Theodore Ts'o b07625698e BACKPORT: ext4: don't BUG if someone dirty pages without asking ext4 first ... [ Upstream commit cc5095747e ] [un]pin_user_pages_remote is dirtying pages without properly warning the file system in advance. A related race was noted by Jan Kara in 2018[1]; however, more recently instead of it being a very hard-to-hit race, it could be reliably triggered by process_vm_writev(2) which was discovered by Syzbot[2]. This is technically a bug in mm/gup.c, but arguably ext4 is fragile in that if some other kernel subsystem dirty pages without properly notifying the file system using page_mkwrite(), ext4 will BUG, while other file systems will not BUG (although data will still be lost). So instead of crashing with a BUG, issue a warning (since there may be potential data loss) and just mark the page as clean to avoid unprivileged denial of service attacks until the problem can be properly fixed. More discussion and background can be found in the thread starting at [2]. [1] https://lore.kernel.org/linux-mm/20180103100430.GE4911@quack2.suse.cz [2] https://lore.kernel.org/r/Yg0m6IjcNmfaSokM@google.com Reported-by: syzbot+d59332e2db681cf18f0318a06e994ebbb529a8db@syzkaller.appspotmail.com Reported-by: Lee Jones <lee.jones@linaro.org> Signed-off-by: Theodore Ts'o <tytso@mit.edu> Link: https://lore.kernel.org/r/YiDS9wVfq4mM2jGK@mit.edu Signed-off-by: Sasha Levin <sashal@kernel.org> Signed-off-by: Lee Jones <lee.jones@linaro.org> Change-Id: I974915cfe58a2f773b025db8864f4b7927de2153		2022-04-21 07:53:59 +00:00
..
9p	This is the 5.10.93 stable release	2022-01-20 09:34:45 +01:00
adfs	ANDROID: GKI: set vfs-only exports into their own namespace	2022-01-11 09:30:47 +01:00
affs	ANDROID: GKI: set vfs-only exports into their own namespace	2022-01-11 09:30:47 +01:00
afs	Merge tag 'android12-5.10.81_r00' into android12-5.10	2022-01-21 09:35:04 +01:00
autofs	ANDROID: GKI: set vfs-only exports into their own namespace	2022-01-11 09:30:47 +01:00
befs	ANDROID: GKI: set vfs-only exports into their own namespace	2022-01-11 09:30:47 +01:00
bfs	ANDROID: GKI: set vfs-only exports into their own namespace	2022-01-11 09:30:47 +01:00
btrfs	This is the 5.10.99 stable release	2022-02-09 12:14:04 +01:00
cachefiles	ANDROID: GKI: set vfs-only exports into their own namespace	2022-01-11 09:30:47 +01:00
ceph	This is the 5.10.96 stable release	2022-02-07 11:17:58 +01:00
cifs	Merge tag 'android12-5.10.81_r00' into android12-5.10	2022-01-21 09:35:04 +01:00
coda	ANDROID: GKI: set vfs-only exports into their own namespace	2022-01-11 09:30:47 +01:00
configfs	This is the 5.10.96 stable release	2022-02-07 11:17:58 +01:00
cramfs	ANDROID: GKI: set vfs-only exports into their own namespace	2022-01-11 09:30:47 +01:00
crypto	ANDROID: GKI: set more vfs-only exports into their own namespace	2022-04-07 20:52:29 +02:00
debugfs	debugfs: lockdown: Allow reading debugfs files that are not world readable	2022-01-27 10:54:02 +01:00
devpts	fsnotify: fix fsnotify hooks in pseudo filesystems	2022-02-01 17:25:39 +01:00
dlm	fs: dlm: filter user dlm messages for kernel locks	2022-01-27 10:54:10 +01:00
ecryptfs	ANDROID: GKI: set vfs-only exports into their own namespace	2022-01-11 09:30:47 +01:00
efivarfs	ANDROID: GKI: set vfs-only exports into their own namespace	2022-01-11 09:30:47 +01:00
efs	ANDROID: GKI: set vfs-only exports into their own namespace	2022-01-11 09:30:47 +01:00
erofs	Merge tag 'android12-5.10.81_r00' into android12-5.10	2022-01-21 09:35:04 +01:00
exfat	Merge tag 'android12-5.10.81_r00' into android12-5.10	2022-01-21 09:35:04 +01:00
exportfs
ext2	Merge tag 'android12-5.10.81_r00' into android12-5.10	2022-01-21 09:35:04 +01:00
ext4	BACKPORT: ext4: don't BUG if someone dirty pages without asking ext4 first	2022-04-21 07:53:59 +00:00
f2fs	Merge tag 'android12-5.10.101_r00' into android12-5.10	2022-03-21 14:29:02 +01:00
fat	ANDROID: GKI: set vfs-only exports into their own namespace	2022-01-11 09:30:47 +01:00
freevxfs	ANDROID: GKI: set vfs-only exports into their own namespace	2022-01-11 09:30:47 +01:00
