]> err.no Git - linux-2.6/commit
sysctl: allow override of /proc/sys/net with CAP_NET_ADMIN
authorStephen Hemminger <shemminger@vyatta.com>
Fri, 25 Jul 2008 08:48:32 +0000 (01:48 -0700)
committerLinus Torvalds <torvalds@linux-foundation.org>
Fri, 25 Jul 2008 17:53:45 +0000 (10:53 -0700)
commit4ecb90090c84210a8bd2a9d7a5906e616735873c
treea7baec8859ff9750296be318400ba4475eb40b6c
parent99541c23cd32bacf1a591ca537a7c0cb9053ad7e
sysctl: allow override of /proc/sys/net with CAP_NET_ADMIN

Extend the permission check for networking sysctl's to allow modification
when current process has CAP_NET_ADMIN capability and is not root.  This
version uses the until now unused permissions hook to override the mode
value for /proc/sys/net if accessed by a user with capabilities.

Found while working with Quagga.  It is impossible to turn forwarding
on/off through the command interface because Quagga uses secure coding
practice of dropping privledges during initialization and only raising via
capabilities when necessary.  Since the dameon has reset real/effective
uid after initialization, all attempts to access /proc/sys/net variables
will fail.

Signed-off-by: Stephen Hemminger <shemminger@vyatta.com>
Acked-by: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Chris Wright <chrisw@sous-sol.org>
Cc: Alexey Dobriyan <adobriyan@gmail.com>
Cc: Andrew Morgan <morgan@kernel.org>
Cc: Pavel Emelyanov <xemul@openvz.org>
Cc: "David S. Miller" <davem@davemloft.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
net/sysctl_net.c