From: Puranjay Mohan <puranjay@kernel.org>
To: bpf@vger.kernel.org
Cc: Puranjay Mohan <puranjay@kernel.org>,
Puranjay Mohan <puranjay12@gmail.com>,
Alexei Starovoitov <ast@kernel.org>,
Andrii Nakryiko <andrii@kernel.org>,
Daniel Borkmann <daniel@iogearbox.net>,
Martin KaFai Lau <martin.lau@kernel.org>,
Eduard Zingerman <eddyz87@gmail.com>,
Kumar Kartikeya Dwivedi <memxor@gmail.com>,
"Emil Tsalapatis" <emil@etsalapatis.com>,
kernel-team@meta.com
Subject: [PATCH bpf-next v3 07/10] selftests: bpf: Update failure message for rbtree_fail
Date: Fri, 2 Jan 2026 10:00:33 -0800 [thread overview]
Message-ID: <20260102180038.2708325-8-puranjay@kernel.org> (raw)
In-Reply-To: <20260102180038.2708325-1-puranjay@kernel.org>
The rbtree_api_use_unchecked_remove_retval() selftest passes a pointer
received from bpf_rbtree_remove() to bpf_rbtree_add() without checking
for NULL, this was earlier caught by __check_ptr_off_reg() in the
verifier. Now the verifier assumes every kfunc only takes trusted pointer
arguments, so it catches this NULL pointer earlier in the path and
provides a more accurate failure message.
Acked-by: Eduard Zingerman <eddyz87@gmail.com>
Reviewed-by: Emil Tsalapatis <emil@etsalapatis.com>
Signed-off-by: Puranjay Mohan <puranjay@kernel.org>
---
tools/testing/selftests/bpf/progs/rbtree_fail.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/tools/testing/selftests/bpf/progs/rbtree_fail.c b/tools/testing/selftests/bpf/progs/rbtree_fail.c
index 4acb6af2dfe3..70b7baf9304b 100644
--- a/tools/testing/selftests/bpf/progs/rbtree_fail.c
+++ b/tools/testing/selftests/bpf/progs/rbtree_fail.c
@@ -153,7 +153,7 @@ long rbtree_api_add_to_multiple_trees(void *ctx)
}
SEC("?tc")
-__failure __msg("dereference of modified ptr_or_null_ ptr R2 off=16 disallowed")
+__failure __msg("Possibly NULL pointer passed to trusted arg1")
long rbtree_api_use_unchecked_remove_retval(void *ctx)
{
struct bpf_rb_node *res;
--
2.47.3
next prev parent reply other threads:[~2026-01-02 18:01 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-01-02 18:00 [PATCH bpf-next v3 00/10] bpf: Make KF_TRUSTED_ARGS default Puranjay Mohan
2026-01-02 18:00 ` [PATCH bpf-next v3 01/10] bpf: Make KF_TRUSTED_ARGS the default for all kfuncs Puranjay Mohan
2026-01-02 18:00 ` [PATCH bpf-next v3 02/10] bpf: Remove redundant KF_TRUSTED_ARGS flag from " Puranjay Mohan
2026-01-02 18:00 ` [PATCH bpf-next v3 03/10] bpf: net: netfilter: drop dead NULL checks Puranjay Mohan
2026-01-02 18:00 ` [PATCH bpf-next v3 04/10] bpf: xfrm: drop dead NULL check in bpf_xdp_get_xfrm_state() Puranjay Mohan
2026-01-02 18:00 ` [PATCH bpf-next v3 05/10] HID: bpf: drop dead NULL checks in kfuncs Puranjay Mohan
2026-01-02 18:00 ` [PATCH bpf-next v3 06/10] selftests: bpf: Update kfunc_param_nullable test for new error message Puranjay Mohan
2026-01-02 18:00 ` Puranjay Mohan [this message]
2026-01-02 18:00 ` [PATCH bpf-next v3 08/10] selftests: bpf: fix test_kfunc_dynptr_param Puranjay Mohan
2026-01-02 18:00 ` [PATCH bpf-next v3 09/10] selftests: bpf: fix cgroup_hierarchical_stats Puranjay Mohan
2026-01-02 18:00 ` [PATCH bpf-next v3 10/10] selftests: bpf: Fix test_bpf_nf for trusted args becoming default Puranjay Mohan
2026-01-02 20:20 ` [PATCH bpf-next v3 00/10] bpf: Make KF_TRUSTED_ARGS default patchwork-bot+netdevbpf
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