | 2015-10-08 01:20:39 +0200 | [diff] [blame] | 120 | .func = bpf_user_rnd_u32, |
Daniel Borkmann | 03e69b5 | 2015-03-14 02:27:16 +0100 | [diff] [blame] | 121 | .gpl_only = false, |
| 122 | .ret_type = RET_INTEGER, |
| 123 | }; |
Daniel Borkmann | c04167c | 2015-03-14 02:27:17 +0100 | [diff] [blame] | 124 | |
Daniel Borkmann | f3694e0 | 2016-09-09 02:45:31 +0200 | [diff] [blame] | 125 | BPF_CALL_0(bpf_get_smp_processor_id) |
Daniel Borkmann | c04167c | 2015-03-14 02:27:17 +0100 | [diff] [blame] | 126 | { |
Daniel Borkmann | 80b48c4 | 2016-06-28 12:18:26 +0200 | [diff] [blame] | 127 | return smp_processor_id(); |
Daniel Borkmann | c04167c | 2015-03-14 02:27:17 +0100 | [diff] [blame] | 128 | } |
| 129 | |
| 130 | const struct bpf_func_proto bpf_get_smp_processor_id_proto = { |
| 131 | .func = bpf_get_smp_processor_id, |
| 132 | .gpl_only = false, |
| 133 | .ret_type = RET_INTEGER, |
| 134 | }; |
Daniel Borkmann | 17ca8cb | 2015-05-29 23:23:06 +0200 | [diff] [blame] | 135 | |
Daniel Borkmann | 2d0e30c | 2016-10-21 12:46:33 +0200 | [diff] [blame] | 136 | BPF_CALL_0(bpf_get_numa_node_id) |
| 137 | { |
| 138 | return numa_node_id(); |
| 139 | } |
| 140 | |
| 141 | const struct bpf_func_proto bpf_get_numa_node_id_proto = { |
| 142 | .func = bpf_get_numa_node_id, |
| 143 | .gpl_only = false, |
| 144 | .ret_type = RET_INTEGER, |
| 145 | }; |
| 146 | |
Daniel Borkmann | f3694e0 | 2016-09-09 02:45:31 +0200 | [diff] [blame] | 147 | BPF_CALL_0(bpf_ktime_get_ns) |
Daniel Borkmann | 17ca8cb | 2015-05-29 23:23:06 +0200 | [diff] [blame] | 148 | { |
| 149 | /* NMI safe access to clock monotonic */ |
| 150 | return ktime_get_mono_fast_ns(); |
| 151 | } |
| 152 | |
| 153 | const struct bpf_func_proto bpf_ktime_get_ns_proto = { |
| 154 | .func = bpf_ktime_get_ns, |
Maciej Żenczykowski | 082b57e | 2020-04-20 11:47:50 -0700 | [diff] [blame] | 155 | .gpl_only = false, |
Daniel Borkmann | 17ca8cb | 2015-05-29 23:23:06 +0200 | [diff] [blame] | 156 | .ret_type = RET_INTEGER, |
| 157 | }; |
Alexei Starovoitov | ffeedaf | 2015-06-12 19:39:12 -0700 | [diff] [blame] | 158 | |
Maciej Żenczykowski | 71d1921 | 2020-04-26 09:15:25 -0700 | [diff] [blame] | 159 | BPF_CALL_0(bpf_ktime_get_boot_ns) |
| 160 | { |
| 161 | /* NMI safe access to clock boottime */ |
| 162 | return ktime_get_boot_fast_ns(); |
| 163 | } |
| 164 | |
| 165 | const struct bpf_func_proto bpf_ktime_get_boot_ns_proto = { |
| 166 | .func = bpf_ktime_get_boot_ns, |
| 167 | .gpl_only = false, |
| 168 | .ret_type = RET_INTEGER, |
| 169 | }; |
| 170 | |
Dmitrii Banshchikov | d055126 | 2020-11-17 18:45:49 +0000 | [diff] [blame] | 171 | BPF_CALL_0(bpf_ktime_get_coarse_ns) |
| 172 | { |
| 173 | return ktime_get_coarse_ns(); |
| 174 | } |
| 175 | |
| 176 | const struct bpf_func_proto bpf_ktime_get_coarse_ns_proto = { |
| 177 | .func = bpf_ktime_get_coarse_ns, |
| 178 | .gpl_only = false, |
| 179 | .ret_type = RET_INTEGER, |
| 180 | }; |
| 181 | |
Daniel Borkmann | f3694e0 | 2016-09-09 02:45:31 +0200 | [diff] [blame] | 182 | BPF_CALL_0(bpf_get_current_pid_tgid) |
Alexei Starovoitov | ffeedaf | 2015-06-12 19:39:12 -0700 | [diff] [blame] | 183 | { |
| 184 | struct task_struct *task = current; |
| 185 | |
Daniel Borkmann | 6088b58 | 2016-09-09 02:45:28 +0200 | [diff] [blame] | 186 | if (unlikely(!task)) |
Alexei Starovoitov | ffeedaf | 2015-06-12 19:39:12 -0700 | [diff] [blame] | 187 | return -EINVAL; |
| 188 | |
| 189 | return (u64) task->tgid << 32 | task->pid; |
| 190 | } |
| 191 | |
| 192 | const struct bpf_func_proto bpf_get_current_pid_tgid_proto = { |
| 193 | .func = bpf_get_current_pid_tgid, |
| 194 | .gpl_only = false, |
| 195 | .ret_type = RET_INTEGER, |
| 196 | }; |
| 197 | |
Daniel Borkmann | f3694e0 | 2016-09-09 02:45:31 +0200 | [diff] [blame] | 198 | BPF_CALL_0(bpf_get_current_uid_gid) |
Alexei Starovoitov | ffeedaf | 2015-06-12 19:39:12 -0700 | [diff] [blame] | 199 | { |
| 200 | struct task_struct *task = current; |
| 201 | kuid_t uid; |
| 202 | kgid_t gid; |
| 203 | |
Daniel Borkmann | 6088b58 | 2016-09-09 02:45:28 +0200 | [diff] [blame] | 204 | if (unlikely(!task)) |
Alexei Starovoitov | ffeedaf | 2015-06-12 19:39:12 -0700 | [diff] [blame] | 205 | return -EINVAL; |
| 206 | |
| 207 | current_uid_gid(&uid, &gid); |
| 208 | return (u64) from_kgid(&init_user_ns, gid) << 32 | |
Daniel Borkmann | 6088b58 | 2016-09-09 02:45:28 +0200 | [diff] [blame] | 209 | from_kuid(&init_user_ns, uid); |
Alexei Starovoitov | ffeedaf | 2015-06-12 19:39:12 -0700 | [diff] [blame] | 210 | } |
| 211 | |
| 212 | const struct bpf_func_proto bpf_get_current_uid_gid_proto = { |
| 213 | .func = bpf_get_current_uid_gid, |
| 214 | .gpl_only = false, |
| 215 | .ret_type = RET_INTEGER, |
| 216 | }; |
| 217 | |
Daniel Borkmann | f3694e0 | 2016-09-09 02:45:31 +0200 | [diff] [blame] | 218 | BPF_CALL_2(bpf_get_current_comm, char *, buf, u32, size) |
Alexei Starovoitov | ffeedaf | 2015-06-12 19:39:12 -0700 | [diff] [blame] | 219 | { |
| 220 | struct task_struct *task = current; |
Alexei Starovoitov | ffeedaf | 2015-06-12 19:39:12 -0700 | [diff] [blame] | 221 | |
Daniel Borkmann | 074f528e | 2016-04-13 00:10:52 +0200 | [diff] [blame] | 222 | if (unlikely(!task)) |
| 223 | goto err_clear; |
Alexei Starovoitov | ffeedaf | 2015-06-12 19:39:12 -0700 | [diff] [blame] | 224 | |
Daniel Borkmann | 074f528e | 2016-04-13 00:10:52 +0200 | [diff] [blame] | 225 | strncpy(buf, task->comm, size); |
| 226 | |
| 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. |
| 230 | */ |
| 231 | buf[size - 1] = 0; |
Alexei Starovoitov | ffeedaf | 2015-06-12 19:39:12 -0700 | [diff] [blame] | 232 | return 0; |
