CRED: Wrap task credential accesses in the eCryptFS filesystem
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>
Cc: Mike Halcrow <mhalcrow@us.ibm.com>
Cc: Phillip Hellewell <phillip@hellewell.homeip.net>
Cc: ecryptfs-devel@lists.sourceforge.net
Signed-off-by: James Morris <jmorris@namei.org>
diff --git a/fs/ecryptfs/miscdev.c b/fs/ecryptfs/miscdev.c
index b484792..047ac60 100644
--- a/fs/ecryptfs/miscdev.c
+++ b/fs/ecryptfs/miscdev.c
@@ -42,11 +42,12 @@
{
struct ecryptfs_daemon *daemon;
unsigned int mask = 0;
+ uid_t euid = current_euid();
int rc;
mutex_lock(&ecryptfs_daemon_hash_mux);
/* TODO: Just use file->private_data? */
- rc = ecryptfs_find_daemon_by_euid(&daemon, current->euid,
+ rc = ecryptfs_find_daemon_by_euid(&daemon, euid,
current->nsproxy->user_ns);
BUG_ON(rc || !daemon);
mutex_lock(&daemon->mux);
@@ -83,6 +84,7 @@
ecryptfs_miscdev_open(struct inode *inode, struct file *file)
{
struct ecryptfs_daemon *daemon = NULL;
+ uid_t euid = current_euid();
int rc;
mutex_lock(&ecryptfs_daemon_hash_mux);
@@ -93,10 +95,10 @@
"count; rc = [%d]\n", __func__, rc);
goto out_unlock_daemon_list;
}
- rc = ecryptfs_find_daemon_by_euid(&daemon, current->euid,
+ rc = ecryptfs_find_daemon_by_euid(&daemon, euid,
current->nsproxy->user_ns);
if (rc || !daemon) {
- rc = ecryptfs_spawn_daemon(&daemon, current->euid,
+ rc = ecryptfs_spawn_daemon(&daemon, euid,
current->nsproxy->user_ns,
task_pid(current));
if (rc) {
@@ -147,10 +149,11 @@
ecryptfs_miscdev_release(struct inode *inode, struct file *file)
{
struct ecryptfs_daemon *daemon = NULL;
+ uid_t euid = current_euid();
int rc;
mutex_lock(&ecryptfs_daemon_hash_mux);
- rc = ecryptfs_find_daemon_by_euid(&daemon, current->euid,
+ rc = ecryptfs_find_daemon_by_euid(&daemon, euid,
current->nsproxy->user_ns);
BUG_ON(rc || !daemon);
mutex_lock(&daemon->mux);
@@ -246,11 +249,12 @@
char packet_length[3];
size_t i;
size_t total_length;
+ uid_t euid = current_euid();
int rc;
mutex_lock(&ecryptfs_daemon_hash_mux);
/* TODO: Just use file->private_data? */
- rc = ecryptfs_find_daemon_by_euid(&daemon, current->euid,
+ rc = ecryptfs_find_daemon_by_euid(&daemon, euid,
current->nsproxy->user_ns);
BUG_ON(rc || !daemon);
mutex_lock(&daemon->mux);
@@ -290,7 +294,7 @@
* message from the queue; try again */
goto check_list;
}
- BUG_ON(current->euid != daemon->euid);
+ BUG_ON(euid != daemon->euid);
BUG_ON(current->nsproxy->user_ns != daemon->user_ns);
BUG_ON(task_pid(current) != daemon->pid);
msg_ctx = list_first_entry(&daemon->msg_ctx_out_queue,
@@ -414,6 +418,7 @@
size_t packet_size, packet_size_length, i;
ssize_t sz = 0;
char *data;
+ uid_t euid = current_euid();
int rc;
if (count == 0)
@@ -463,8 +468,7 @@
goto out_free;
}
rc = ecryptfs_miscdev_response(&data[i], packet_size,
- current->euid,
- current->nsproxy->user_ns,
+ euid, current->nsproxy->user_ns,
task_pid(current), seq);
if (rc)
printk(KERN_WARNING "%s: Failed to deliver miscdev "