From: Jens Axboe <axboe@kernel.dk>
To: Kees Cook <keescook@chromium.org>, Justin Stitt <justinstitt@google.com>
Cc: Justin Sanders <justin@coraid.com>,
linux-block@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-hardening@vger.kernel.org, Xu Panda <xu.panda@zte.com.cn>,
Yang Yang <yang.yang29@zte.com>
Subject: Re: [PATCH] aoe: refactor deprecated strncpy
Date: Fri, 15 Sep 2023 07:36:40 -0600 [thread overview]
Message-ID: <6338fbac-0177-43eb-be4f-7c586956953f@kernel.dk> (raw)
In-Reply-To: <202309142019.23A7D80A@keescook>
On 9/14/23 9:21 PM, Kees Cook wrote:
> On Mon, Sep 11, 2023 at 09:09:07PM +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@vger.kernel.org
>> Cc: Kees Cook <keescook@chromium.org>
>> Cc: Xu Panda <xu.panda@zte.com.cn>
>> Cc: Yang Yang <yang.yang29@zte.com>
>> Signed-off-by: Justin Stitt <justinstitt@google.com>
>
> Agreed, truncation is the current behavior, and padding isn't needed.
> (Or more precisely, it's already zeroed and this function is called
> once.)
>
> Reviewed-by: Kees Cook <keescook@chromium.org>
Change looks fine to me too, but for the love of $deity, please use
a proper subject line for these kinds of patches. It's not refactoring
anything.
--
Jens Axboe
next prev parent reply other threads:[~2023-09-15 13:36 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-09-11 21:09 [PATCH] aoe: refactor deprecated strncpy Justin Stitt
2023-09-15 3:21 ` Kees Cook
2023-09-15 13:36 ` Jens Axboe [this message]
2023-09-18 7:03 ` Justin Stitt
2023-09-18 14:00 ` Jens Axboe
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=6338fbac-0177-43eb-be4f-7c586956953f@kernel.dk \
--to=axboe@kernel.dk \
--cc=justin@coraid.com \
--cc=justinstitt@google.com \
--cc=keescook@chromium.org \
--cc=linux-block@vger.kernel.org \
--cc=linux-hardening@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=xu.panda@zte.com.cn \
--cc=yang.yang29@zte.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox