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Message-ID: <20080417153406.GA14215@sergelap.austin.ibm.com>
Date: Thu, 17 Apr 2008 10:34:06 -0500
From: "Serge E. Hallyn" <serue@...ibm.com>
To: Michael Halcrow <mhalcrow@...ibm.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>,
"Serge E. Hallyn" <serue@...ibm.com>,
linux-fsdevel@...r.kernel.org, containers@...ts.osdl.org,
linux-kernel@...r.kernel.org, ecryptfs-devel@...ts.sourceforge.net
Subject: Re: [PATCH] eCryptfs: Make key module subsystem respect namespaces
Quoting Michael Halcrow (mhalcrow@...ibm.com):
> On Tue, Apr 15, 2008 at 04:34:02PM -0500, Serge E. Hallyn wrote:
> > Quoting Andrew Morton (akpm@...ux-foundation.org):
> > > On Tue, 15 Apr 2008 15:23:13 -0500
> > > Michael Halcrow <mhalcrow@...ibm.com> wrote:
> > >
> > > > ...
> > > > + rc = ecryptfs_find_daemon_by_euid(&daemon, current->euid);
> > > > + if (daemon->pid != current->pid) {
> > > > + rc = ecryptfs_find_daemon_by_euid(&daemon, current->euid);
> > > > + BUG_ON(current->euid != daemon->euid);
> > > > + BUG_ON(current->pid != daemon->pid);
> > >
> > > This code uses pids and uids all over the place. Will it operate
> > > correctly in a containerised environment?
> >
> > Thanks Andrew.
> >
> > Mike, the pid_t definately needs to be replaced with a struct pid.
> >
> > As for the euid, it'd be best if you also compared the user_namespace *
> > to make sure we support one ecryptfs deamon per user namespace.
>
> Make eCryptfs key module subsystem respect namespaces.
>
> Since I will be removing the netlink interface in a future patch, I
> just made changes to the netlink.c code so that it will not break the
> build. With my recent patches, the kernel module currently defaults to
> the device handle interface rather than the netlink interface.
>
> Signed-off-by: Michael Halcrow <mhalcrow@...ibm.com>
> ---
> fs/ecryptfs/ecryptfs_kernel.h | 25 +++++++++-----
> fs/ecryptfs/messaging.c | 71 +++++++++++++++++++++++++++++-----------
> fs/ecryptfs/miscdev.c | 68 +++++++++++++++++++++++++--------------
> fs/ecryptfs/netlink.c | 25 +++++++++-----
> 4 files changed, 126 insertions(+), 63 deletions(-)
>
> diff --git a/fs/ecryptfs/ecryptfs_kernel.h b/fs/ecryptfs/ecryptfs_kernel.h
> index 88b85f7..dc11431 100644
> --- a/fs/ecryptfs/ecryptfs_kernel.h
> +++ b/fs/ecryptfs/ecryptfs_kernel.h
> @@ -34,6 +34,7 @@
> #include <linux/namei.h>
> #include <linux/scatterlist.h>
> #include <linux/hash.h>
> +#include <linux/nsproxy.h>
>
> /* Version verification for shared data structures w/ userspace */
> #define ECRYPTFS_VERSION_MAJOR 0x00
> @@ -410,8 +411,9 @@ struct ecryptfs_daemon {
> #define ECRYPTFS_DAEMON_MISCDEV_OPEN 0x00000008
> u32 flags;
> u32 num_queued_msg_ctx;
> - pid_t pid;
> + struct pid *pid;
> uid_t euid;
> + struct user_namespace *user_ns;
> struct task_struct *task;
> struct mutex mux;
> struct list_head msg_ctx_out_queue;
> @@ -610,10 +612,13 @@ int
> ecryptfs_setxattr(struct dentry *dentry, const char *name, const void *value,
> size_t size, int flags);
> int ecryptfs_read_xattr_region(char *page_virt, struct inode *ecryptfs_inode);
> -int ecryptfs_process_helo(unsigned int transport, uid_t uid, pid_t pid);
> -int ecryptfs_process_quit(uid_t uid, pid_t pid);
> -int ecryptfs_process_response(struct ecryptfs_message *msg, uid_t uid,
> - pid_t pid, u32 seq);
