path: root/security/smack/smack_access.c
diff options
authorRoman Kubiak <r.kubiak@samsung.com>2015-08-10 16:54:25 +0200
committerCasey Schaufler <casey@schaufler-ca.com>2015-08-10 15:15:50 -0700
commit41a2d5751616e38d1e293e3cb35a6e2bc7a03473 (patch)
tree110e07d1d5baab0d2614bb62a2c4d1d24389a4f1 /security/smack/smack_access.c
parent1eddfe8edb8f85a0d7f793090abcbdf8741455de (diff)
Kernel threads excluded from smack checks
Adds an ignore case for kernel tasks, so that they can access all resources. Since kernel worker threads are spawned with floor label, they are severely restricted by Smack policy. It is not an issue without onlycap, as these processes also run with root, so CAP_MAC_OVERRIDE kicks in. But with onlycap turned on, there is no way to change the label for these processes. Signed-off-by: Roman Kubiak <r.kubiak@samsung.com> Acked-by: Casey Schaufler <casey@schaufler-ca.com>
Diffstat (limited to 'security/smack/smack_access.c')
1 files changed, 6 insertions, 0 deletions
diff --git a/security/smack/smack_access.c b/security/smack/smack_access.c
index 00f6b38bffbd..bc1053fb5d1d 100644
--- a/security/smack/smack_access.c
+++ b/security/smack/smack_access.c
@@ -639,6 +639,12 @@ int smack_privileged(int cap)
struct smack_known *skp = smk_of_current();
struct smack_onlycap *sop;
+ /*
+ * All kernel tasks are privileged
+ */
+ if (unlikely(current->flags & PF_KTHREAD))
+ return 1;
if (!capable(cap))
return 0;