Daniel Borkmann | 074f528e | 2016-04-13 00:10:52 +0200 | [diff] [blame] | 233 | err_clear: |
| 234 | memset(buf, 0, size); |
| 235 | return -EINVAL; |
Alexei Starovoitov | ffeedaf | 2015-06-12 19:39:12 -0700 | [diff] [blame] | 236 | } |
| 237 | |
| 238 | const struct bpf_func_proto bpf_get_current_comm_proto = { |
| 239 | .func = bpf_get_current_comm, |
| 240 | .gpl_only = false, |
| 241 | .ret_type = RET_INTEGER, |
Alexei Starovoitov | 39f19ebb | 2017-01-09 10:19:50 -0800 | [diff] [blame] | 242 | .arg1_type = ARG_PTR_TO_UNINIT_MEM, |
| 243 | .arg2_type = ARG_CONST_SIZE, |
Alexei Starovoitov | ffeedaf | 2015-06-12 19:39:12 -0700 | [diff] [blame] | 244 | }; |
Yonghong Song | bf6fa2c8 | 2018-06-03 15:59:41 -0700 | [diff] [blame] | 245 | |
Alexei Starovoitov | d83525c | 2019-01-31 15:40:04 -0800 | [diff] [blame] | 246 | #if defined(CONFIG_QUEUED_SPINLOCKS) || defined(CONFIG_BPF_ARCH_SPINLOCK) |
| 247 | |
| 248 | static inline void __bpf_spin_lock(struct bpf_spin_lock *lock) |
| 249 | { |
| 250 | arch_spinlock_t *l = (void *)lock; |
| 251 | union { |
| 252 | __u32 val; |
| 253 | arch_spinlock_t lock; |
| 254 | } u = { .lock = __ARCH_SPIN_LOCK_UNLOCKED }; |
| 255 | |
| 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)); |
| 259 | arch_spin_lock(l); |
| 260 | } |
| 261 | |
| 262 | static inline void __bpf_spin_unlock(struct bpf_spin_lock *lock) |
| 263 | { |
| 264 | arch_spinlock_t *l = (void *)lock; |
| 265 | |
| 266 | arch_spin_unlock(l); |
| 267 | } |
| 268 | |
| 269 | #else |
| 270 | |
| 271 | static inline void __bpf_spin_lock(struct bpf_spin_lock *lock) |
| 272 | { |
| 273 | atomic_t *l = (void *)lock; |
| 274 | |
| 275 | BUILD_BUG_ON(sizeof(*l) != sizeof(*lock)); |
| 276 | do { |
| 277 | atomic_cond_read_relaxed(l, !VAL); |
| 278 | } while (atomic_xchg(l, 1)); |
| 279 | } |
| 280 | |
| 281 | static inline void __bpf_spin_unlock(struct bpf_spin_lock *lock) |
| 282 | { |
| 283 | atomic_t *l = (void *)lock; |
| 284 | |
| 285 | atomic_set_release(l, 0); |
| 286 | } |
| 287 | |
| 288 | #endif |
| 289 | |
| 290 | static DEFINE_PER_CPU(unsigned long, irqsave_flags); |
| 291 | |
| 292 | notrace BPF_CALL_1(bpf_spin_lock, struct bpf_spin_lock *, lock) |
| 293 | { |
| 294 | unsigned long flags; |
| 295 | |
| 296 | local_irq_save(flags); |
| 297 | __bpf_spin_lock(lock); |
| 298 | __this_cpu_write(irqsave_flags, flags); |
| 299 | return 0; |
| 300 | } |
| 301 | |
| 302 | const struct bpf_func_proto bpf_spin_lock_proto = { |
| 303 | .func = bpf_spin_lock, |
| 304 | .gpl_only = false, |
| 305 | .ret_type = RET_VOID, |
| 306 | .arg1_type = ARG_PTR_TO_SPIN_LOCK, |
| 307 | }; |
| 308 | |
| 309 | notrace BPF_CALL_1(bpf_spin_unlock, struct bpf_spin_lock *, lock) |
| 310 | { |
| 311 | unsigned long flags; |
| 312 | |
| 313 | flags = __this_cpu_read(irqsave_flags); |
| 314 | __bpf_spin_unlock(lock); |
| 315 | local_irq_restore(flags); |
| 316 | return 0; |
| 317 | } |
| 318 | |
| 319 | const struct bpf_func_proto bpf_spin_unlock_proto = { |
| 320 | .func = bpf_spin_unlock, |
| 321 | .gpl_only = false, |
| 322 | .ret_type = RET_VOID, |
| 323 | .arg1_type = ARG_PTR_TO_SPIN_LOCK, |
| 324 | }; |
| 325 | |
Alexei Starovoitov | 96049f3 | 2019-01-31 15:40:09 -0800 | [diff] [blame] | 326 | void copy_map_value_locked(struct bpf_map *map, void *dst, void *src, |
| 327 | bool lock_src) |
| 328 | { |
| 329 | struct bpf_spin_lock *lock; |
| 330 | |
| 331 | if (lock_src) |
| 332 | lock = src + map->spin_lock_off; |
| 333 | else |
| 334 | lock = dst + map->spin_lock_off; |
| 335 | preempt_disable(); |
| 336 | ____bpf_spin_lock(lock); |
| 337 | copy_map_value(map, dst, src); |
| 338 | ____bpf_spin_unlock(lock); |
| 339 | preempt_enable(); |
| 340 | } |
| 341 | |
Martin KaFai Lau | 5576b99 | 2020-01-22 15:36:46 -0800 | [diff] [blame] | 342 | BPF_CALL_0(bpf_jiffies64) |
| 343 | { |
| 344 | return get_jiffies_64(); |
| 345 | } |
| 346 | |
| 347 | const struct bpf_func_proto bpf_jiffies64_proto = { |
| 348 | .func = bpf_jiffies64, |
| 349 | .gpl_only = false, |
| 350 | .ret_type = RET_INTEGER, |
| 351 | }; |
| 352 | |
Yonghong Song | bf6fa2c8 | 2018-06-03 15:59:41 -0700 | [diff] [blame] | 353 | #ifdef CONFIG_CGROUPS |
| 354 | BPF_CALL_0(bpf_get_current_cgroup_id) |
| 355 | { |
| 356 | struct cgroup *cgrp = task_dfl_cgroup(current); |
| 357 | |
Tejun Heo | 7432103 | 2019-11-04 15:54:30 -0800 | [diff] [blame] | 358 | return cgroup_id(cgrp); |
Yonghong Song | bf6fa2c8 | 2018-06-03 15:59:41 -0700 | [diff] [blame] | 359 | } |
| 360 | |
| 361 | const struct bpf_func_proto bpf_get_current_cgroup_id_proto = { |
| 362 | .func = bpf_get_current_cgroup_id, |
| 363 | .gpl_only = false, |
| 364 | .ret_type = RET_INTEGER, |
| 365 | }; |
Roman Gushchin | cd33943 | 2018-08-02 14:27:24 -0700 | [diff] [blame] | 366 | |
Daniel Borkmann | 0f09abd | 2020-03-27 16:58:54 +0100 | [diff] [blame] | 367 | BPF_CALL_1(bpf_get_current_ancestor_cgroup_id, int, ancestor_level) |
| 368 | { |
| 369 | struct cgroup *cgrp = task_dfl_cgroup(current); |
| 370 | struct cgroup *ancestor; |
| 371 | |
| 372 | ancestor = cgroup_ancestor(cgrp, ancestor_level); |
| 373 | if (!ancestor) |
| 374 | return 0; |
| 375 | return cgroup_id(ancestor); |
| 376 | } |
| 377 | |
| 378 | const struct bpf_func_proto bpf_get_current_ancestor_cgroup_id_proto = { |
| 379 | .func = bpf_get_current_ancestor_cgroup_id, |
| 380 | .gpl_only = false, |
| 381 | .ret_type = RET_INTEGER, |
| 382 | .arg1_type = ARG_ANYTHING, |
| 383 | }; |
| 384 | |
Roman Gushchin | 8bad74f | 2018-09-28 14:45:36 +0000 | [diff] [blame] | 385 | #ifdef CONFIG_CGROUP_BPF |
