linux-kernel - Re: linux-next: Tree for May 16 (security/landlock/ruleset.c)

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Message-ID: <20250519.jiveise8Rau8@digikod.net>
Date: Mon, 19 May 2025 17:29:30 +0200
From: Mickaël Salaün <mic@...ikod.net>
To: Randy Dunlap <rdunlap@...radead.org>
Cc: Stephen Rothwell <sfr@...b.auug.org.au>, 
	Linux Next Mailing List <linux-next@...r.kernel.org>, Linux Kernel Mailing List <linux-kernel@...r.kernel.org>, 
	linux-security-module@...r.kernel.org, Kees Cook <kees@...nel.org>, 
	Günther Noack <gnoack@...gle.com>
Subject: Re: linux-next: Tree for May 16 (security/landlock/ruleset.c)

On Fri, May 16, 2025 at 07:54:14PM -0700, Randy Dunlap wrote:
> 
> 
> On 5/16/25 3:24 AM, Stephen Rothwell wrote:
> > Hi all,
> > 
> > Changes since 20250515:

Thanks for the report.

It is the same warning as reported here:
https://lore.kernel.org/all/202501040747.S3LYfvYq-lkp@intel.com/

I don't know what the actual issue is though.

> 
> on i386:
> 
> In file included from ../arch/x86/include/asm/string.h:3,
>                  from ../include/linux/string.h:65,
>                  from ../include/linux/bitmap.h:13,
>                  from ../include/linux/cpumask.h:12,
>                  from ../include/linux/smp.h:13,
>                  from ../include/linux/lockdep.h:14,
>                  from ../security/landlock/ruleset.c:16:
> ../security/landlock/ruleset.c: In function 'create_rule':
> ../arch/x86/include/asm/string_32.h:150:25: warning: '__builtin_memcpy' accessing 4294967295 bytes at offsets 20 and 0 overlaps 6442450943 bytes at offset -2147483648 [-Wrestrict]
>   150 | #define memcpy(t, f, n) __builtin_memcpy(t, f, n)
>       |                         ^~~~~~~~~~~~~~~~~~~~~~~~~
> ../security/landlock/ruleset.c:137:9: note: in expansion of macro 'memcpy'
>   137 |         memcpy(new_rule->layers, layers,
>       |         ^~~~~~
> 
> 
> Full randconfig file is attached.
> 
> -- 
> ~Randy