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linux/fs
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Mike Rapoport (Microsoft) 0496a59745 userfaultfd: ensure mremap_userfaultfd_fail() releases mmap_changing 
Sashiko says:

  mremap_userfaultfd_prep() increments ctx->mmap_changing to stall
  concurrent operations, but mremap_userfaultfd_fail() does not
  decrement it before dropping the context reference.

If an mremap operation fails, ctx->mmap_changing remains elevated. This
will causes subsequent userfaultfd operations like a UFFDIO_COPY to fail
with -EAGAIN.

Decrement ctx->mmap_changing in mremap_userfaultfd_fail().

Link: https://sashiko.dev/#/patchset/20260430113512.115938-1-rppt@kernel.org
Link: https://lore.kernel.org/20260513081416.495963-1-rppt@kernel.org
Fixes: df2cc96e77 ("userfaultfd: prevent non-cooperative events vs mcopy_atomic races")
Signed-off-by: Mike Rapoport (Microsoft) <rppt@kernel.org>
Reviewed-by: David Hildenbrand (Arm) <david@kernel.org>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Christian Brauner <brauner@kernel.org>
Cc: Jan Kara <jack@suse.cz>
Cc: Peter Xu <peterx@redhat.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
2026-06-02 15:22:17 -07:00
..
9p
netfs: Fix potential for tearing in ->remote_i_size and ->zero_point
2026-05-12 14:42:30 +02:00
adfs
Merge tag 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rmk/linux
2026-04-25 07:44:26 -07:00
affs
Merge tag 'pull-dcache-busy-wait' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2026-04-21 07:30:44 -07:00
afs
afs: Fix the locking used by afs_get_link()
2026-05-12 14:42:33 +02:00
autofs
Merge tag 'vfs-7.1-rc1.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs
2026-04-13 14:20:11 -07:00
befs
treewide: change inode->i_ino from unsigned long to u64
2026-03-06 14:31:28 +01:00
bfs
Merge tag 'vfs-7.1-rc1.bh.metadata' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs
2026-04-13 12:46:42 -07:00
btrfs
Merge tag 'for-7.1-rc4-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux
2026-05-23 16:54:48 -07:00
cachefiles
cachefiles: Fix error return when vfs_mkdir() fails
2026-05-15 15:32:43 +02:00
ceph
ceph: put folios not suitable for writeback
2026-05-11 10:39:22 +02:00
coda
Merge tag 'pull-coda' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2026-04-21 14:03:10 -07:00
configfs
Convert 'alloc_obj' family to use the new default GFP_KERNEL argument
2026-02-21 17:09:51 -08:00
cramfs
treewide: change inode->i_ino from unsigned long to u64
2026-03-06 14:31:28 +01:00
crypto
Merge tag 'fscrypt-for-linus' of git://git.kernel.org/pub/scm/fs/fscrypt/linux
2026-04-13 17:29:12 -07:00
debugfs
debugfs: fix placement of EXPORT_SYMBOL_GPL for debugfs_create_str()
2026-04-02 16:15:23 +02:00
devpts
Convert 'alloc_obj' family to use the new default GFP_KERNEL argument
2026-02-21 17:09:51 -08:00
dlm
ipv6: convert CONFIG_IPV6 to built-in only and clean up Kconfigs
2026-03-29 11:21:22 -07:00
ecryptfs
Merge tag 'ecryptfs-7.1-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tyhicks/ecryptfs
2026-04-20 10:54:17 -07:00
efivarfs
efivarfs: use QSTR() in efivarfs_alloc_dentry
2026-04-28 12:30:59 +02:00
