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Aleksa Sarai fd59f1e5f2 namei: only return -ECHILD from follow_dotdot_rcu() 
commit 2b98149c2377bff12be5dd3ce02ae0506e2dd613 upstream.

It's over-zealous to return hard errors under RCU-walk here, given that
a REF-walk will be triggered for all other cases handling ".." under
RCU.

The original purpose of this check was to ensure that if a rename occurs
such that a directory is moved outside of the bind-mount which the
resolution started in, it would be detected and blocked to avoid being
able to mess with paths outside of the bind-mount. However, triggering a
new REF-walk is just as effective a solution.

Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Fixes: 397d425dc26d ("vfs: Test for and handle paths that are unreachable from their mnt_root")
Suggested-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Aleksa Sarai <cyphar@cyphar.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2020-03-11 07:51:14 +01:00
..
9p
9p: avoid attaching writeback_fid on mmap with type PRIVATE
2019-10-17 13:40:54 -07:00
adfs
fs/adfs: super: fix use-after-free bug
2019-08-06 18:28:26 +02:00
affs
affs_lookup(): close a race with affs_remove_link()
2018-05-30 07:48:51 +02:00
afs
afs: Fix afs_kill_pages()
2017-12-20 10:04:56 +01:00
autofs4
autofs: fix a leak in autofs_expire_indirect()
2019-12-21 10:34:21 +01:00
befs
…
bfs
bfs: add sanity check at bfs_fill_super()
2018-12-01 09:46:33 +01:00
btrfs
Btrfs: fix btrfs_wait_ordered_range() so that it waits for all ordered extents
2020-02-28 15:39:17 +01:00
cachefiles
fscache, cachefiles: remove redundant variable 'cache'
2018-12-17 21:55:12 +01:00
ceph
ceph: fix dentry leak in ceph_readdir_prepopulate
2019-11-28 18:25:48 +01:00
cifs
cifs: Fix mode output in debugging statements
2020-03-11 07:51:12 +01:00
coda
coda: add error handling for fget
2019-08-06 18:28:27 +02:00
configfs
configfs: fix a deadlock in configfs_symlink()
2019-11-12 19:13:24 +01:00
cramfs
Cramfs: fix abad comparison when wrap-arounds occur
2018-11-21 09:27:37 +01:00
debugfs
debugfs: fix use-after-free on symlink traversal
2019-05-16 19:45:01 +02:00
devpts
devpts: clean up interface to pty drivers
2016-08-16 09:30:49 +02:00
dlm
dlm: fix invalid cluster name warning
2019-12-21 10:34:44 +01:00
ecryptfs
ecryptfs: Fix up bad backport of fe2e082f5da5b4a0a92ae32978f81507ef37ec66
2020-03-11 07:51:14 +01:00
efivarfs
efi: Make efivarfs entries immutable by default
2016-03-03 15:07:09 -08:00
efs
…
exofs
fs/exofs: fix potential memory leak in mount option parsing
2018-11-27 16:08:00 +01:00
exportfs
exportfs: fix 'passing zero to ERR_PTR()' warning
2020-01-29 10:21:36 +01:00
ext2
ext2: Adjust indentation in ext2_fill_super
2020-02-14 16:29:58 -05:00
ext4
ext4: potential crash on allocation error in ext4_alloc_flex_bg_array()
2020-03-11 07:51:13 +01:00
f2fs
f2fs: return correct errno in f2fs_gc
2019-11-25 15:54:27 +01:00
fat
fat: work around race with userspace's read via blockdev while mounting
2019-10-07 21:01:02 +02:00
freevxfs
…
fscache
fscache: fix race between enablement and dropping of object
2018-12-17 21:55:11 +01:00
fuse
fuse: verify attributes
2019-12-21 10:34:49 +01:00
gfs2
gfs2: take jdata unstuff into account in do_grow
2019-12-05 15:26:52 +01:00
hfs
fs/hfs/extent.c: fix array out of bounds read of array extent
2019-11-28 18:25:57 +01:00
hfsplus
hfsplus: fix return value of hfsplus_get_block()
2019-11-28 18:25:56 +01:00
hostfs
hostfs: Freeing an ERR_PTR in hostfs_fill_sb_common()
2016-09-30 10:18:39 +02:00
hpfs
hpfs: implement the show_options method
2016-06-01 12:15:54 -07:00
hugetlbfs
hugetlb: use same fault hash key for shared and private mappings
2019-06-11 12:23:52 +02:00
isofs
isofs: fix timestamps beyond 2027
