* 02111-1307, USA.
*/
#include <linux/sched.h>
+#include <linux/user_namespace.h>
+#include <linux/nsproxy.h>
#include "ecryptfs_kernel.h"
static LIST_HEAD(ecryptfs_msg_ctx_free_list);
/**
* ecryptfs_find_daemon_by_euid
* @euid: The effective user id which maps to the desired daemon id
+ * @user_ns: The namespace in which @euid applies
* @daemon: If return value is zero, points to the desired daemon pointer
*
* Must be called with ecryptfs_daemon_hash_mux held.
*
* Returns zero if the user id exists in the list; non-zero otherwise.
*/
-int ecryptfs_find_daemon_by_euid(struct ecryptfs_daemon **daemon, uid_t euid)
+int ecryptfs_find_daemon_by_euid(struct ecryptfs_daemon **daemon, uid_t euid,
+ struct user_namespace *user_ns)
{
struct hlist_node *elem;
int rc;
hlist_for_each_entry(*daemon, elem,
&ecryptfs_daemon_hash[ecryptfs_uid_hash(euid)],
euid_chain) {
- if ((*daemon)->euid == euid) {
+ if ((*daemon)->euid == euid && (*daemon)->user_ns == user_ns) {
rc = 0;
goto out;
}
return rc;
}
-static int
-ecryptfs_send_message_locked(unsigned int transport, char *data, int data_len,
- u8 msg_type, struct ecryptfs_msg_ctx **msg_ctx);
-
-/**
- * ecryptfs_send_raw_message
- * @transport: Transport type
- * @msg_type: Message type
- * @daemon: Daemon struct for recipient of message
- *
- * A raw message is one that does not include an ecryptfs_message
- * struct. It simply has a type.
- *
- * Must be called with ecryptfs_daemon_hash_mux held.
- *
- * Returns zero on success; non-zero otherwise
- */
-static int ecryptfs_send_raw_message(unsigned int transport, u8 msg_type,
- struct ecryptfs_daemon *daemon)
-{
- struct ecryptfs_msg_ctx *msg_ctx;
- int rc;
-
- switch(transport) {
- case ECRYPTFS_TRANSPORT_NETLINK:
- rc = ecryptfs_send_netlink(NULL, 0, NULL, msg_type, 0,
- daemon->pid);
- break;
- case ECRYPTFS_TRANSPORT_MISCDEV:
- rc = ecryptfs_send_message_locked(transport, NULL, 0, msg_type,
- &msg_ctx);
- if (rc) {
- printk(KERN_ERR "%s: Error whilst attempting to send "
- "message via procfs; rc = [%d]\n", __func__, rc);
- goto out;
- }
- /* Raw messages are logically context-free (e.g., no
- * reply is expected), so we set the state of the
- * ecryptfs_msg_ctx object to indicate that it should
- * be freed as soon as the transport sends out the message. */
- mutex_lock(&msg_ctx->mux);
- msg_ctx->state = ECRYPTFS_MSG_CTX_STATE_NO_REPLY;
- mutex_unlock(&msg_ctx->mux);
- break;
- case ECRYPTFS_TRANSPORT_CONNECTOR:
- case ECRYPTFS_TRANSPORT_RELAYFS:
- default:
- rc = -ENOSYS;
- }
-out:
- return rc;
-}
-
/**
* ecryptfs_spawn_daemon - Create and initialize a new daemon struct
* @daemon: Pointer to set to newly allocated daemon struct
* @euid: Effective user id for the daemon
+ * @user_ns: The namespace in which @euid applies
* @pid: Process id for the daemon
*
* Must be called ceremoniously while in possession of
* Returns zero on success; non-zero otherwise
*/
int
-ecryptfs_spawn_daemon(struct ecryptfs_daemon **daemon, uid_t euid, pid_t pid)
+ecryptfs_spawn_daemon(struct ecryptfs_daemon **daemon, uid_t euid,
+ struct user_namespace *user_ns, struct pid *pid)
{
int rc = 0;
(*daemon) = kzalloc(sizeof(**daemon), GFP_KERNEL);
if (!(*daemon)) {
rc = -ENOMEM;
- printk(KERN_ERR "%s: Failed to allocate [%Zd] bytes of "
+ printk(KERN_ERR "%s: Failed to allocate [%zd] bytes of "
"GFP_KERNEL memory\n", __func__, sizeof(**daemon));
goto out;
}
(*daemon)->euid = euid;
- (*daemon)->pid = pid;
+ (*daemon)->user_ns = get_user_ns(user_ns);
+ (*daemon)->pid = get_pid(pid);
(*daemon)->task = current;
mutex_init(&(*daemon)->mux);
INIT_LIST_HEAD(&(*daemon)->msg_ctx_out_queue);
}
/**
- * ecryptfs_process_helo
- * @transport: The underlying transport (netlink, etc.)
- * @euid: The user ID owner of the message
- * @pid: The process ID for the userspace program that sent the
- * message
- *
- * Adds the euid and pid values to the daemon euid hash. If an euid
- * already has a daemon pid registered, the daemon will be
- * unregistered before the new daemon is put into the hash list.
- * Returns zero after adding a new daemon to the hash list;
- * non-zero otherwise.
- */
-int ecryptfs_process_helo(unsigned int transport, uid_t euid, pid_t pid)
-{
- struct ecryptfs_daemon *new_daemon;
- struct ecryptfs_daemon *old_daemon;
- int rc;
-
- mutex_lock(&ecryptfs_daemon_hash_mux);
- rc = ecryptfs_find_daemon_by_euid(&old_daemon, euid);
- if (rc != 0) {
- printk(KERN_WARNING "Received request from user [%d] "
- "to register daemon [%d]; unregistering daemon "
- "[%d]\n", euid, pid, old_daemon->pid);
- rc = ecryptfs_send_raw_message(transport, ECRYPTFS_MSG_QUIT,
- old_daemon);
- if (rc)
- printk(KERN_WARNING "Failed to send QUIT "
- "message to daemon [%d]; rc = [%d]\n",
- old_daemon->pid, rc);
- hlist_del(&old_daemon->euid_chain);
- kfree(old_daemon);
- }
- rc = ecryptfs_spawn_daemon(&new_daemon, euid, pid);
- if (rc)
- printk(KERN_ERR "%s: The gods are displeased with this attempt "
- "to create a new daemon object for euid [%d]; pid [%d]; "
- "rc = [%d]\n", __func__, euid, pid, rc);
- mutex_unlock(&ecryptfs_daemon_hash_mux);
- return rc;
-}
-
-/**
* ecryptfs_exorcise_daemon - Destroy the daemon struct
*
* Must be called ceremoniously while in possession of
|| (daemon->flags & ECRYPTFS_DAEMON_IN_POLL)) {
rc = -EBUSY;
printk(KERN_WARNING "%s: Attempt to destroy daemon with pid "
- "[%d], but it is in the midst of a read or a poll\n",
+ "[0x%p], but it is in the midst of a read or a poll\n",
__func__, daemon->pid);
mutex_unlock(&daemon->mux);
goto out;
hlist_del(&daemon->euid_chain);
if (daemon->task)
wake_up_process(daemon->task);
+ if (daemon->pid)
+ put_pid(daemon->pid);
+ if (daemon->user_ns)
+ put_user_ns(daemon->user_ns);
mutex_unlock(&daemon->mux);
- memset(daemon, 0, sizeof(*daemon));
- kfree(daemon);
+ kzfree(daemon);
out:
return rc;
}
/**
* ecryptfs_process_quit
* @euid: The user ID owner of the message
+ * @user_ns: The namespace in which @euid applies
* @pid: The process ID for the userspace program that sent the
* message
*
* it is the registered that is requesting the deletion. Returns zero
* after deleting the desired daemon; non-zero otherwise.
