linux-kernel - Re: [PATCH v2 2/4] fs/exec: use strscpy instead of strlcpy in __set_task

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Message-ID: <202110070751.929BA101@keescook>
Date:   Thu, 7 Oct 2021 07:52:16 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Yafang Shao <laoar.shao@...il.com>
Cc:     pmladek@...e.com, viro@...iv.linux.org.uk,
        akpm@...ux-foundation.org, peterz@...radead.org,
        valentin.schneider@....com, mathieu.desnoyers@...icios.com,
        qiang.zhang@...driver.com, robdclark@...omium.org,
        christian@...uner.io, dietmar.eggemann@....com, mingo@...hat.com,
        juri.lelli@...hat.com, vincent.guittot@...aro.org,
        rostedt@...dmis.org, bsegall@...gle.com, mgorman@...e.de,
        bristot@...hat.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 2/4] fs/exec: use strscpy instead of strlcpy in
 __set_task_comm

On Thu, Oct 07, 2021 at 12:07:50PM +0000, Yafang Shao wrote:
> Fix a warning by checkpatch -
> WARNING: Prefer strscpy over strlcpy - see: https://lore.kernel.org/r/CAHk-=wgfRnXz0W3D37d01q3JFkr_i_uTL=V6A6G1oUZcprmknw@mail.gmail.com/
> 
> Signed-off-by: Yafang Shao <laoar.shao@...il.com>
> Cc: Kees Cook <keescook@...omium.org>
> Cc: Al Viro <viro@...iv.linux.org.uk>
> Cc: Petr Mladek <pmladek@...e.com>

Acked-by: Kees Cook <keescook@...omium.org>

> ---
>  fs/exec.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/fs/exec.c b/fs/exec.c
> index a098c133d8d7..de804c566200 100644
> --- a/fs/exec.c
> +++ b/fs/exec.c
> @@ -1224,7 +1224,7 @@ void __set_task_comm(struct task_struct *tsk, const char *buf, bool exec)
>  {
>  	task_lock(tsk);
>  	trace_task_rename(tsk, buf);
> -	strlcpy(tsk->comm, buf, sizeof(tsk->comm));
> +	strscpy(tsk->comm, buf, sizeof(tsk->comm));
>  	task_unlock(tsk);
>  	perf_event_comm(tsk, exec);
>  }
> -- 
> 2.18.2
> 

-- 
Kees Cook