diff options
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/bpf/verifier.c | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c index f11dc5366e5b..bca0ca82d164 100644 --- a/kernel/bpf/verifier.c +++ b/kernel/bpf/verifier.c @@ -10441,10 +10441,27 @@ static bool check_btf_id_ok(const struct bpf_func_proto *fn) return true; } +static bool check_mem_arg_rw_flag_ok(const struct bpf_func_proto *fn) +{ + int i; + + for (i = 0; i < ARRAY_SIZE(fn->arg_type); i++) { + enum bpf_arg_type arg_type = fn->arg_type[i]; + + if (base_type(arg_type) != ARG_PTR_TO_MEM) + continue; + if (!(arg_type & (MEM_WRITE | MEM_RDONLY))) + return false; + } + + return true; +} + static int check_func_proto(const struct bpf_func_proto *fn) { return check_raw_mode_ok(fn) && check_arg_pair_ok(fn) && + check_mem_arg_rw_flag_ok(fn) && check_btf_id_ok(fn) ? 0 : -EINVAL; } |