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WSL2-Linux-Kernel
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WSL2-Linux-Kernel/fs
История
Chao Yu 9dc956b2c8 f2fs: fix to do sanity check with user_block_count 
This patch fixs to do sanity check with user_block_count.

- Overview
Divide zero in utilization when mount() a corrupted f2fs image

- Reproduce (4.18 upstream kernel)

- Kernel message
[  564.099503] F2FS-fs (loop0): invalid crc value
[  564.101991] divide error: 0000 [#1] SMP KASAN PTI
[  564.103103] CPU: 1 PID: 1298 Comm: f2fs_discard-7: Not tainted 4.18.0-rc1+ #4
[  564.104584] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Ubuntu-1.8.2-1ubuntu1 04/01/2014
[  564.106624] RIP: 0010:issue_discard_thread+0x248/0x5c0
[  564.107692] Code: ff ff 48 8b bd e8 fe ff ff 41 8b 9d 4c 04 00 00 e8 cd b8 ad ff 41 8b 85 50 04 00 00 31 d2 48 8d 04 80 48 8d 04 80 48 c1 e0 02 <48> f7 f3 83 f8 50 7e 16 41 c7 86 7c ff ff ff 01 00 00 00 41 c7 86
[  564.111686] RSP: 0018:ffff8801f3117dc0 EFLAGS: 00010206
[  564.112775] RAX: 0000000000000384 RBX: 0000000000000000 RCX: ffffffffb88c1e03
[  564.114250] RDX: 0000000000000000 RSI: dffffc0000000000 RDI: ffff8801e3aa4850
[  564.115706] RBP: ffff8801f3117f00 R08: 1ffffffff751a1d0 R09: fffffbfff751a1d0
[  564.117177] R10: 0000000000000001 R11: fffffbfff751a1d0 R12: 00000000fffffffc
[  564.118634] R13: ffff8801e3aa4400 R14: ffff8801f3117ed8 R15: ffff8801e2050000
[  564.120094] FS:  0000000000000000(0000) GS:ffff8801f6f00000(0000) knlGS:0000000000000000
[  564.121748] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  564.122923] CR2: 000000000202b078 CR3: 00000001f11ac000 CR4: 00000000000006e0
[  564.124383] Call Trace:
[  564.124924]  ? __issue_discard_cmd+0x480/0x480
[  564.125882]  ? __sched_text_start+0x8/0x8
[  564.126756]  ? __kthread_parkme+0xcb/0x100
[  564.127620]  ? kthread_blkcg+0x70/0x70
[  564.128412]  kthread+0x180/0x1d0
[  564.129105]  ? __issue_discard_cmd+0x480/0x480
[  564.130029]  ? kthread_associate_blkcg+0x150/0x150
[  564.131033]  ret_from_fork+0x35/0x40
[  564.131794] Modules linked in: snd_hda_codec_generic snd_hda_intel snd_hda_codec snd_hwdep snd_hda_core snd_pcm snd_timer snd mac_hid i2c_piix4 soundcore ib_iser rdma_cm iw_cm ib_cm ib_core iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx raid1 raid0 multipath linear 8139too crct10dif_pclmul crc32_pclmul qxl drm_kms_helper syscopyarea aesni_intel sysfillrect sysimgblt fb_sys_fops ttm drm aes_x86_64 crypto_simd cryptd 8139cp glue_helper mii pata_acpi floppy
[  564.141798] ---[ end trace 4ce02f25ff7d3df5 ]---
[  564.142773] RIP: 0010:issue_discard_thread+0x248/0x5c0
[  564.143885] Code: ff ff 48 8b bd e8 fe ff ff 41 8b 9d 4c 04 00 00 e8 cd b8 ad ff 41 8b 85 50 04 00 00 31 d2 48 8d 04 80 48 8d 04 80 48 c1 e0 02 <48> f7 f3 83 f8 50 7e 16 41 c7 86 7c ff ff ff 01 00 00 00 41 c7 86
[  564.147776] RSP: 0018:ffff8801f3117dc0 EFLAGS: 00010206
[  564.148856] RAX: 0000000000000384 RBX: 0000000000000000 RCX: ffffffffb88c1e03
[  564.150424] RDX: 0000000000000000 RSI: dffffc0000000000 RDI: ffff8801e3aa4850
[  564.151906] RBP: ffff8801f3117f00 R08: 1ffffffff751a1d0 R09: fffffbfff751a1d0
[  564.153463] R10: 0000000000000001 R11: fffffbfff751a1d0 R12: 00000000fffffffc
[  564.154915] R13: ffff8801e3aa4400 R14: ffff8801f3117ed8 R15: ffff8801e2050000
[  564.156405] FS:  0000000000000000(0000) GS:ffff8801f6f00000(0000) knlGS:0000000000000000
[  564.158070] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  564.159279] CR2: 000000000202b078 CR3: 00000001f11ac000 CR4: 00000000000006e0
[  564.161043] ==================================================================
[  564.162587] BUG: KASAN: stack-out-of-bounds in from_kuid_munged+0x1d/0x50
[  564.163994] Read of size 4 at addr ffff8801f3117c84 by task f2fs_discard-7:/1298

