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

[Paul Moore]

On Mon, Dec 2, 2024 at 10:19 PM Zhuo, Qiuxu <qiuxu.zhuo@xxxxxxxxx> 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@xxxxxxxxxxxxxx/

> 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();
>    ^~~~~~~~~~~~~~~~~~

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