linux-toradex.git/fs/autofs, branch toradex_4.20.y

autofs: fix error return in autofs_fill_super()

2019-03-13T21:04:08+00:00

[ Upstream commit f585b283e3f025754c45bbe7533fc6e5c4643700 ]

In autofs_fill_super() on error of get inode/make root dentry the return
should be ENOMEM as this is the only failure case of the called
functions.

Link: http://lkml.kernel.org/r/154725123240.11260.796773942606871359.stgit@pluto-themaw-net
Signed-off-by: Ian Kent 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds 
Signed-off-by: Sasha Levin

autofs: drop dentry reference only when it is never used

2019-03-13T21:04:08+00:00

[ Upstream commit 63ce5f552beb9bdb41546b3a26c4374758b21815 ]

autofs_expire_run() calls dput(dentry) to drop the reference count of
dentry.  However, dentry is read via autofs_dentry_ino(dentry) after
that.  This may result in a use-free-bug.  The patch drops the reference
count of dentry only when it is never used.

Link: http://lkml.kernel.org/r/154725122396.11260.16053424107144453867.stgit@pluto-themaw-net
Signed-off-by: Pan Bian 
Signed-off-by: Ian Kent 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds 
Signed-off-by: Sasha Levin

Merge branch 'akpm' (patches from Andrew)

2018-08-22T19:34:08+00:00

Merge more updates from Andrew Morton:

 - the rest of MM

 - procfs updates

 - various misc things

 - more y2038 fixes

 - get_maintainer updates

 - lib/ updates

 - checkpatch updates

 - various epoll updates

 - autofs updates

 - hfsplus

 - some reiserfs work

 - fatfs updates

 - signal.c cleanups

 - ipc/ updates

* emailed patches from Andrew Morton : (166 commits)
  ipc/util.c: update return value of ipc_getref from int to bool
  ipc/util.c: further variable name cleanups
  ipc: simplify ipc initialization
  ipc: get rid of ids->tables_initialized hack
  lib/rhashtable: guarantee initial hashtable allocation
  lib/rhashtable: simplify bucket_table_alloc()
  ipc: drop ipc_lock()
  ipc/util.c: correct comment in ipc_obtain_object_check
  ipc: rename ipcctl_pre_down_nolock()
  ipc/util.c: use ipc_rcu_putref() for failues in ipc_addid()
  ipc: reorganize initialization of kern_ipc_perm.seq
  ipc: compute kern_ipc_perm.id under the ipc lock
  init/Kconfig: remove EXPERT from CHECKPOINT_RESTORE
  fs/sysv/inode.c: use ktime_get_real_seconds() for superblock stamp
  adfs: use timespec64 for time conversion
  kernel/sysctl.c: fix typos in comments
  drivers/rapidio/devices/rio_mport_cdev.c: remove redundant pointer md
  fork: don't copy inconsistent signal handler state to child
  signal: make get_signal() return bool
  signal: make sigkill_pending() return bool
  ...

autofs: add AUTOFS_EXP_FORCED flag

2018-08-22T17:52:49+00:00

The userspace automount(8) daemon is meant to perform a forced expire when
sent a SIGUSR2.

But since the expiration is routed through the kernel and the kernel
doesn't send an expire request if the mount is busy this hasn't worked at
least since autofs version 5.

Add an AUTOFS_EXP_FORCED flag to allow implemention of the feature and
bump the protocol version so user space can check if it's implemented if
needed.

Link: http://lkml.kernel.org/r/152937734715.21213.6594007182776598970.stgit@pluto.themaw.net
Signed-off-by: Ian Kent 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

autofs: make expire flags usage consistent with v5 params

2018-08-22T17:52:49+00:00

Make the usage of the expire flags consistent by naming the expire flags
the same as it is named in the version 5 miscelaneous ioctl parameters and
only check the bit flags when needed.

Link: http://lkml.kernel.org/r/152937734046.21213.9454131988766280028.stgit@pluto.themaw.net
Signed-off-by: Ian Kent 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

autofs: make autofs_expire_indirect() static

2018-08-22T17:52:49+00:00

autofs_expire_indirect() isn't used outside of fs/autofs/expire.c so make
it static.

Link: http://lkml.kernel.org/r/152937733512.21213.10509996499623738446.stgit@pluto.themaw.net
Signed-off-by: Ian Kent 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

autofs: make autofs_expire_direct() static

2018-08-22T17:52:49+00:00

autofs_expire_direct() isn't used outside of fs/autofs/expire.c so make it
static.

Link: http://lkml.kernel.org/r/152937732944.21213.11821977712410930973.stgit@pluto.themaw.net
Signed-off-by: Ian Kent 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

autofs: fix clearing AUTOFS_EXP_LEAVES in autofs_expire_indirect()

2018-08-22T17:52:49+00:00

The expire flag AUTOFS_EXP_LEAVES is cleared before the second call to
should_expire() in autofs_expire_indirect() but the parameter passed in
the second call is incorrect.

Fortunately AUTOFS_EXP_LEAVES expire flag has not been used for a long
time but might be needed in the future so fix it rather than remove the
expire leaves functionality.

Link: http://lkml.kernel.org/r/152937732410.21213.7447294898147765076.stgit@pluto.themaw.net
Signed-off-by: Ian Kent 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

autofs: fix inconsistent use of now variable

2018-08-22T17:52:49+00:00

The global variable "now" in fs/autofs/expire.c is used in an inconsistent
way, sometimes using jiffies directly, and sometimes using the "now"
variable, and setting it isn't done consistently either.

But the autofs dentry info last_used field is only updated during path
walks or during expire so jiffies can be used directly and the global
variable "now" removed.

Link: http://lkml.kernel.org/r/152937731702.21213.7371321165189170865.stgit@pluto.themaw.net
Signed-off-by: Ian Kent 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

autofs: fix directory and symlink access

2018-08-22T17:52:49+00:00

Depending on how it is configured the autofs user space daemon can leave
in use mounts mounted at exit and re-connect to them at start up.  But for
this to work best the state of the autofs file system needs to be left
intact over the restart.

Also, at system shutdown, mounts in an autofs file system might be
umounted exposing a mount point trigger for which subsequent access can
lead to a hang.  So recent versions of automount(8) now does its best to
set autofs file system mounts catatonic at shutdown.

When autofs file system mounts are catatonic it's currently possible to
create and remove directories and symlinks which can be a problem at
restart, as described above.

So return EACCES in the directory, symlink and unlink methods if the
autofs file system is catatonic.

Link: http://lkml.kernel.org/r/152902119090.4144.9561910674530214291.stgit@pluto.themaw.net
Signed-off-by: Ian Kent 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds