From 41a2d5751616e38d1e293e3cb35a6e2bc7a03473 Mon Sep 17 00:00:00 2001 From: Roman Kubiak Date: Mon, 10 Aug 2015 16:54:25 +0200 Subject: [PATCH] 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 Acked-by: Casey Schaufler --- security/smack/smack_access.c | 6 ++++++ 1 file changed, 6 insertions(+) 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;