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Message-ID: <216419277.305681263411925052.JavaMail.root@zmail01.collab.prod.int.phx2.redhat.com>
Date: Wed, 13 Jan 2010 14:45:25 -0500 (EST)
From: Josh Bressers <bressers@...hat.com>
To: oss-security@...ts.openwall.com
Cc: "Steven M. Christey" <coley@...us.mitre.org>
Subject: Re: CVE request - kernel: infoleak if
print-fatal-signals=1
Please use CVE-2010-0003 for this.
Thanks.
--
JB
----- "Eugene Teo" <eugene@...hat.com> wrote:
> Description from the upstream patch:
> When print-fatal-signals is enabled it's possible to dump any memory
> reachable by the kernel to the log by simply jumping to that address
> from user space.
>
> Or crash the system if there's some hardware with read side effects.
>
> The fatal signals handler will dump 16 bytes at the execution address,
>
> which is fully controlled by ring 3.
>
> In addition when something jumps to an unmapped address there will be
> up
> to 16 additional useless page faults, which might be potentially slow
>
> (and at least is not very efficient)
>
> Fortunately this option is off by default and only there on i386.
>
> But fix it by hecking for kernel addresses and also stopping when
> there's a page fault.
>
> References:
> http://patchwork.kernel.org/patch/69752/
> http://git.kernel.org/linus/b45c6e76bc2c72f6426c14bed64fdcbc9bf37cb0
> https://bugzilla.redhat.com/show_bug.cgi?id=554578
>
> Thanks, Eugene
> --
> Eugene Teo / Red Hat Security Response Team
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