linux-kernel - [PATCH v4 0/2] bpf: Fix verifier crash on BPF

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Message-ID: <20251001192859.2343567-1-listout@listout.xyz>
Date: Thu,  2 Oct 2025 00:58:57 +0530
From: Brahmajit Das <listout@...tout.xyz>
To: syzbot+d36d5ae81e1b0a53ef58@...kaller.appspotmail.com
Cc: andrii@...nel.org,
	ast@...nel.org,
	bpf@...r.kernel.org,
	daniel@...earbox.net,
	eddyz87@...il.com,
	haoluo@...gle.com,
	john.fastabend@...il.com,
	jolsa@...nel.org,
	kpsingh@...nel.org,
	linux-kernel@...r.kernel.org,
	martin.lau@...ux.dev,
	sdf@...ichev.me,
	song@...nel.org,
	syzkaller-bugs@...glegroups.com,
	yonghong.song@...ux.dev
Subject: [PATCH v4 0/2] bpf: Fix verifier crash on BPF_NEG with pointer register

This patch fixes a crash in the BPF verifier triggered when the BPF_NEG
operation is applied to a pointer-typed register. The verifier now
checks that the destination register is not a pointer before performing
the operation.

Tested with syzkaller reproducer and new BPF sefltest.
Closes: https://syzkaller.appspot.com/bug?extid=d36d5ae81e1b0a53ef58

Brahmajit Das (1):
  bpf: Skip scalar adjustment for BPF_NEG if dst is a pointer

KaFai Wan (1):
  selftests/bpf: Add test for BPF_NEG alu on CONST_PTR_TO_MAP

 kernel/bpf/verifier.c                          |  3 ++-
 .../bpf/progs/verifier_value_illegal_alu.c     | 18 ++++++++++++++++++
 2 files changed, 20 insertions(+), 1 deletion(-)

-- 
2.51.0