From nobody Wed Dec 17 16:01:14 2025 Received: from mout-p-201.mailbox.org (mout-p-201.mailbox.org [80.241.56.171]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 5428728C5BE; Wed, 1 Oct 2025 09:57:02 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=80.241.56.171 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1759312624; cv=none; b=W8cGGHtPysRzzEsSFcdI2Hbt4+AQCg6JBaaGfLvExbWYKZiY/XvXAkwgZYzAGgNm5OBZvo4FNkUsQELp/Us8Q8Net/ZThEQqGgKDezpVN3ZG1j2AR5RfICrXIJEUBBUO/3Z++e/UneGduc6ZRpcc6qaAw9ZChWAN/HcbQUQ54Vg= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1759312624; c=relaxed/simple; bh=HLYhW50XHaRj/9ZRdiTUSGg8dvCftmf3opE4NOaKOFI=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=AudaG/hHzWMeyJMIPbpnUrkLodcIH3jurgSlEp66XSnhRLYA1OzgZonSPkV0LhXYgOGrhHrLqBE8JCkj6qZbEfom3pU71vz5NRxKsDuQdy38BzT7MxvhsayhUOXJICL0AaPxFgxlwYH1KkZvSa6r+S1jqCrwjJHJZwjo3i3U6U8= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=listout.xyz; spf=pass smtp.mailfrom=listout.xyz; dkim=pass (2048-bit key) header.d=listout.xyz header.i=@listout.xyz header.b=OPaM3tXx; arc=none smtp.client-ip=80.241.56.171 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=listout.xyz Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=listout.xyz Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=listout.xyz header.i=@listout.xyz header.b="OPaM3tXx" Received: from smtp2.mailbox.org (smtp2.mailbox.org [10.196.197.2]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) by mout-p-201.mailbox.org (Postfix) with ESMTPS id 4cc9Ly46cPz9svd; Wed, 1 Oct 2025 11:56:58 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=listout.xyz; s=MBO0001; t=1759312618; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=mFOt7Q6Yh4zU6HGqC4KBvS7uM2NDq7KoM7BsVGIWIDU=; b=OPaM3tXxwqFYeforC7OSLfoe/1PgSh+M/aTg91Y5lVIqrdZ9ek6cvWUBeZmiOPZYs/PU/5 S5VLqHOdIOa95yPe1isUIonMsGV+Gjmr9TdzK4MrziRzgcDYqSjVV/iLXa+7nUFEJ3o+17 jvKSHGCF37sET/Ab9jBb1Ypp0vJ2KaeOCjMKzFPWbjnndxiNep7BDC+H3goBjTurrAh8Mh w0jF1QsacIW2C73/SeLFOD0kpvB2aw4RWmvbhQhuvQavYCO3awMe9FBj78DoG8hBJDxUt+ 1WVoF7gpqkySf/X+HOKLdPx2skzxR334X03l81GflKkAJ1kKUL6YJEuch5zbxw== From: Brahmajit Das To: syzbot+d36d5ae81e1b0a53ef58@syzkaller.appspotmail.com Cc: andrii@kernel.org, ast@kernel.org, bpf@vger.kernel.org, daniel@iogearbox.net, eddyz87@gmail.com, haoluo@google.com, john.fastabend@gmail.com, jolsa@kernel.org, kpsingh@kernel.org, linux-kernel@vger.kernel.org, martin.lau@linux.dev, sdf@fomichev.me, song@kernel.org, syzkaller-bugs@googlegroups.com, yonghong.song@linux.dev, kafai.wan@linux.dev Subject: [PATCH v3 2/2] selftests/bpf: Add test for BPF_NEG alu on CONST_PTR_TO_MAP Date: Wed, 1 Oct 2025 15:26:13 +0530 Message-ID: <20251001095613.267475-3-listout@listout.xyz> In-Reply-To: <20251001095613.267475-1-listout@listout.xyz> References: <68d26227.a70a0220.1b52b.02a4.GAE@google.com> <20251001095613.267475-1-listout@listout.xyz> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" From: KaFai Wan Add a test case for BPF_NEG operation on CONST_PTR_TO_MAP. Tests if BPF_NEG operation on map_ptr is rejected in unprivileged mode and is a scalar value and do not trigger Oops in privileged mode. Signed-off-by: KaFai Wan Acked-by: Eduard Zingerman --- .../bpf/progs/verifier_value_illegal_alu.c | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+) diff --git a/tools/testing/selftests/bpf/progs/verifier_value_illegal_alu.c= b/tools/testing/selftests/bpf/progs/verifier_value_illegal_alu.c index a9ab37d3b9e2..dcaab61a11a0 100644 --- a/tools/testing/selftests/bpf/progs/verifier_value_illegal_alu.c +++ b/tools/testing/selftests/bpf/progs/verifier_value_illegal_alu.c @@ -146,6 +146,24 @@ l0_%=3D: exit; \ : __clobber_all); } =20 +SEC("socket") +__description("map_ptr illegal alu op, map_ptr =3D -map_ptr") +__failure __msg("R0 invalid mem access 'scalar'") +__failure_unpriv __msg_unpriv("R0 pointer arithmetic prohibited") +__flag(BPF_F_ANY_ALIGNMENT) +__naked void map_ptr_illegal_alu_op(void) +{ + asm volatile (" \ + r0 =3D %[map_hash_48b] ll; \ + r0 =3D -r0; \ + r1 =3D 22; \ + *(u64*)(r0 + 0) =3D r1; \ + exit; \ +" : + : __imm_addr(map_hash_48b) + : __clobber_all); +} + SEC("flow_dissector") __description("flow_keys illegal alu op with variable offset") __failure __msg("R7 pointer arithmetic on flow_keys prohibited") --=20 2.51.0