2017-11-30 08:37:20 +00:00
jbd2
jbd2: switch to use jbd2_journal_abort() when failed to submit the commit record
2020-02-28 15:39:06 +01:00
jffs2
jffs2: fix use-after-free on symlink traversal
2019-05-16 19:45:01 +02:00
jfs
jfs: fix bogus variable self-initialization
2020-01-29 10:21:41 +01:00
kernfs
kernfs: Fix range checks in kernfs_get_target_path
2019-11-25 15:53:59 +01:00
lockd
lockd: fix access beyond unterminated strings in prints
2018-11-21 09:27:36 +01:00
logfs
mm, fs: introduce mapping_gfp_constraint()
2015-11-06 17:50:42 -08:00
minix
…
ncpfs
ncpfs: fix build warning of strncpy
2019-03-23 08:44:21 +01:00
nfs
nfs: NFS_SWAP should depend on SWAP
2020-02-28 15:38:54 +01:00
nfs_common
lockd: fix "list_add double add" caused by legacy signal interface
2018-02-03 17:04:28 +01:00
nfsd
nfsd: Return EPERM, not EACCES, in some SETATTR cases
2019-12-21 10:34:45 +01:00
nilfs2
do d_instantiate/unlock_new_inode combinations safely
2018-05-30 07:48:52 +02:00
nls
…
notify
fanotify: fix logic of events on child
2018-04-24 09:32:11 +02:00
ntfs
mm, fs: introduce mapping_gfp_constraint()
2015-11-06 17:50:42 -08:00
ocfs2
ocfs2: fix a NULL pointer dereference when call ocfs2_update_inode_fsync_trans()
2020-02-28 15:39:08 +01:00
omfs
…
openpromfs
…
overlayfs
Revert "ovl: modify ovl_permission() to do checks on two inodes"
2020-02-14 16:29:56 -05:00
proc
mm/page_alloc.c: calculate 'available' memory in a separate function
2020-01-23 08:18:35 +01:00
pstore
pstore/ram: Write new dumps to start of recycled zones
2020-01-12 11:22:46 +01:00
qnx4
…
qnx6
…
quota
fs/quota: handle overflows of sysctl fs.quota.* and report as unsigned long
2020-01-04 13:34:32 +01:00
ramfs
mm, fs: obey gfp_mapping for add_to_page_cache()
2015-10-16 11:42:28 -07:00
reiserfs
reiserfs: prevent NULL pointer dereference in reiserfs_insert_item()
2020-02-28 15:39:09 +01:00
romfs
romfs: use different way to generate fsid for BLOCK or MTD
2017-06-17 06:39:38 +02:00
squashfs
squashfs: more metadata hardenings
2018-08-06 16:24:42 +02:00
sysfs
scsi: sysfs: Introduce sysfs_{un,}break_active_protection()
2018-09-05 09:18:40 +02:00
sysv
sysv: return 'err' instead of 0 in __sysv_write_inode
2018-12-17 21:55:09 +01:00
tracefs
tracefs: Fix refcount imbalance in start_creating()
2015-11-04 22:13:45 -05:00
ubifs
ubifs: Fix deadlock in concurrent bulk-read and writepage
2020-02-28 15:38:48 +01:00
udf
udf: Fix incorrect final NOT_ALLOCATED (hole) extent length
2019-07-21 09:07:08 +02:00
ufs
ufs: fix braino in ufs_get_inode_gid() for solaris UFS flavour
2019-06-11 12:23:49 +02:00
xfs
xfs: Sanity check flags of Q_XQUOTARM call
2020-01-29 10:21:35 +01:00
aio.c
aio: fix spectre gadget in lookup_ioctx
2018-12-21 14:09:50 +01:00
anon_inodes.c
…
attr.c
vfs: move permission checking into notify_change() for utimes(NULL)
2016-10-22 12:26:56 +02:00
bad_inode.c
…
binfmt_aout.c
…
binfmt_elf_fdpic.c
libnvdimm for 4.4:
2015-11-10 12:07:22 -08:00
binfmt_elf.c
binfmt_elf: switch to new creds when switching to new mm
2019-04-27 09:33:53 +02:00
binfmt_em86.c
…
binfmt_flat.c
fs/binfmt_flat.c: make load_flat_shared_library() work
2019-07-10 09:56:30 +02:00
binfmt_misc.c
fs/binfmt_misc.c: do not allow offset overflow
2018-07-03 11:21:26 +02:00
binfmt_script.c
exec: load_script: Do not exec truncated interpreter path
2019-11-06 12:09:12 +01:00
block_dev.c
fs/block_dev: always invalidate cleancache in invalidate_bdev()
2017-05-20 14:27:01 +02:00
buffer.c
fs: fix guard_bio_eod to check for real EOD errors
2019-04-27 09:33:49 +02:00
char_dev.c
chardev: Avoid potential use-after-free in 'chrdev_open()'
2020-01-14 20:03:00 +01:00
compat_binfmt_elf.c
binfmt_elf: compat: avoid unused function warning
2018-02-25 11:03:51 +01:00
compat_ioctl.c
compat_ioctl: pppoe: fix PPPOEIOCSFWD handling
