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Nadav Amit 3cda4bfffd userfaultfd: fix a race between writeprotect and exit_mmap() 
commit cb185d5f1e upstream.

A race is possible when a process exits, its VMAs are removed by
exit_mmap() and at the same time userfaultfd_writeprotect() is called.

The race was detected by KASAN on a development kernel, but it appears
to be possible on vanilla kernels as well.

Use mmget_not_zero() to prevent the race as done in other userfaultfd
operations.

Link: https://lkml.kernel.org/r/20210921200247.25749-1-namit@vmware.com
Fixes: 63b2d4174c ("userfaultfd: wp: add the writeprotect API to userfaultfd ioctl")
Signed-off-by: Nadav Amit <namit@vmware.com>
Tested-by: Li  Wang <liwang@redhat.com>
Reviewed-by: Peter Xu <peterx@redhat.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2021-10-27 09:56:51 +02:00
..
9p
new helper: inode_wrong_type()
2021-09-08 08:49:01 +02:00
adfs
…
affs
fs/affs: release old buffer head on error path
2021-03-04 11:38:37 +01:00
afs
afs: Fix updating of i_blocks on file/dir extension
2021-09-30 10:11:01 +02:00
autofs
…
befs
…
bfs
bfs: don't use WARNING: string when it's just info.
2021-01-06 14:56:52 +01:00
btrfs
btrfs: fix abort logic in btrfs_replace_file_extents
2021-10-20 11:44:59 +02:00
cachefiles
fs/cachefiles: Remove wait_bit_key layout dependency
2021-03-30 14:32:07 +02:00
ceph
ceph: fix handling of "meta" errors
2021-10-27 09:56:51 +02:00
cifs
smb3: correct smb3 ACL security descriptor
2021-10-09 14:40:57 +02:00
coda
…
configfs
configfs: fix memleak in configfs_release_bin_file
2021-07-14 16:56:48 +02:00
cramfs
…
crypto
fscrypt: add fscrypt_symlink_getattr() for computing st_size
2021-09-08 08:48:59 +02:00
debugfs
debugfs: debugfs_create_file_size(): use IS_ERR to check for error
2021-10-06 15:55:59 +02:00
devpts
…
dlm
fs: dlm: fix memory leak when fenced
2021-07-14 16:55:59 +02:00
ecryptfs
Revert "ecryptfs: replace BUG_ON with error handling code"
2021-05-26 12:06:55 +02:00
efivarfs
…
efs
…
erofs
erofs: fix error return code in erofs_read_superblock()
2021-07-14 16:56:53 +02:00
exfat
exfat: handle wrong stream entry size in exfat_readdir()
2021-07-14 16:56:52 +02:00
exportfs
…
ext2
ext2: fix sleeping in atomic bugs on error
2021-10-09 14:40:56 +02:00
ext4
ext4: correct the error path of ext4_write_inline_data_end()
2021-10-17 10:43:32 +02:00
f2fs
f2fs: should put a page beyond EOF when preparing a write
2021-09-18 13:40:16 +02:00
fat
…
freevxfs
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fscache
fscache: Fix cookie key hashing
2021-09-18 13:40:15 +02:00
fuse
fuse: fix use after free in fuse_read_interrupt()
2021-09-22 12:28:00 +02:00
gfs2
treewide: Change list_sort to use const pointers
2021-09-30 10:11:04 +02:00
hfs
hfs: add lock nesting notation to hfs_find_init
2021-07-31 08:16:12 +02:00
hfsplus
hfsplus: prevent corruption in shrinking truncate
2021-05-19 10:13:10 +02:00
hostfs
hostfs: fix memory handling in follow_link()
2021-04-14 08:42:06 +02:00
hpfs
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hugetlbfs
hugetlbfs: fix mount mode command line processing
2021-07-28 14:35:46 +02:00
iomap
treewide: Change list_sort to use const pointers
2021-09-30 10:11:04 +02:00
isofs
isofs: joliet: Fix iocharset=utf8 mount option
2021-09-15 09:50:25 +02:00
jbd2
ext4: fix debug format string warning
2021-05-19 10:13:19 +02:00
jffs2
jffs2: check the validity of dstlen in jffs2_zlib_compress()
2021-05-11 14:47:36 +02:00
jfs
fs/jfs: Fix missing error code in lmLogInit()
2021-07-20 16:05:40 +02:00
kernfs
kernfs: wire up ->splice_read and ->splice_write
2021-01-27 11:55:29 +01:00
lockd
lockd: lockd server-side shouldn't set fl_ops
2021-09-18 13:40:30 +02:00
minix
…
nfs
NFSv4/pnfs: The layout barrier indicate a minimal value for the seqid
2021-09-18 13:40:13 +02:00
nfs_common
nfs_common: need lock during iterate through the list
2020-12-30 11:53:45 +01:00
nfsd
NFSD: Keep existing listeners on portlist error
2021-10-27 09:56:47 +02:00
nilfs2
nilfs2: fix memory leak in nilfs_sysfs_delete_snapshot_group
2021-09-26 14:09:01 +02:00
nls
…
notify
fanotify: limit number of event merge attempts
2021-09-18 13:40:38 +02:00
ntfs
ntfs: fix validity check for file name attribute
2021-07-14 16:55:38 +02:00
ocfs2
ocfs2: mount fails with buffer overflow in strlen
2021-10-27 09:56:51 +02:00
omfs
…
openpromfs
…
orangefs
orangefs: fix orangefs df output.
2021-07-20 16:05:48 +02:00
overlayfs
ovl: fix IOCB_DIRECT if underlying fs doesn't support direct IO
2021-10-13 10:04:23 +02:00
proc
proc: Avoid mixing integer types in mem_rw()
2021-07-28 14:35:42 +02:00
pstore
mark pstore-blk as broken
2021-07-14 16:56:12 +02:00
qnx4
qnx4: work around gcc false positive warning bug
2021-09-30 10:11:08 +02:00
qnx6
…
quota
quota: Fix memory leak when handling corrupted quota file
2021-03-04 11:37:53 +01:00
ramfs
…
reiserfs
reiserfs: check directory items on read from disk
2021-08-12 13:22:19 +02:00
romfs
…
squashfs
squashfs: fix divide error in calculate_skip()
2021-05-19 10:13:10 +02:00
sysfs
…
sysv
…
tracefs
…
ubifs
treewide: Change list_sort to use const pointers
