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Lukas Czerner 7aa7a7eea3 ext4: fix data corruption caused by unaligned direct AIO 
commit 372a03e01853f860560eade508794dd274e9b390 upstream.

Ext4 needs to serialize unaligned direct AIO because the zeroing of
partial blocks of two competing unaligned AIOs can result in data
corruption.

However it decides not to serialize if the potentially unaligned aio is
past i_size with the rationale that no pending writes are possible past
i_size. Unfortunately if the i_size is not block aligned and the second
unaligned write lands past i_size, but still into the same block, it has
the potential of corrupting the previous unaligned write to the same
block.

This is (very simplified) reproducer from Frank

    // 41472 = (10 * 4096) + 512
    // 37376 = 41472 - 4096

    ftruncate(fd, 41472);
    io_prep_pwrite(iocbs[0], fd, buf[0], 4096, 37376);
    io_prep_pwrite(iocbs[1], fd, buf[1], 4096, 41472);

    io_submit(io_ctx, 1, &iocbs[1]);
    io_submit(io_ctx, 1, &iocbs[2]);

    io_getevents(io_ctx, 2, 2, events, NULL);

Without this patch the 512B range from 40960 up to the start of the
second unaligned write (41472) is going to be zeroed overwriting the data
written by the first write. This is a data corruption.

00000000  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00
*
00009200  30 30 30 30 30 30 30 30  30 30 30 30 30 30 30 30
*
0000a000  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00
*
0000a200  31 31 31 31 31 31 31 31  31 31 31 31 31 31 31 31

With this patch the data corruption is avoided because we will recognize
the unaligned_aio and wait for the unwritten extent conversion.

00000000  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00
*
00009200  30 30 30 30 30 30 30 30  30 30 30 30 30 30 30 30
*
0000a200  31 31 31 31 31 31 31 31  31 31 31 31 31 31 31 31
*
0000b200

