linux-kernel - Re: include/linux/fortify-string.h:267:25: warning: call to '__write_overflow_field' declared with attribute warning: detected write beyond size of field (1st parameter); maybe use struct

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Message-ID: <202204182118.5EB742C6@keescook>
Date:   Mon, 18 Apr 2022 21:19:09 -0700
From:   Kees Cook <keescook@...omium.org>
To:     kernel test robot <lkp@...el.com>
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org
Subject: Re: include/linux/fortify-string.h:267:25: warning: call to
 '__write_overflow_field' declared with attribute warning: detected write
 beyond size of field (1st parameter); maybe use struct_group()?

On Thu, Apr 14, 2022 at 11:54:03PM +0800, kernel test robot wrote:
>    In function 'fortify_memcpy_chk',
>        inlined from 'firm_send_command' at drivers/usb/serial/whiteheat.c:587:4:
> >> include/linux/fortify-string.h:267:25: warning: call to '__write_overflow_field' declared with attribute warning: detected write beyond size of field (1st parameter); maybe use struct_group()? [-Wattribute-warning]
>      267 |                         __write_overflow_field(p_size_field, size);
>          |                         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Thanks! Proposed patch:
https://lore.kernel.org/linux-hardening/20220419041742.4117026-1-keescook@chromium.org/

-- 
Kees Cook