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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
commit 4eea03539d
2 changed files with 22 additions and 16 deletions
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18
fs/ecryptfs/messaging.c
View file

@ -361,6 +361,7 @@ int ecryptfs_process_response(struct ecryptfs_message *msg, uid_t euid,
size_t msg_size;
struct nsproxy *nsproxy;
struct user_namespace *current_user_ns;
uid_t ctx_euid;
int rc;
if (msg->index >= ecryptfs_message_buf_len) {
@ -385,8 +386,8 @@ int ecryptfs_process_response(struct ecryptfs_message *msg, uid_t euid,
goto wake_up;
}
current_user_ns = nsproxy->user_ns;
rc = ecryptfs_find_daemon_by_euid(&daemon, msg_ctx->task->euid,
current_user_ns);
ctx_euid = task_euid(msg_ctx->task);
rc = ecryptfs_find_daemon_by_euid(&daemon, ctx_euid, current_user_ns);
rcu_read_unlock();
mutex_unlock(&ecryptfs_daemon_hash_mux);
if (rc) {
@ -394,14 +395,14 @@ int ecryptfs_process_response(struct ecryptfs_message *msg, uid_t euid,
printk(KERN_WARNING "%s: User [%d] received a "
"message response from process [0x%p] but does "
"not have a registered daemon\n", __func__,
msg_ctx->task->euid, pid);
ctx_euid, pid);
goto wake_up;
}
if (msg_ctx->task->euid != euid) {
if (ctx_euid != euid) {
rc = -EBADMSG;
printk(KERN_WARNING "%s: Received message from user "
"[%d]; expected message from user [%d]\n", __func__,
euid, msg_ctx->task->euid);
euid, ctx_euid);
goto unlock;
}
if (current_user_ns != user_ns) {
@ -415,7 +416,7 @@ int ecryptfs_process_response(struct ecryptfs_message *msg, uid_t euid,
rc = -EBADMSG;
printk(KERN_ERR "%s: User [%d] sent a message response "
"from an unrecognized process [0x%p]\n",
__func__, msg_ctx->task->euid, pid);
__func__, ctx_euid, pid);
goto unlock;
}
if (msg_ctx->state != ECRYPTFS_MSG_CTX_STATE_PENDING) {
@ -464,14 +465,15 @@ ecryptfs_send_message_locked(char *data, int data_len, u8 msg_type,
struct ecryptfs_msg_ctx **msg_ctx)
{
struct ecryptfs_daemon *daemon;
uid_t euid = current_euid();
int rc;
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 = -ENOTCONN;
printk(KERN_ERR "%s: User [%d] does not have a daemon "
"registered\n", __func__, current->euid);
"registered\n", __func__, euid);
goto out;
}
mutex_lock(&ecryptfs_msg_ctx_lists_mux);