Messages in this thread Patch in this message | | | Date | Thu, 15 Jan 2009 11:58:09 -0800 | From | Greg KH <> | Subject | [patch 25/94] devices cgroup: allow mkfifo |
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2.6.28-stable review patch. If anyone has any objections, please let us know.
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From: Serge E. Hallyn <serue@us.ibm.com>
commit 0b82ac37b889ec881b645860da3775118effb3ca upstream.
The devcgroup_inode_permission() hook in the devices whitelist cgroup has always bypassed access checks on fifos. But the mknod hook did not. The devices whitelist is only about block and char devices, and fifos can't even be added to the whitelist, so fifos can't be created at all except by tasks which have 'a' in their whitelist (meaning they have access to all devices).
Fix the behavior by bypassing access checks to mkfifo.
Signed-off-by: Serge E. Hallyn <serue@us.ibm.com> Cc: Li Zefan <lizf@cn.fujitsu.com> Cc: Pavel Emelyanov <xemul@openvz.org> Cc: Paul Menage <menage@google.com> Cc: Lai Jiangshan <laijs@cn.fujitsu.com> Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Cc: James Morris <jmorris@namei.org> Reported-by: Daniel Lezcano <dlezcano@fr.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
--- security/device_cgroup.c | 3 +++ 1 file changed, 3 insertions(+)
--- a/security/device_cgroup.c +++ b/security/device_cgroup.c @@ -513,6 +513,9 @@ int devcgroup_inode_mknod(int mode, dev_ struct dev_cgroup *dev_cgroup; struct dev_whitelist_item *wh; + if (!S_ISBLK(mode) && !S_ISCHR(mode)) + return 0; + rcu_read_lock(); dev_cgroup = task_devcgroup(current);
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