Yonghong Song | b910eaa | 2021-03-22 22:51:46 -0700 | [diff] [blame] | 386 | DECLARE_PER_CPU(struct bpf_cgroup_storage_info, |
| 387 | bpf_cgroup_storage_info[BPF_CGROUP_STORAGE_NEST_MAX]); |
Roman Gushchin | cd33943 | 2018-08-02 14:27:24 -0700 | [diff] [blame] | 388 | |
| 389 | BPF_CALL_2(bpf_get_local_storage, struct bpf_map *, map, u64, flags) |
| 390 | { |
Roman Gushchin | 8bad74f | 2018-09-28 14:45:36 +0000 | [diff] [blame] | 391 | /* flags argument is not used now, |
| 392 | * but provides an ability to extend the API. |
| 393 | * verifier checks that its value is correct. |
Roman Gushchin | cd33943 | 2018-08-02 14:27:24 -0700 | [diff] [blame] | 394 | */ |
Roman Gushchin | 8bad74f | 2018-09-28 14:45:36 +0000 | [diff] [blame] | 395 | enum bpf_cgroup_storage_type stype = cgroup_storage_type(map); |
Yonghong Song | b910eaa | 2021-03-22 22:51:46 -0700 | [diff] [blame] | 396 | struct bpf_cgroup_storage *storage = NULL; |
Roman Gushchin | b741f16 | 2018-09-28 14:45:43 +0000 | [diff] [blame] | 397 | void *ptr; |
Yonghong Song | b910eaa | 2021-03-22 22:51:46 -0700 | [diff] [blame] | 398 | int i; |
Roman Gushchin | 8bad74f | 2018-09-28 14:45:36 +0000 | [diff] [blame] | 399 | |
Yonghong Song | b910eaa | 2021-03-22 22:51:46 -0700 | [diff] [blame] | 400 | for (i = 0; i < BPF_CGROUP_STORAGE_NEST_MAX; i++) { |
| 401 | if (unlikely(this_cpu_read(bpf_cgroup_storage_info[i].task) != current)) |
| 402 | continue; |
| 403 | |
| 404 | storage = this_cpu_read(bpf_cgroup_storage_info[i].storage[stype]); |
| 405 | break; |
| 406 | } |
Roman Gushchin | f294b37 | 2018-09-28 14:45:40 +0000 | [diff] [blame] | 407 | |
Roman Gushchin | b741f16 | 2018-09-28 14:45:43 +0000 | [diff] [blame] | 408 | if (stype == BPF_CGROUP_STORAGE_SHARED) |
| 409 | ptr = &READ_ONCE(storage->buf)->data[0]; |
| 410 | else |
| 411 | ptr = this_cpu_ptr(storage->percpu_buf); |
| 412 | |
| 413 | return (unsigned long)ptr; |
Roman Gushchin | cd33943 | 2018-08-02 14:27:24 -0700 | [diff] [blame] | 414 | } |
| 415 | |
| 416 | const struct bpf_func_proto bpf_get_local_storage_proto = { |
| 417 | .func = bpf_get_local_storage, |
| 418 | .gpl_only = false, |
| 419 | .ret_type = RET_PTR_TO_MAP_VALUE, |
| 420 | .arg1_type = ARG_CONST_MAP_PTR, |
| 421 | .arg2_type = ARG_ANYTHING, |
| 422 | }; |
Yonghong Song | bf6fa2c8 | 2018-06-03 15:59:41 -0700 | [diff] [blame] | 423 | #endif |
Andrey Ignatov | d7a4cb9 | 2019-03-18 17:55:26 -0700 | [diff] [blame] | 424 | |
| 425 | #define BPF_STRTOX_BASE_MASK 0x1F |
| 426 | |
| 427 | static int __bpf_strtoull(const char *buf, size_t buf_len, u64 flags, |
| 428 | unsigned long long *res, bool *is_negative) |
| 429 | { |
| 430 | unsigned int base = flags & BPF_STRTOX_BASE_MASK; |
| 431 | const char *cur_buf = buf; |
| 432 | size_t cur_len = buf_len; |
| 433 | unsigned int consumed; |
| 434 | size_t val_len; |
| 435 | char str[64]; |
| 436 | |
| 437 | if (!buf || !buf_len || !res || !is_negative) |
| 438 | return -EINVAL; |
| 439 | |
| 440 | if (base != 0 && base != 8 && base != 10 && base != 16) |
| 441 | return -EINVAL; |
| 442 | |
| 443 | if (flags & ~BPF_STRTOX_BASE_MASK) |
| 444 | return -EINVAL; |
| 445 | |
| 446 | while (cur_buf < buf + buf_len && isspace(*cur_buf)) |
| 447 | ++cur_buf; |
| 448 | |
| 449 | *is_negative = (cur_buf < buf + buf_len && *cur_buf == '-'); |
| 450 | if (*is_negative) |
| 451 | ++cur_buf; |
| 452 | |
| 453 | consumed = cur_buf - buf; |
| 454 | cur_len -= consumed; |
| 455 | if (!cur_len) |
| 456 | return -EINVAL; |
| 457 | |
| 458 | cur_len = min(cur_len, sizeof(str) - 1); |
| 459 | memcpy(str, cur_buf, cur_len); |
| 460 | str[cur_len] = '\0'; |
| 461 | cur_buf = str; |
| 462 | |
| 463 | cur_buf = _parse_integer_fixup_radix(cur_buf, &base); |
| 464 | val_len = _parse_integer(cur_buf, base, res); |
| 465 | |
| 466 | if (val_len & KSTRTOX_OVERFLOW) |
| 467 | return -ERANGE; |
| 468 | |
| 469 | if (val_len == 0) |
| 470 | return -EINVAL; |
| 471 | |
| 472 | cur_buf += val_len; |
| 473 | consumed += cur_buf - str; |
| 474 | |
| 475 | return consumed; |
| 476 | } |
| 477 | |
| 478 | static int __bpf_strtoll(const char *buf, size_t buf_len, u64 flags, |
| 479 | long long *res) |
| 480 | { |
| 481 | unsigned long long _res; |
| 482 | bool is_negative; |
| 483 | int err; |
| 484 | |
| 485 | err = __bpf_strtoull(buf, buf_len, flags, &_res, &is_negative); |
| 486 | if (err < 0) |
| 487 | return err; |
| 488 | if (is_negative) { |
| 489 | if ((long long)-_res > 0) |
| 490 | return -ERANGE; |
| 491 | *res = -_res; |
| 492 | } else { |
| 493 | if ((long long)_res < 0) |
| 494 | return -ERANGE; |
| 495 | *res = _res; |
| 496 | } |
| 497 | return err; |
| 498 | } |
| 499 | |
| 500 | BPF_CALL_4(bpf_strtol, const char *, buf, size_t, buf_len, u64, flags, |
| 501 | long *, res) |
| 502 | { |
| 503 | long long _res; |
| 504 | int err; |
| 505 | |
| 506 | err = __bpf_strtoll(buf, buf_len, flags, &_res); |
| 507 | if (err < 0) |
| 508 | return err; |
| 509 | if (_res != (long)_res) |
| 510 | return -ERANGE; |
| 511 | *res = _res; |
| 512 | return err; |
| 513 | } |
| 514 | |
| 515 | const struct bpf_func_proto bpf_strtol_proto = { |
| 516 | .func = bpf_strtol, |
| 517 | .gpl_only = false, |
| 518 | .ret_type = RET_INTEGER, |
| 519 | .arg1_type = ARG_PTR_TO_MEM, |
| 520 | .arg2_type = ARG_CONST_SIZE, |
| 521 | .arg3_type = ARG_ANYTHING, |
| 522 | .arg4_type = ARG_PTR_TO_LONG, |
| 523 | }; |
| 524 | |
| 525 | BPF_CALL_4(bpf_strtoul, const char *, buf, size_t, buf_len, u64, flags, |
| 526 | unsigned long *, res) |
| 527 | { |
| 528 | unsigned long long _res; |
| 529 | bool is_negative; |
