diff mbox series

[bpf] bpf: fix do_misc_fixups() for bpf_get_branch_snapshot()

Message ID 20241023161916.2896274-1-andrii@kernel.org (mailing list archive)
State New
Delegated to: BPF
Headers show
Series [bpf] bpf: fix do_misc_fixups() for bpf_get_branch_snapshot() | expand

Checks

Context Check Description
netdev/series_format success Single patches do not need cover letters
netdev/tree_selection success Clearly marked for bpf
netdev/ynl success Generated files up to date; no warnings/errors; no diff in generated;
netdev/fixes_present success Fixes tag present in non-next series
netdev/header_inline success No static functions without inline keyword in header files
netdev/build_32bit success Errors and warnings before: 5 this patch: 5
netdev/build_tools success No tools touched, skip
netdev/cc_maintainers fail 2 blamed authors not CCed: john.fastabend@gmail.com yonghong.song@linux.dev; 9 maintainers not CCed: song@kernel.org haoluo@google.com john.fastabend@gmail.com sdf@fomichev.me martin.lau@linux.dev kpsingh@kernel.org yonghong.song@linux.dev eddyz87@gmail.com jolsa@kernel.org
netdev/build_clang success Errors and warnings before: 3 this patch: 3
netdev/verify_signedoff success Signed-off-by tag matches author and committer
netdev/deprecated_api success None detected
netdev/check_selftest success No net selftest shell script
netdev/verify_fixes success Fixes tag looks correct
netdev/build_allmodconfig_warn success Errors and warnings before: 14 this patch: 14
netdev/checkpatch success total: 0 errors, 0 warnings, 0 checks, 8 lines checked
netdev/build_clang_rust success No Rust files in patch. Skipping build
netdev/kdoc success Errors and warnings before: 0 this patch: 0
netdev/source_inline success Was 0 now: 0
bpf/vmtest-bpf-PR success PR summary
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Commit Message

Andrii Nakryiko Oct. 23, 2024, 4:19 p.m. UTC 
We need `goto next_insn;` at the end of patching instead of `continue;`.
It currently works by accident by making verifier re-process patched
instructions.

Reported-by: Shung-Hsi Yu <shung-hsi.yu@suse.com>
Fixes: 314a53623cd4 ("bpf: inline bpf_get_branch_snapshot() helper")
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
---
 kernel/bpf/verifier.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Comments

Yonghong Song Oct. 23, 2024, 5:11 p.m. UTC | #1 
On 10/23/24 9:19 AM, Andrii Nakryiko wrote:
> We need `goto next_insn;` at the end of patching instead of `continue;`.
> It currently works by accident by making verifier re-process patched
> instructions.
>
> Reported-by: Shung-Hsi Yu <shung-hsi.yu@suse.com>
> Fixes: 314a53623cd4 ("bpf: inline bpf_get_branch_snapshot() helper")
> Signed-off-by: Andrii Nakryiko <andrii@kernel.org>

Acked-by: Yonghong Song <yonghong.song@linux.dev>
diff mbox series

Patch

diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c
index f9e2f1cd4975..587a6c76e564 100644
--- a/kernel/bpf/verifier.c
+++ b/kernel/bpf/verifier.c
@@ -21210,7 +21210,7 @@  static int do_misc_fixups(struct bpf_verifier_env *env)
 			delta    += cnt - 1;
 			env->prog = prog = new_prog;
 			insn      = new_prog->insnsi + i + delta;
-			continue;
+			goto next_insn;
 		}
 
 		/* Implement bpf_kptr_xchg inline */