From: Sebastian Andrzej Siewior bigeasy@linutronix.de
mainline inclusion from mainline-v6.11-rc1 commit c13fda93aca118b8e5cd202e339046728ee7dddb category: bugfix bugzilla: https://gitee.com/src-openeuler/kernel/issues/IARX44 CVE: CVE-2024-46754
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?i...
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The syzbot reported that the lwt_seg6 related BPF ops can be invoked via bpf_test_run() without without entering input_action_end_bpf() first.
Martin KaFai Lau said that self test for BPF_PROG_TYPE_LWT_SEG6LOCAL probably didn't work since it was introduced in commit 04d4b274e2a ("ipv6: sr: Add seg6local action End.BPF"). The reason is that the per-CPU variable seg6_bpf_srh_states::srh is never assigned in the self test case but each BPF function expects it.
Remove test_run for BPF_PROG_TYPE_LWT_SEG6LOCAL.
Suggested-by: Martin KaFai Lau martin.lau@linux.dev Reported-by: syzbot+608a2acde8c5a101d07d@syzkaller.appspotmail.com Fixes: d1542d4ae4df ("seg6: Use nested-BH locking for seg6_bpf_srh_states.") Fixes: 004d4b274e2a ("ipv6: sr: Add seg6local action End.BPF") Signed-off-by: Sebastian Andrzej Siewior bigeasy@linutronix.de Acked-by: Daniel Borkmann daniel@iogearbox.net Link: https://lore.kernel.org/r/20240710141631.FbmHcQaX@linutronix.de Signed-off-by: Martin KaFai Lau martin.lau@kernel.org Signed-off-by: Liu Jian liujian56@huawei.com --- net/core/filter.c | 1 - 1 file changed, 1 deletion(-)
diff --git a/net/core/filter.c b/net/core/filter.c index 8a61914d35c5..3cdca0279b2d 100644 --- a/net/core/filter.c +++ b/net/core/filter.c @@ -9881,7 +9881,6 @@ const struct bpf_verifier_ops lwt_seg6local_verifier_ops = { };
const struct bpf_prog_ops lwt_seg6local_prog_ops = { - .test_run = bpf_prog_test_run_skb, };
const struct bpf_verifier_ops cg_sock_verifier_ops = {