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| author | Eric W. Biederman <ebiederm@xmission.com> | 2011-11-17 10:57:55 +0400 |
|---|---|---|
| committer | Eric W. Biederman <ebiederm@xmission.com> | 2012-04-08 03:55:53 +0400 |
| commit | 6f9ac6d93a0916de09d11b0a247ade8f4347728b (patch) | |
| tree | 93e47420422e8e99befd2c14aaab75fa167cbb59 | |
| parent | aeb3ae9da9b50a386b22af786d19b623e8d9f0fa (diff) | |
| download | linux-6f9ac6d93a0916de09d11b0a247ade8f4347728b.tar.xz | |
mqueue: Explicitly capture the user namespace to send the notification to.
Stop relying on user->user_ns which is going away and instead capture
the user_namespace of the process we are supposed to notify.
Acked-by: Serge Hallyn <serge.hallyn@canonical.com>
Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
| -rw-r--r-- | ipc/mqueue.c | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/ipc/mqueue.c b/ipc/mqueue.c index 28bd64ddeda3..b53cf3469d01 100644 --- a/ipc/mqueue.c +++ b/ipc/mqueue.c @@ -66,6 +66,7 @@ struct mqueue_inode_info { struct sigevent notify; struct pid* notify_owner; + struct user_namespace *notify_user_ns; struct user_struct *user; /* user who created, for accounting */ struct sock *notify_sock; struct sk_buff *notify_cookie; @@ -139,6 +140,7 @@ static struct inode *mqueue_get_inode(struct super_block *sb, INIT_LIST_HEAD(&info->e_wait_q[0].list); INIT_LIST_HEAD(&info->e_wait_q[1].list); info->notify_owner = NULL; + info->notify_user_ns = NULL; info->qsize = 0; info->user = NULL; /* set when all is ok */ memset(&info->attr, 0, sizeof(info->attr)); @@ -536,7 +538,7 @@ static void __do_notify(struct mqueue_inode_info *info) rcu_read_lock(); sig_i.si_pid = task_tgid_nr_ns(current, ns_of_pid(info->notify_owner)); - sig_i.si_uid = user_ns_map_uid(info->user->user_ns, + sig_i.si_uid = user_ns_map_uid(info->notify_user_ns, current_cred(), current_uid()); rcu_read_unlock(); @@ -550,7 +552,9 @@ static void __do_notify(struct mqueue_inode_info *info) } /* after notification unregisters process */ put_pid(info->notify_owner); + put_user_ns(info->notify_user_ns); info->notify_owner = NULL; + info->notify_user_ns = NULL; } wake_up(&info->wait_q); } @@ -575,7 +579,9 @@ static void remove_notification(struct mqueue_inode_info *info) netlink_sendskb(info->notify_sock, info->notify_cookie); } put_pid(info->notify_owner); + put_user_ns(info->notify_user_ns); info->notify_owner = NULL; + info->notify_user_ns = NULL; } static int mq_attr_ok(struct ipc_namespace *ipc_ns, struct mq_attr *attr) @@ -1140,6 +1146,7 @@ retry: } info->notify_owner = get_pid(task_tgid(current)); + info->notify_user_ns = get_user_ns(current_user_ns()); inode->i_atime = inode->i_ctime = CURRENT_TIME; } spin_unlock(&info->lock); |