efs
treewide: change inode->i_ino from unsigned long to u64
2026-03-06 14:31:28 +01:00
erofs
erofs: fix metabuf leak in inode xattr initialization
2026-05-20 14:53:14 +08:00
exfat
Merge tag 'exfat-for-7.1-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/linkinjeon/exfat
2026-04-13 16:57:31 -07:00
exportfs
Merge tag 'pull-dcache-busy-wait' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2026-04-21 07:30:44 -07:00
ext2
Merge tag 'fs_for_v7.1-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs
2026-04-15 19:22:16 -07:00
ext4
Merge tag 'ext4_for_linux-7.0-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4
2026-04-17 17:08:31 -07:00
f2fs
Merge tag 'f2fs-for-7.1-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/jaegeuk/f2fs
2026-04-21 14:50:04 -07:00
fat
Merge tag 'vfs-7.1-rc1.bh.metadata' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs
2026-04-13 12:46:42 -07:00
freevxfs
treewide: change inode->i_ino from unsigned long to u64
2026-03-06 14:31:28 +01:00
fuse
fuse: fix writeback array overflow when max_pages is one
2026-05-11 14:19:01 +02:00
gfs2
Merge tag 'gfs2-for-7.1' of git://git.kernel.org/pub/scm/linux/kernel/git/gfs2/linux-gfs2
2026-04-15 19:12:04 -07:00
hfs
Merge tag 'vfs-7.1-rc1.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs
2026-04-13 14:20:11 -07:00
hfsplus
Merge tag 'hfs-v7.1-tag1' of git://git.kernel.org/pub/scm/linux/kernel/git/vdubeyko/hfs
2026-04-13 16:50:38 -07:00
hostfs
Convert 'alloc_obj' family to use the new default GFP_KERNEL argument
2026-02-21 17:09:51 -08:00
hpfs
hpfs: fix a crash if hpfs_map_dnode_bitmap fails
2026-05-25 14:48:58 +02:00
hugetlbfs
Revert "mm/hugetlbfs: update hugetlbfs to use mmap_prepare"
2026-05-21 19:06:11 -07:00
iomap
block: pass a minsize argument to bio_iov_iter_bounce
2026-05-13 13:55:06 -06:00
isofs
isofs: use QSTR_LEN() in isofs_cmp
2026-04-20 17:27:28 +02:00
jbd2
Merge tag 'ext4_for_linux-7.0-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4
2026-04-17 17:08:31 -07:00
jffs2
treewide: change inode->i_ino from unsigned long to u64
2026-03-06 14:31:28 +01:00
jfs
fs: Fix return in jfs_mkdir and orangefs_mkdir
2026-05-11 14:19:01 +02:00
kernfs
Merge tag 'driver-core-7.1-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/driver-core/driver-core
2026-04-13 19:03:11 -07:00
lockd
Merge tag 'nfsd-7.1' of git://git.kernel.org/pub/scm/linux/kernel/git/cel/linux
2026-04-20 10:44:02 -07:00
minix
Merge tag 'vfs-7.1-rc1.bh.metadata' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs
2026-04-13 12:46:42 -07:00
netfs
netfs, afs: Fix write skipping in dir/link writepages
2026-05-12 14:42:32 +02:00
nfs
Merge tag 'nfs-for-7.1-1' of git://git.linux-nfs.org/projects/trondmy/linux-nfs
2026-04-24 14:20:03 -07:00
nfs_common
NFSD: Remove NFSERR_EAGAIN
2026-01-02 13:43:41 -05:00
nfsd
Merge tag 'nfsd-7.1-1' of git://git.kernel.org/pub/scm/linux/kernel/git/cel/linux
2026-05-15 13:11:41 -07:00
nilfs2
Merge tag 'mm-stable-2026-04-13-21-45' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
2026-04-15 12:59:16 -07:00
nls
fs/nls: Fix inconsistency between utf8_to_utf32() and utf32_to_utf8()
2025-12-01 11:58:06 +02:00
notify
