linux-hardening - Re: v6.13-rc1 build errors from kernel/auditsc.c

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Message-ID: <CAHC9VhR6t_LLB5nc=kqqE5FpN4ftxZYidQ8F5x1Lzowf1H9juw@mail.gmail.com>
Date: Mon, 2 Dec 2024 22:35:15 -0500
From: Paul Moore <paul@...l-moore.com>
To: "Zhuo, Qiuxu" <qiuxu.zhuo@...el.com>, Kees Cook <keescook@...omium.org>, 
	Yafang Shao <laoar.shao@...il.com>
Cc: Eric Paris <eparis@...hat.com>, "audit@...r.kernel.org" <audit@...r.kernel.org>, 
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, linux-hardening@...r.kernel.org
Subject: Re: v6.13-rc1 build errors from kernel/auditsc.c

On Mon, Dec 2, 2024 at 10:19 PM Zhuo, Qiuxu <qiuxu.zhuo@...el.com> wrote:
>
> Hi,
>
> I got the following build errors from kernel/auditsc.c file.
>
> The GCC version      : 7.5.0
> Kernel version         : v6.13-rc1
> The bisect commit : 286d7a54c8a2 ("auditsc: replace memcpy() with strscpy()")

Unfortunately this is a known GCC bug, see the lore link below.  Kees,
Yafang, do you have any more information or compiler-based workarounds
for this bug?

https://lore.kernel.org/all/CALOAHbBB-__eyERw82QnS3Wmgi7_BpPaacY2urVmpWX3ZkVtvQ@mail.gmail.com/

> Build error logs:
>
>                  from kernel/auditsc.c:37:
> In function ‘sized_strscpy’,
>     inlined from ‘__audit_ptrace’ at kernel/auditsc.c:2732:2:
> ./include/linux/fortify-string.h:293:3: error: call to ‘__write_overflow’ declared with attribute error: detected write beyond size of object (1st parameter)
>    __write_overflow();
>    ^~~~~~~~~~~~~~~~~~
> In function ‘sized_strscpy’,
>     inlined from ‘audit_signal_info_syscall’ at kernel/auditsc.c:2759:3:
> ./include/linux/fortify-string.h:293:3: error: call to ‘__write_overflow’ declared with attribute error: detected write beyond size of object (1st parameter)
>    __write_overflow();
>    ^~~~~~~~~~~~~~~~~~

-- 
paul-moore.com