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Zhihao Cheng 6b7ae4a904 quota: Check next/prev free block number after reading from quota file 
commit 6c8ea8b8cd4722efd419f91ca46a2dc81b7d89a3 upstream.

Following process:
 Init: v2_read_file_info: <3> dqi_free_blk 0 dqi_free_entry 5 dqi_blks 6

 Step 1. chown bin f_a -> dquot_acquire -> v2_write_dquot:
  qtree_write_dquot
   do_insert_tree
    find_free_dqentry
     get_free_dqblk
      write_blk(info->dqi_blocks) // info->dqi_blocks = 6, failure. The
	   content in physical block (corresponding to blk 6) is random.

 Step 2. chown root f_a -> dquot_transfer -> dqput_all -> dqput ->
         ext4_release_dquot -> v2_release_dquot -> qtree_delete_dquot:
  dquot_release
   remove_tree
    free_dqentry
     put_free_dqblk(6)
      info->dqi_free_blk = blk    // info->dqi_free_blk = 6

 Step 3. drop cache (buffer head for block 6 is released)

 Step 4. chown bin f_b -> dquot_acquire -> commit_dqblk -> v2_write_dquot:
  qtree_write_dquot
   do_insert_tree
    find_free_dqentry
     get_free_dqblk
      dh = (struct qt_disk_dqdbheader *)buf
      blk = info->dqi_free_blk     // 6
      ret = read_blk(info, blk, buf)  // The content of buf is random
      info->dqi_free_blk = le32_to_cpu(dh->dqdh_next_free)  // random blk

 Step 5. chown bin f_c -> notify_change -> ext4_setattr -> dquot_transfer:
  dquot = dqget -> acquire_dquot -> ext4_acquire_dquot -> dquot_acquire ->
          commit_dqblk -> v2_write_dquot -> dq_insert_tree:
   do_insert_tree
    find_free_dqentry
     get_free_dqblk
      blk = info->dqi_free_blk    // If blk < 0 and blk is not an error
				     code, it will be returned as dquot

  transfer_to[USRQUOTA] = dquot  // A random negative value
  __dquot_transfer(transfer_to)
   dquot_add_inodes(transfer_to[cnt])
    spin_lock(&dquot->dq_dqb_lock)  // page fault

, which will lead to kernel page fault:
 Quota error (device sda): qtree_write_dquot: Error -8000 occurred
 while creating quota
 BUG: unable to handle page fault for address: ffffffffffffe120
 #PF: supervisor write access in kernel mode
 #PF: error_code(0x0002) - not-present page
 Oops: 0002 [#1] PREEMPT SMP
 CPU: 0 PID: 5974 Comm: chown Not tainted 6.0.0-rc1-00004
 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996)
 RIP: 0010:_raw_spin_lock+0x3a/0x90
 Call Trace:
  dquot_add_inodes+0x28/0x270
  __dquot_transfer+0x377/0x840
  dquot_transfer+0xde/0x540
  ext4_setattr+0x405/0x14d0
  notify_change+0x68e/0x9f0
  chown_common+0x300/0x430
  __x64_sys_fchownat+0x29/0x40

In order to avoid accessing invalid quota memory address, this patch adds
block number checking of next/prev free block read from quota file.

Fetch a reproducer in [Link].

