2.6.27-stable review patch. If anyone has any objections, please let us know. ------------------ From: Serge E. Hallyn 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 Cc: Li Zefan Cc: Pavel Emelyanov Cc: Paul Menage Cc: Lai Jiangshan Cc: KOSAKI Motohiro Cc: James Morris Reported-by: Daniel Lezcano Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds Signed-off-by: Greg Kroah-Hartman --- security/device_cgroup.c | 3 +++ 1 file changed, 3 insertions(+) --- a/security/device_cgroup.c +++ b/security/device_cgroup.c @@ -543,6 +543,9 @@ 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); -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/