[  564.165852] CPU: 1 PID: 1298 Comm: f2fs_discard-7: Tainted: G      D           4.18.0-rc1+ #4
[  564.167593] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Ubuntu-1.8.2-1ubuntu1 04/01/2014
[  564.169522] Call Trace:
[  564.170057]  dump_stack+0x7b/0xb5
[  564.170778]  print_address_description+0x70/0x290
[  564.171765]  kasan_report+0x291/0x390
[  564.172540]  ? from_kuid_munged+0x1d/0x50
[  564.173408]  __asan_load4+0x78/0x80
[  564.174148]  from_kuid_munged+0x1d/0x50
[  564.174962]  do_notify_parent+0x1f5/0x4f0
[  564.175808]  ? send_sigqueue+0x390/0x390
[  564.176639]  ? css_set_move_task+0x152/0x340
[  564.184197]  do_exit+0x1290/0x1390
[  564.184950]  ? __issue_discard_cmd+0x480/0x480
[  564.185884]  ? mm_update_next_owner+0x380/0x380
[  564.186829]  ? __sched_text_start+0x8/0x8
[  564.187672]  ? __kthread_parkme+0xcb/0x100
[  564.188528]  ? kthread_blkcg+0x70/0x70
[  564.189333]  ? kthread+0x180/0x1d0
[  564.190052]  ? __issue_discard_cmd+0x480/0x480
[  564.190983]  rewind_stack_do_exit+0x17/0x20

[  564.192190] The buggy address belongs to the page:
[  564.193213] page:ffffea0007cc45c0 count:0 mapcount:0 mapping:0000000000000000 index:0x0
[  564.194856] flags: 0x2ffff0000000000()
[  564.195644] raw: 02ffff0000000000 0000000000000000 dead000000000200 0000000000000000
[  564.197247] raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
[  564.198826] page dumped because: kasan: bad access detected

[  564.200299] Memory state around the buggy address:
[  564.201306]  ffff8801f3117b80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[  564.202779]  ffff8801f3117c00: 00 00 00 00 00 00 00 00 00 00 00 f3 f3 f3 f3 f3
[  564.204252] >ffff8801f3117c80: f3 f3 f3 00 00 00 00 00 00 00 00 00 f1 f1 f1 f1
[  564.205742]                    ^
[  564.206424]  ffff8801f3117d00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[  564.207908]  ffff8801f3117d80: f3 f3 f3 f3 f3 f3 f3 f3 00 00 00 00 00 00 00 00
[  564.209389] ==================================================================
[  564.231795] F2FS-fs (loop0): Mounted with checkpoint version = 2

- Location
https://elixir.bootlin.com/linux/v4.18-rc1/source/fs/f2fs/segment.h#L586
	return div_u64((u64)valid_user_blocks(sbi) * 100,
					sbi->user_block_count);
Missing checks on sbi->user_block_count.

