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Miklos Szeredi 27c1936af5 ovl: allow upperdir inside lowerdir 
commit 708fa01597fa002599756bf56a96d0de1677375c upstream.

Commit 146d62e5a586 ("ovl: detect overlapping layers") made sure we don't
have overlapping layers, but it also broke the arguably valid use case of

 mount -olowerdir=/,upperdir=/subdir,..

where upperdir overlaps lowerdir on the same filesystem.  This has been
causing regressions.

Revert the check, but only for the specific case where upperdir and/or
workdir are subdirectories of lowerdir.  Any other overlap (e.g. lowerdir
is subdirectory of upperdir, etc) case is crazy, so leave the check in
place for those.

Overlaps are detected at lookup time too, so reverting the mount time check
should be safe.

Fixes: 146d62e5a586 ("ovl: detect overlapping layers")
Cc: <stable@vger.kernel.org> # v5.2
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2021-05-07 11:04:33 +02:00
..
9p
fs: 9p: add generic splice_write file operation
2020-12-01 21:40:47 +01:00
adfs
Merge branch 'work.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2020-10-24 12:26:05 -07:00
affs
fs/affs: release old buffer head on error path
2021-03-04 11:38:37 +01:00
afs
afs: Stop listxattr() from listing "afs.*" attributes
2021-03-25 09:04:07 +01:00
autofs
autofs: harden ioctl table
2020-10-16 11:11:22 -07:00
befs
[PATCH] reduce boilerplate in fsid handling
2020-09-18 16:45:50 -04:00
bfs
bfs: don't use WARNING: string when it's just info.
2021-01-06 14:56:52 +01:00
btrfs
btrfs: fix sleep while in non-sleep context during qgroup removal
2021-03-30 14:31:53 +02:00
cachefiles
fs/cachefiles: Remove wait_bit_key layout dependency
2021-03-30 14:32:07 +02:00
ceph
ceph: fix flush_snap logic after putting caps
2021-03-04 11:38:08 +01:00
cifs
cifs: Silently ignore unknown oplock break handle
2021-04-10 13:36:10 +02:00
coda
…
configfs
configfs: fix a use-after-free in __configfs_open_file
2021-03-17 17:06:34 +01:00
cramfs
[PATCH] reduce boilerplate in fsid handling
2020-09-18 16:45:50 -04:00
crypto
fscrypt: add fscrypt_is_nokey_name()
2020-12-26 16:02:43 +01:00
debugfs
debugfs: do not attempt to create a new file before the filesystem is initalized
2021-03-04 11:37:17 +01:00
devpts
…
dlm
networking changes for the 5.10 merge window
2020-10-15 18:42:13 -07:00
ecryptfs
mm, treewide: rename kzfree() to kfree_sensitive()
2020-08-07 11:33:22 -07:00
efivarfs
efivarfs: revert "fix memory leak in efivarfs_create()"
2020-11-25 16:55:02 +01:00
efs
[PATCH] reduce boilerplate in fsid handling
2020-09-18 16:45:50 -04:00
erofs
erofs: fix shift-out-of-bounds of blkszbits
2021-03-07 12:34:05 +01:00
exfat
exfat: fix shift-out-of-bounds in exfat_fill_super()
2021-03-04 11:38:41 +01:00
exportfs
…
ext2
Merge branch 'work.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2020-10-24 12:26:05 -07:00
ext4
ext4: do not iput inode under running transaction in ext4_rename()
2021-04-07 15:00:06 +02:00
f2fs
f2fs: fix to set/clear I_LINKABLE under i_lock
2021-03-07 12:34:12 +01:00
fat
[PATCH] reduce boilerplate in fsid handling
2020-09-18 16:45:50 -04:00
freevxfs
…
fscache
…
fuse
virtiofs: Fail dax mount if device does not support it
2021-04-07 15:00:03 +02:00
gfs2
gfs2: report "already frozen/thawed" errors
2021-04-16 11:43:20 +02:00
hfs
fs: Replace zero-length array with flexible-array member
2020-10-29 17:22:59 -05:00
hfsplus
fs: Replace zero-length array with flexible-array member
2020-10-29 17:22:59 -05:00
hostfs
hostfs: fix memory handling in follow_link()
2021-04-14 08:42:06 +02:00
hpfs
[PATCH] reduce boilerplate in fsid handling
2020-09-18 16:45:50 -04:00
hugetlbfs
mm: hugetlbfs: fix cannot migrate the fallocated HugeTLB page
2021-02-10 09:29:20 +01:00
iomap
iomap: Fix negative assignment to unsigned sis->pages in iomap_swapfile_activate
2021-04-07 15:00:04 +02:00
isofs
isofs: release buffer head before return
2021-03-04 11:38:00 +01:00
