From: Kees Cook <keescook@chromium.org>
To: Florian Fainelli <ffainelli@freebox.fr>
Cc: cbouatmailru@gmail.com, ccross@android.com, tony.luck@intel.com,
linux-kernel@vger.kernel.org, Maxime Bizon <mbizon@freebox.fr>,
stable@vger.kernel.org
Subject: Re: [PATCH v2] pstore/ram: fix undefined usage of rounddown_pow_of_two(0)
Date: Mon, 22 Oct 2012 08:17:27 -0700 [thread overview]
Message-ID: <CAGXu5jJhsQ+yGgNRd-sitsusGsuyTjc_Q3DcoSDg4Q=MnJ4agw@mail.gmail.com> (raw)
In-Reply-To: <1350897568-14262-1-git-send-email-ffainelli@freebox.fr>
On Mon, Oct 22, 2012 at 2:19 AM, Florian Fainelli <ffainelli@freebox.fr> wrote:
> From: Maxime Bizon <mbizon@freebox.fr>
>
> record_size / console_size / ftrace_size can be 0 (this is how you
> disable the feature), but rounddown_pow_of_two(0) is undefined. As suggested
> by Kees Cook, use !is_power_of_2() as a condition to call rounddown_pow_of_two
> and avoid its undefined behavior on the value 0. This issue has been present
> since commit 1894a253 (ramoops: Move to fs/pstore/ram.c).
>
> CC: stable@vger.kernel.org
> Signed-off-by: Maxime Bizon <mbizon@freebox.fr>
> Signed-off-by: Florian Fainelli <ffainelli@freebox.fr>
Thanks for the fix!
Acked-by: Kees Cook <keescook@chromium.org>
-Kees
--
Kees Cook
Chrome OS Security
next prev parent reply other threads:[~2012-10-22 15:17 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-10-19 11:59 [PATCH] pstore/ram: fix undefined usage of rounddown_pow_of_two Florian Fainelli
2012-10-19 16:03 ` Kees Cook
2012-10-22 8:37 ` Florian Fainelli
2012-10-22 9:19 ` [PATCH v2] pstore/ram: fix undefined usage of rounddown_pow_of_two(0) Florian Fainelli
2012-10-22 15:17 ` Kees Cook [this message]
2012-11-18 1:42 ` Anton Vorontsov
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