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authorCasey Schaufler <casey@schaufler-ca.com>2013-10-11 18:06:39 -0700
committerCasey Schaufler <casey@schaufler-ca.com>2013-10-18 09:39:33 -0700
commitc0ab6e56dcb7ca9903d460247cb464e769ae6e77 (patch)
tree52da39cb2798c0a4276d0d23fa3b4f1dbcd732f2 /security/smack/smack.h
parent5a5f2acfd04269e2e0958067216b68ff461c285c (diff)
downloadlinux-c0ab6e56dcb7ca9903d460247cb464e769ae6e77.tar.gz
Smack: Implement lock security mode
Linux file locking does not follow the same rules as other mechanisms. Even though it is a write operation a process can set a read lock on files which it has open only for read access. Two programs with read access to a file can use read locks to communicate. This is not acceptable in a Mandatory Access Control environment. Smack treats setting a read lock as the write operation that it is. Unfortunately, many programs assume that setting a read lock is a read operation. These programs are unhappy in the Smack environment. This patch introduces a new access mode (lock) to address this problem. A process with lock access to a file can set a read lock. A process with write access to a file can set a read lock or a write lock. This prevents a situation where processes are granted write access just so they can set read locks. Targeted for git://git.gitorious.org/smack-next/kernel.git Signed-off-by: Casey Schaufler <casey@schaufler-ca.com>
Diffstat (limited to 'security/smack/smack.h')
-rw-r--r--security/smack/smack.h12
1 files changed, 8 insertions, 4 deletions
diff --git a/security/smack/smack.h b/security/smack/smack.h
index 076b8e8a51a..364cc64fce7 100644
--- a/security/smack/smack.h
+++ b/security/smack/smack.h
@@ -177,9 +177,13 @@ struct smk_port_label {
#define SMACK_CIPSO_MAXCATNUM 184 /* 23 * 8 */
/*
- * Flag for transmute access
+ * Flags for untraditional access modes.
+ * It shouldn't be necessary to avoid conflicts with definitions
+ * in fs.h, but do so anyway.
*/
-#define MAY_TRANSMUTE 64
+#define MAY_TRANSMUTE 0x00001000 /* Controls directory labeling */
+#define MAY_LOCK 0x00002000 /* Locks should be writes, but ... */
+
/*
* Just to make the common cases easier to deal with
*/
@@ -188,9 +192,9 @@ struct smk_port_label {
#define MAY_NOT 0
/*
- * Number of access types used by Smack (rwxat)
+ * Number of access types used by Smack (rwxatl)
*/
-#define SMK_NUM_ACCESS_TYPE 5
+#define SMK_NUM_ACCESS_TYPE 6
/* SMACK data */
struct smack_audit_data {