> +int ecryptfs_process_helo(unsigned int transport, uid_t euid,
> + struct user_namespace *user_ns, struct pid *pid);
> +int ecryptfs_process_quit(uid_t euid, struct user_namespace *user_ns,
> + struct pid *pid);
> +int ecryptfs_process_response(struct ecryptfs_message *msg, uid_t euid,
> + struct user_namespace *user_ns, struct pid *pid,
> + u32 seq);
> int ecryptfs_send_message(unsigned int transport, char *data, int data_len,
> struct ecryptfs_msg_ctx **msg_ctx);
> int ecryptfs_wait_for_response(struct ecryptfs_msg_ctx *msg_ctx,
> @@ -623,13 +628,13 @@ void ecryptfs_release_messaging(unsigned int transport);
>
> int ecryptfs_send_netlink(char *data, int data_len,
> struct ecryptfs_msg_ctx *msg_ctx, u8 msg_type,
> - u16 msg_flags, pid_t daemon_pid);
> + u16 msg_flags, struct pid *daemon_pid);
> int ecryptfs_init_netlink(void);
> void ecryptfs_release_netlink(void);
>
> int ecryptfs_send_connector(char *data, int data_len,
> struct ecryptfs_msg_ctx *msg_ctx, u8 msg_type,
> - u16 msg_flags, pid_t daemon_pid);
> + u16 msg_flags, struct pid *daemon_pid);
> int ecryptfs_init_connector(void);
> void ecryptfs_release_connector(void);
> void
> @@ -672,7 +677,8 @@ int ecryptfs_read_lower_page_segment(struct page *page_for_ecryptfs,
> struct inode *ecryptfs_inode);
> struct page *ecryptfs_get_locked_page(struct file *file, loff_t index);
> int ecryptfs_exorcise_daemon(struct ecryptfs_daemon *daemon);
> -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);
> int ecryptfs_parse_packet_length(unsigned char *data, size_t *size,
> size_t *length_size);
> int ecryptfs_write_packet_length(char *dest, size_t size,
> @@ -684,6 +690,7 @@ int ecryptfs_send_miscdev(char *data, size_t data_size,
> u16 msg_flags, struct ecryptfs_daemon *daemon);
> void ecryptfs_msg_ctx_alloc_to_free(struct ecryptfs_msg_ctx *msg_ctx);
> 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);
>
> #endif /* #ifndef ECRYPTFS_KERNEL_H */
> diff --git a/fs/ecryptfs/messaging.c b/fs/ecryptfs/messaging.c
> index e3f2e97..fad161b 100644
> --- a/fs/ecryptfs/messaging.c
> +++ b/fs/ecryptfs/messaging.c
> @@ -103,6 +103,7 @@ void ecryptfs_msg_ctx_alloc_to_free(struct ecryptfs_msg_ctx *msg_ctx)
> /**
> * 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.
> @@ -111,7 +112,8 @@ void ecryptfs_msg_ctx_alloc_to_free(struct ecryptfs_msg_ctx *msg_ctx)
> *
> * 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;
> @@ -119,7 +121,7 @@ int ecryptfs_find_daemon_by_euid(struct ecryptfs_daemon **daemon, uid_t euid)
> 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;
> }
> @@ -186,6 +188,7 @@ out:
> * 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
> @@ -194,7 +197,8 @@ out:
> * 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;
>
> @@ -206,6 +210,7 @@ ecryptfs_spawn_daemon(struct ecryptfs_daemon **daemon, uid_t euid, pid_t pid)
> goto out;
> }
> (*daemon)->euid = euid;
> + (*daemon)->user_ns = user_ns;
> (*daemon)->pid = pid;
You'll want to do a get_pid() here, no?
And get_user_ns().
It's not because you particulary need them to stick around, but just to
ensure no wraparound causes another daemon with the same struct pid or
user_namespace to be spawned. Pretty gosh-darned unlikely, but still...
> (*daemon)->task = current;
> mutex_init(&(*daemon)->mux);
> @@ -222,6 +227,7 @@ out:
> * ecryptfs_process_helo
> * @transport: The underlying transport (netlink, etc.)
> * @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
> *
> @@ -231,32 +237,33 @@ out:
> * 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)
> +int ecryptfs_process_helo(unsigned int transport, uid_t euid,
> + struct user_namespace *user_ns, struct pid *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);
> + rc = ecryptfs_find_daemon_by_euid(&old_daemon, euid, user_ns);
> if (rc != 0) {
> printk(KERN_WARNING "Received request from user [%d] "
> - "to register daemon [%d]; unregistering daemon "
> - "[%d]\n", euid, pid, old_daemon->pid);
> + "to register daemon [0x%p]; unregistering daemon "
> + "[0x%p]\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",
> + "message to daemon [0x%p]; rc = [%d]\n",
> old_daemon->pid, rc);
> hlist_del(&old_daemon->euid_chain);
> kfree(old_daemon);
> }
> - rc = ecryptfs_spawn_daemon(&new_daemon, euid, pid);
> + rc = ecryptfs_spawn_daemon(&new_daemon, euid, user_ns, 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);
> + "to create a new daemon object for euid [%d]; pid "
> + "[0x%p]; rc = [%d]\n", __func__, euid, pid, rc);
> mutex_unlock(&ecryptfs_daemon_hash_mux);
> return rc;
> }
> @@ -277,7 +284,7 @@ int ecryptfs_exorcise_daemon(struct ecryptfs_daemon *daemon)
> || (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;
> @@ -303,6 +310,7 @@ out:
> /**
> * 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
> *
> @@ -310,17 +318,18 @@ out:
> * 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);
> @@ -354,11 +363,13 @@ out_unlock:
> * 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;
> int rc;
>
> if (msg->index >= ecryptfs_message_buf_len) {
> @@ -372,12 +383,24 @@ int ecryptfs_process_response(struct ecryptfs_message *msg, uid_t euid,
> 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;
> + }
> + rc = ecryptfs_find_daemon_by_euid(&daemon, msg_ctx->task->euid,
> + nsproxy->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);
> goto wake_up;
> @@ -389,10 +412,17 @@ int ecryptfs_process_response(struct ecryptfs_message *msg, uid_t euid,
> euid, msg_ctx->task->euid);
> goto unlock;
> }
> + if (nsproxy->user_ns != user_ns) {
Since you didn't grab a ref to the nsproxy, it's possible that it will
have been freed before this, right? So you probably just want to grab a
copy of nsproxy->user_ns while under the rcu_read_lock, where you can be
sure it's still around.
Otherwise this looks good. Thanks, Mike.
> + rc = -EBADMSG;
> + printk(KERN_WARNING "%s: Received message from user_ns "
> + "[0x%p]; expected message from user_ns [0x%p]\n",
> + __func__, user_ns, nsproxy->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",
> + "from an unrecognized process [0x%p]\n",
> __func__, msg_ctx->task->euid, pid);
> goto unlock;
> }
> @@ -446,7 +476,8 @@ ecryptfs_send_message_locked(unsigned int transport, char *data, int data_len,
> struct ecryptfs_daemon *daemon;
> int rc;
>
> - rc = ecryptfs_find_daemon_by_euid(&daemon, current->euid);
> + rc = ecryptfs_find_daemon_by_euid(&daemon, current->euid,
> + current->nsproxy->user_ns);
> if (rc || !daemon) {
> rc = -ENOTCONN;
> printk(KERN_ERR "%s: User [%d] does not have a daemon "
> diff --git a/fs/ecryptfs/miscdev.c b/fs/ecryptfs/miscdev.c
