From: Jason Gunthorpe <jgg@ziepe.ca>
To: Kees Cook <keescook@chromium.org>
Cc: Rasmus Villemoes <linux@rasmusvillemoes.dk>,
Leon Romanovsky <leonro@mellanox.com>,
Leon Romanovsky <leon@kernel.org>,
Bart Van Assche <Bart.VanAssche@wdc.com>,
Doug Ledford <dledford@redhat.com>,
Dan Carpenter <dan.carpenter@oracle.com>,
linux-rdma@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH v2 1/3] overflow.h: Add arithmetic shift helper
Date: Tue, 31 Jul 2018 20:15:08 -0600 [thread overview]
Message-ID: <20180801021508.GB31192@ziepe.ca> (raw)
In-Reply-To: <20180801000039.44314-2-keescook@chromium.org>
On Tue, Jul 31, 2018 at 05:00:37PM -0700, Kees Cook wrote:
> From: Jason Gunthorpe <jgg@mellanox.com>
>
> Add shift_overflow() helper to assist driver authors in ensuring that
> shift operations don't cause overflows or other odd conditions.
>
> Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
> Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
> [kees: tweaked comments and commit log, dropped unneeded assignment]
> Signed-off-by: Kees Cook <keescook@chromium.org>
> ---
> include/linux/overflow.h | 31 +++++++++++++++++++++++++++++++
> 1 file changed, 31 insertions(+)
>
> diff --git a/include/linux/overflow.h b/include/linux/overflow.h
> index 8712ff70995f..69fc366ce865 100644
> --- a/include/linux/overflow.h
> +++ b/include/linux/overflow.h
> @@ -202,6 +202,37 @@
>
> #endif /* COMPILER_HAS_GENERIC_BUILTIN_OVERFLOW */
>
> +/** check_shift_overflow() - Calculate a left-shifted value and check overflow
> + *
> + * @a: Value to be shifted
> + * @b: How many bits left to shift
The above @b should be @s
> +#define check_shift_overflow(a, s, d) ({ \
Should I run this series through the rdma tree?
Thanks,
Jason
next prev parent reply other threads:[~2018-08-01 2:15 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-08-01 0:00 [PATCH v2 0/3] overflow.h: Add arithmetic shift helper Kees Cook
2018-08-01 0:00 ` [PATCH v2 1/3] " Kees Cook
2018-08-01 1:59 ` Randy Dunlap
2018-08-01 2:15 ` Jason Gunthorpe [this message]
2018-08-01 4:22 ` Kees Cook
2018-08-01 7:57 ` Dan Carpenter
2018-08-01 8:07 ` Dan Carpenter
2018-08-01 15:38 ` Kees Cook
2018-08-01 15:48 ` Jason Gunthorpe
2018-08-01 0:00 ` [PATCH v2 2/3] test_overflow: Add shift overflow tests Kees Cook
2018-08-01 2:13 ` Jason Gunthorpe
2018-08-01 5:51 ` Kees Cook
2018-08-01 0:00 ` [PATCH v2 3/3] RDMA/mlx5: Fix shift overflow in mlx5_ib_create_wq Kees Cook
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=20180801021508.GB31192@ziepe.ca \
--to=jgg@ziepe.ca \
--cc=Bart.VanAssche@wdc.com \
--cc=dan.carpenter@oracle.com \
--cc=dledford@redhat.com \
--cc=keescook@chromium.org \
--cc=leon@kernel.org \
--cc=leonro@mellanox.com \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-rdma@vger.kernel.org \
--cc=linux@rasmusvillemoes.dk \
/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