diff mbox series

[bpf-next,v1] bpf: abort verification if env->cur_state->loop_entry != NULL

Message ID 20250225003838.135319-1-eddyz87@gmail.com (mailing list archive)
State New
Delegated to: BPF
Headers show
Series [bpf-next,v1] bpf: abort verification if env->cur_state->loop_entry != NULL | expand

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netdev/header_inline success No static functions without inline keyword in header files
netdev/build_32bit success Errors and warnings before: 0 this patch: 0
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netdev/build_clang success Errors and warnings before: 0 this patch: 0
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Commit Message

Eduard Zingerman Feb. 25, 2025, 12:38 a.m. UTC 
In addition to warning abort verification with -EFAULT.
If env->cur_state->loop_entry != NULL something is irrecoverably
buggy.

Fixes: bbbc02b7445e ("bpf: copy_verifier_state() should copy 'loop_entry' field")
Suggested-by: Andrii Nakryiko <andrii.nakryiko@gmail.com>
Signed-off-by: Eduard Zingerman <eddyz87@gmail.com>
---
 kernel/bpf/verifier.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

Comments

Andrii Nakryiko Feb. 25, 2025, 1:03 a.m. UTC | #1 
On Mon, Feb 24, 2025 at 4:39 PM Eduard Zingerman <eddyz87@gmail.com> wrote:
>
> In addition to warning abort verification with -EFAULT.
> If env->cur_state->loop_entry != NULL something is irrecoverably
> buggy.
>
> Fixes: bbbc02b7445e ("bpf: copy_verifier_state() should copy 'loop_entry' field")
> Suggested-by: Andrii Nakryiko <andrii.nakryiko@gmail.com>
> Signed-off-by: Eduard Zingerman <eddyz87@gmail.com>
> ---
>  kernel/bpf/verifier.c | 6 ++++--
>  1 file changed, 4 insertions(+), 2 deletions(-)
>

that works as well, thanks

Acked-by: Andrii Nakryiko <andrii@kernel.org>

> diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c
> index 5c9b7464ec2c..942c0d2df258 100644
> --- a/kernel/bpf/verifier.c
> +++ b/kernel/bpf/verifier.c
> @@ -19340,8 +19340,10 @@ static int do_check(struct bpf_verifier_env *env)
>                                                 return err;
>                                         break;
>                                 } else {
> -                                       if (WARN_ON_ONCE(env->cur_state->loop_entry))
> -                                               env->cur_state->loop_entry = NULL;
> +                                       if (WARN_ON_ONCE(env->cur_state->loop_entry)) {
> +                                               verbose(env, "verifier bug: env->cur_state->loop_entry != NULL\n");
> +                                               return -EFAULT;
> +                                       }
>                                         do_print_state = true;
>                                         continue;
>                                 }
> --
> 2.48.1
>
diff mbox series

Patch

diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c
index 5c9b7464ec2c..942c0d2df258 100644
--- a/kernel/bpf/verifier.c
+++ b/kernel/bpf/verifier.c
@@ -19340,8 +19340,10 @@  static int do_check(struct bpf_verifier_env *env)
 						return err;
 					break;
 				} else {
-					if (WARN_ON_ONCE(env->cur_state->loop_entry))
-						env->cur_state->loop_entry = NULL;
+					if (WARN_ON_ONCE(env->cur_state->loop_entry)) {
+						verbose(env, "verifier bug: env->cur_state->loop_entry != NULL\n");
+						return -EFAULT;
+					}
 					do_print_state = true;
 					continue;
 				}