diff options
Diffstat (limited to 'kernel/bpf')
| -rw-r--r-- | kernel/bpf/verifier.c | 22 |
1 files changed, 21 insertions, 1 deletions
diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c index c1c9e441f0f5..48c2705db22c 100644 --- a/kernel/bpf/verifier.c +++ b/kernel/bpf/verifier.c @@ -2511,6 +2511,20 @@ process_bpf_exit: return 0; } +static int check_map_prog_compatibility(struct bpf_map *map, + struct bpf_prog *prog) + +{ + if (prog->type == BPF_PROG_TYPE_PERF_EVENT && + (map->map_type == BPF_MAP_TYPE_HASH || + map->map_type == BPF_MAP_TYPE_PERCPU_HASH) && + (map->map_flags & BPF_F_NO_PREALLOC)) { + verbose("perf_event programs can only use preallocated hash map\n"); + return -EINVAL; + } + return 0; +} + /* look for pseudo eBPF instructions that access map FDs and * replace them with actual map pointers */ @@ -2518,7 +2532,7 @@ static int replace_map_fd_with_map_ptr(struct verifier_env *env) { struct bpf_insn *insn = env->prog->insnsi; int insn_cnt = env->prog->len; - int i, j; + int i, j, err; for (i = 0; i < insn_cnt; i++, insn++) { if (BPF_CLASS(insn->code) == BPF_LDX && @@ -2562,6 +2576,12 @@ static int replace_map_fd_with_map_ptr(struct verifier_env *env) return PTR_ERR(map); } + err = check_map_prog_compatibility(map, env->prog); + if (err) { + fdput(f); + return err; + } + /* store map pointer inside BPF_LD_IMM64 instruction */ insn[0].imm = (u32) (unsigned long) map; insn[1].imm = ((u64) (unsigned long) map) >> 32; |