| 530 | int err; |
| 531 | |
| 532 | err = __bpf_strtoull(buf, buf_len, flags, &_res, &is_negative); |
| 533 | if (err < 0) |
| 534 | return err; |
| 535 | if (is_negative) |
| 536 | return -EINVAL; |
| 537 | if (_res != (unsigned long)_res) |
| 538 | return -ERANGE; |
| 539 | *res = _res; |
| 540 | return err; |
| 541 | } |
| 542 | |
| 543 | const struct bpf_func_proto bpf_strtoul_proto = { |
| 544 | .func = bpf_strtoul, |
| 545 | .gpl_only = false, |
| 546 | .ret_type = RET_INTEGER, |
| 547 | .arg1_type = ARG_PTR_TO_MEM, |
| 548 | .arg2_type = ARG_CONST_SIZE, |
| 549 | .arg3_type = ARG_ANYTHING, |
| 550 | .arg4_type = ARG_PTR_TO_LONG, |
| 551 | }; |
Roman Gushchin | 8bad74f | 2018-09-28 14:45:36 +0000 | [diff] [blame] | 552 | #endif |
Carlos Neira | b4490c5 | 2020-03-04 17:41:56 -0300 | [diff] [blame] | 553 | |
| 554 | BPF_CALL_4(bpf_get_ns_current_pid_tgid, u64, dev, u64, ino, |
| 555 | struct bpf_pidns_info *, nsdata, u32, size) |
| 556 | { |
| 557 | struct task_struct *task = current; |
| 558 | struct pid_namespace *pidns; |
| 559 | int err = -EINVAL; |
| 560 | |
| 561 | if (unlikely(size != sizeof(struct bpf_pidns_info))) |
| 562 | goto clear; |
| 563 | |
| 564 | if (unlikely((u64)(dev_t)dev != dev)) |
| 565 | goto clear; |
| 566 | |
| 567 | if (unlikely(!task)) |
| 568 | goto clear; |
| 569 | |
| 570 | pidns = task_active_pid_ns(task); |
| 571 | if (unlikely(!pidns)) { |
| 572 | err = -ENOENT; |
| 573 | goto clear; |
| 574 | } |
| 575 | |
| 576 | if (!ns_match(&pidns->ns, (dev_t)dev, ino)) |
| 577 | goto clear; |
| 578 | |
| 579 | nsdata->pid = task_pid_nr_ns(task, pidns); |
| 580 | nsdata->tgid = task_tgid_nr_ns(task, pidns); |
| 581 | return 0; |
| 582 | clear: |
| 583 | memset((void *)nsdata, 0, (size_t) size); |
| 584 | return err; |
| 585 | } |
| 586 | |
| 587 | const struct bpf_func_proto bpf_get_ns_current_pid_tgid_proto = { |
| 588 | .func = bpf_get_ns_current_pid_tgid, |
| 589 | .gpl_only = false, |
| 590 | .ret_type = RET_INTEGER, |
| 591 | .arg1_type = ARG_ANYTHING, |
| 592 | .arg2_type = ARG_ANYTHING, |
| 593 | .arg3_type = ARG_PTR_TO_UNINIT_MEM, |
| 594 | .arg4_type = ARG_CONST_SIZE, |
| 595 | }; |
Stanislav Fomichev | 6890896 | 2020-04-24 16:59:41 -0700 | [diff] [blame] | 596 | |
| 597 | static const struct bpf_func_proto bpf_get_raw_smp_processor_id_proto = { |
| 598 | .func = bpf_get_raw_cpu_id, |
| 599 | .gpl_only = false, |
| 600 | .ret_type = RET_INTEGER, |
| 601 | }; |
| 602 | |
| 603 | BPF_CALL_5(bpf_event_output_data, void *, ctx, struct bpf_map *, map, |
| 604 | u64, flags, void *, data, u64, size) |
| 605 | { |
| 606 | if (unlikely(flags & ~(BPF_F_INDEX_MASK))) |
| 607 | return -EINVAL; |
| 608 | |
| 609 | return bpf_event_output(map, flags, data, size, NULL, 0, NULL); |
| 610 | } |
| 611 | |
| 612 | const struct bpf_func_proto bpf_event_output_data_proto = { |
| 613 | .func = bpf_event_output_data, |
| 614 | .gpl_only = true, |
| 615 | .ret_type = RET_INTEGER, |
| 616 | .arg1_type = ARG_PTR_TO_CTX, |
| 617 | .arg2_type = ARG_CONST_MAP_PTR, |
| 618 | .arg3_type = ARG_ANYTHING, |
| 619 | .arg4_type = ARG_PTR_TO_MEM, |
| 620 | .arg5_type = ARG_CONST_SIZE_OR_ZERO, |
| 621 | }; |
| 622 | |
Alexei Starovoitov | 07be4c4 | 2020-08-27 15:01:12 -0700 | [diff] [blame] | 623 | BPF_CALL_3(bpf_copy_from_user, void *, dst, u32, size, |
| 624 | const void __user *, user_ptr) |
| 625 | { |
| 626 | int ret = copy_from_user(dst, user_ptr, size); |
| 627 | |
| 628 | if (unlikely(ret)) { |
| 629 | memset(dst, 0, size); |
| 630 | ret = -EFAULT; |
| 631 | } |
| 632 | |
| 633 | return ret; |
| 634 | } |
| 635 | |
| 636 | const struct bpf_func_proto bpf_copy_from_user_proto = { |
| 637 | .func = bpf_copy_from_user, |
| 638 | .gpl_only = false, |
| 639 | .ret_type = RET_INTEGER, |
| 640 | .arg1_type = ARG_PTR_TO_UNINIT_MEM, |
| 641 | .arg2_type = ARG_CONST_SIZE_OR_ZERO, |
| 642 | .arg3_type = ARG_ANYTHING, |
| 643 | }; |
| 644 | |
Hao Luo | eaa6bcb | 2020-09-29 16:50:47 -0700 | [diff] [blame] | 645 | BPF_CALL_2(bpf_per_cpu_ptr, const void *, ptr, u32, cpu) |
| 646 | { |
| 647 | if (cpu >= nr_cpu_ids) |
| 648 | return (unsigned long)NULL; |
| 649 | |
| 650 | return (unsigned long)per_cpu_ptr((const void __percpu *)ptr, cpu); |
| 651 | } |
| 652 | |
| 653 | const struct bpf_func_proto bpf_per_cpu_ptr_proto = { |
| 654 | .func = bpf_per_cpu_ptr, |
| 655 | .gpl_only = false, |
| 656 | .ret_type = RET_PTR_TO_MEM_OR_BTF_ID_OR_NULL, |
| 657 | .arg1_type = ARG_PTR_TO_PERCPU_BTF_ID, |
| 658 | .arg2_type = ARG_ANYTHING, |
| 659 | }; |
| 660 | |
Hao Luo | 63d9b80 | 2020-09-29 16:50:48 -0700 | [diff] [blame] | 661 | BPF_CALL_1(bpf_this_cpu_ptr, const void *, percpu_ptr) |
| 662 | { |
| 663 | return (unsigned long)this_cpu_ptr((const void __percpu *)percpu_ptr); |
| 664 | } |
| 665 | |
| 666 | const struct bpf_func_proto bpf_this_cpu_ptr_proto = { |
| 667 | .func = bpf_this_cpu_ptr, |
| 668 | .gpl_only = false, |
| 669 | .ret_type = RET_PTR_TO_MEM_OR_BTF_ID, |
| 670 | .arg1_type = ARG_PTR_TO_PERCPU_BTF_ID, |
| 671 | }; |
| 672 | |
Florent Revest | d9c9e4d | 2021-04-19 17:52:38 +0200 | [diff] [blame] | 673 | static int bpf_trace_copy_string(char *buf, void *unsafe_ptr, char fmt_ptype, |
| 674 | size_t bufsz) |
| 675 | { |
| 676 | void __user *user_ptr = (__force void __user *)unsafe_ptr; |
| 677 | |
| 678 | buf[0] = 0; |
| 679 | |
| 680 | switch (fmt_ptype) { |
| 681 | case 's': |
| 682 | #ifdef CONFIG_ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE |
| 683 | if ((unsigned long)unsafe_ptr < TASK_SIZE) |
| 684 | return strncpy_from_user_nofault(buf, user_ptr, bufsz); |