fscache	ANDROID: GKI: set more vfs-only exports into their own namespace	2022-04-07 20:52:29 +02:00
fuse	This is the 5.10.94 stable release	2022-01-27 11:49:22 +01:00
gfs2	Merge tag 'android12-5.10.81_r00' into android12-5.10	2022-01-21 09:35:04 +01:00
hfs	ANDROID: GKI: set vfs-only exports into their own namespace	2022-01-11 09:30:47 +01:00
hfsplus	ANDROID: GKI: set vfs-only exports into their own namespace	2022-01-11 09:30:47 +01:00
hostfs	hostfs: fix memory handling in follow_link()	2021-04-14 08:42:06 +02:00
hpfs	ANDROID: GKI: set vfs-only exports into their own namespace	2022-01-11 09:30:47 +01:00
hugetlbfs	hugetlbfs: fix mount mode command line processing	2021-07-28 14:35:46 +02:00
incfs	ANDROID: incremental-fs: limit mount stack depth	2022-04-06 17:24:59 +00:00
iomap	Revert "treewide: Change list_sort to use const pointers"	2021-10-04 11:07:40 +02:00
isofs	Merge tag 'android12-5.10.81_r00' into android12-5.10	2022-01-21 09:35:04 +01:00
jbd2	ANDROID: GKI: set more vfs-only exports into their own namespace	2022-04-07 20:52:29 +02:00
jffs2	This is the 5.10.94 stable release	2022-01-27 11:49:22 +01:00
jfs	Merge tag 'android12-5.10.81_r00' into android12-5.10	2022-01-21 09:35:04 +01:00
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	ANDROID: GKI: set vfs-only exports into their own namespace	2022-01-11 09:30:47 +01:00
nfs	This is the 5.10.101 stable release	2022-02-16 15:16:06 +01:00
nfs_common
nfsd	This is the 5.10.101 stable release	2022-02-16 15:16:06 +01:00
nilfs2	Merge tag 'android12-5.10.81_r00' into android12-5.10	2022-01-21 09:35:04 +01:00
nls	ANDROID: GKI: set vfs-only exports into their own namespace	2022-01-11 09:30:47 +01:00
notify	This is the 5.10.97 stable release	2022-02-08 10:08:24 +01:00
ntfs	ANDROID: GKI: set vfs-only exports into their own namespace	2022-01-11 09:30:47 +01:00
ocfs2	This is the 5.10.96 stable release	2022-02-07 11:17:58 +01:00
omfs	ANDROID: GKI: set vfs-only exports into their own namespace	2022-01-11 09:30:47 +01:00
openpromfs
orangefs	Merge tag 'android12-5.10.81_r00' into android12-5.10	2022-01-21 09:35:04 +01:00
overlayfs	Merge tag 'android12-5.10.81_r00' into android12-5.10	2022-01-21 09:35:04 +01:00
proc	This is the 5.10.83 stable release	2021-12-03 15:52:39 +01:00
pstore	Merge branch 'android12-5.10' into android12-5.10-lts	2021-07-22 13:32:27 +02:00
qnx4	Merge tag 'android12-5.10.81_r00' into android12-5.10	2022-01-21 09:35:04 +01:00
qnx6	ANDROID: GKI: set vfs-only exports into their own namespace	2022-01-11 09:30:47 +01:00
quota	quota: correct error number in free_dqentry()	2021-11-18 14:03:51 +01:00
ramfs
reiserfs	ANDROID: GKI: set vfs-only exports into their own namespace	2022-01-11 09:30:47 +01:00
romfs	ANDROID: GKI: set vfs-only exports into their own namespace	2022-01-11 09:30:47 +01:00
squashfs	ANDROID: GKI: set vfs-only exports into their own namespace	2022-01-11 09:30:47 +01:00
sysfs
sysv	ANDROID: GKI: set vfs-only exports into their own namespace	2022-01-11 09:30:47 +01:00
tracefs	Revert "UPSTREAM: tracefs: Have tracefs directories not set OTH permission bits by default"	2022-02-08 12:46:41 -08:00
ubifs	This is the 5.10.94 stable release	2022-01-27 11:49:22 +01:00
udf	This is the 5.10.96 stable release	2022-02-07 11:17:58 +01:00
ufs	ANDROID: GKI: set vfs-only exports into their own namespace	2022-01-11 09:30:47 +01:00
unicode
vboxsf	Merge tag 'android12-5.10.81_r00' into android12-5.10	2022-01-21 09:35:04 +01:00
verity	ANDROID: GKI: set more vfs-only exports into their own namespace	2022-04-07 20:52:29 +02:00
xfs	Merge branch 'android12-5.10' into android12-5.10-lts	2022-01-17 18:47:02 +01:00
zonefs	Merge branch 'android12-5.10' into android12-5.10-lts	2022-01-17 18:47:02 +01:00
aio.c	UPSTREAM: aio: fix use-after-free due to missing POLLFREE handling	2021-12-14 13:54:22 +01:00
anon_inodes.c	UPSTREAM: fs: anon_inodes: rephrase to appropriate kernel-doc	2021-03-03 16:18:33 +00:00
attr.c	ANDROID: GKI: set vfs-only exports into their own namespace	2022-01-11 09:30:47 +01:00
bad_inode.c	ANDROID: GKI: set vfs-only exports into their own namespace	2022-01-11 09:30:47 +01:00
