lkml.org 
[lkml]   [2011]   [Mar]   [15]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
SubjectRe: [PATCH] Restrict write access to dmesg_restrict
Date
On Mon, 14 Mar 2011 20:35:56 +0100, Richard Weinberger 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.
>
> This is an issue when e.g. LXC (Linux Containers) are used and complete
> user space is running without CAP_SYS_ADMIN. A unprivileged and jailed
> root user can bypass the dmesg_restrict protection.
>
> With this patch writing to dmesg_restrict is only allowed when root has
> CAP_SYS_ADMIN.
>
> Signed-off-by: Richard Weinberger <richard@nod.at>

Makes sense.

Reviewed-by: WANG Cong <xiyou.wangcong@gmail.com>

Thanks.



\
 
 \ /
  Last update: 2011-03-15 14:49    [from the cache]
©2003-2014 Jasper Spaans. Advertise on this site