2021-09-30 10:11:04 +02:00
udf
udf_get_extendedattr() had no boundary checks.
2021-09-15 09:50:27 +02:00
ufs
…
unicode
…
vboxsf
vboxfs: fix broken legacy mount signature checking
2021-10-17 10:43:33 +02:00
verity
fs-verity: fix signed integer overflow with i_size near S64_MAX
2021-10-06 15:55:46 +02:00
xfs
treewide: Change list_sort to use const pointers
2021-09-30 10:11:04 +02:00
zonefs
zonefs: fix to update .i_wr_refcnt correctly in zonefs_open_zone()
2021-03-25 09:04:05 +01:00
aio.c
…
anon_inodes.c
…
attr.c
…
bad_inode.c
…
binfmt_aout.c
…
binfmt_elf_fdpic.c
…
binfmt_elf.c
elf: don't use MAP_FIXED_NOREPLACE for elf interpreter mappings
2021-10-06 15:55:59 +02:00
binfmt_em86.c
…
binfmt_flat.c
…
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: fix a race between del_gendisk and BLKRRPART
2021-06-03 09:00:45 +02:00
buffer.c
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char_dev.c
…
compat_binfmt_elf.c
…
coredump.c
coredump: fix memleak in dump_vma_snapshot()
2021-09-26 14:08:56 +02:00
d_path.c
…
dax.c
dax: fix ENOMEM handling in grab_mapping_entry()
2021-07-14 16:56:13 +02:00
dcache.c
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dcookies.c
…
direct-io.c
fs: direct-io: fix missing sdio->boundary
2021-04-14 08:41:58 +02:00
drop_caches.c
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eventfd.c
…
eventpoll.c
fs/epoll: restore waking from ep_done_scan()
2021-05-11 14:47:12 +02:00
exec.c
Revert "Add a reference to ucounts for each cred"
2021-09-08 08:49:00 +02:00
fcntl.c
fcntl: fix potential deadlock for &fasync_struct.fa_lock
2021-09-15 09:50:27 +02:00
fhandle.c
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file_table.c
…
file.c
kernel/io_uring: cancel io_uring before task works
2021-01-30 13:55:18 +01:00
filesystems.c
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fs_context.c
…
fs_parser.c
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fs_pin.c
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fs_struct.c
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fs_types.c
…
fs-writeback.c
writeback: fix obtain a reference to a freeing memcg css
2021-07-14 16:56:31 +02:00
fsopen.c
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init.c
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inode.c
fs: Handle I_DONTCACHE in iput_final() instead of generic_drop_inode()
2020-12-30 11:53:49 +01:00
internal.h
cgroup1: fix leaked context root causing sporadic NULL deref in LTP
2021-07-31 08:16:11 +02:00
io_uring.c
io_uring: fix splice_fd_in checks backport typo
2021-10-27 09:56:46 +02:00
io-wq.c
io-wq: fix wakeup race when adding new work
2021-09-18 13:40:06 +02:00
io-wq.h
io_uring: always batch cancel in *cancel_files()
2021-02-13 13:54:56 +01:00
ioctl.c
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Kconfig
tmpfs: disallow CONFIG_TMPFS_INODE64 on alpha
2021-02-17 11:02:21 +01:00
Kconfig.binfmt
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kernel_read_file.c
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libfs.c
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locks.c
Revert "nfsd4: a client's own opens needn't prevent delegations"
2021-03-20 10:43:44 +01:00
Makefile
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mbcache.c
…
mount.h
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mpage.c
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namei.c
LOOKUP_MOUNTPOINT: we are cleaning "jumped" flag too late
2021-04-14 08:41:58 +02:00
namespace.c
fs: warn about impending deprecation of mandatory locks
2021-08-26 08:35:57 -04:00
no-block.c
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nsfs.c
…
open.c
open: don't silently ignore unknown O-flags in openat2()
2021-07-14 16:55:59 +02:00
pipe.c
pipe: do FASYNC notifications for every pipe IO, not just state changes
2021-09-03 10:09:28 +02:00
pnode.c
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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
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proc_namespace.c
proc mountinfo: make splice available again
2020-12-30 11:54:02 +01:00
read_write.c
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readdir.c
readdir: make sure to verify directory entry for legacy interfaces too
2021-04-21 13:00:54 +02:00
remap_range.c
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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
seq_file: disallow extremely large seq buffer allocations
2021-07-20 16:05:59 +02:00
signalfd.c
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splice.c
…
stack.c
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stat.c
fs: fix reporting supported extra file attributes for statx()
2021-05-11 14:47:33 +02:00
statfs.c
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super.c
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sync.c
…
timerfd.c
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userfaultfd.c
userfaultfd: fix a race between writeprotect and exit_mmap()
2021-10-27 09:56:51 +02:00
utimes.c
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xattr.c
…