Reported-by: Frank Sorenson <fsorenso@redhat.com>
Signed-off-by: Lukas Czerner <lczerner@redhat.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Fixes: e9e3bcecf4 ("ext4: serialize unaligned asynchronous DIO")
Cc: stable@vger.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-07-27 22:08:54 +02:00
..
9p Merge tag 'LA.BR.1.3.6-03910-8976.0' of https://source.codeaurora.org/quic/la/kernel/msm-3.10 into HEAD 2017-05-26 13:28:48 +02:00
adfs fs: push sync_filesystem() down to the file system's remount_fs() 2015-09-16 18:20:11 +05:30
affs This is the 3.10.84 stable release 2015-09-30 13:25:40 +05:30
afs
autofs4 move d_rcu from overlapping d_child to overlapping d_alias 2015-04-29 10:34:00 +02:00
befs fs: push sync_filesystem() down to the file system's remount_fs() 2015-09-16 18:20:11 +05:30
bfs
btrfs Merge tag 'LA.BR.1.3.6-03910-8976.0' of https://source.codeaurora.org/quic/la/kernel/msm-3.10 into HEAD 2017-05-26 13:28:48 +02:00
cachefiles cachefiles: fix the race between cachefiles_bury_object() and rmdir(2) 2019-07-27 21:52:39 +02:00
ceph move d_rcu from overlapping d_child to overlapping d_alias 2015-04-29 10:34:00 +02:00
cifs This is the 3.10.102 stable release 2017-04-18 17:22:08 +02:00
coda This is the 3.10.84 stable release 2015-09-30 13:25:40 +05:30
configfs configfs: fix race between dentry put and lookup 2013-11-29 11:11:53 -08:00
cramfs fs: push sync_filesystem() down to the file system's remount_fs() 2015-09-16 18:20:11 +05:30
crypto fscrypt: remove broken support for detecting keyring key revocation 2019-07-27 21:51:53 +02:00
debugfs BACKPORT: dentry name snapshots 2017-12-22 20:25:56 +00:00
devpts This is the 3.10.98 stable release 2017-04-18 17:17:24 +02:00
dlm
ecryptfs eCryptfs: use after free in ecryptfs_release_messaging() 2019-07-27 21:51:50 +02:00
efivarfs efi: Make efivarfs entries immutable by default 2016-03-16 08:41:37 -07:00
efs fs: push sync_filesystem() down to the file system's remount_fs() 2015-09-16 18:20:11 +05:30
exfat Import latest Samsung release 2017-04-18 03:43:52 +02:00
exofs ore: Fix wrong math in allocation of per device BIO 2014-02-13 13:48:00 -08:00
exportfs This is the 3.10.84 stable release 2015-09-30 13:25:40 +05:30
ext2 it's still short a few helpers, but infrastructure should be OK now... 2018-12-03 11:52:03 +01:00
ext3 posix_acl: Clear SGID bit when setting file permissions 2019-07-27 21:42:52 +02:00
ext4 ext4: fix data corruption caused by unaligned direct AIO 2019-07-27 22:08:54 +02:00
f2fs f2fs: move dir data flush to write checkpoint process 2019-07-27 22:06:03 +02:00
fat fs/fat/fatent.c: add cond_resched() to fat_count_free_clusters() 2019-07-27 21:52:38 +02:00
freevxfs fs: push sync_filesystem() down to the file system's remount_fs() 2015-09-16 18:20:11 +05:30
fscache FS-Cache: fix dereference of NULL user_key_payload 2019-07-27 21:44:20 +02:00
fuse fuse: handle zero sized retrieve correctly 2019-07-27 22:06:05 +02:00
gfs2 posix_acl: Clear SGID bit when setting file permissions 2019-07-27 21:42:52 +02:00
hfs Merge remote-tracking branch 'f2fs/linux-3.10.y' into HEAD 2017-04-18 17:02:28 +02:00
hfsplus Merge remote-tracking branch 'f2fs/linux-3.10.y' into HEAD 2017-04-18 17:02:28 +02:00
hostfs uml: fix hostfs mknod() 2016-03-03 15:06:23 -08:00
hpfs Merge remote-tracking branch 'f2fs/linux-3.10.y' into HEAD 2017-04-18 17:02:28 +02:00
hppfs
hugetlbfs mm: larger stack guard gap, between vmas 2017-07-11 00:00:39 +00:00
isofs isofs: fix timestamps beyond 2027 2019-07-27 21:46:04 +02:00
jbd
jbd2 jbd2: if the journal is aborted then don't allow update of the log tail 2019-07-27 21:52:00 +02:00
