Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/linux-security

Pull security subsystem updates from James Morris:

 - EVM gains support for loading an x509 cert from the kernel
   (EVM_LOAD_X509), into the EVM trusted kernel keyring.

 - Smack implements 'file receive' process-based permission checking for
   sockets, rather than just depending on inode checks.

 - Misc enhancments for TPM & TPM2.

 - Cleanups and bugfixes for SELinux, Keys, and IMA.

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/linux-security: (41 commits)
  selinux: Inode label revalidation performance fix
  KEYS: refcount bug fix
  ima: ima_write_policy() limit locking
  IMA: policy can be updated zero times
  selinux: rate-limit netlink message warnings in selinux_nlmsg_perm()
  selinux: export validatetrans decisions
  gfs2: Invalid security labels of inodes when they go invalid
  selinux: Revalidate invalid inode security labels
  security: Add hook to invalidate inode security labels
  selinux: Add accessor functions for inode->i_security
  security: Make inode argument of inode_getsecid non-const
  security: Make inode argument of inode_getsecurity non-const
  selinux: Remove unused variable in selinux_inode_init_security
  keys, trusted: seal with a TPM2 authorization policy
  keys, trusted: select hash algorithm for TPM2 chips
  keys, trusted: fix: *do not* allow duplicate key options
  tpm_ibmvtpm: properly handle interrupted packet receptions
  tpm_tis: Tighten IRQ auto-probing
  tpm_tis: Refactor the interrupt setup
  tpm_tis: Get rid of the duplicate IRQ probing code
  ...

1 files changed, 41 insertions, 8 deletions

diff --git a/security/keys/keyctl.c b/security/keys/keyctl.c
index 1c3872aeed14..ed73c6c1c326 100644
--- a/security/keys/keyctl.c
+++ b/security/keys/keyctl.c
@@ -358,11 +358,14 @@ error:
  * and any links to the key will be automatically garbage collected after a
  * certain amount of time (/proc/sys/kernel/keys/gc_delay).
  *
+ * Keys with KEY_FLAG_KEEP set should not be revoked.
+ *
  * If successful, 0 is returned.
  */
 long keyctl_revoke_key(key_serial_t id)
 {
 	key_ref_t key_ref;
+	struct key *key;
 	long ret;
 
 	key_ref = lookup_user_key(id, 0, KEY_NEED_WRITE);
@@ -377,8 +380,12 @@ long keyctl_revoke_key(key_serial_t id)
 		}
 	}
 
-	key_revoke(key_ref_to_ptr(key_ref));
+	key = key_ref_to_ptr(key_ref);
 	ret = 0;
+	if (test_bit(KEY_FLAG_KEEP, &key->flags))
+		ret = -EPERM;
+	else
+		key_revoke(key);
 
 	key_ref_put(key_ref);
 error:
@@ -392,11 +399,14 @@ error:
  * The key and any links to the key will be automatically garbage collected
  * immediately.
  *
+ * Keys with KEY_FLAG_KEEP set should not be invalidated.
+ *
  * If successful, 0 is returned.
  */
 long keyctl_invalidate_key(key_serial_t id)
 {
 	key_ref_t key_ref;
+	struct key *key;
 	long ret;
 
 	kenter("%d", id);
@@ -420,8 +430,12 @@ long keyctl_invalidate_key(key_serial_t id)
 	}
 
 invalidate:
-	key_invalidate(key_ref_to_ptr(key_ref));
+	key = key_ref_to_ptr(key_ref);
 	ret = 0;
+	if (test_bit(KEY_FLAG_KEEP, &key->flags))
+		ret = -EPERM;
+	else
+		key_invalidate(key);
 error_put:
 	key_ref_put(key_ref);
 error:
@@ -433,12 +447,13 @@ error:
  * Clear the specified keyring, creating an empty process keyring if one of the
  * special keyring IDs is used.
  *
- * The keyring must grant the caller Write permission for this to work.  If
- * successful, 0 will be returned.
+ * The keyring must grant the caller Write permission and not have
+ * KEY_FLAG_KEEP set for this to work.  If successful, 0 will be returned.
  */
 long keyctl_keyring_clear(key_serial_t ringid)
 {
 	key_ref_t keyring_ref;
+	struct key *keyring;
 	long ret;
 
 	keyring_ref = lookup_user_key(ringid, KEY_LOOKUP_CREATE, KEY_NEED_WRITE);
@@ -460,7 +475,11 @@ long keyctl_keyring_clear(key_serial_t ringid)
 	}
 
 clear:
-	ret = keyring_clear(key_ref_to_ptr(keyring_ref));
+	keyring = key_ref_to_ptr(keyring_ref);
+	if (test_bit(KEY_FLAG_KEEP, &keyring->flags))
+		ret = -EPERM;
+	else
+		ret = keyring_clear(keyring);
 error_put:
 	key_ref_put(keyring_ref);
 error:
@@ -511,11 +530,14 @@ error:
  * itself need not grant the caller anything.  If the last link to a key is
  * removed then that key will be scheduled for destruction.
  *
+ * Keys or keyrings with KEY_FLAG_KEEP set should not be unlinked.
+ *
  * If successful, 0 will be returned.
  */
 long keyctl_keyring_unlink(key_serial_t id, key_serial_t ringid)
 {
 	key_ref_t keyring_ref, key_ref;
+	struct key *keyring, *key;
 	long ret;
 
 	keyring_ref = lookup_user_key(ringid, 0, KEY_NEED_WRITE);
@@ -530,7 +552,13 @@ long keyctl_keyring_unlink(key_serial_t id, key_serial_t ringid)
 		goto error2;
 	}
 
-	ret = key_unlink(key_ref_to_ptr(keyring_ref), key_ref_to_ptr(key_ref));
+	keyring = key_ref_to_ptr(keyring_ref);
+	key = key_ref_to_ptr(key_ref);
+	if (test_bit(KEY_FLAG_KEEP, &keyring->flags) &&
+	    test_bit(KEY_FLAG_KEEP, &key->flags))
+		ret = -EPERM;
+	else
+		ret = key_unlink(keyring, key);
 
 	key_ref_put(key_ref);
 error2:
@@ -1289,6 +1317,8 @@ error:
  * the current time.  The key and any links to the key will be automatically
  * garbage collected after the timeout expires.
  *
+ * Keys with KEY_FLAG_KEEP set should not be timed out.
+ *
  * If successful, 0 is returned.
  */
 long keyctl_set_timeout(key_serial_t id, unsigned timeout)
@@ -1320,10 +1350,13 @@ long keyctl_set_timeout(key_serial_t id, unsigned timeout)
 
 okay:
 	key = key_ref_to_ptr(key_ref);
-	key_set_timeout(key, timeout);
+	ret = 0;
+	if (test_bit(KEY_FLAG_KEEP, &key->flags))
+		ret = -EPERM;
+	else
+		key_set_timeout(key, timeout);
 	key_put(key);
 
-	ret = 0;
 error:
 	return ret;
 }