| 685 | fallthrough; |
| 686 | #endif |
| 687 | case 'k': |
| 688 | return strncpy_from_kernel_nofault(buf, unsafe_ptr, bufsz); |
| 689 | case 'u': |
| 690 | return strncpy_from_user_nofault(buf, user_ptr, bufsz); |
| 691 | } |
| 692 | |
| 693 | return -EINVAL; |
| 694 | } |
| 695 | |
Florent Revest | 8afcc19 | 2021-05-17 11:28:29 +0200 | [diff] [blame] | 696 | /* Per-cpu temp buffers used by printf-like helpers to store the bprintf binary |
| 697 | * arguments representation. |
Florent Revest | d9c9e4d | 2021-04-19 17:52:38 +0200 | [diff] [blame] | 698 | */ |
Florent Revest | 8afcc19 | 2021-05-17 11:28:29 +0200 | [diff] [blame] | 699 | #define MAX_BPRINTF_BUF_LEN 512 |
Florent Revest | d9c9e4d | 2021-04-19 17:52:38 +0200 | [diff] [blame] | 700 | |
Florent Revest | e2d5b2b | 2021-05-11 10:10:54 +0200 | [diff] [blame] | 701 | /* Support executing three nested bprintf helper calls on a given CPU */ |
Florent Revest | 0af02eb | 2021-05-17 11:28:30 +0200 | [diff] [blame] | 702 | #define MAX_BPRINTF_NEST_LEVEL 3 |
Florent Revest | e2d5b2b | 2021-05-11 10:10:54 +0200 | [diff] [blame] | 703 | struct bpf_bprintf_buffers { |
Florent Revest | 0af02eb | 2021-05-17 11:28:30 +0200 | [diff] [blame] | 704 | char tmp_bufs[MAX_BPRINTF_NEST_LEVEL][MAX_BPRINTF_BUF_LEN]; |
Florent Revest | d9c9e4d | 2021-04-19 17:52:38 +0200 | [diff] [blame] | 705 | }; |
Florent Revest | e2d5b2b | 2021-05-11 10:10:54 +0200 | [diff] [blame] | 706 | static DEFINE_PER_CPU(struct bpf_bprintf_buffers, bpf_bprintf_bufs); |
| 707 | static DEFINE_PER_CPU(int, bpf_bprintf_nest_level); |
Florent Revest | d9c9e4d | 2021-04-19 17:52:38 +0200 | [diff] [blame] | 708 | |
| 709 | static int try_get_fmt_tmp_buf(char **tmp_buf) |
| 710 | { |
Florent Revest | e2d5b2b | 2021-05-11 10:10:54 +0200 | [diff] [blame] | 711 | struct bpf_bprintf_buffers *bufs; |
| 712 | int nest_level; |
Florent Revest | d9c9e4d | 2021-04-19 17:52:38 +0200 | [diff] [blame] | 713 | |
Florent Revest | d9c9e4d | 2021-04-19 17:52:38 +0200 | [diff] [blame] | 714 | preempt_disable(); |
Florent Revest | e2d5b2b | 2021-05-11 10:10:54 +0200 | [diff] [blame] | 715 | nest_level = this_cpu_inc_return(bpf_bprintf_nest_level); |
Florent Revest | 0af02eb | 2021-05-17 11:28:30 +0200 | [diff] [blame] | 716 | if (WARN_ON_ONCE(nest_level > MAX_BPRINTF_NEST_LEVEL)) { |
Florent Revest | e2d5b2b | 2021-05-11 10:10:54 +0200 | [diff] [blame] | 717 | this_cpu_dec(bpf_bprintf_nest_level); |
Florent Revest | d9c9e4d | 2021-04-19 17:52:38 +0200 | [diff] [blame] | 718 | preempt_enable(); |
| 719 | return -EBUSY; |
| 720 | } |
Florent Revest | e2d5b2b | 2021-05-11 10:10:54 +0200 | [diff] [blame] | 721 | bufs = this_cpu_ptr(&bpf_bprintf_bufs); |
| 722 | *tmp_buf = bufs->tmp_bufs[nest_level - 1]; |
Florent Revest | d9c9e4d | 2021-04-19 17:52:38 +0200 | [diff] [blame] | 723 | |
| 724 | return 0; |
| 725 | } |
| 726 | |
Florent Revest | 48cac3f | 2021-04-27 19:43:13 +0200 | [diff] [blame] | 727 | void bpf_bprintf_cleanup(void) |
Florent Revest | d9c9e4d | 2021-04-19 17:52:38 +0200 | [diff] [blame] | 728 | { |
Florent Revest | e2d5b2b | 2021-05-11 10:10:54 +0200 | [diff] [blame] | 729 | if (this_cpu_read(bpf_bprintf_nest_level)) { |
| 730 | this_cpu_dec(bpf_bprintf_nest_level); |
Florent Revest | d9c9e4d | 2021-04-19 17:52:38 +0200 | [diff] [blame] | 731 | preempt_enable(); |
| 732 | } |
| 733 | } |
| 734 | |
| 735 | /* |
Florent Revest | 48cac3f | 2021-04-27 19:43:13 +0200 | [diff] [blame] | 736 | * bpf_bprintf_prepare - Generic pass on format strings for bprintf-like helpers |
Florent Revest | d9c9e4d | 2021-04-19 17:52:38 +0200 | [diff] [blame] | 737 | * |
| 738 | * Returns a negative value if fmt is an invalid format string or 0 otherwise. |
| 739 | * |
| 740 | * This can be used in two ways: |
Florent Revest | 48cac3f | 2021-04-27 19:43:13 +0200 | [diff] [blame] | 741 | * - Format string verification only: when bin_args is NULL |
Florent Revest | d9c9e4d | 2021-04-19 17:52:38 +0200 | [diff] [blame] | 742 | * - Arguments preparation: in addition to the above verification, it writes in |
Florent Revest | 48cac3f | 2021-04-27 19:43:13 +0200 | [diff] [blame] | 743 | * bin_args a binary representation of arguments usable by bstr_printf where |
| 744 | * pointers from BPF have been sanitized. |
Florent Revest | d9c9e4d | 2021-04-19 17:52:38 +0200 | [diff] [blame] | 745 | * |
| 746 | * In argument preparation mode, if 0 is returned, safe temporary buffers are |
Florent Revest | 48cac3f | 2021-04-27 19:43:13 +0200 | [diff] [blame] | 747 | * allocated and bpf_bprintf_cleanup should be called to free them after use. |
Florent Revest | d9c9e4d | 2021-04-19 17:52:38 +0200 | [diff] [blame] | 748 | */ |
Florent Revest | 48cac3f | 2021-04-27 19:43:13 +0200 | [diff] [blame] | 749 | int bpf_bprintf_prepare(char *fmt, u32 fmt_size, const u64 *raw_args, |
| 750 | u32 **bin_args, u32 num_args) |
Florent Revest | d9c9e4d | 2021-04-19 17:52:38 +0200 | [diff] [blame] | 751 | { |
Florent Revest | 48cac3f | 2021-04-27 19:43:13 +0200 | [diff] [blame] | 752 | char *unsafe_ptr = NULL, *tmp_buf = NULL, *tmp_buf_end, *fmt_end; |
| 753 | size_t sizeof_cur_arg, sizeof_cur_ip; |
| 754 | int err, i, num_spec = 0; |
Florent Revest | d9c9e4d | 2021-04-19 17:52:38 +0200 | [diff] [blame] | 755 | u64 cur_arg; |
Florent Revest | 48cac3f | 2021-04-27 19:43:13 +0200 | [diff] [blame] | 756 | char fmt_ptype, cur_ip[16], ip_spec[] = "%pXX"; |
Florent Revest | d9c9e4d | 2021-04-19 17:52:38 +0200 | [diff] [blame] | 757 | |
| 758 | fmt_end = strnchr(fmt, fmt_size, 0); |
| 759 | if (!fmt_end) |