jffs2 Merge tag 'LA.BR.1.3.6-03910-8976.0' of https://source.codeaurora.org/quic/la/kernel/msm-3.10 into HEAD 2017-05-26 13:28:48 +02:00
jfs posix_acl: Clear SGID bit when setting file permissions 2019-07-27 21:42:52 +02:00
lockd lockd: create NSM handles per net namespace 2016-03-03 15:06:20 -08:00
logfs
minix it's still short a few helpers, but infrastructure should be OK now... 2018-12-03 11:52:03 +01:00
ncpfs This is the 3.10.84 stable release 2015-09-30 13:25:40 +05:30
nfs This is the 3.10.99 stable release 2017-04-18 17:17:46 +02:00
nfs_common
nfsd nfsd: auth: Fix gid sorting when rootsquash enabled 2019-07-27 21:46:18 +02:00
nilfs2 This is the 3.10.84 stable release 2015-09-30 13:25:40 +05:30
nls
notify fanotify: fix logic of events on child 2019-07-27 21:52:17 +02:00
ntfs fs: push sync_filesystem() down to the file system's remount_fs() 2015-09-16 18:20:11 +05:30
ocfs2 posix_acl: Clear SGID bit when setting file permissions 2019-07-27 21:42:52 +02:00
omfs fs, omfs: add NULL terminator in the end up the token list 2015-06-05 23:19:54 -07:00
openpromfs fs: push sync_filesystem() down to the file system's remount_fs() 2015-09-16 18:20:11 +05:30
proc mm: per-thread vma caching 2019-07-27 22:08:06 +02:00
pstore pstore/ram: Do not treat empty buffers as valid 2019-07-27 21:53:37 +02:00
qnx4 fs: push sync_filesystem() down to the file system's remount_fs() 2015-09-16 18:20:11 +05:30
qnx6 fs: push sync_filesystem() down to the file system's remount_fs() 2015-09-16 18:20:11 +05:30
quota quota: provide interface for readding allocated space into reserved space 2015-01-29 17:40:57 -08:00
ramfs
reiserfs posix_acl: Clear SGID bit when setting file permissions 2017-04-28 00:00:11 -07:00
romfs fs: push sync_filesystem() down to the file system's remount_fs() 2015-09-16 18:20:11 +05:30
sdcardfs ANDROID: sdcardfs: Add option to not link obb 2019-07-27 21:53:28 +02:00
sdfat sdfat: Capitalize config options 2019-07-27 22:08:28 +02:00
squashfs Squashfs: Add LZ4 compression configuration option 2015-09-16 18:20:12 +05:30
sysfs Import latest Samsung release 2017-04-18 03:43:52 +02:00
sysv This is the 3.10.97 stable release 2017-04-18 17:17:20 +02:00
ubifs fs: push sync_filesystem() down to the file system's remount_fs() 2015-09-16 18:20:11 +05:30
udf This is the 3.10.98 stable release 2017-04-18 17:17:24 +02:00
ufs fs: push sync_filesystem() down to the file system's remount_fs() 2015-09-16 18:20:11 +05:30
xfs posix_acl: Clear SGID bit when setting file permissions 2019-07-27 21:42:52 +02:00
yaffs2 fs: yaffs2: initialize delayed workqueue before using it 2013-11-26 23:29:26 -08:00
aio.c fix io_destroy()/aio_complete() race 2019-07-27 21:49:38 +02:00
anon_inodes.c
attr.c vfs: Add setattr2 for filesystems with per mount permissions 2018-02-06 13:12:20 +01:00
bad_inode.c
binfmt_aout.c mm: remove free_area_cache 2014-02-07 13:49:41 -08:00
binfmt_elf.c binfmt_elf: Respect error return from `regset->active' 2019-07-27 21:51:40 +02:00
binfmt_elf_fdpic.c
binfmt_em86.c
binfmt_flat.c
binfmt_misc.c fs/binfmt_misc.c: do not allow offset overflow 2019-07-27 21:52:50 +02:00
binfmt_script.c
binfmt_som.c
bio-integrity.c bio-integrity: Fix bio_integrity_verify segment start bug 2014-03-23 21:38:21 -07:00
bio.c more bio_map_user_iov() leak fixes 2019-07-27 21:45:37 +02:00
block_dev.c block: protect iterate_bdevs() against concurrent close 2019-07-27 21:42:54 +02:00
buffer.c Import latest Samsung release 2017-04-18 03:43:52 +02:00
char_dev.c
compat.c constify ->actor 2015-09-16 18:20:09 +05:30
compat_binfmt_elf.c binfmt_elf: add ELF_HWCAP2 to compat auxv entries 2015-03-19 14:52:32 -07:00
compat_ioctl.c fs: Add TTY PM IOCTLs to compat table 2014-07-30 10:25:00 -06:00