*/
-int ecryptfs_process_quit(uid_t euid, pid_t pid)
+int ecryptfs_process_quit(uid_t euid, struct user_namespace *user_ns,
+ struct pid *pid)
{
struct ecryptfs_daemon *daemon;
int rc;
mutex_lock(&ecryptfs_daemon_hash_mux);
- rc = ecryptfs_find_daemon_by_euid(&daemon, euid);
+ rc = ecryptfs_find_daemon_by_euid(&daemon, euid, user_ns);
if (rc || !daemon) {
rc = -EINVAL;
printk(KERN_ERR "Received request from user [%d] to "
- "unregister unrecognized daemon [%d]\n", euid, pid);
+ "unregister unrecognized daemon [0x%p]\n", euid, pid);
goto out_unlock;
}
rc = ecryptfs_exorcise_daemon(daemon);
* Returns zero on success; non-zero otherwise
*/
int ecryptfs_process_response(struct ecryptfs_message *msg, uid_t euid,
- pid_t pid, u32 seq)
+ struct user_namespace *user_ns, struct pid *pid,
+ u32 seq)
{
struct ecryptfs_daemon *daemon;
struct ecryptfs_msg_ctx *msg_ctx;
size_t msg_size;
+ struct nsproxy *nsproxy;
+ struct user_namespace *tsk_user_ns;
+ uid_t ctx_euid;
int rc;
if (msg->index >= ecryptfs_message_buf_len) {
msg_ctx = &ecryptfs_msg_ctx_arr[msg->index];
mutex_lock(&msg_ctx->mux);
mutex_lock(&ecryptfs_daemon_hash_mux);
- rc = ecryptfs_find_daemon_by_euid(&daemon, msg_ctx->task->euid);
+ rcu_read_lock();
+ nsproxy = task_nsproxy(msg_ctx->task);
+ if (nsproxy == NULL) {
+ rc = -EBADMSG;
+ printk(KERN_ERR "%s: Receiving process is a zombie. Dropping "
+ "message.\n", __func__);
+ rcu_read_unlock();
+ mutex_unlock(&ecryptfs_daemon_hash_mux);
+ goto wake_up;
+ }
+ tsk_user_ns = __task_cred(msg_ctx->task)->user->user_ns;
+ ctx_euid = task_euid(msg_ctx->task);
+ rc = ecryptfs_find_daemon_by_euid(&daemon, ctx_euid, tsk_user_ns);
+ rcu_read_unlock();
mutex_unlock(&ecryptfs_daemon_hash_mux);
if (rc) {
rc = -EBADMSG;
printk(KERN_WARNING "%s: User [%d] received a "
- "message response from process [%d] but does "
+ "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 (tsk_user_ns != user_ns) {
+ rc = -EBADMSG;
+ printk(KERN_WARNING "%s: Received message from user_ns "
+ "[0x%p]; expected message from user_ns [0x%p]\n",
+ __func__, user_ns, tsk_user_ns);
goto unlock;
}
if (daemon->pid != pid) {
rc = -EBADMSG;
printk(KERN_ERR "%s: User [%d] sent a message response "
- "from an unrecognized process [%d]\n",
- __func__, msg_ctx->task->euid, pid);
+ "from an unrecognized process [0x%p]\n",
+ __func__, ctx_euid, pid);
goto unlock;
}
if (msg_ctx->state != ECRYPTFS_MSG_CTX_STATE_PENDING) {
msg_ctx->msg = kmalloc(msg_size, GFP_KERNEL);
if (!msg_ctx->msg) {
rc = -ENOMEM;
- printk(KERN_ERR "%s: Failed to allocate [%Zd] bytes of "
+ printk(KERN_ERR "%s: Failed to allocate [%zd] bytes of "
"GFP_KERNEL memory\n", __func__, msg_size);
goto unlock;
}
/**
* ecryptfs_send_message_locked
- * @transport: The transport over which to send the message (i.e.,
- * netlink)
* @data: The data to send
* @data_len: The length of data
* @msg_ctx: The message context allocated for the send
* Returns zero on success; non-zero otherwise
*/
