linux-kernel - Re: [PATCH] tools lib api fs: fix gcc9 compilation error

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20191218113642.2hw5rx2t6f277b3b@pathway.suse.cz>
Date:   Wed, 18 Dec 2019 12:36:42 +0100
From:   Petr Mladek <pmladek@...e.com>
To:     Andrey Zhizhikin <andrey.z@...il.com>
Cc:     ast@...nel.org, daniel@...earbox.net, kafai@...com,
        songliubraving@...com, yhs@...com, andriin@...com,
        sergey.senozhatsky@...il.com, wangkefeng.wang@...wei.com,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        bpf@...r.kernel.org,
        Andrey Zhizhikin <andrey.zhizhikin@...ca-geosystems.com>,
        Arnaldo Carvalho de Melo <acme@...hat.com>,
        Jiri Olsa <jolsa@...nel.org>
Subject: Re: [PATCH] tools lib api fs: fix gcc9 compilation error

On Wed 2019-12-11 08:01:09, Andrey Zhizhikin wrote:
> GCC9 introduced string hardening mechanisms, which exhibits the error
> during fs api compilation:
> 
> error: '__builtin_strncpy' specified bound 4096 equals destination size
> [-Werror=stringop-truncation]
> 
> This comes when the length of copy passed to strncpy is is equal to
> destination size, which could potentially lead to buffer overflow.
> 
> There is a need to mitigate this potential issue by limiting the size of
> destination by 1 and explicitly terminate the destination with NULL.
> 
> Signed-off-by: Andrey Zhizhikin <andrey.zhizhikin@...ca-geosystems.com>
> Cc: Arnaldo Carvalho de Melo <acme@...hat.com>
> Cc: Jiri Olsa <jolsa@...nel.org>

Reviewed-by: Petr Mladek <pmladek@...e.com>

Best Regards,
Petr