diff options
Diffstat (limited to 'kernel/bpf/syscall.c')
| -rw-r--r-- | kernel/bpf/syscall.c | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/kernel/bpf/syscall.c b/kernel/bpf/syscall.c index bac3becf9f90..17f4254495f2 100644 --- a/kernel/bpf/syscall.c +++ b/kernel/bpf/syscall.c @@ -23,6 +23,7 @@ #include <linux/timekeeping.h> #include <linux/ctype.h> #include <linux/nospec.h> +#include <linux/audit.h> #include <uapi/linux/btf.h> #define IS_FD_ARRAY(map) ((map)->map_type == BPF_MAP_TYPE_PROG_ARRAY || \ @@ -1318,6 +1319,34 @@ static void free_used_maps(struct bpf_prog_aux *aux) kfree(aux->used_maps); } +enum bpf_event { + BPF_EVENT_LOAD, + BPF_EVENT_UNLOAD, +}; + +static const char * const bpf_event_audit_str[] = { + [BPF_EVENT_LOAD] = "LOAD", + [BPF_EVENT_UNLOAD] = "UNLOAD", +}; + +static void bpf_audit_prog(const struct bpf_prog *prog, enum bpf_event event) +{ + bool has_task_context = event == BPF_EVENT_LOAD; + struct audit_buffer *ab; + + if (audit_enabled == AUDIT_OFF) + return; + ab = audit_log_start(audit_context(), GFP_ATOMIC, AUDIT_BPF); + if (unlikely(!ab)) + return; + if (has_task_context) + audit_log_task(ab); + audit_log_format(ab, "%sprog-id=%u event=%s", + has_task_context ? " " : "", + prog->aux->id, bpf_event_audit_str[event]); + audit_log_end(ab); +} + int __bpf_prog_charge(struct user_struct *user, u32 pages) { unsigned long memlock_limit = rlimit(RLIMIT_MEMLOCK) >> PAGE_SHIFT; @@ -1434,6 +1463,7 @@ static void __bpf_prog_put(struct bpf_prog *prog, bool do_idr_lock) { if (atomic64_dec_and_test(&prog->aux->refcnt)) { perf_event_bpf_event(prog, PERF_BPF_EVENT_PROG_UNLOAD, 0); + bpf_audit_prog(prog, BPF_EVENT_UNLOAD); /* bpf_prog_free_id() must be called first */ bpf_prog_free_id(prog, do_idr_lock); __bpf_prog_put_noref(prog, true); @@ -1843,6 +1873,7 @@ static int bpf_prog_load(union bpf_attr *attr, union bpf_attr __user *uattr) */ bpf_prog_kallsyms_add(prog); perf_event_bpf_event(prog, PERF_BPF_EVENT_PROG_LOAD, 0); + bpf_audit_prog(prog, BPF_EVENT_LOAD); err = bpf_prog_new_fd(prog); if (err < 0) |