Reported-by: Wen Xu <wen.xu@gatech.edu>
Signed-off-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
 		2018-07-28 18:23:23 -07:00
..
9p treewide: kmalloc() -> kmalloc_array() 2018-06-12 16:19:22 -07:00
adfs vfs/y2038: inode timestamps conversion to timespec64 2018-06-15 07:31:07 +09:00
affs
…
afs Merge branch 'afs-proc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2018-06-16 16:32:04 +09:00
autofs autofs: rename 'autofs' module back to 'autofs4' 2018-07-05 11:35:04 -07:00
befs fix a series of Documentation/ broken file name references 2018-06-15 18:10:01 -03:00
bfs
…
btrfs for-4.18-rc2-tag 2018-07-01 12:38:16 -07:00
cachefiles
…
ceph ceph: fix dentry leak in splice_dentry() 2018-06-26 18:42:44 +02:00
cifs cifs: Fix invalid check in __cifs_calc_signature() 2018-06-15 19:17:40 -05:00
coda
…
configfs
…
cramfs vfs/y2038: inode timestamps conversion to timespec64 2018-06-15 07:31:07 +09:00
crypto f2fs-for-4.18-rc1 2018-06-11 10:16:13 -07:00
debugfs Revert "debugfs: inode: debugfs_create_dir uses mode permission from parent" 2018-06-12 20:52:16 -07:00
devpts
…
dlm treewide: Use array_size() in vmalloc() 2018-06-12 16:19:22 -07:00
ecryptfs
…
efivarfs
…
efs
…
exofs exofs: avoid VLA in structures 2018-06-15 07:55:24 +09:00
exportfs
…
ext2 ext2: add warning when specifying nocheck option 2018-06-20 11:04:26 +02:00
ext4 vfs/y2038: inode timestamps conversion to timespec64 2018-06-15 07:31:07 +09:00
f2fs f2fs: fix to do sanity check with user_block_count 2018-07-28 18:23:23 -07:00
fat Merge branch 'akpm' (patches from Andrew) 2018-06-15 08:51:42 +09:00
freevxfs
…
fscache
…
fuse vfs/y2038: inode timestamps conversion to timespec64 2018-06-15 07:31:07 +09:00
gfs2 vfs/y2038: inode timestamps conversion to timespec64 2018-06-15 07:31:07 +09:00
hfs vfs/y2038: inode timestamps conversion to timespec64 2018-06-15 07:31:07 +09:00
hfsplus vfs/y2038: inode timestamps conversion to timespec64 2018-06-15 07:31:07 +09:00
hostfs
…
hpfs treewide: kmalloc() -> kmalloc_array() 2018-06-12 16:19:22 -07:00
hugetlbfs
…
isofs
…
jbd2 treewide: kmalloc() -> kmalloc_array() 2018-06-12 16:19:22 -07:00
jffs2 vfs/y2038: inode timestamps conversion to timespec64 2018-06-15 07:31:07 +09:00
jfs This fixes a too-small allocation in the xattr code. 2018-06-19 07:47:32 +09:00
kernfs vfs/y2038: inode timestamps conversion to timespec64 2018-06-15 07:31:07 +09:00
lockd
…
minix
…
nfs NFS client bugfixes for Linux 4.18 2018-06-22 06:21:34 +09:00
nfs_common
…
nfsd vfs/y2038: inode timestamps conversion to timespec64 2018-06-15 07:31:07 +09:00
nilfs2
…
nls
…
notify
…
ntfs vfs/y2038: inode timestamps conversion to timespec64 2018-06-15 07:31:07 +09:00
ocfs2 vfs/y2038: inode timestamps conversion to timespec64 2018-06-15 07:31:07 +09:00
omfs
…
openpromfs
…
orangefs Solve a series of broken links for files under Documentation: 2018-06-17 05:25:18 +09:00
overlayfs vfs/y2038: inode timestamps conversion to timespec64 2018-06-15 07:31:07 +09:00
proc Merge branch 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2018-07-01 12:32:19 -07:00
pstore pstore: Remove bogus format string definition 2018-06-14 14:57:24 +02:00
qnx4
…
qnx6
…
quota quota: Cleanup list iteration in dqcache_shrink_scan() 2018-06-20 11:04:26 +02:00
ramfs
…
reiserfs vfs/y2038: inode timestamps conversion to timespec64 2018-06-15 07:31:07 +09:00
