diff options
| author | Eric W. Biederman <ebiederm@xmission.com> | 2016-09-30 11:28:05 -0500 |
|---|---|---|
| committer | Eric W. Biederman <ebiederm@xmission.com> | 2016-09-30 12:48:01 -0500 |
| commit | 069d5ac9ae0d271903cc4607890616418118379a (patch) | |
| tree | c62c1c69d59207ef666ff55d0e44ecae847351f1 /fs/autofs4 | |
| parent | d29216842a85c7970c536108e093963f02714498 (diff) | |
| download | lwn-069d5ac9ae0d271903cc4607890616418118379a.tar.gz lwn-069d5ac9ae0d271903cc4607890616418118379a.zip | |
autofs: Fix automounts by using current_real_cred()->uid
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.
Cc: stable@vger.kernel.org
Fixes: aeaa4a79ff6a ("fs: Call d_automount with the filesystems creds")
Reported-by: Seth Forshee <seth.forshee@canonical.com>
Tested-by: Seth Forshee <seth.forshee@canonical.com>
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
Diffstat (limited to 'fs/autofs4')
| -rw-r--r-- | fs/autofs4/waitq.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/fs/autofs4/waitq.c b/fs/autofs4/waitq.c index 431fd7ee3488..e44271dfceb6 100644 --- a/fs/autofs4/waitq.c +++ b/fs/autofs4/waitq.c @@ -431,8 +431,8 @@ int autofs4_wait(struct autofs_sb_info *sbi, 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 */ |