> index f7f2d90..8d39a04 100644
> --- a/fs/ecryptfs/miscdev.c
> +++ b/fs/ecryptfs/miscdev.c
> @@ -46,7 +46,8 @@ ecryptfs_miscdev_poll(struct file *file, poll_table *pt)
>
> 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, current->euid,
> + current->nsproxy->user_ns);
> BUG_ON(rc || !daemon);
> mutex_lock(&daemon->mux);
> mutex_unlock(&ecryptfs_daemon_hash_mux);
> @@ -92,10 +93,12 @@ 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, current->euid,
> + current->nsproxy->user_ns);
> if (rc || !daemon) {
> rc = ecryptfs_spawn_daemon(&daemon, current->euid,
> - current->pid);
> + current->nsproxy->user_ns,
> + task_pid(current));
> if (rc) {
> printk(KERN_ERR "%s: Error attempting to spawn daemon; "
> "rc = [%d]\n", __func__, rc);
> @@ -103,18 +106,18 @@ ecryptfs_miscdev_open(struct inode *inode, struct file *file)
> }
> }
> mutex_lock(&daemon->mux);
> - if (daemon->pid != current->pid) {
> + if (daemon->pid != task_pid(current)) {
> rc = -EINVAL;
> - printk(KERN_ERR "%s: pid [%d] has registered with euid [%d], "
> - "but pid [%d] has attempted to open the handle "
> + printk(KERN_ERR "%s: pid [0x%p] has registered with euid [%d], "
> + "but pid [0x%p] has attempted to open the handle "
> "instead\n", __func__, daemon->pid, daemon->euid,
> - current->pid);
> + task_pid(current));
> goto out_unlock_daemon;
> }
> if (daemon->flags & ECRYPTFS_DAEMON_MISCDEV_OPEN) {
> rc = -EBUSY;
> printk(KERN_ERR "%s: Miscellaneous device handle may only be "
> - "opened once per daemon; pid [%d] already has this "
> + "opened once per daemon; pid [0x%p] already has this "
> "handle open\n", __func__, daemon->pid);
> goto out_unlock_daemon;
> }
> @@ -147,10 +150,11 @@ ecryptfs_miscdev_release(struct inode *inode, struct file *file)
> int rc;
>
> mutex_lock(&ecryptfs_daemon_hash_mux);
> - rc = ecryptfs_find_daemon_by_euid(&daemon, current->euid);
> + rc = ecryptfs_find_daemon_by_euid(&daemon, current->euid,
> + current->nsproxy->user_ns);
> BUG_ON(rc || !daemon);
> mutex_lock(&daemon->mux);
> - BUG_ON(daemon->pid != current->pid);
> + BUG_ON(daemon->pid != task_pid(current));
> BUG_ON(!(daemon->flags & ECRYPTFS_DAEMON_MISCDEV_OPEN));
> daemon->flags &= ~ECRYPTFS_DAEMON_MISCDEV_OPEN;
> atomic_dec(&ecryptfs_num_miscdev_opens);
> @@ -247,7 +251,8 @@ ecryptfs_miscdev_read(struct file *file, char __user *buf, size_t count,
>
> 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, current->euid,
> + current->nsproxy->user_ns);
> BUG_ON(rc || !daemon);
> mutex_lock(&daemon->mux);
> if (daemon->flags & ECRYPTFS_DAEMON_ZOMBIE) {
> @@ -285,7 +290,8 @@ check_list:
> goto check_list;
> }
> BUG_ON(current->euid != daemon->euid);
> - BUG_ON(current->pid != daemon->pid);
> + 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,
> struct ecryptfs_msg_ctx, daemon_out_list);
> BUG_ON(!msg_ctx);
> @@ -355,15 +361,18 @@ out_unlock_daemon:
> /**
> * ecryptfs_miscdev_helo
> * @euid: effective user id of miscdevess sending helo packet
> + * @user_ns: The namespace in which @euid applies
> * @pid: miscdevess id of miscdevess sending helo packet
> *
> * Returns zero on success; non-zero otherwise
> */
> -static int ecryptfs_miscdev_helo(uid_t uid, pid_t pid)
