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Date: Wed, 26 Oct 2011 13:43:16 -0400
From: Dan Rosenberg <dan.j.rosenberg@...il.com>
To: oss-security@...ts.openwall.com
Subject: Re: CVE Request -- kernel: sysctl: restrict write
access to dmesg_restrict
On Wed, Oct 26, 2011 at 11:16 AM, Petr Matousek <pmatouse@...hat.com> wrote:
> When dmesg_restrict is set to 1 CAP_SYS_ADMIN is needed to read the
> kernel ring buffer. But a root user without CAP_SYS_ADMIN is able
> to reset dmesg_restrict to 0.
>
Minor correction: CAP_SYSLOG is needed to read the kernel ring buffer,
with CAP_SYS_ADMIN being a fallback for legacy reasons. But it's
correct that CAP_SYS_ADMIN is now required to modify the sysctl.
I also agree with Vasiliy's point that LXC security boundaries in the
mainline kernel are not well defined at this point, so the whole thing
is a bit silly.
-Dan
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