Merge tag 'fsnotify_for_v7.1-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs
2026-04-27 16:40:24 -07:00
ntfs
ntfs: restore $MFT mirror contents check
2026-05-11 23:30:48 +09:00
ntfs3
Merge tag 'ntfs3_for_7.1' of https://github.com/Paragon-Software-Group/linux-ntfs3
2026-04-20 10:59:47 -07:00
ocfs2
Merge tag 'pull-dcache-busy-wait' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2026-04-21 07:30:44 -07:00
omfs
Merge tag 'vfs-7.1-rc1.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs
2026-04-13 14:20:11 -07:00
openpromfs
…
orangefs
fs: Fix return in jfs_mkdir and orangefs_mkdir
2026-05-11 14:19:01 +02:00
overlayfs
ovl: fix verity lazy-load guard broken by fsverity_active() semantic change
2026-05-06 08:37:30 -07:00
proc
Merge tag 'mm-nonmm-stable-2026-04-15-04-20' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
2026-04-16 20:11:56 -07:00
pstore
Merge tag 'mm-stable-2026-04-13-21-45' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
2026-04-15 12:59:16 -07:00
qnx4
Merge tag 'vfs-7.1-rc1.bh.metadata' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs
2026-04-13 12:46:42 -07:00
qnx6
Merge tag 'vfs-7.1-rc1.bh.metadata' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs
2026-04-13 12:46:42 -07:00
quota
quota: Fix race of dquot_scan_active() with quota deactivation
2026-03-25 13:15:36 +01:00
ramfs
folio_batch: rename pagevec.h to folio_batch.h
2026-04-05 13:53:07 -07:00
resctrl
Merge tag 'mm-stable-2026-04-13-21-45' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
2026-04-15 12:59:16 -07:00
romfs
Merge tag 'mm-stable-2026-02-18-19-48' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
2026-02-18 20:50:32 -08:00
smb
Merge tag 'v7.1-rc5-ksmbd-server-fixes' of git://git.samba.org/ksmbd
2026-05-23 16:59:02 -07:00
squashfs
Squashfs: check metadata block offset is within range
2026-02-24 11:13:27 -08:00
sysfs
sysfs: don't remove existing directory on update failure
2026-05-20 17:13:20 +02:00
tests
fs/tests: exec: Remove bad test vector
2026-03-18 11:41:53 -07:00
tracefs
Merge tag 'tracefs-v7.1-2' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace
2026-04-22 15:09:01 -07:00
ubifs
Merge tag 'mm-nonmm-stable-2026-04-15-04-20' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
2026-04-16 20:11:56 -07:00
udf
udf: reject descriptors with oversized CRC length
2026-04-22 17:14:48 +02:00
ufs
Merge tag 'vfs-7.1-rc1.bh.metadata' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs
2026-04-13 12:46:42 -07:00
unicode
Convert 'alloc_obj' family to use the new default GFP_KERNEL argument
2026-02-21 17:09:51 -08:00
vboxsf
Convert 'alloc_obj' family to use the new default GFP_KERNEL argument
2026-02-21 17:09:51 -08:00
verity
Merge tag 'vfs-7.1-rc1.kino' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs
2026-04-13 12:19:01 -07:00
xfs
xfs: fix a buffer lookup against removal race
2026-05-21 13:43:58 +02:00
zonefs
zonefs: handle integer overflow in zonefs_fname_to_fno
2026-05-12 07:53:20 +09:00
aio.c
fs: aio: reject partial mremap to avoid Null-pointer-dereference error
2026-04-24 00:34:59 +02:00
anon_inodes.c
anon_inodes: convert to FD_ADD()
2025-11-28 12:42:31 +01:00
attr.c