romfs
…
squashfs
…
sysfs
…
sysv
…
tracefs
…
ubifs vfs/y2038: inode timestamps conversion to timespec64 2018-06-15 07:31:07 +09:00
udf udf: Drop unused arguments of udf_delete_aext() 2018-06-20 11:05:49 +02:00
ufs treewide: kmalloc() -> kmalloc_array() 2018-06-12 16:19:22 -07:00
xfs xfs: fix fdblocks accounting w/ RMAPBT per-AG reservation 2018-06-24 12:00:12 -07:00
Kconfig autofs: remove left-over autofs4 stubs 2018-06-11 08:22:34 -07:00
Kconfig.binfmt docs: Fix more broken references 2018-06-15 18:11:26 -03:00
Makefile autofs: remove left-over autofs4 stubs 2018-06-11 08:22:34 -07:00
aio.c Revert changes to convert to ->poll_mask() and aio IOCB_CMD_POLL 2018-06-28 10:40:47 -07:00
anon_inodes.c
…
attr.c vfs/y2038: inode timestamps conversion to timespec64 2018-06-15 07:31:07 +09:00
bad_inode.c
…
binfmt_aout.c
…
binfmt_elf.c coredump: fix spam with zero VMA process 2018-06-15 07:55:24 +09:00
binfmt_elf_fdpic.c treewide: kmalloc() -> kmalloc_array() 2018-06-12 16:19:22 -07:00
binfmt_em86.c
…
binfmt_flat.c
…
binfmt_misc.c docs: Fix more broken references 2018-06-15 18:11:26 -03:00
binfmt_script.c
…
block_dev.c treewide: kmalloc() -> kmalloc_array() 2018-06-12 16:19:22 -07:00
buffer.c
…
char_dev.c
…
compat.c
…
compat_binfmt_elf.c
…
compat_ioctl.c autofs: clean up includes 2018-06-07 17:34:40 -07:00
coredump.c
…
d_path.c
…
dax.c libnvdimm for 4.18 2018-06-08 17:21:52 -07:00
dcache.c
…
dcookies.c
…
direct-io.c
…
drop_caches.c
…
eventfd.c Revert changes to convert to ->poll_mask() and aio IOCB_CMD_POLL 2018-06-28 10:40:47 -07:00
eventpoll.c Revert changes to convert to ->poll_mask() and aio IOCB_CMD_POLL 2018-06-28 10:40:47 -07:00
exec.c Merge branch 'core-rseq-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2018-06-10 10:17:09 -07:00
fcntl.c mm: restructure memfd code 2018-06-07 17:34:35 -07:00
fhandle.c
…
file.c
…
file_table.c
…
filesystems.c
…
fs-writeback.c
…
fs_pin.c
…
fs_struct.c
…
inode.c Fix up non-directory creation in SGID directories 2018-07-05 12:36:36 -07:00
internal.h
…
ioctl.c
…
iomap.c Changes since last update: 2018-06-12 15:49:00 -07:00
libfs.c
…
locks.c vfs/y2038: inode timestamps conversion to timespec64 2018-06-15 07:31:07 +09:00
mbcache.c treewide: kmalloc() -> kmalloc_array() 2018-06-12 16:19:22 -07:00
mount.h
…
mpage.c
…
namei.c Merge branch 'afs-proc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2018-06-16 16:32:04 +09:00
namespace.c
…
no-block.c
…
nsfs.c
…
open.c
…
pipe.c Revert changes to convert to ->poll_mask() and aio IOCB_CMD_POLL 2018-06-28 10:40:47 -07:00
pnode.c
…
pnode.h
…
posix_acl.c
…
proc_namespace.c
…
read_write.c treewide: kmalloc() -> kmalloc_array() 2018-06-12 16:19:22 -07:00
readdir.c
…
select.c Revert changes to convert to ->poll_mask() and aio IOCB_CMD_POLL 2018-06-28 10:40:47 -07:00
seq_file.c
…
signalfd.c Merge branch 'work.compat' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2018-06-16 16:21:50 +09:00
splice.c Merge branch 'work.compat' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2018-06-16 16:21:50 +09:00
stack.c
…
stat.c
…
statfs.c
…
super.c
…
sync.c
…
timerfd.c Revert changes to convert to ->poll_mask() and aio IOCB_CMD_POLL 2018-06-28 10:40:47 -07:00
userfaultfd.c userfaultfd: hugetlbfs: fix userfaultfd_huge_must_wait() pte access 2018-07-03 17:32:18 -07:00
utimes.c
…
xattr.c
…