jbd2
jbd2: fix kernel-doc markups
2020-11-19 22:38:29 -05:00
jffs2
jffs2: fix use after free in jffs2_sum_write_data()
2021-03-04 11:37:51 +01:00
jfs
JFS: more checks for invalid superblock
2021-03-07 12:34:04 +01:00
kernfs
kernfs: wire up ->splice_read and ->splice_write
2021-01-27 11:55:29 +01:00
lockd
lockd: don't use interval-based rebinding over TCP
2020-12-30 11:53:30 +01:00
minix
[PATCH] reduce boilerplate in fsid handling
2020-09-18 16:45:50 -04:00
nfs
nfs: we don't support removing system.nfs4_acl
2021-03-30 14:31:52 +02:00
nfs_common
nfs_common: need lock during iterate through the list
2020-12-30 11:53:45 +01:00
nfsd
NFSD: fix error handling in NFSv4.0 callbacks
2021-04-07 15:00:05 +02:00
nilfs2
nilfs2: make splice write available again
2021-02-13 13:55:16 +01:00
nls
…
notify
fanotify: Fix sys_fanotify_mark() on native x86-32
2021-01-17 14:16:59 +01:00
ntfs
ntfs: check for valid standard information attribute
2021-02-26 10:13:00 +01:00
ocfs2
ocfs2: fix deadlock between setattr and dio_end_io_write
2021-04-14 08:41:58 +02:00
omfs
fs: omfs: use kmemdup() rather than kmalloc+memcpy
2020-09-22 23:39:45 -04:00
openpromfs
…
orangefs
orangefs: remove unnecessary assignment to variable ret
2020-08-04 15:01:58 -04:00
overlayfs
ovl: allow upperdir inside lowerdir
2021-05-07 11:04:33 +02:00
proc
proc: don't allow async path resolution of /proc/thread-self components
2021-03-04 11:38:42 +01:00
pstore
pstore: Fix warning in pstore_kill_sb()
2021-03-25 09:04:08 +01:00
qnx4
[PATCH] reduce boilerplate in fsid handling
2020-09-18 16:45:50 -04:00
qnx6
[PATCH] reduce boilerplate in fsid handling
2020-09-18 16:45:50 -04:00
quota
quota: Fix memory leak when handling corrupted quota file
2021-03-04 11:37:53 +01:00
ramfs
ramfs: fix nommu mmap with gaps in the page cache
2020-10-16 11:11:22 -07:00
reiserfs
reiserfs: update reiserfs_xattrs_initialized() condition
2021-04-07 15:00:10 +02:00
romfs
Merge branch 'work.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2020-10-24 12:26:05 -07:00
squashfs
squashfs: fix xattr id and id lookup sanity checks
2021-03-30 14:31:54 +02:00
sysfs
sysfs: Add sysfs_emit and sysfs_emit_at to format sysfs output
2020-10-02 12:02:30 +02:00
sysv
[PATCH] reduce boilerplate in fsid handling
2020-09-18 16:45:50 -04:00
tracefs
…
ubifs
ubifs: Fix error return code in alloc_wbufs()
2021-03-04 11:37:51 +01:00
udf
udf: fix silent AED tagLocation corruption
2021-03-17 17:06:23 +01:00
ufs
Merge branch 'work.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2020-10-24 12:26:05 -07:00
unicode
unicode: Add utf8_casefold_hash
2020-09-10 14:03:31 -07:00
vboxsf
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial
2020-10-15 15:11:56 -07:00
verity
…
xfs
xfs: Fix assert failure in xfs_setattr_size()
2021-03-07 12:34:05 +01:00
zonefs
zonefs: fix to update .i_wr_refcnt correctly in zonefs_open_zone()
2021-03-25 09:04:05 +01:00
aio.c
vfs: separate __sb_start_write into blocking and non-blocking helpers
2020-11-10 16:53:07 -08:00
anon_inodes.c
…
attr.c
…
bad_inode.c
…
binfmt_aout.c
…
binfmt_elf_fdpic.c
binfmt_elf, binfmt_elf_fdpic: use a VMA list snapshot
2020-10-16 11:11:21 -07:00
binfmt_elf.c
fs: Replace zero-length array with flexible-array member
2020-10-29 17:22:59 -05:00
binfmt_em86.c
…
binfmt_flat.c
binfmt_flat: revert "binfmt_flat: don't offset the data start"
2020-08-24 08:49:13 +10:00
binfmt_misc.c
binfmt_misc: fix possible deadlock in bm_register_write
2021-03-17 17:06:35 +01:00
binfmt_script.c
…
block_dev.c
block: don't ignore REQ_NOWAIT for direct IO
2021-04-16 11:43:21 +02:00
buffer.c
mm, memcg: rework remote charging API to support nesting
2020-10-18 09:27:09 -07:00
char_dev.c
…
compat_binfmt_elf.c
…
coredump.c
coredump: fix core_pattern parse error
2020-12-06 10:19:07 -08:00
d_path.c
fs: fix NULL dereference due to data race in prepend_path()
2020-10-14 14:54:45 -07:00
dax.c
mm: provide a saner PTE walking API for modules
