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authorSerge E. Hallyn <serue@us.ibm.com>2009-01-07 21:07:46 -0500
committerLinus Torvalds <torvalds@linux-foundation.org>2009-01-08 11:31:03 -0500
commit0b82ac37b889ec881b645860da3775118effb3ca (patch)
tree93407311725ac2588df5f37e261304a51064e200 /security/device_cgroup.c
parent116e05751285c20edf5768ca3bcc00dad86181bb (diff)
devices cgroup: allow mkfifo
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> Cc: <stable@kernel.org> [2.6.27.x] Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'security/device_cgroup.c')
-rw-r--r--security/device_cgroup.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/security/device_cgroup.c b/security/device_cgroup.c
index cd377b9082b5..3aacd0fe7179 100644
--- a/security/device_cgroup.c
+++ b/security/device_cgroup.c
@@ -513,6 +513,9 @@ int devcgroup_inode_mknod(int mode, dev_t dev)
513 struct dev_cgroup *dev_cgroup; 513 struct dev_cgroup *dev_cgroup;
514 struct dev_whitelist_item *wh; 514 struct dev_whitelist_item *wh;
515 515
516 if (!S_ISBLK(mode) && !S_ISCHR(mode))
517 return 0;
518
516 rcu_read_lock(); 519 rcu_read_lock();
517 520
518 dev_cgroup = task_devcgroup(current); 521 dev_cgroup = task_devcgroup(current);