2019-08-11 12:20:46 +02:00
compat.c
…
coredump.c
coredump: Ensure proper size of sparse core files
2017-07-05 14:37:20 +02:00
dax.c
dax: disable pmd mappings
2015-11-16 23:54:45 -08:00
dcache.c
fs/dcache: move security_d_instantiate() behind attaching dentry to inode
2019-11-10 11:21:39 +01:00
dcookies.c
…
direct-io.c
direct-io: Prevent NULL pointer access in submit_page_section
2017-10-18 09:20:42 +02:00
drop_caches.c
fs/drop_caches.c: avoid softlockups in drop_pagecache_sb()
2019-03-23 08:44:26 +01:00
eventfd.c
…
eventpoll.c
fs/epoll: drop ovflist branch prediction
2019-02-20 10:13:14 +01:00
exec.c
sched/fair: Don't free p->numa_faults with concurrent readers
2019-08-04 09:35:02 +02:00
fcntl.c
fs/fcntl: f_setown, avoid undefined behaviour
2018-01-31 12:06:11 +01:00
fhandle.c
fs/coredump: prevent fsuid=0 dumps into user-controlled directories
2016-04-12 09:08:58 -07:00
file_table.c
…
file.c
fs/file.c: initialize init_files.resize_wait
2019-04-27 09:33:49 +02:00
filesystems.c
…
fs_pin.c
…
fs_struct.c
…
fs-writeback.c
cgroup,writeback: don't switch wbs immediately on dead wbs if the memcg is dead
2019-11-12 19:13:31 +01:00
inode.c
Abort file_remove_privs() for non-reg. files
2019-06-22 08:18:27 +02:00
internal.h
…
ioctl.c
…
Kconfig
dax: disable pmd mappings
2015-11-16 23:54:45 -08:00
Kconfig.binfmt
…
libfs.c
…
locks.c
locks: print unsigned ino in /proc/locks
2020-01-12 11:22:41 +01:00
Makefile
ext4: promote ext4 over ext2 in the default probe order
2015-10-15 10:33:21 -04:00
mbcache.c
…
mount.h
mnt: In propgate_umount handle visiting mounts in any order
2017-07-21 07:44:57 +02:00
mpage.c
fs: add i_blocksize()
2017-06-14 13:16:24 +02:00
namei.c
namei: only return -ECHILD from follow_dotdot_rcu()
2020-03-11 07:51:14 +01:00
namespace.c
mount: Prevent MNT_DETACH from disconnecting locked mounts
2018-11-21 09:27:44 +01:00
no-block.c
…
nsfs.c
nsfs: mark dentry with DCACHE_RCUACCESS
2018-02-16 20:09:43 +01:00
open.c
access: avoid the RCU grace period for the temporary subjective credentials
2019-08-04 09:35:01 +02:00
pipe.c
pipe: cap initial pipe capacity according to pipe-max-size limit
2018-05-26 08:48:51 +02:00
pnode.c
mnt: Make propagate_umount less slow for overlapping mount propagation trees
2017-07-21 07:44:58 +02:00
pnode.h
mnt: Add a per mount namespace limit on the number of mounts
2017-04-30 05:49:28 +02:00
posix_acl.c
tmpfs: clear S_ISGID when setting posix ACLs
2017-01-26 08:23:47 +01:00
proc_namespace.c
vfs: show_vfsstat: do not ignore errors from show_devname method
2016-04-12 09:08:55 -07:00
read_write.c
fs: stream_open - opener for stream-like files so that read and write can run simultaneously without deadlock
2019-06-11 12:24:13 +02:00
readdir.c
filldir[64]: remove WARN_ON_ONCE() for bad directory entries
2020-01-04 13:34:37 +01:00
select.c
fs/select: add vmalloc fallback for select(2)
2018-01-31 12:06:09 +01:00
seq_file.c
Make file credentials available to the seqfile interfaces
2017-08-06 19:19:42 -07:00
signalfd.c
…
splice.c
vfs: fix uninitialized flags in splice_to_pipe()
2017-02-23 17:43:09 +01:00
stack.c
…
stat.c
ufs: restore maintaining ->i_blocks
2017-06-14 13:16:24 +02:00
statfs.c
…
super.c
fs: don't scan the inode cache before SB_BORN is set
2019-02-06 19:43:08 +01:00
sync.c
fs/sync.c: make sync_file_range(2) use WB_SYNC_NONE writeback
2015-11-06 17:50:42 -08:00
timerfd.c
timerfd: Protect the might cancel mechanism proper
2017-05-08 07:46:01 +02:00
userfaultfd.c
userfaultfd_release: always remove uffd flags and clear vm_userfaultfd_ctx
2019-09-06 10:18:09 +02:00
utimes.c
vfs: move permission checking into notify_change() for utimes(NULL)
2016-10-22 12:26:56 +02:00
xattr.c
getxattr: use correct xattr length
2018-09-09 20:04:36 +02:00