Re: include/linux/fortify-string.h:293:17: error: call to '__write_overflow' declared with attribute error: detected write beyond size of object (1st parameter)

["Arnd Bergmann" <arnd@arndb.de>]

On Tue, Nov 26, 2024, at 15:58, Naresh Kamboju wrote:
> Build error:
> ---------
> In function 'sized_strscpy',
>     inlined from '__audit_ptrace' at kernel/auditsc.c:2732:2:
> include/linux/fortify-string.h:293:17: error: call to
> '__write_overflow' declared with attribute error: detected write
> beyond size of object (1st parameter)
>   293 |                 __write_overflow();
>       |                 ^~~~~~~~~~~~~~~~~~
> In function 'sized_strscpy',
>     inlined from 'audit_signal_info_syscall' at kernel/auditsc.c:2759:3:
> include/linux/fortify-string.h:293:17: error: call to
> '__write_overflow' declared with attribute error: detected write
> beyond size of object (1st parameter)
>   293 |                 __write_overflow();
>       |                 ^~~~~~~~~~~~~~~~~~
> make[4]: *** [scripts/Makefile.build:229: kernel/auditsc.o] Error 1

I have run into this specific one before but failed to
come up with a working fix.

I think the specific warning started with

https://lore.kernel.org/all/20240828030321.20688-3-laoar.shao@gmail.com/

but reverting that just replaces it with a slightly different
warning. In my randconfig tree I have a patch that comments out
the two security_task_getlsmprop_obj(), and I don't think I get
warnings at the moment, but I no longer see why I would have done
that.

      Arnd