| 760 | return -EINVAL; |
| 761 | fmt_size = fmt_end - fmt; |
| 762 | |
Florent Revest | 48cac3f | 2021-04-27 19:43:13 +0200 | [diff] [blame] | 763 | if (bin_args) { |
| 764 | if (num_args && try_get_fmt_tmp_buf(&tmp_buf)) |
| 765 | return -EBUSY; |
| 766 | |
Florent Revest | 8afcc19 | 2021-05-17 11:28:29 +0200 | [diff] [blame] | 767 | tmp_buf_end = tmp_buf + MAX_BPRINTF_BUF_LEN; |
Florent Revest | 48cac3f | 2021-04-27 19:43:13 +0200 | [diff] [blame] | 768 | *bin_args = (u32 *)tmp_buf; |
| 769 | } |
| 770 | |
Florent Revest | d9c9e4d | 2021-04-19 17:52:38 +0200 | [diff] [blame] | 771 | for (i = 0; i < fmt_size; i++) { |
| 772 | if ((!isprint(fmt[i]) && !isspace(fmt[i])) || !isascii(fmt[i])) { |
| 773 | err = -EINVAL; |
Florent Revest | 48cac3f | 2021-04-27 19:43:13 +0200 | [diff] [blame] | 774 | goto out; |
Florent Revest | d9c9e4d | 2021-04-19 17:52:38 +0200 | [diff] [blame] | 775 | } |
| 776 | |
| 777 | if (fmt[i] != '%') |
| 778 | continue; |
| 779 | |
| 780 | if (fmt[i + 1] == '%') { |
| 781 | i++; |
| 782 | continue; |
| 783 | } |
| 784 | |
| 785 | if (num_spec >= num_args) { |
| 786 | err = -EINVAL; |
Florent Revest | 48cac3f | 2021-04-27 19:43:13 +0200 | [diff] [blame] | 787 | goto out; |
Florent Revest | d9c9e4d | 2021-04-19 17:52:38 +0200 | [diff] [blame] | 788 | } |
| 789 | |
| 790 | /* The string is zero-terminated so if fmt[i] != 0, we can |
| 791 | * always access fmt[i + 1], in the worst case it will be a 0 |
| 792 | */ |
| 793 | i++; |
| 794 | |
| 795 | /* skip optional "[0 +-][num]" width formatting field */ |
| 796 | while (fmt[i] == '0' || fmt[i] == '+' || fmt[i] == '-' || |
| 797 | fmt[i] == ' ') |
| 798 | i++; |
| 799 | if (fmt[i] >= '1' && fmt[i] <= '9') { |
| 800 | i++; |
| 801 | while (fmt[i] >= '0' && fmt[i] <= '9') |
| 802 | i++; |
| 803 | } |
| 804 | |
| 805 | if (fmt[i] == 'p') { |
Florent Revest | 48cac3f | 2021-04-27 19:43:13 +0200 | [diff] [blame] | 806 | sizeof_cur_arg = sizeof(long); |
Florent Revest | d9c9e4d | 2021-04-19 17:52:38 +0200 | [diff] [blame] | 807 | |
| 808 | if ((fmt[i + 1] == 'k' || fmt[i + 1] == 'u') && |
| 809 | fmt[i + 2] == 's') { |
| 810 | fmt_ptype = fmt[i + 1]; |
| 811 | i += 2; |
| 812 | goto fmt_str; |
| 813 | } |
| 814 | |
| 815 | if (fmt[i + 1] == 0 || isspace(fmt[i + 1]) || |
| 816 | ispunct(fmt[i + 1]) || fmt[i + 1] == 'K' || |
Florent Revest | 48cac3f | 2021-04-27 19:43:13 +0200 | [diff] [blame] | 817 | fmt[i + 1] == 'x' || fmt[i + 1] == 's' || |
| 818 | fmt[i + 1] == 'S') { |
Florent Revest | d9c9e4d | 2021-04-19 17:52:38 +0200 | [diff] [blame] | 819 | /* just kernel pointers */ |
Florent Revest | 48cac3f | 2021-04-27 19:43:13 +0200 | [diff] [blame] | 820 | if (tmp_buf) |
Florent Revest | d9c9e4d | 2021-04-19 17:52:38 +0200 | [diff] [blame] | 821 | cur_arg = raw_args[num_spec]; |
Florent Revest | 48cac3f | 2021-04-27 19:43:13 +0200 | [diff] [blame] | 822 | i++; |
| 823 | goto nocopy_fmt; |
| 824 | } |
| 825 | |
| 826 | if (fmt[i + 1] == 'B') { |
| 827 | if (tmp_buf) { |
| 828 | err = snprintf(tmp_buf, |
| 829 | (tmp_buf_end - tmp_buf), |
| 830 | "%pB", |
| 831 | (void *)(long)raw_args[num_spec]); |
| 832 | tmp_buf += (err + 1); |
| 833 | } |
| 834 | |
| 835 | i++; |
| 836 | num_spec++; |
| 837 | continue; |
Florent Revest | d9c9e4d | 2021-04-19 17:52:38 +0200 | [diff] [blame] | 838 | } |
| 839 | |
| 840 | /* only support "%pI4", "%pi4", "%pI6" and "%pi6". */ |
| 841 | if ((fmt[i + 1] != 'i' && fmt[i + 1] != 'I') || |
| 842 | (fmt[i + 2] != '4' && fmt[i + 2] != '6')) { |
| 843 | err = -EINVAL; |
Florent Revest | d9c9e4d | 2021-04-19 17:52:38 +0200 | [diff] [blame] | 844 | goto out; |
| 845 | } |
| 846 | |
Florent Revest | 48cac3f | 2021-04-27 19:43:13 +0200 | [diff] [blame] | 847 | i += 2; |
| 848 | if (!tmp_buf) |
| 849 | goto nocopy_fmt; |
| 850 | |
| 851 | sizeof_cur_ip = (fmt[i] == '4') ? 4 : 16; |
| 852 | if (tmp_buf_end - tmp_buf < sizeof_cur_ip) { |
Florent Revest | d9c9e4d | 2021-04-19 17:52:38 +0200 | [diff] [blame] | 853 | err = -ENOSPC; |
Florent Revest | 48cac3f | 2021-04-27 19:43:13 +0200 | [diff] [blame] | 854 | goto out; |
Florent Revest | d9c9e4d | 2021-04-19 17:52:38 +0200 | [diff] [blame] | 855 | } |
| 856 | |
| 857 | unsafe_ptr = (char *)(long)raw_args[num_spec]; |
Florent Revest | 48cac3f | 2021-04-27 19:43:13 +0200 | [diff] [blame] | 858 | err = copy_from_kernel_nofault(cur_ip, unsafe_ptr, |
| 859 | sizeof_cur_ip); |
Florent Revest | d9c9e4d | 2021-04-19 17:52:38 +0200 | [diff] [blame] | 860 | if (err < 0) |
Florent Revest | 48cac3f | 2021-04-27 19:43:13 +0200 | [diff] [blame] | 861 | memset(cur_ip, 0, sizeof_cur_ip); |
Florent Revest | d9c9e4d | 2021-04-19 17:52:38 +0200 | [diff] [blame] | 862 | |
Florent Revest | 48cac3f | 2021-04-27 19:43:13 +0200 | [diff] [blame] | 863 | /* hack: bstr_printf expects IP addresses to be |
| 864 | * pre-formatted as strings, ironically, the easiest way |
| 865 | * to do that is to call snprintf. |
| 866 | */ |
| 867 | ip_spec[2] = fmt[i - 1]; |
| 868 | ip_spec[3] = fmt[i]; |
| 869 | err = snprintf(tmp_buf, tmp_buf_end - tmp_buf, |
| 870 | ip_spec, &cur_ip); |
| 871 | |
| 872 | tmp_buf += err + 1; |
| 873 | num_spec++; |
| 874 | |
| 875 | continue; |
Florent Revest | d9c9e4d | 2021-04-19 17:52:38 +0200 | [diff] [blame] | 876 | } else if (fmt[i] == 's') { |
Florent Revest | d9c9e4d | 2021-04-19 17:52:38 +0200 | [diff] [blame] | 877 | fmt_ptype = fmt[i]; |
| 878 | fmt_str: |
| 879 | if (fmt[i + 1] != 0 && |
| 880 | !isspace(fmt[i + 1]) && |
| 881 | !ispunct(fmt[i + 1])) { |
| 882 | err = -EINVAL; |
Florent Revest | d9c9e4d | 2021-04-19 17:52:38 +0200 | [diff] [blame] | 883 | goto out; |
