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

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Message-ID: <CAMuHMdWzLuVjA=8PMm3UPXXPUEwBQjnTmp_W9oi_KHCx=m-QZA@mail.gmail.com>
Date: Thu, 24 Apr 2025 09:34:14 +0200
From: Geert Uytterhoeven <geert@...ux-m68k.org>
To: Arnd Bergmann <arnd@...nel.org>
Cc: Joerg Roedel <joro@...tes.org>, Will Deacon <will@...nel.org>, 
	Magnus Damm <damm+renesas@...nsource.se>, Arnd Bergmann <arnd@...db.de>, 
	Robin Murphy <robin.murphy@....com>, Jason Gunthorpe <jgg@...pe.ca>, Lu Baolu <baolu.lu@...ux.intel.com>, 
	Vasant Hegde <vasant.hegde@....com>, iommu@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] iommu: ipmmu-vmsa: avoid Wformat-security warning

On Wed, 23 Apr 2025 at 18:43, Arnd Bergmann <arnd@...nel.org> wrote:
> 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>

Reviewed-by: Geert Uytterhoeven <geert+renesas@...der.be>

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds