CRED: Wrap task credential accesses in the key management code
David Howells [Thu, 13 Nov 2008 23:39:11 +0000 (10:39 +1100)]
Wrap access to task credentials so that they can be separated more easily from
the task_struct during the introduction of COW creds.

Change most current->(|e|s|fs)[ug]id to current_(|e|s|fs)[ug]id().

Change some task->e?[ug]id to task_e?[ug]id().  In some places it makes more
sense to use RCU directly rather than a convenient wrapper; these will be
addressed by later patches.

Signed-off-by: David Howells <dhowells@redhat.com>
Reviewed-by: James Morris <jmorris@namei.org>
Acked-by: Serge Hallyn <serue@us.ibm.com>
Signed-off-by: James Morris <jmorris@namei.org>

security/keys/key.c
security/keys/keyctl.c
security/keys/request_key.c
security/keys/request_key_auth.c

index 14948cf..a6ca39e 100644 (file)
@@ -802,7 +802,7 @@ key_ref_t key_create_or_update(key_ref_t keyring_ref,
        }
 
        /* allocate a new key */
-       key = key_alloc(ktype, description, current->fsuid, current->fsgid,
+       key = key_alloc(ktype, description, current_fsuid(), current_fsgid(),
                        current, perm, flags);
        if (IS_ERR(key)) {
                key_ref = ERR_CAST(key);
index acc9c89..3f09e5b 100644 (file)
@@ -817,7 +817,7 @@ long keyctl_setperm_key(key_serial_t id, key_perm_t perm)
        down_write(&key->sem);
 
        /* if we're not the sysadmin, we can only change a key that we own */
-       if (capable(CAP_SYS_ADMIN) || key->uid == current->fsuid) {
+       if (capable(CAP_SYS_ADMIN) || key->uid == current_fsuid()) {
                key->perm = perm;
                ret = 0;
        }
index ba32ca6..a8ebc95 100644 (file)
@@ -77,7 +77,7 @@ static int call_sbin_request_key(struct key_construction *cons,
        /* allocate a new session keyring */
        sprintf(desc, "_req.%u", key->serial);
 
-       keyring = keyring_alloc(desc, current->fsuid, current->fsgid, current,
+       keyring = keyring_alloc(desc, current_fsuid(), current_fsgid(), current,
                                KEY_ALLOC_QUOTA_OVERRUN, NULL);
        if (IS_ERR(keyring)) {
                ret = PTR_ERR(keyring);
@@ -90,8 +90,8 @@ static int call_sbin_request_key(struct key_construction *cons,
                goto error_link;
 
        /* record the UID and GID */
-       sprintf(uid_str, "%d", current->fsuid);
-       sprintf(gid_str, "%d", current->fsgid);
+       sprintf(uid_str, "%d", current_fsuid());
+       sprintf(gid_str, "%d", current_fsgid());
 
        /* we say which key is under construction */
        sprintf(key_str, "%d", key->serial);
@@ -279,7 +279,7 @@ static int construct_alloc_key(struct key_type *type,
        mutex_lock(&user->cons_lock);
 
        key = key_alloc(type, description,
-                       current->fsuid, current->fsgid, current, KEY_POS_ALL,
+                       current_fsuid(), current_fsgid(), current, KEY_POS_ALL,
                        flags);
        if (IS_ERR(key))
                goto alloc_failed;
@@ -342,7 +342,7 @@ static struct key *construct_key_and_link(struct key_type *type,
        struct key *key;
        int ret;
 
-       user = key_user_lookup(current->fsuid);
+       user = key_user_lookup(current_fsuid());
        if (!user)
                return ERR_PTR(-ENOMEM);
 
index bd237b0..729156b 100644 (file)
@@ -195,7 +195,7 @@ struct key *request_key_auth_new(struct key *target, const void *callout_info,
        sprintf(desc, "%x", target->serial);
 
        authkey = key_alloc(&key_type_request_key_auth, desc,
-                           current->fsuid, current->fsgid, current,
+                           current_fsuid(), current_fsgid(), current,
                            KEY_POS_VIEW | KEY_POS_READ | KEY_POS_SEARCH |
                            KEY_USR_VIEW, KEY_ALLOC_NOT_IN_QUOTA);
        if (IS_ERR(authkey)) {