| 884 | } |
| 885 | |
Florent Revest | 48cac3f | 2021-04-27 19:43:13 +0200 | [diff] [blame] | 886 | if (!tmp_buf) |
| 887 | goto nocopy_fmt; |
| 888 | |
| 889 | if (tmp_buf_end == tmp_buf) { |
Florent Revest | d9c9e4d | 2021-04-19 17:52:38 +0200 | [diff] [blame] | 890 | err = -ENOSPC; |
Florent Revest | 48cac3f | 2021-04-27 19:43:13 +0200 | [diff] [blame] | 891 | goto out; |
Florent Revest | d9c9e4d | 2021-04-19 17:52:38 +0200 | [diff] [blame] | 892 | } |
| 893 | |
| 894 | unsafe_ptr = (char *)(long)raw_args[num_spec]; |
| 895 | err = bpf_trace_copy_string(tmp_buf, unsafe_ptr, |
Florent Revest | 48cac3f | 2021-04-27 19:43:13 +0200 | [diff] [blame] | 896 | fmt_ptype, |
| 897 | tmp_buf_end - tmp_buf); |
Florent Revest | d9c9e4d | 2021-04-19 17:52:38 +0200 | [diff] [blame] | 898 | if (err < 0) { |
| 899 | tmp_buf[0] = '\0'; |
| 900 | err = 1; |
| 901 | } |
| 902 | |
Florent Revest | d9c9e4d | 2021-04-19 17:52:38 +0200 | [diff] [blame] | 903 | tmp_buf += err; |
Florent Revest | 48cac3f | 2021-04-27 19:43:13 +0200 | [diff] [blame] | 904 | num_spec++; |
Florent Revest | d9c9e4d | 2021-04-19 17:52:38 +0200 | [diff] [blame] | 905 | |
Florent Revest | 48cac3f | 2021-04-27 19:43:13 +0200 | [diff] [blame] | 906 | continue; |
Florent Revest | d9c9e4d | 2021-04-19 17:52:38 +0200 | [diff] [blame] | 907 | } |
| 908 | |
Florent Revest | 48cac3f | 2021-04-27 19:43:13 +0200 | [diff] [blame] | 909 | sizeof_cur_arg = sizeof(int); |
Florent Revest | d9c9e4d | 2021-04-19 17:52:38 +0200 | [diff] [blame] | 910 | |
| 911 | if (fmt[i] == 'l') { |
Florent Revest | 48cac3f | 2021-04-27 19:43:13 +0200 | [diff] [blame] | 912 | sizeof_cur_arg = sizeof(long); |
Florent Revest | d9c9e4d | 2021-04-19 17:52:38 +0200 | [diff] [blame] | 913 | i++; |
| 914 | } |
| 915 | if (fmt[i] == 'l') { |
Florent Revest | 48cac3f | 2021-04-27 19:43:13 +0200 | [diff] [blame] | 916 | sizeof_cur_arg = sizeof(long long); |
Florent Revest | d9c9e4d | 2021-04-19 17:52:38 +0200 | [diff] [blame] | 917 | i++; |
| 918 | } |
| 919 | |
| 920 | if (fmt[i] != 'i' && fmt[i] != 'd' && fmt[i] != 'u' && |
| 921 | fmt[i] != 'x' && fmt[i] != 'X') { |
| 922 | err = -EINVAL; |
Florent Revest | 48cac3f | 2021-04-27 19:43:13 +0200 | [diff] [blame] | 923 | goto out; |
Florent Revest | d9c9e4d | 2021-04-19 17:52:38 +0200 | [diff] [blame] | 924 | } |
| 925 | |
Florent Revest | 48cac3f | 2021-04-27 19:43:13 +0200 | [diff] [blame] | 926 | if (tmp_buf) |
Florent Revest | d9c9e4d | 2021-04-19 17:52:38 +0200 | [diff] [blame] | 927 | cur_arg = raw_args[num_spec]; |
Florent Revest | 48cac3f | 2021-04-27 19:43:13 +0200 | [diff] [blame] | 928 | nocopy_fmt: |
| 929 | if (tmp_buf) { |
| 930 | tmp_buf = PTR_ALIGN(tmp_buf, sizeof(u32)); |
| 931 | if (tmp_buf_end - tmp_buf < sizeof_cur_arg) { |
| 932 | err = -ENOSPC; |
| 933 | goto out; |
| 934 | } |
| 935 | |
| 936 | if (sizeof_cur_arg == 8) { |
| 937 | *(u32 *)tmp_buf = *(u32 *)&cur_arg; |
| 938 | *(u32 *)(tmp_buf + 4) = *((u32 *)&cur_arg + 1); |
| 939 | } else { |
| 940 | *(u32 *)tmp_buf = (u32)(long)cur_arg; |
| 941 | } |
| 942 | tmp_buf += sizeof_cur_arg; |
Florent Revest | d9c9e4d | 2021-04-19 17:52:38 +0200 | [diff] [blame] | 943 | } |
| 944 | num_spec++; |
| 945 | } |
| 946 | |
| 947 | err = 0; |
Florent Revest | d9c9e4d | 2021-04-19 17:52:38 +0200 | [diff] [blame] | 948 | out: |
Florent Revest | 48cac3f | 2021-04-27 19:43:13 +0200 | [diff] [blame] | 949 | if (err) |
| 950 | bpf_bprintf_cleanup(); |
Florent Revest | d9c9e4d | 2021-04-19 17:52:38 +0200 | [diff] [blame] | 951 | return err; |
| 952 | } |
| 953 | |
Florent Revest | 7b15523 | 2021-04-19 17:52:40 +0200 | [diff] [blame] | 954 | #define MAX_SNPRINTF_VARARGS 12 |
| 955 | |
| 956 | BPF_CALL_5(bpf_snprintf, char *, str, u32, str_size, char *, fmt, |
| 957 | const void *, data, u32, data_len) |
| 958 | { |
Florent Revest | 7b15523 | 2021-04-19 17:52:40 +0200 | [diff] [blame] | 959 | int err, num_args; |
Florent Revest | 48cac3f | 2021-04-27 19:43:13 +0200 | [diff] [blame] | 960 | u32 *bin_args; |
Florent Revest | 7b15523 | 2021-04-19 17:52:40 +0200 | [diff] [blame] | 961 | |
| 962 | if (data_len % 8 || data_len > MAX_SNPRINTF_VARARGS * 8 || |
| 963 | (data_len && !data)) |
| 964 | return -EINVAL; |
| 965 | num_args = data_len / 8; |
| 966 | |
| 967 | /* ARG_PTR_TO_CONST_STR guarantees that fmt is zero-terminated so we |
| 968 | * can safely give an unbounded size. |
| 969 | */ |
Florent Revest | 48cac3f | 2021-04-27 19:43:13 +0200 | [diff] [blame] | 970 | err = bpf_bprintf_prepare(fmt, UINT_MAX, data, &bin_args, num_args); |
Florent Revest | 7b15523 | 2021-04-19 17:52:40 +0200 | [diff] [blame] | 971 | if (err < 0) |
| 972 | return err; |
| 973 | |
Florent Revest | 48cac3f | 2021-04-27 19:43:13 +0200 | [diff] [blame] | 974 | err = bstr_printf(str, str_size, fmt, bin_args); |
Florent Revest | 7b15523 | 2021-04-19 17:52:40 +0200 | [diff] [blame] | 975 | |
Florent Revest | 48cac3f | 2021-04-27 19:43:13 +0200 | [diff] [blame] | 976 | bpf_bprintf_cleanup(); |
Florent Revest | 7b15523 | 2021-04-19 17:52:40 +0200 | [diff] [blame] | 977 | |
| 978 | return err + 1; |
| 979 | } |
| 980 | |
| 981 | const struct bpf_func_proto bpf_snprintf_proto = { |
| 982 | .func = bpf_snprintf, |
| 983 | .gpl_only = true, |
| 984 | .ret_type = RET_INTEGER, |
| 985 | .arg1_type = ARG_PTR_TO_MEM_OR_NULL, |
| 986 | .arg2_type = ARG_CONST_SIZE_OR_ZERO, |
| 987 | .arg3_type = ARG_PTR_TO_CONST_STR, |
| 988 | .arg4_type = ARG_PTR_TO_MEM_OR_NULL, |
| 989 | .arg5_type = ARG_CONST_SIZE_OR_ZERO, |
| 990 | }; |
| 991 | |
