[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-ID: <202309200836.372F9757@keescook>
Date: Wed, 20 Sep 2023 08:36:51 -0700
From: Kees Cook <keescook@...omium.org>
To: Justin Stitt <justinstitt@...gle.com>
Cc: Justin Sanders <justin@...aid.com>, Jens Axboe <axboe@...nel.dk>,
linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-hardening@...r.kernel.org, Xu Panda <xu.panda@....com.cn>,
Yang Yang <yang.yang29@....com>
Subject: Re: [PATCH v2] aoe: replace strncpy with strscpy
On Tue, Sep 19, 2023 at 05:27:45AM +0000, Justin Stitt wrote:
> `strncpy` is deprecated for use on NUL-terminated destination strings [1].
>
> `aoe_iflist` is expected to be NUL-terminated which is evident by its
> use with string apis later on like `strspn`:
> | p = aoe_iflist + strspn(aoe_iflist, WHITESPACE);
>
> It also seems `aoe_iflist` does not need to be NUL-padded which means
> `strscpy` [2] is a suitable replacement due to the fact that it
> guarantees NUL-termination on the destination buffer while not
> unnecessarily NUL-padding.
>
> Link: https://www.kernel.org/doc/html/latest/process/deprecated.html#strncpy-on-nul-terminated-strings [1]
> Link: https://manpages.debian.org/testing/linux-manual-4.8/strscpy.9.en.html [2]
> Link: https://github.com/KSPP/linux/issues/90
> Cc: linux-hardening@...r.kernel.org
> Cc: Kees Cook <keescook@...omium.org>
> Cc: Xu Panda <xu.panda@....com.cn>
> Cc: Yang Yang <yang.yang29@....com>
> Signed-off-by: Justin Stitt <justinstitt@...gle.com>
Looks right. Thanks!
Reviewed-by: Kees Cook <keescook@...omium.org>
--
Kees Cook
Powered by blists - more mailing lists