linux-kernel - 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)

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Message-Id: <29ab783d-86e2-4528-a6ad-083f8baf56d1@app.fastmail.com>
Date: Tue, 26 Nov 2024 16:12:45 +0100
From: "Arnd Bergmann" <arnd@...db.de>
To: "Naresh Kamboju" <naresh.kamboju@...aro.org>, audit@...r.kernel.org,
 "open list" <linux-kernel@...r.kernel.org>, lkft-triage@...ts.linaro.org,
 "Linux Regressions" <regressions@...ts.linux.dev>
Cc: "Eric Paris" <eparis@...hat.com>, "Paul Moore" <paul@...l-moore.com>,
 "Dan Carpenter" <dan.carpenter@...aro.org>,
 "Anders Roxell" <anders.roxell@...aro.org>,
 "Yafang Shao" <laoar.shao@...il.com>
Subject: 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)

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