> +static int ecryptfs_miscdev_helo(uid_t euid, struct user_namespace *user_ns,
> + struct pid *pid)
> {
> int rc;
>
> - rc = ecryptfs_process_helo(ECRYPTFS_TRANSPORT_MISCDEV, uid, pid);
> + rc = ecryptfs_process_helo(ECRYPTFS_TRANSPORT_MISCDEV, euid, user_ns,
> + pid);
> if (rc)
> printk(KERN_WARNING "Error processing HELO; rc = [%d]\n", rc);
> return rc;
> @@ -372,15 +381,17 @@ static int ecryptfs_miscdev_helo(uid_t uid, pid_t pid)
> /**
> * ecryptfs_miscdev_quit
> * @euid: effective user id of miscdevess sending quit packet
> + * @user_ns: The namespace in which @euid applies
> * @pid: miscdevess id of miscdevess sending quit packet
> *
> * Returns zero on success; non-zero otherwise
> */
> -static int ecryptfs_miscdev_quit(uid_t euid, pid_t pid)
> +static int ecryptfs_miscdev_quit(uid_t euid, struct user_namespace *user_ns,
> + struct pid *pid)
> {
> int rc;
>
> - rc = ecryptfs_process_quit(euid, pid);
> + rc = ecryptfs_process_quit(euid, user_ns, pid);
> if (rc)
> printk(KERN_WARNING
> "Error processing QUIT message; rc = [%d]\n", rc);
> @@ -392,13 +403,15 @@ static int ecryptfs_miscdev_quit(uid_t euid, pid_t pid)
> * @data: Bytes comprising struct ecryptfs_message
> * @data_size: sizeof(struct ecryptfs_message) + data len
> * @euid: Effective user id of miscdevess sending the miscdev response
> + * @user_ns: The namespace in which @euid applies
> * @pid: Miscdevess id of miscdevess sending the miscdev response
> * @seq: Sequence number for miscdev response packet
> *
> * Returns zero on success; non-zero otherwise
> */
> static int ecryptfs_miscdev_response(char *data, size_t data_size,
> - uid_t euid, pid_t pid, u32 seq)
> + uid_t euid, struct user_namespace *user_ns,
> + struct pid *pid, u32 seq)
> {
> struct ecryptfs_message *msg = (struct ecryptfs_message *)data;
> int rc;
> @@ -410,7 +423,7 @@ static int ecryptfs_miscdev_response(char *data, size_t data_size,
> rc = -EINVAL;
> goto out;
> }
> - rc = ecryptfs_process_response(msg, euid, pid, seq);
> + rc = ecryptfs_process_response(msg, euid, user_ns, pid, seq);
> if (rc)
> printk(KERN_ERR
> "Error processing response message; rc = [%d]\n", rc);
> @@ -491,27 +504,32 @@ ecryptfs_miscdev_write(struct file *file, const char __user *buf,
> }
> rc = ecryptfs_miscdev_response(&data[i], packet_size,
> current->euid,
> - current->pid, seq);
> + current->nsproxy->user_ns,
> + task_pid(current), seq);
> if (rc)
> printk(KERN_WARNING "%s: Failed to deliver miscdev "
> "response to requesting operation; rc = [%d]\n",
> __func__, rc);
> break;
> case ECRYPTFS_MSG_HELO:
> - rc = ecryptfs_miscdev_helo(current->euid, current->pid);
> + rc = ecryptfs_miscdev_helo(current->euid,
> + current->nsproxy->user_ns,
> + task_pid(current));
> if (rc) {
> printk(KERN_ERR "%s: Error attempting to process "
> - "helo from pid [%d]; rc = [%d]\n", __func__,
> - current->pid, rc);
> + "helo from pid [0x%p]; rc = [%d]\n", __func__,
> + task_pid(current), rc);
> goto out_free;
> }
> break;
> case ECRYPTFS_MSG_QUIT:
> - rc = ecryptfs_miscdev_quit(current->euid, current->pid);
> + rc = ecryptfs_miscdev_quit(current->euid,
> + current->nsproxy->user_ns,
> + task_pid(current));
> if (rc) {
> printk(KERN_ERR "%s: Error attempting to process "
