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authorLinus Torvalds <torvalds@linux-foundation.org>2016-01-17 19:13:15 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2016-01-17 19:13:15 -0800
commit5807fcaa9bf7dd87241df739161c119cf78a6bc4 (patch)
tree4ed1e647a0ae0f315db3b9066c9235020c439649 /security/keys/keyctl.c
parent2d663b55816e5c1d211a77fff90687053fe78aac (diff)
parentacb2cfdb316ddc3fac8183c0f71edd1680713b10 (diff)
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 ...
Diffstat (limited to 'security/keys/keyctl.c')
-rw-r--r--security/keys/keyctl.c49
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;
}