From e8fa91e03142b71883bee02513ed945e8e7ca3c0 Mon Sep 17 00:00:00 2001 From: Miklos Szeredi Date: Wed, 3 Jul 2013 10:20:40 +1000 Subject: autofs4: translate pids to the right namespace for the daemon The PID and the TGID of the process triggering the mount are sent to the daemon. Currently the global pid values are sent (ones valid in the initial pid namespace) but this is wrong if the autofs daemon itself is not running in the initial pid namespace. So send the pid values that are valid in the namespace of the autofs daemon. The namespace to use is taken from the oz_pgrp pid pointer, which was set at mount time to the mounting process' pid namespace. If the pid translation fails (the triggering process is in an unrelated pid namespace) then the automount fails with ENOENT. Signed-off-by: Miklos Szeredi Acked-by: Serge Hallyn Cc: Eric Biederman Cc: Ian Kent Cc: Oleg Nesterov Signed-off-by: Andrew Morton --- fs/autofs4/waitq.c | 16 ++++++++++++++-- 1 file changed, 14 insertions(+), 2 deletions(-) (limited to 'fs') diff --git a/fs/autofs4/waitq.c b/fs/autofs4/waitq.c index 3db70dae40d3..309ca6bcbb09 100644 --- a/fs/autofs4/waitq.c +++ b/fs/autofs4/waitq.c @@ -353,11 +353,23 @@ int autofs4_wait(struct autofs_sb_info *sbi, struct dentry *dentry, struct qstr qstr; char *name; int status, ret, type; + pid_t pid; + pid_t tgid; /* In catatonic mode, we don't wait for nobody */ if (sbi->catatonic) return -ENOENT; + /* + * Try translating pids to the namespace of the daemon. + * + * Zero means failure: we are in an unrelated pid namespace. + */ + pid = task_pid_nr_ns(current, ns_of_pid(sbi->oz_pgrp)); + tgid = task_tgid_nr_ns(current, ns_of_pid(sbi->oz_pgrp)); + if (pid == 0 || tgid == 0) + return -ENOENT; + if (!dentry->d_inode) { /* * A wait for a negative dentry is invalid for certain @@ -423,8 +435,8 @@ int autofs4_wait(struct autofs_sb_info *sbi, struct dentry *dentry, wq->ino = autofs4_get_ino(sbi); wq->uid = current_uid(); wq->gid = current_gid(); - wq->pid = current->pid; - wq->tgid = current->tgid; + wq->pid = pid; + wq->tgid = tgid; wq->status = -EINTR; /* Status return if interrupted */ wq->wait_ctr = 2; mutex_unlock(&sbi->wq_mutex); -- cgit v1.2.3