netdev - Re: [PATCH 08/20] tools lib api fs: Fix gcc9 stringop-truncation compilation error

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Date:   Tue, 7 Jan 2020 10:16:50 +0100
From:   Petr Mladek <pmladek@...e.com>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     Ingo Molnar <mingo@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Clark Williams <williams@...hat.com>,
        linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org,
        Andrey Zhizhikin <andrey.z@...il.com>,
        Andrey Zhizhikin <andrey.zhizhikin@...ca-geosystems.com>,
        Alexei Starovoitov <ast@...nel.org>,
        Andrii Nakryiko <andriin@...com>,
        Daniel Borkmann <daniel@...earbox.net>,
        Kefeng Wang <wangkefeng.wang@...wei.com>,
        Martin KaFai Lau <kafai@...com>,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        bpf@...r.kernel.org, netdev@...r.kernel.org,
        Arnaldo Carvalho de Melo <acme@...hat.com>
Subject: Re: [PATCH 08/20] tools lib api fs: Fix gcc9 stringop-truncation
 compilation error

On Mon 2020-01-06 13:06:53, Arnaldo Carvalho de Melo wrote:
> From: Andrey Zhizhikin <andrey.z@...il.com>
> 
> 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>
> Reviewed-by: Petr Mladek <pmladek@...e.com>
> Acked-by: Jiri Olsa <jolsa@...nel.org>
> Cc: Alexei Starovoitov <ast@...nel.org>
> Cc: Andrii Nakryiko <andriin@...com>
> Cc: Daniel Borkmann <daniel@...earbox.net>
> Cc: Kefeng Wang <wangkefeng.wang@...wei.com>
> Cc: Martin KaFai Lau <kafai@...com>
> Cc: Petr Mladek <pmladek@...e.com>
> Cc: Sergey Senozhatsky <sergey.senozhatsky@...il.com>
> Cc: Song Liu <songliubraving@...com>
> Cc: Yonghong Song <yhs@...com>
> Cc: bpf@...r.kernel.org
> Cc: netdev@...r.kernel.org
> Link: http://lore.kernel.org/lkml/20191211080109.18765-1-andrey.zhizhikin@leica-geosystems.com
> Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>

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

Best Regards,
Petr