static int
-ecryptfs_send_message_locked(unsigned int transport, char *data, int data_len,
- u8 msg_type, struct ecryptfs_msg_ctx **msg_ctx)
+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_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);
ecryptfs_msg_ctx_free_to_alloc(*msg_ctx);
mutex_unlock(&(*msg_ctx)->mux);
mutex_unlock(&ecryptfs_msg_ctx_lists_mux);
- switch (transport) {
- case ECRYPTFS_TRANSPORT_NETLINK:
- rc = ecryptfs_send_netlink(data, data_len, *msg_ctx, msg_type,
- 0, daemon->pid);
- break;
- case ECRYPTFS_TRANSPORT_MISCDEV:
- rc = ecryptfs_send_miscdev(data, data_len, *msg_ctx, msg_type,
- 0, daemon);
- break;
- case ECRYPTFS_TRANSPORT_CONNECTOR:
- case ECRYPTFS_TRANSPORT_RELAYFS:
- default:
- rc = -ENOSYS;
- }
+ rc = ecryptfs_send_miscdev(data, data_len, *msg_ctx, msg_type, 0,
+ daemon);
if (rc)
printk(KERN_ERR "%s: Error attempting to send message to "
"userspace daemon; rc = [%d]\n", __func__, rc);
/**
* ecryptfs_send_message
- * @transport: The transport over which to send the message (i.e.,
- * netlink)
* @data: The data to send
* @data_len: The length of data
* @msg_ctx: The message context allocated for the send
*
* Returns zero on success; non-zero otherwise
*/
-int ecryptfs_send_message(unsigned int transport, char *data, int data_len,
+int ecryptfs_send_message(char *data, int data_len,
struct ecryptfs_msg_ctx **msg_ctx)
{
int rc;
mutex_lock(&ecryptfs_daemon_hash_mux);
- rc = ecryptfs_send_message_locked(transport, data, data_len,
- ECRYPTFS_MSG_REQUEST, msg_ctx);
+ rc = ecryptfs_send_message_locked(data, data_len, ECRYPTFS_MSG_REQUEST,
+ msg_ctx);
mutex_unlock(&ecryptfs_daemon_hash_mux);
return rc;
}
return rc;
}
-int ecryptfs_init_messaging(unsigned int transport)
+int ecryptfs_init_messaging(void)
{
int i;
int rc = 0;
mutex_unlock(&ecryptfs_msg_ctx_arr[i].mux);
}
mutex_unlock(&ecryptfs_msg_ctx_lists_mux);
- switch(transport) {
- case ECRYPTFS_TRANSPORT_NETLINK:
- rc = ecryptfs_init_netlink();
- if (rc)
- ecryptfs_release_messaging(transport);
- break;
- case ECRYPTFS_TRANSPORT_MISCDEV:
- rc = ecryptfs_init_ecryptfs_miscdev();
- if (rc)
- ecryptfs_release_messaging(transport);
- break;
- case ECRYPTFS_TRANSPORT_CONNECTOR:
- case ECRYPTFS_TRANSPORT_RELAYFS:
- default:
- rc = -ENOSYS;
- }
+ rc = ecryptfs_init_ecryptfs_miscdev();
+ if (rc)
+ ecryptfs_release_messaging();
out:
return rc;
}
-void ecryptfs_release_messaging(unsigned int transport)
+void ecryptfs_release_messaging(void)
{
if (ecryptfs_msg_ctx_arr) {
int i;
kfree(ecryptfs_daemon_hash);
mutex_unlock(&ecryptfs_daemon_hash_mux);
}
- switch(transport) {
- case ECRYPTFS_TRANSPORT_NETLINK:
- ecryptfs_release_netlink();
- break;
- case ECRYPTFS_TRANSPORT_MISCDEV:
- ecryptfs_destroy_ecryptfs_miscdev();
- break;
- case ECRYPTFS_TRANSPORT_CONNECTOR:
- case ECRYPTFS_TRANSPORT_RELAYFS:
- default:
- break;
- }
+ ecryptfs_destroy_ecryptfs_miscdev();
return;
}
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff