aboutsummaryrefslogtreecommitdiff
path: root/security/smack/smack_access.c
diff options
context:
space:
mode:
authorCasey Schaufler <casey@schaufler-ca.com>2014-10-09 16:18:55 -0700
committerCasey Schaufler <casey@schaufler-ca.com>2014-10-28 08:22:40 -0700
commit6c892df2686c5611979792aaa4ddea9ee9f18749 (patch)
tree58f14443be31f7e5249419d46b9bf6dc740fb970 /security/smack/smack_access.c
parent594081ee7145cc30a3977cb4e218f81213b63dc5 (diff)
downloadlinux-6c892df2686c5611979792aaa4ddea9ee9f18749.tar.gz
Smack: Lock mode for the floor and hat labels
The lock access mode allows setting a read lock on a file for with the process has only read access. The floor label is defined to make it easy to have the basic system installed such that everyone can read it. Once there's a desire to read lock (rationally or otherwise) a floor file a rule needs to get set. This happens all the time, so make the floor label a little bit more special and allow everyone lock access, too. By implication, give processes with the hat label (hat can read everything) lock access as well. This reduces clutter in the Smack rule set. Signed-off-by: Casey Schaufler <casey@schaufler-ca.com>
Diffstat (limited to 'security/smack/smack_access.c')
-rw-r--r--security/smack/smack_access.c10
1 files changed, 5 insertions, 5 deletions
diff --git a/security/smack/smack_access.c b/security/smack/smack_access.c
index 5b970ffde024..999224fe8593 100644
--- a/security/smack/smack_access.c
+++ b/security/smack/smack_access.c
@@ -142,8 +142,7 @@ int smk_access(struct smack_known *subject, struct smack_known *object,
* Tasks cannot be assigned the internet label.
* An internet subject can access any object.
*/
- if (object == &smack_known_web ||
- subject == &smack_known_web)
+ if (object == &smack_known_web || subject == &smack_known_web)
goto out_audit;
/*
* A star object can be accessed by any subject.
@@ -157,10 +156,11 @@ int smk_access(struct smack_known *subject, struct smack_known *object,
if (subject->smk_known == object->smk_known)
goto out_audit;
/*
- * A hat subject can read any object.
- * A floor object can be read by any subject.
+ * A hat subject can read or lock any object.
+ * A floor object can be read or locked by any subject.
*/
- if ((request & MAY_ANYREAD) == request) {
+ if ((request & MAY_ANYREAD) == request ||
+ (request & MAY_LOCK) == request) {
if (object == &smack_known_floor)
goto out_audit;
if (subject == &smack_known_hat)