> - "quit from pid [%d]; rc = [%d]\n", __func__,
> - current->pid, rc);
> + "quit from pid [0x%p]; rc = [%d]\n", __func__,
> + task_pid(current), rc);
> goto out_free;
> }
> break;
> diff --git a/fs/ecryptfs/netlink.c b/fs/ecryptfs/netlink.c
> index eb70f69..e0abad6 100644
> --- a/fs/ecryptfs/netlink.c
> +++ b/fs/ecryptfs/netlink.c
> @@ -45,7 +45,7 @@ static struct sock *ecryptfs_nl_sock;
> */
> int ecryptfs_send_netlink(char *data, int data_len,
> struct ecryptfs_msg_ctx *msg_ctx, u8 msg_type,
> - u16 msg_flags, pid_t daemon_pid)
> + u16 msg_flags, struct pid *daemon_pid)
> {
> struct sk_buff *skb;
> struct nlmsghdr *nlh;
> @@ -60,7 +60,7 @@ int ecryptfs_send_netlink(char *data, int data_len,
> ecryptfs_printk(KERN_ERR, "Failed to allocate socket buffer\n");
> goto out;
> }
> - nlh = NLMSG_PUT(skb, daemon_pid, msg_ctx ? msg_ctx->counter : 0,
> + nlh = NLMSG_PUT(skb, pid_nr(daemon_pid), msg_ctx ? msg_ctx->counter : 0,
> msg_type, payload_len);
> nlh->nlmsg_flags = msg_flags;
> if (msg_ctx && payload_len) {
> @@ -69,7 +69,7 @@ int ecryptfs_send_netlink(char *data, int data_len,
> msg->data_len = data_len;
> memcpy(msg->data, data, data_len);
> }
> - rc = netlink_unicast(ecryptfs_nl_sock, skb, daemon_pid, 0);
> + rc = netlink_unicast(ecryptfs_nl_sock, skb, pid_nr(daemon_pid), 0);
> if (rc < 0) {
> ecryptfs_printk(KERN_ERR, "Failed to send eCryptfs netlink "
> "message; rc = [%d]\n", rc);
> @@ -99,6 +99,7 @@ static int ecryptfs_process_nl_response(struct sk_buff *skb)
> {
> struct nlmsghdr *nlh = nlmsg_hdr(skb);
> struct ecryptfs_message *msg = NLMSG_DATA(nlh);
> + struct pid *pid;
> int rc;
>
> if (skb->len - NLMSG_HDRLEN - sizeof(*msg) != msg->data_len) {
> @@ -107,8 +108,10 @@ static int ecryptfs_process_nl_response(struct sk_buff *skb)
> "incorrectly specified data length\n");
> goto out;
> }
> - rc = ecryptfs_process_response(msg, NETLINK_CREDS(skb)->uid,
> - NETLINK_CREDS(skb)->pid, nlh->nlmsg_seq);
> + pid = find_get_pid(NETLINK_CREDS(skb)->pid);
> + rc = ecryptfs_process_response(msg, NETLINK_CREDS(skb)->uid, NULL,
> + pid, nlh->nlmsg_seq);
> + put_pid(pid);
> if (rc)
> printk(KERN_ERR
> "Error processing response message; rc = [%d]\n", rc);
> @@ -126,11 +129,13 @@ out:
> */
> static int ecryptfs_process_nl_helo(struct sk_buff *skb)
> {
> + struct pid *pid;
> int rc;
>
> + pid = find_get_pid(NETLINK_CREDS(skb)->pid);
> rc = ecryptfs_process_helo(ECRYPTFS_TRANSPORT_NETLINK,
> - NETLINK_CREDS(skb)->uid,
> - NETLINK_CREDS(skb)->pid);
> + NETLINK_CREDS(skb)->uid, NULL, pid);
> + put_pid(pid);
> if (rc)
> printk(KERN_WARNING "Error processing HELO; rc = [%d]\n", rc);
> return rc;
> @@ -147,10 +152,12 @@ static int ecryptfs_process_nl_helo(struct sk_buff *skb)
> */
> static int ecryptfs_process_nl_quit(struct sk_buff *skb)
> {
> + struct pid *pid;
> int rc;
>
> - rc = ecryptfs_process_quit(NETLINK_CREDS(skb)->uid,
> - NETLINK_CREDS(skb)->pid);
> + pid = find_get_pid(NETLINK_CREDS(skb)->pid);
> + rc = ecryptfs_process_quit(NETLINK_CREDS(skb)->uid, NULL, pid);
> + put_pid(pid);
> if (rc)
> printk(KERN_WARNING
> "Error processing QUIT message; rc = [%d]\n", rc);
> --
> 1.5.3.6
--
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