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	ANDROID: GKI: set vfs-only exports into their own namespace	2022-01-11 09:30:47 +01:00
binfmt_script.c
block_dev.c	ANDROID: GKI: set vfs-only exports into their own namespace	2022-01-11 09:30:47 +01:00
buffer.c	ANDROID: GKI: remove vfs-only namespace from 2 symbols	2022-03-08 07:19:02 +00:00
char_dev.c
compat_binfmt_elf.c
coredump.c	This is the 5.10.69 stable release	2021-09-30 18:36:17 +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	ANDROID: GKI: set vfs-only exports into their own namespace	2022-01-11 09:30:47 +01:00
dcookies.c
direct-io.c	ANDROID: GKI: set vfs-only exports into their own namespace	2022-01-11 09:30:47 +01:00
drop_caches.c
eventfd.c
eventpoll.c	Merge 5.10.36 into android12-5.10	2021-05-13 14:22:11 +02:00
exec.c	Revert "ANDROID: vendor_hooks: Add a hook for task tagging"	2022-01-21 13:11:10 +01:00
fcntl.c	fcntl: fix potential deadlock for &fasync_struct.fa_lock	2021-09-15 09:50:27 +02:00
fhandle.c
file_table.c
file.c	UPSTREAM: fget: check that the fd still exists after getting a ref to it	2022-03-01 16:51:28 +00:00
filesystems.c
fs_context.c	memcg: charge fs_context and legacy_fs_context	2022-02-08 18:30:36 +01:00
fs_parser.c
fs_pin.c
fs_struct.c
fs_types.c	ANDROID: GKI: set more vfs-only exports into their own namespace	2022-04-07 20:52:29 +02:00
fs-writeback.c	ANDROID: GKI: set vfs-only exports into their own namespace	2022-01-11 09:30:47 +01:00
fsopen.c
init.c
inode.c	Merge branch 'android12-5.10' into android12-5.10-lts	2022-01-17 18:47:02 +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	UPSTREAM: io_uring: return back safer resurrect	2022-03-23 16:16:56 +00:00
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	ANDROID: GKI: set vfs-only exports into their own namespace	2022-01-11 09:30:47 +01:00
Kconfig	Merge 5.10.17 into android12-5.10	2021-02-18 11:21:01 +01:00
Kconfig.binfmt
kernel_read_file.c	vfs: check fd has read access in kernel_read_file_from_fd()	2021-10-27 09:56:51 +02:00
libfs.c	ANDROID: GKI: set vfs-only exports into their own namespace	2022-01-11 09:30:47 +01:00
locks.c	Revert "nfsd4: a client's own opens needn't prevent delegations"	2021-03-20 10:43:44 +01:00
Makefile	ANDROID: GKI: set vfs-only exports into their own namespace	2022-01-11 09:30:47 +01:00
mbcache.c
mount.h
mpage.c	ANDROID: GKI: set vfs-only exports into their own namespace	2022-01-11 09:30:47 +01:00
namei.c	Merge tag 'android12-5.10.101_r00' into android12-5.10	2022-03-21 14:29:02 +01:00
namespace.c	ANDROID: GKI: set vfs-only exports into their own namespace	2022-01-11 09:30:47 +01:00
no-block.c
nsfs.c
open.c	ANDROID: GKI: set vfs-only exports into their own namespace	2022-01-11 09:30:47 +01:00
pipe.c	Revert "pipe: avoid unnecessary EPOLLET wakeups under normal loads"	2021-09-06 14:28:23 +02:00
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
read_write.c	ANDROID: GKI: set vfs-only exports into their own namespace	2022-01-11 09:30:47 +01:00
readdir.c	readdir: make sure to verify directory entry for legacy interfaces too	2021-04-21 13:00:54 +02:00
remap_range.c
select.c	select: Fix indefinitely sleeping task in poll_schedule_timeout()	2022-01-29 10:26:11 +01:00
seq_file.c	seq_file: disallow extremely large seq buffer allocations	2021-07-20 16:05:59 +02:00
signalfd.c	UPSTREAM: signalfd: use wake_up_pollfree()	2021-12-14 13:54:22 +01:00
splice.c	ANDROID: GKI: set vfs-only exports into their own namespace	2022-01-11 09:30:47 +01:00
stack.c
stat.c	ANDROID: GKI: set vfs-only exports into their own namespace	2022-01-11 09:30:47 +01:00
statfs.c
super.c	This is the 5.10.93 stable release	2022-01-20 09:34:45 +01:00
sync.c	ANDROID: GKI: set vfs-only exports into their own namespace	2022-01-11 09:30:47 +01:00
timerfd.c	ANDROID: fs: Add vendor hooks for ep_create_wakeup_source & timerfd_create	2021-03-24 17:57:22 +00:00
userfaultfd.c	Merge branch 'android12-5.10' into android12-5.10-lts	2021-11-04 17:26:58 +01:00
utimes.c
xattr.c	ANDROID: GKI: set vfs-only exports into their own namespace	2022-01-11 09:30:47 +01:00