coredump.c coredump: fix unfreezable coredumping task 2019-07-27 21:42:15 +02:00
coredump.h
dcache.c fs: take_dentry_name_snapshot: avoid kfree under spinlock fixup 2019-07-27 21:45:27 +02:00
dcookies.c fs/compat: fix lookup_dcookie() parameter handling 2014-02-13 13:48:00 -08:00
direct-io.c direct-io: Prevent NULL pointer access in submit_page_section 2019-07-27 21:44:19 +02:00
drop_caches.c Import latest Samsung release 2017-04-18 03:43:52 +02:00
eventfd.c
eventpoll.c fs/epoll: drop ovflist branch prediction 2019-07-27 22:06:04 +02:00
exec.c allow build_open_flags() to return an error 2019-07-27 22:08:22 +02:00
fcntl.c vfs: add missing check for __O_TMPFILE in fcntl_init() 2018-12-03 11:52:41 +01:00
fhandle.c vfs: read file_handle only once in handle_to_path. 2015-07-22 07:25:30 -07:00
file.c Merge upstream linux-stable v3.10.36 into msm-3.10 2014-04-23 16:23:49 -07:00
file_table.c get rid of s_files and files_lock 2015-07-03 19:48:08 -07:00
filesystems.c
fs-writeback.c bdi: Fix oops in wb_workfn() 2019-07-27 21:52:12 +02:00
fs_struct.c sdcardfs: override umask on mkdir and create 2018-02-06 13:12:18 +01:00
generic_acl.c tmpfs: clear S_ISGID when setting posix ACLs 2017-04-22 23:02:57 +02:00
inode.c Fix up non-directory creation in SGID directories 2019-07-27 21:51:41 +02:00
internal.h allow build_open_flags() to return an error 2019-07-27 22:08:22 +02:00
ioctl.c
ioprio.c block: fix use-after-free in sys_ioprio_get() 2016-11-19 20:01:20 -08:00
Kconfig Initial port of sdcardfs 2018-02-06 13:12:17 +01:00
Kconfig.binfmt
libfs.c move d_rcu from overlapping d_child to overlapping d_alias 2015-04-29 10:34:00 +02:00
locks.c locks: fix locks_mandatory_locked to respect file-private locks 2019-07-27 22:08:10 +02:00
Makefile Initial port of sdcardfs 2018-02-06 13:12:17 +01:00
mbcache.c
mount.h vfs: Is mounted should be testing mnt_ns for NULL or error. 2014-02-06 11:08:16 -08:00
mpage.c
namei.c allow build_open_flags() to return an error 2019-07-27 22:08:22 +02:00
namespace.c Don't leak MNT_INTERNAL away from internal mounts 2019-07-27 21:52:13 +02:00
no-block.c
open.c allow build_open_flags() to return an error 2019-07-27 22:08:22 +02:00
pipe.c pipe: read buffer limits atomically 2019-07-27 21:49:46 +02:00
pnode.c BACKPORT: smarter propagate_mnt() 2019-07-27 21:51:52 +02:00
pnode.h BACKPORT: smarter propagate_mnt() 2019-07-27 21:51:52 +02:00
posix_acl.c posix_acl: Clear SGID bit when setting file permissions 2019-07-27 21:42:52 +02:00
proc_namespace.c vfs: Allow filesystems to access their private mount data 2018-02-06 13:12:19 +01:00
read_write.c fs: Workaround the compiler's bad optimization 2016-02-04 13:23:34 +05:30
readdir.c fs: readdir: Fix su hide patch for non-iterate filesystems 2017-07-14 21:04:43 +02:00
select.c
seq_file.c Make file credentials available to the seqfile interfaces 2019-07-27 22:05:58 +02:00
signalfd.c signalfd: fix information leak in signalfd_copyinfo 2015-08-16 20:51:42 -07:00
splice.c vfs: fix uninitialized flags in splice_to_pipe() 2019-07-27 21:43:53 +02:00
stack.c
stat.c quota: provide interface for readding allocated space into reserved space 2015-01-29 17:40:57 -08:00
statfs.c vfs: allow O_PATH file descriptors for fstatfs() 2013-10-18 07:45:44 -07:00
super.c vfs: Allow filesystems to access their private mount data 2018-02-06 13:12:19 +01:00
sync.c Import T813XXS2BRC2 kernel source changes 2018-05-26 00:39:42 +02:00
timerfd.c timerfd: Protect the might cancel mechanism proper 2017-11-08 05:33:07 -08:00
utimes.c vfs: Add setattr2 for filesystems with per mount permissions 2018-02-06 13:12:20 +01:00
xattr.c getxattr: use correct xattr length 2019-07-27 21:51:26 +02:00
xattr_acl.c