fs: attr: fix comment formatting and spelling issues
2026-04-07 11:26:11 +02:00
backing-file.c
lsm: add backing_file LSM hooks
2026-04-03 16:53:50 -04:00
bad_inode.c
fs: refactor ->update_time handling
2026-01-12 14:01:32 +01:00
binfmt_elf_fdpic.c
Merge tag 'vfs-7.1-rc1.kino' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs
2026-04-13 12:19:01 -07:00
binfmt_elf.c
mm: unexport vm_brk_flags() and eliminate vm_flags parameter
2026-04-05 13:53:39 -07:00
binfmt_flat.c
…
binfmt_misc.c
Convert 'alloc_obj' family to use the new default GFP_KERNEL argument
2026-02-21 17:09:51 -08:00
binfmt_script.c
…
bpf_fs_kfuncs.c
bpf: Remove redundant KF_TRUSTED_ARGS flag from all kfuncs
2026-01-02 12:04:28 -08:00
buffer.c
Merge tag 'vfs-7.1-rc1.fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs
2026-04-23 17:08:04 -07:00
char_dev.c
Convert 'alloc_obj' family to use the new default GFP_KERNEL argument
2026-02-21 17:09:51 -08:00
compat_binfmt_elf.c
…
coredump.c
Merge tag 'vfs-7.1-rc1.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs
2026-04-13 14:20:11 -07:00
d_path.c
dcache: permit dynamic_dname()s up to NAME_MAX
2026-04-07 12:32:22 +02:00
dax.c
Merge tag 'libnvdimm-for-7.1' of git://git.kernel.org/pub/scm/linux/kernel/git/nvdimm/nvdimm
2026-04-21 14:12:01 -07:00
dcache.c
Merge tag 'pull-dcache-busy-wait' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2026-04-21 07:30:44 -07:00
direct-io.c
…
drop_caches.c
…
eventfd.c
Convert 'alloc_obj' family to use the new default GFP_KERNEL argument
2026-02-21 17:09:51 -08:00
eventpoll.c
eventpoll: drop vestigial epi->dying flag
2026-04-24 00:37:01 +02:00
exec.c
exec: use strnlen() in __set_task_comm
2026-04-01 12:26:07 -07:00
fcntl.c
Convert 'alloc_obj' family to use the new default GFP_KERNEL argument
2026-02-21 17:09:51 -08:00
fhandle.c
Convert more 'alloc_obj' cases to default GFP_KERNEL arguments
2026-02-21 20:03:00 -08:00
file_attr.c
Merge tag 'vfs-7.0-rc2.fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs
2026-02-25 10:34:23 -08:00
file_table.c
Merge tag 'lsm-pr-20260410' of git://git.kernel.org/pub/scm/linux/kernel/git/pcmoore/lsm
2026-04-13 15:17:28 -07:00
file.c
Merge tag 'vfs-7.1-rc1.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs
2026-04-13 14:20:11 -07:00
filesystems.c
sysfs(2): fs_index() argument is _not_ a pathname
2026-01-16 12:52:04 -05:00
fs_context.c
Merge tag 'vfs-7.1-rc1.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs
2026-04-13 14:20:11 -07:00
fs_dirent.c
…
fs_parser.c
fs: remove fsparam_path / fs_param_is_path
2026-02-19 14:34:26 +01:00
fs_pin.c
…
fs_struct.c
fs: add <linux/init_task.h> for 'init_fs'
2026-01-14 16:50:37 +01:00
fs-writeback.c
Merge tag 'vfs-7.1-rc1.fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs
2026-04-23 17:08:04 -07:00
fserror.c
treewide: change inode->i_ino from unsigned long to u64
2026-03-06 14:31:28 +01:00
fsopen.c
Convert 'alloc_obj' family to use the new default GFP_KERNEL argument
2026-02-21 17:09:51 -08:00
init.c
Merge tag 'pull-filename' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2026-02-09 16:58:28 -08:00
inode.c
fs: fix forced iversion increment on lazytime timestamp updates
