4.8-stable review patch. If anyone has any objections, please let me know.
------------------
From: Eric W. Biederman <ebiederm@xxxxxxxxxxxx>
commit 069d5ac9ae0d271903cc4607890616418118379a upstream.
Seth Forshee reports that in 4.8-rcN some automounts are failing
because the requesting the automount changed.
The relevant call path is:
follow_automount()
->d_automount
autofs4_d_automount
autofs4_mount_wait
autofs4_wait
In autofs4_wait wq_uid and wq_gid are set to current_uid() and
current_gid respectively. With follow_automount now overriding creds
uid that we export to userspace changes and that breaks existing
setups.
To remove the regression set wq_uid and wq_gid from
current_real_cred()->uid and current_real_cred()->gid respectively.
This restores the current behavior as current->real_cred is identical
to current->cred except when override creds are used.
Fixes: aeaa4a79ff6a ("fs: Call d_automount with the filesystems creds")
Reported-by: Seth Forshee <seth.forshee@xxxxxxxxxxxxx>
Tested-by: Seth Forshee <seth.forshee@xxxxxxxxxxxxx>
Signed-off-by: "Eric W. Biederman" <ebiederm@xxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
fs/autofs4/waitq.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
--- a/fs/autofs4/waitq.c
+++ b/fs/autofs4/waitq.c
@@ -431,8 +431,8 @@ int autofs4_wait(struct autofs_sb_info *
memcpy(&wq->name, &qstr, sizeof(struct qstr));
wq->dev = autofs4_get_dev(sbi);
wq->ino = autofs4_get_ino(sbi);
- wq->uid = current_uid();
- wq->gid = current_gid();
+ wq->uid = current_real_cred()->uid;
+ wq->gid = current_real_cred()->gid;
wq->pid = pid;
wq->tgid = tgid;
wq->status = -EINTR; /* Status return if interrupted */
--
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