linux-ppp.vger.kernel.org archive mirror
 help / color / mirror / Atom feed
From: Kees Cook <keescook@chromium.org>
To: Paul Mackerras <paulus@samba.org>
Cc: Arnd Bergmann <arnd@arndb.de>,
	"David S. Miller" <davem@davemloft.net>,
	Herbert Xu <herbert@gondor.apana.org.au>,
	Eric Biggers <ebiggers@google.com>,
	"Gustavo A. R. Silva" <gustavo@embeddedor.com>,
	linux-ppp@vger.kernel.org, Networking <netdev@vger.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH] ppp: mppe: Remove VLA usage
Date: Thu, 02 Aug 2018 23:27:01 +0000	[thread overview]
Message-ID: <CAGXu5jKaNk8x9v+uVQ_O7gxr50s1-Q901JbQupnkBFYiUjd7UQ@mail.gmail.com> (raw)
In-Reply-To: <CAK8P3a1tph9VPJnYYhBvH_1wZ79wXDvfnJt_CEruj3T-TBG1jg@mail.gmail.com>

On Mon, Jul 16, 2018 at 4:01 AM, Arnd Bergmann <arnd@arndb.de> wrote:
> On Mon, Jul 16, 2018 at 6:05 AM, Kees Cook <keescook@chromium.org> wrote:
>> In the quest to remove all stack VLA usage from the kernel[1], this
>> removes the discouraged use of AHASH_REQUEST_ON_STACK (and associated
>> VLA) by switching to shash directly and keeping the associated descriptor
>> allocated with the regular state on the heap.
>>
>> [1] https://lkml.kernel.org/r/CA+55aFzCG-zNmZwX4A2FQpadafLfEzK6CC=qPXydAacU1RqZWA@mail.gmail.com
>>
>> Signed-off-by: Kees Cook <keescook@chromium.org>
>
> I had concerns at first that this approach might make it slower, but
> upon reading through implementation of the shash_ahash_ implementation,
> I concluded that it can only be better than before, improving both
> performance and stack usage.
>
> Acked-by: Arnd Bergmann <arnd@arndb.de>

Paul,

Is this something you can take via your tree?

Thanks,

-Kees


-- 
Kees Cook
Pixel Security

  reply	other threads:[~2018-08-02 23:27 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-07-16  4:05 Kees Cook
2018-07-16 11:01 ` Arnd Bergmann
2018-08-02 23:27   ` Kees Cook [this message]
2018-08-03  3:13     ` Paul Mackerras
2018-07-16 17:36 ` Eric Biggers

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=CAGXu5jKaNk8x9v+uVQ_O7gxr50s1-Q901JbQupnkBFYiUjd7UQ@mail.gmail.com \
    --to=keescook@chromium.org \
    --cc=arnd@arndb.de \
    --cc=davem@davemloft.net \
    --cc=ebiggers@google.com \
    --cc=gustavo@embeddedor.com \
    --cc=herbert@gondor.apana.org.au \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux-ppp@vger.kernel.org \
    --cc=netdev@vger.kernel.org \
    --cc=paulus@samba.org \
    --subject='Re: [PATCH] ppp: mppe: Remove VLA usage' \
    /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

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).