2026-05-11 15:32:12 +02:00
internal.h
Merge tag 'lsm-pr-20260410' of git://git.kernel.org/pub/scm/linux/kernel/git/pcmoore/lsm
2026-04-13 15:17:28 -07:00
ioctl.c
…
Kconfig
ntfs: add Kconfig and Makefile
2026-02-19 21:51:00 +09:00
Kconfig.binfmt
…
kernel_read_file.c
…
libfs.c
Merge tag 'vfs-7.1-rc1.bh.metadata' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs
2026-04-13 12:46:42 -07:00
locks.c
Merge tag 'nfsd-7.1' of git://git.kernel.org/pub/scm/linux/kernel/git/cel/linux
2026-04-20 10:44:02 -07:00
Makefile
ntfs: add Kconfig and Makefile
2026-02-19 21:51:00 +09:00
mbcache.c
Merge tag 'vfs-7.1-rc1.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs
2026-04-13 14:20:11 -07:00
mnt_idmapping.c
fs/statmount: fix slab out-of-bounds write in statmount_mnt_idmap
2026-05-11 14:19:01 +02:00
mount.h
fs: add immutable rootfs
2026-01-12 16:52:09 +01:00
mpage.c
Merge tag 'mm-stable-2026-04-13-21-45' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
2026-04-15 12:59:16 -07:00
namei.c
Merge tag 'vfs-7.1-rc1.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs
2026-04-13 14:20:11 -07:00
namespace.c
mount: always duplicate mount
2026-04-14 09:30:15 +02:00
nsfs.c
nsfs: fix wrong error code returned for pidns ioctls
2026-05-11 15:59:14 +02:00
nullfs.c
fs: add immutable rootfs
2026-01-12 16:52:09 +01:00
open.c
fs: remove do_sys_truncate
2026-03-23 12:41:58 +01:00
pidfs.c
Merge tag 'vfs-7.1-rc1.pidfs' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs
2026-04-13 13:27:11 -07:00
pipe.c
treewide: change inode->i_ino from unsigned long to u64
2026-03-06 14:31:28 +01:00
pnode.c
…
pnode.h
…
posix_acl.c
treewide: Replace kmalloc with kmalloc_obj for non-scalar types
2026-02-21 01:02:28 -08:00
proc_namespace.c
…
read_write.c
fs: add setlease to generic_ro_fops and read-only filesystem directory operations
2026-01-12 10:55:45 +01:00
readdir.c
fs: Replace user_access_{begin/end} by scoped user access
2026-03-24 14:44:02 +01:00
remap_range.c
…
select.c
fs/select: reject negative timeval components in kern_select()
2026-05-12 14:41:40 +02:00
seq_file.c
treewide: Replace kmalloc with kmalloc_obj for non-scalar types
2026-02-21 01:02:28 -08:00
signalfd.c
Convert 'alloc_obj' family to use the new default GFP_KERNEL argument
2026-02-21 17:09:51 -08:00
splice.c
Convert 'alloc_obj' family to use the new default GFP_KERNEL argument
2026-02-21 17:09:51 -08:00
stack.c
…
stat.c
statx: switch to CLASS(filename_maybe_null)
2026-01-16 12:52:04 -05:00
statfs.c
user_statfs(): switch to CLASS(filename)
2026-01-16 12:52:04 -05:00
super.c
Convert 'alloc_obj' family to use the new default GFP_KERNEL argument
2026-02-21 17:09:51 -08:00
sync.c
treewide: Replace kmalloc with kmalloc_obj for non-scalar types
2026-02-21 01:02:28 -08:00
sysctls.c
…
timerfd.c
Convert 'alloc_obj' family to use the new default GFP_KERNEL argument
2026-02-21 17:09:51 -08:00
userfaultfd.c
userfaultfd: ensure mremap_userfaultfd_fail() releases mmap_changing
2026-06-02 15:22:17 -07:00
utimes.c
do_utimes_path(): switch to CLASS(filename_uflags)
2026-01-16 12:52:03 -05:00
xattr.c
xattr: support extended attributes on sockets
2026-03-02 11:06:42 +01:00