linux-kernel - Re: [PATCH v1 1/1] seq_file: Replace strncpy()+nul by strscpy()

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Date:   Mon, 17 Jul 2023 16:09:23 -0700
From:   Kees Cook <keescook@...omium.org>
To:     linux-kernel@...r.kernel.org,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc:     Kees Cook <keescook@...omium.org>
Subject: Re: [PATCH v1 1/1] seq_file: Replace strncpy()+nul by strscpy()


On Mon, 17 Jul 2023 12:33:32 +0300, Andy Shevchenko wrote:
> Privided seq_show_option_n() macro breaks build with -Werror
> and W=1, e.g.:
> 
> In function ‘strncpy’,
>     inlined from ‘ocfs2_show_options’ at fs/ocfs2/super.c:1520:3:
> include/linux/fortify-string.h:68:33: error: ‘__builtin_strncpy’ output may be truncated copying 4 bytes from a string of length 4 [-Werror=stringop-truncation]
>    68 | #define __underlying_strncpy    __builtin_strncpy
>       |                                 ^
> include/linux/fortify-string.h:151:16: note: in expansion of macro ‘__underlying_strncpy’
>   151 |         return __underlying_strncpy(p, q, size);
>       |                ^~~~~~~~~~~~~~~~~~~~
> cc1: all warnings being treated as errors
> 
> [...]

Applied, thanks!

[1/1] seq_file: Replace strncpy()+nul by strscpy()
      https://git.kernel.org/kees/c/c30417b20f49

Best regards,
-- 
Kees Cook