Messages in this thread Patch in this message | | | From | Benjamin Tissoires <> | Date | Sat, 20 Apr 2024 11:09:07 +0200 | Subject | [PATCH bpf-next v2 07/16] bpf: verifier: bail out if the argument is not a map |
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When a kfunc is declared with a KF_ARG_PTR_TO_MAP, we should have reg->map_ptr set to a non NULL value, otherwise, that means that the underlying type is not a map.
Signed-off-by: Benjamin Tissoires <bentiss@kernel.org>
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new in v2 --- kernel/bpf/verifier.c | 5 +++++ 1 file changed, 5 insertions(+)
diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c index deaf2e1ab690..b95fd63864f1 100644 --- a/kernel/bpf/verifier.c +++ b/kernel/bpf/verifier.c @@ -11720,6 +11720,11 @@ static int check_kfunc_args(struct bpf_verifier_env *env, struct bpf_kfunc_call_ case KF_ARG_PTR_TO_NULL: continue; case KF_ARG_PTR_TO_MAP: + if (!reg->map_ptr) { + verbose(env, "pointer in R%d isn't map pointer\n", regno); + return -EINVAL; + } + fallthrough; case KF_ARG_PTR_TO_ALLOC_BTF_ID: case KF_ARG_PTR_TO_BTF_ID: if (!is_kfunc_trusted_args(meta) && !is_kfunc_rcu(meta)) -- 2.44.0
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