diff options
| author |   Jakub Kicinski <kuba@kernel.org> | 2022-06-23 12:33:24 -0700 |
|---|---|---|
| committer | Jakub Kicinski <kuba@kernel.org> | 2022-06-23 12:33:24 -0700 |
| commit | 93817be8b62c7fa1f1bdc3e8c037a73a60026be9 (patch) | |
| tree | 873c207abc783edb4ead73b2b3a8a9b105f94420 /kernel/bpf/btf.c | |
| parent | nfp: add 'ethtool --identify' support (diff) | |
| parent | Merge tag 'net-5.19-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net (diff) | |
| download | linux-dev-93817be8b62c7fa1f1bdc3e8c037a73a60026be9.tar.xz linux-dev-93817be8b62c7fa1f1bdc3e8c037a73a60026be9.zip | |
Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net
No conflicts.
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to 'kernel/bpf/btf.c')
| -rw-r--r-- | kernel/bpf/btf.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/kernel/bpf/btf.c b/kernel/bpf/btf.c index f08037c31dd7..d003d4d8242a 100644 --- a/kernel/bpf/btf.c +++ b/kernel/bpf/btf.c @@ -4928,6 +4928,7 @@ static int btf_check_type_tags(struct btf_verifier_env *env, n = btf_nr_types(btf); for (i = start_id; i < n; i++) { const struct btf_type *t; + int chain_limit = 32; u32 cur_id = i; t = btf_type_by_id(btf, i); @@ -4940,6 +4941,10 @@ static int btf_check_type_tags(struct btf_verifier_env *env, in_tags = btf_type_is_type_tag(t); while (btf_type_is_modifier(t)) { + if (!chain_limit--) { + btf_verifier_log(env, "Max chain length or cycle detected"); + return -ELOOP; + } if (btf_type_is_type_tag(t)) { if (!in_tags) { btf_verifier_log(env, "Type tags don't precede modifiers"); |