linux-kernel - [PATCH rc 3/4] iommufd/selftest: Add asserts testing global mfd

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <03ad77076f50a1931b08cdaa37c3a0e11038a934.1750049883.git.nicolinc@nvidia.com>
Date: Sun, 15 Jun 2025 22:02:05 -0700
From: Nicolin Chen <nicolinc@...dia.com>
To: <jgg@...dia.com>, <kevin.tian@...el.com>
CC: <shuah@...nel.org>, <joao.m.martins@...cle.com>,
	<steven.sistare@...cle.com>, <iommu@...ts.linux.dev>,
	<linux-kselftest@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<thomas.weissschuh@...utronix.de>
Subject: [PATCH rc 3/4] iommufd/selftest: Add asserts testing global mfd

The mfd and mfd_buffer will be used in the tests directly without an extra
check. Test them in setup_sizes() to ensure they are safe to use.

Fixes: 0bcceb1f51c7 ("iommufd: Selftest coverage for IOMMU_IOAS_MAP_FILE")
Cc: stable@...r.kernel.org
Signed-off-by: Nicolin Chen <nicolinc@...dia.com>
---
 tools/testing/selftests/iommu/iommufd.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/tools/testing/selftests/iommu/iommufd.c b/tools/testing/selftests/iommu/iommufd.c
index 602f8540242b..393d95f88ad4 100644
--- a/tools/testing/selftests/iommu/iommufd.c
+++ b/tools/testing/selftests/iommu/iommufd.c
@@ -55,6 +55,8 @@ static __attribute__((constructor)) void setup_sizes(void)
 
 	mfd_buffer = memfd_mmap(BUFFER_SIZE, PROT_READ | PROT_WRITE, MAP_SHARED,
 				&mfd);
+	assert(mfd_buffer != MAP_FAILED);
+	assert(mfd > 0);
 }
 
 FIXTURE(iommufd)
-- 
2.43.0