2021-02-26 10:13:01 +01:00
dcache.c
vfs: Use sequence counter with associated spinlock
2020-07-29 16:14:27 +02:00
dcookies.c
…
direct-io.c
fs: direct-io: fix missing sdio->boundary
2021-04-14 08:41:58 +02:00
drop_caches.c
…
eventfd.c
…
eventpoll.c
kcmp: Support selection of SYS_kcmp without CHECKPOINT_RESTORE
2021-03-04 11:38:41 +01:00
exec.c
exec: Transform exec_update_mutex into a rw_semaphore
2021-01-09 13:46:24 +01:00
fcntl.c
fcntl: Fix potential deadlock in send_sig{io, urg}()
2021-01-06 14:56:53 +01:00
fhandle.c
…
file_table.c
task_work: cleanup notification modes
2020-10-17 15:05:30 -06:00
file.c
kernel/io_uring: cancel io_uring before task works
2021-01-30 13:55:18 +01:00
filesystems.c
…
fs_context.c
treewide: Use fallthrough pseudo-keyword
2020-08-23 17:36:59 -05:00
fs_parser.c
fs_parse: mark fs_param_bad_value() as static
2020-10-13 18:38:27 -07:00
fs_pin.c
…
fs_struct.c
vfs: Use sequence counter with associated spinlock
2020-07-29 16:14:27 +02:00
fs_types.c
…
fs-writeback.c
fs: fix lazytime expiration handling in __writeback_single_inode()
2021-01-27 11:54:53 +01:00
fsopen.c
treewide: Use fallthrough pseudo-keyword
2020-08-23 17:36:59 -05:00
init.c
init: add an init_dup helper
2020-08-04 21:02:38 -04:00
inode.c
fs: Handle I_DONTCACHE in iput_final() instead of generic_drop_inode()
2020-12-30 11:53:49 +01:00
internal.h
fs: remove compat_sys_mount
2020-09-22 23:45:57 -04:00
io_uring.c
io_uring: don't mark S_ISBLK async work as unbounded
2021-04-16 11:43:21 +02:00
io-wq.c
io_uring: always batch cancel in *cancel_files()
2021-02-13 13:54:56 +01:00
io-wq.h
io_uring: always batch cancel in *cancel_files()
2021-02-13 13:54:56 +01:00
ioctl.c
fs: remove ksys_ioctl
2020-07-31 08:16:01 +02:00
Kconfig
tmpfs: disallow CONFIG_TMPFS_INODE64 on alpha
2021-02-17 11:02:21 +01:00
Kconfig.binfmt
…
kernel_read_file.c
fs/kernel_file_read: Add "offset" arg for partial reads
2020-10-05 13:37:04 +02:00
libfs.c
libfs: fix error cast of negative value in simple_attr_write()
2020-11-22 10:48:22 -08:00
locks.c
Revert "nfsd4: a client's own opens needn't prevent delegations"
2021-03-20 10:43:44 +01:00
Makefile
Refactored code for 5.10:
2020-10-23 11:33:41 -07:00
mbcache.c
…
mount.h
…
mpage.c
…
namei.c
LOOKUP_MOUNTPOINT: we are cleaning "jumped" flag too late
2021-04-14 08:41:58 +02:00
namespace.c
umount(2): move the flag validity checks first
2021-01-19 18:27:32 +01:00
no-block.c
…
nsfs.c
…
open.c
openat2: reject RESOLVE_BENEATH|RESOLVE_IN_ROOT
2020-12-30 11:54:24 +01:00
pipe.c
fs/pipe: allow sendfile() to pipe again
2021-01-27 11:55:29 +01:00
pnode.c
…
pnode.h
mount: fix mounting of detached mounts onto targets that reside on shared mounts
2021-03-17 17:06:13 +01:00
posix_acl.c
…
proc_namespace.c
proc mountinfo: make splice available again
2020-12-30 11:54:02 +01:00
read_write.c
Refactored code for 5.10:
2020-10-23 11:33:41 -07:00
readdir.c
readdir: make sure to verify directory entry for legacy interfaces too
2021-04-21 13:00:54 +02:00
remap_range.c
vfs: move the remap range helpers to remap_range.c
2020-10-15 09:48:49 -07:00
select.c
kernel, fs: Introduce and use set_restart_fn() and arch_set_restart_data()
2021-03-25 09:04:16 +01:00
seq_file.c
fix return values of seq_read_iter()
2020-11-15 22:12:53 -05:00
signalfd.c
treewide: Use fallthrough pseudo-keyword
2020-08-23 17:36:59 -05:00
splice.c
io_uring-5.10-2020-10-24
2020-10-24 12:40:18 -07:00
stack.c
…
stat.c
fs: remove KSTAT_QUERY_FLAGS
2020-09-26 22:55:05 -04:00
statfs.c
Add a "nosymfollow" mount option.
2020-08-27 16:06:47 -04:00
super.c
vfs: move __sb_{start,end}_write* to fs.h
2020-11-10 16:53:11 -08:00
sync.c
…
timerfd.c
…
userfaultfd.c
mm: remove the now-unnecessary mmget_still_valid() hack
2020-10-16 11:11:22 -07:00
utimes.c
fs: expose utimes_common
2020-07-31 08:16:01 +02:00
xattr.c
fs/xattr.c: fix kernel-doc warnings for setxattr & removexattr
2020-10-13 18:38:27 -07:00