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CRED: Wrap task credential accesses in the eCryptFS filesystem

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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>
This commit is contained in:
David Howells
2008-11-14 10:38:49 +11:00
committed by James Morris
parent ec4c2aacd1
commit 4eea03539d
2 changed files with 22 additions and 16 deletions
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20
fs/ecryptfs/miscdev.c
View File

@ -42,11 +42,12 @@ ecryptfs_miscdev_poll(struct file *file, poll_table *pt)
{
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 @@ static int
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 @@ ecryptfs_miscdev_open(struct inode *inode, struct file *file)
"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 @@ static int
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 @@ ecryptfs_miscdev_read(struct file *file, char __user *buf, size_t count,
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 @@ check_list:
* 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 @@ ecryptfs_miscdev_write(struct file *file, const char __user *buf,
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 @@ ecryptfs_miscdev_write(struct file *file, const char __user *buf,
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 "