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Message-ID: <4F4819E3.23795.217CF269@pageexec.freemail.hu>
Date: Sat, 25 Feb 2012 00:14:43 +0200
From: "PaX Team" <pageexec@...email.hu>
To: Greg KH <gregkh@...uxfoundation.org>, David Windsor <dwindsor@...il.com>
CC: Roland Dreier <roland@...estorage.com>, Djalal Harouni <tixxdz@...ndz.org>,
Vasiliy Kulikov <segoon@...nwall.com>,
kernel-hardening@...ts.openwall.com, Kees Cook <keescook@...omium.org>,
Ubuntu security discussion <ubuntu-hardened@...ts.ubuntu.com>,
linux-kernel@...r.kernel.org, spender@...ecurity.net
Subject: Re: Re: Add overflow protection to kref
On 24 Feb 2012 at 14:04, David Windsor wrote:
> Suggestions on recovering from an overflow here?
do what PaX does? :)
1. saturate the refcount
2. report the event (pax_report_refcount_overflow)
3. kill the triggering userland process (this may be optional but it's a good measure
if you have stuff like grsecurity's lockout feature)
> 2. Detect the overflow before it happens, don't increment the counter,
> issue a warning but no BUG.
> This could also lead to some "undefined" behavior in subsystems.
it's called a memory leak :).
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