linux-kernel - [PATCH] iommu: ipmmu-vmsa: avoid Wformat-security warning

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-next>] [day] [month] [year] [list]

Message-Id: <20250423164006.2661372-1-arnd@kernel.org>
Date: Wed, 23 Apr 2025 18:40:02 +0200
From: Arnd Bergmann <arnd@...nel.org>
To: Joerg Roedel <joro@...tes.org>,
	Will Deacon <will@...nel.org>,
	Magnus Damm <damm+renesas@...nsource.se>
Cc: Arnd Bergmann <arnd@...db.de>,
	Robin Murphy <robin.murphy@....com>,
	Jason Gunthorpe <jgg@...pe.ca>,
	Geert Uytterhoeven <geert+renesas@...der.be>,
	Lu Baolu <baolu.lu@...ux.intel.com>,
	Vasant Hegde <vasant.hegde@....com>,
	iommu@...ts.linux.dev,
	linux-kernel@...r.kernel.org
Subject: [PATCH] iommu: ipmmu-vmsa: avoid Wformat-security warning

From: Arnd Bergmann <arnd@...db.de>

iommu_device_sysfs_add() requires a constant format string, otherwise
a W=1 build produces a warning:

drivers/iommu/ipmmu-vmsa.c:1093:62: error: format string is not a string literal (potentially insecure) [-Werror,-Wformat-security]
 1093 |         ret = iommu_device_sysfs_add(&mmu->iommu, &pdev->dev, NULL, dev_name(&pdev->dev));
      |                                                                     ^~~~~~~~~~~~~~~~~~~~
drivers/iommu/ipmmu-vmsa.c:1093:62: note: treat the string as an argument to avoid this
 1093 |         ret = iommu_device_sysfs_add(&mmu->iommu, &pdev->dev, NULL, dev_name(&pdev->dev));
      |                                                                     ^
      |                                                                     "%s",

This was an old bug but I saw it now because the code was changed as part
of commit d9d3cede4167 ("iommu/ipmmu-vmsa: Register in a sensible order").

Fixes: 7af9a5fdb9e0 ("iommu/ipmmu-vmsa: Use iommu_device_sysfs_add()/remove()")
Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 drivers/iommu/ipmmu-vmsa.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/iommu/ipmmu-vmsa.c b/drivers/iommu/ipmmu-vmsa.c
index e424b279a8cd..90341b24a811 100644
--- a/drivers/iommu/ipmmu-vmsa.c
+++ b/drivers/iommu/ipmmu-vmsa.c
@@ -1090,7 +1090,8 @@ static int ipmmu_probe(struct platform_device *pdev)
 	if (mmu->features->has_cache_leaf_nodes && ipmmu_is_root(mmu))
 		return 0;
 
-	ret = iommu_device_sysfs_add(&mmu->iommu, &pdev->dev, NULL, dev_name(&pdev->dev));
+	ret = iommu_device_sysfs_add(&mmu->iommu, &pdev->dev, NULL, "%s",
+				     dev_name(&pdev->dev));
 	if (ret)
 		return ret;
 
-- 
2.39.5