John Fastabend | f470378 | 2020-05-24 09:50:55 -0700 | [diff] [blame] | 992 | const struct bpf_func_proto bpf_get_current_task_proto __weak; |
| 993 | const struct bpf_func_proto bpf_probe_read_user_proto __weak; |
| 994 | const struct bpf_func_proto bpf_probe_read_user_str_proto __weak; |
| 995 | const struct bpf_func_proto bpf_probe_read_kernel_proto __weak; |
| 996 | const struct bpf_func_proto bpf_probe_read_kernel_str_proto __weak; |
| 997 | |
Stanislav Fomichev | 6890896 | 2020-04-24 16:59:41 -0700 | [diff] [blame] | 998 | const struct bpf_func_proto * |
| 999 | bpf_base_func_proto(enum bpf_func_id func_id) |
| 1000 | { |
| 1001 | switch (func_id) { |
| 1002 | case BPF_FUNC_map_lookup_elem: |
| 1003 | return &bpf_map_lookup_elem_proto; |
| 1004 | case BPF_FUNC_map_update_elem: |
| 1005 | return &bpf_map_update_elem_proto; |
| 1006 | case BPF_FUNC_map_delete_elem: |
| 1007 | return &bpf_map_delete_elem_proto; |
| 1008 | case BPF_FUNC_map_push_elem: |
| 1009 | return &bpf_map_push_elem_proto; |
| 1010 | case BPF_FUNC_map_pop_elem: |
| 1011 | return &bpf_map_pop_elem_proto; |
| 1012 | case BPF_FUNC_map_peek_elem: |
| 1013 | return &bpf_map_peek_elem_proto; |
| 1014 | case BPF_FUNC_get_prandom_u32: |
| 1015 | return &bpf_get_prandom_u32_proto; |
| 1016 | case BPF_FUNC_get_smp_processor_id: |
| 1017 | return &bpf_get_raw_smp_processor_id_proto; |
| 1018 | case BPF_FUNC_get_numa_node_id: |
| 1019 | return &bpf_get_numa_node_id_proto; |
| 1020 | case BPF_FUNC_tail_call: |
| 1021 | return &bpf_tail_call_proto; |
| 1022 | case BPF_FUNC_ktime_get_ns: |
| 1023 | return &bpf_ktime_get_ns_proto; |
Maciej Żenczykowski | 71d1921 | 2020-04-26 09:15:25 -0700 | [diff] [blame] | 1024 | case BPF_FUNC_ktime_get_boot_ns: |
| 1025 | return &bpf_ktime_get_boot_ns_proto; |
Dmitrii Banshchikov | d055126 | 2020-11-17 18:45:49 +0000 | [diff] [blame] | 1026 | case BPF_FUNC_ktime_get_coarse_ns: |
| 1027 | return &bpf_ktime_get_coarse_ns_proto; |
Andrii Nakryiko | 457f4436 | 2020-05-29 00:54:20 -0700 | [diff] [blame] | 1028 | case BPF_FUNC_ringbuf_output: |
| 1029 | return &bpf_ringbuf_output_proto; |
| 1030 | case BPF_FUNC_ringbuf_reserve: |
| 1031 | return &bpf_ringbuf_reserve_proto; |
| 1032 | case BPF_FUNC_ringbuf_submit: |
| 1033 | return &bpf_ringbuf_submit_proto; |
| 1034 | case BPF_FUNC_ringbuf_discard: |
| 1035 | return &bpf_ringbuf_discard_proto; |
| 1036 | case BPF_FUNC_ringbuf_query: |
| 1037 | return &bpf_ringbuf_query_proto; |
Yonghong Song | 69c087b | 2021-02-26 12:49:25 -0800 | [diff] [blame] | 1038 | case BPF_FUNC_for_each_map_elem: |
| 1039 | return &bpf_for_each_map_elem_proto; |
Stanislav Fomichev | 6890896 | 2020-04-24 16:59:41 -0700 | [diff] [blame] | 1040 | default: |
| 1041 | break; |
| 1042 | } |
| 1043 | |
Alexei Starovoitov | 2c78ee8 | 2020-05-13 16:03:54 -0700 | [diff] [blame] | 1044 | if (!bpf_capable()) |
Stanislav Fomichev | 6890896 | 2020-04-24 16:59:41 -0700 | [diff] [blame] | 1045 | return NULL; |
| 1046 | |
| 1047 | switch (func_id) { |
| 1048 | case BPF_FUNC_spin_lock: |
| 1049 | return &bpf_spin_lock_proto; |
| 1050 | case BPF_FUNC_spin_unlock: |
| 1051 | return &bpf_spin_unlock_proto; |
Stanislav Fomichev | 6890896 | 2020-04-24 16:59:41 -0700 | [diff] [blame] | 1052 | case BPF_FUNC_jiffies64: |
| 1053 | return &bpf_jiffies64_proto; |
Andrii Nakryiko | b7906b7 | 2020-12-11 22:36:25 +0100 | [diff] [blame] | 1054 | case BPF_FUNC_per_cpu_ptr: |
Hao Luo | eaa6bcb | 2020-09-29 16:50:47 -0700 | [diff] [blame] | 1055 | return &bpf_per_cpu_ptr_proto; |
Andrii Nakryiko | b7906b7 | 2020-12-11 22:36:25 +0100 | [diff] [blame] | 1056 | case BPF_FUNC_this_cpu_ptr: |
Hao Luo | 63d9b80 | 2020-09-29 16:50:48 -0700 | [diff] [blame] | 1057 | return &bpf_this_cpu_ptr_proto; |
Stanislav Fomichev | 6890896 | 2020-04-24 16:59:41 -0700 | [diff] [blame] | 1058 | default: |
John Fastabend | f470378 | 2020-05-24 09:50:55 -0700 | [diff] [blame] | 1059 | break; |
| 1060 | } |
| 1061 | |
| 1062 | if (!perfmon_capable()) |
| 1063 | return NULL; |
| 1064 | |
| 1065 | switch (func_id) { |
Tobias Klauser | 61ca36c8 | 2021-01-27 18:46:15 +0100 | [diff] [blame] | 1066 | case BPF_FUNC_trace_printk: |
| 1067 | return bpf_get_trace_printk_proto(); |
John Fastabend | f470378 | 2020-05-24 09:50:55 -0700 | [diff] [blame] | 1068 | case BPF_FUNC_get_current_task: |
| 1069 | return &bpf_get_current_task_proto; |
| 1070 | case BPF_FUNC_probe_read_user: |
| 1071 | return &bpf_probe_read_user_proto; |
| 1072 | case BPF_FUNC_probe_read_kernel: |
Daniel Borkmann | ff40e51 | 2021-05-28 09:16:31 +0000 | [diff] [blame] | 1073 | return security_locked_down(LOCKDOWN_BPF_READ) < 0 ? |
| 1074 | NULL : &bpf_probe_read_kernel_proto; |
John Fastabend | f470378 | 2020-05-24 09:50:55 -0700 | [diff] [blame] | 1075 | case BPF_FUNC_probe_read_user_str: |
| 1076 | return &bpf_probe_read_user_str_proto; |
| 1077 | case BPF_FUNC_probe_read_kernel_str: |
Daniel Borkmann | ff40e51 | 2021-05-28 09:16:31 +0000 | [diff] [blame] | 1078 | return security_locked_down(LOCKDOWN_BPF_READ) < 0 ? |
| 1079 | NULL : &bpf_probe_read_kernel_str_proto; |
Tobias Klauser | 61ca36c8 | 2021-01-27 18:46:15 +0100 | [diff] [blame] | 1080 | case BPF_FUNC_snprintf_btf: |
| 1081 | return &bpf_snprintf_btf_proto; |
Florent Revest | 7b15523 | 2021-04-19 17:52:40 +0200 | [diff] [blame] | 1082 | case BPF_FUNC_snprintf: |
| 1083 | return &bpf_snprintf_proto; |
John Fastabend | f470378 | 2020-05-24 09:50:55 -0700 | [diff] [blame] | 1084 | default: |
Stanislav Fomichev | 6890896 | 2020-04-24 16:59:41 -0700 | [diff] [blame] | 1085 | return NULL; |
| 1086 | } |
| 1087 | } |