Link: https://bugzilla.kernel.org/show_bug.cgi?id=216372
Fixes: 1da177e4c3f4152 ("Linux-2.6.12-rc2")
CC: stable@vger.kernel.org
Link: https://lore.kernel.org/r/20220923134555.2623931-2-chengzhihao1@huawei.com
Signed-off-by: Zhihao Cheng <chengzhihao1@huawei.com>
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2022-10-26 13:25:09 +02:00
..
9p
9p: missing chunk of "fs/9p: Don't update file type when updating file attributes"
2022-06-22 14:13:12 +02:00
adfs
Merge branch 'work.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2020-10-24 12:26:05 -07:00
affs
fs/affs: release old buffer head on error path
2021-03-04 11:38:37 +01:00
afs
afs: Return -EAGAIN, not -EREMOTEIO, when a file already locked
2022-09-23 14:17:00 +02:00
autofs
autofs: harden ioctl table
2020-10-16 11:11:22 -07:00
befs
[PATCH] reduce boilerplate in fsid handling
2020-09-18 16:45:50 -04:00
bfs
bfs: don't use WARNING: string when it's just info.
2021-01-06 14:56:52 +01:00
btrfs
btrfs: fix hang during unmount when stopping a space reclaim worker
2022-10-05 10:38:37 +02:00
cachefiles
fs/cachefiles: Remove wait_bit_key layout dependency
2021-03-30 14:32:07 +02:00
ceph
ceph: don't truncate file in atomic_open
2022-10-15 07:55:50 +02:00
cifs
cifs: Fix the error length of VALIDATE_NEGOTIATE_INFO message
2022-10-26 13:25:07 +02:00
coda
…
configfs
configfs: fix a race in configfs_{,un}register_subsystem()
2022-03-02 11:42:52 +01:00
cramfs
[PATCH] reduce boilerplate in fsid handling
2020-09-18 16:45:50 -04:00
crypto
fscrypt: allow 256-bit master keys with AES-256-XTS
2021-11-18 14:03:54 +01:00
debugfs
debugfs: add debugfs_lookup_and_remove()
2022-09-15 11:32:03 +02:00
devpts
fsnotify: fix fsnotify hooks in pseudo filesystems
2022-02-01 17:25:39 +01:00
dlm
fs: dlm: handle -EBUSY first in lock arg validation
2022-10-26 13:25:08 +02:00
ecryptfs
Revert "ecryptfs: replace BUG_ON with error handling code"
2021-05-26 12:06:55 +02:00
efivarfs
efivarfs: revert "fix memory leak in efivarfs_create()"
2020-11-25 16:55:02 +01:00
efs
[PATCH] reduce boilerplate in fsid handling
2020-09-18 16:45:50 -04:00
erofs
erofs: avoid consecutive detection for Highmem memory
2022-08-21 15:15:35 +02:00
exfat
exfat: check if cluster num is valid
2022-06-06 08:42:42 +02:00
exportfs
…
ext2
ext2: Add more validity checks for inode counts
2022-08-21 15:15:28 +02:00
ext4
ext4: make directory inode spreading reflect flexbg size
2022-09-28 11:10:41 +02:00
f2fs
f2fs: fix to do sanity check on segment type in build_sit_entries()
2022-08-25 11:38:21 +02:00
fat
fat: add ratelimit to fat*_ent_bread()
2022-06-09 10:20:58 +02:00
freevxfs
…
fscache
fscache: Fix cookie key hashing
2021-09-18 13:40:15 +02:00
fuse
fuse: Remove the control interface for virtio-fs
2022-08-21 15:16:10 +02:00
gfs2
gfs2: use i_lock spin_lock for inode qadata
2022-06-09 10:20:57 +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
[PATCH] reduce boilerplate in fsid handling
2020-09-18 16:45:50 -04:00
hugetlbfs
mm, hugetlb: allow for "high" userspace addresses
2022-04-27 13:53:54 +02:00
iomap
xfs: use current->journal_info for detecting transaction recursion
2022-07-07 17:52:19 +02:00
isofs
isofs: Fix out of bound access for corrupted isofs image
2021-11-12 14:58:33 +01:00
jbd2
jbd2: fix assertion 'jh->b_frozen_data == NULL' failure when journal aborted
2022-08-21 15:16:04 +02:00
jffs2
jffs2: fix memory leak in jffs2_do_fill_super
2022-06-14 18:32:35 +02:00
jfs
fs: jfs: fix possible NULL pointer dereference in dbFree()
2022-06-09 10:20:57 +02:00
kernfs
kernfs: Separate kernfs_pr_cont_buf and rename_lock.
2022-06-14 18:32:43 +02:00
lockd
lockd: lockd server-side shouldn't set fl_ops
2021-09-18 13:40:30 +02:00
minix
minix: fix bug when opening a file with O_DIRECT
2022-04-13 21:01:01 +02:00
nfs
NFSv4: Turn off open-by-filehandle and NFS re-export for NFSv4.0
2022-09-23 14:16:57 +02:00
nfs_common
nfs_common: need lock during iterate through the list
2020-12-30 11:53:45 +01:00
nfsd
NFSD: Fix verifier returned in stable WRITEs
2022-09-15 11:32:02 +02:00
nilfs2
nilfs2: replace WARN_ONs by nilfs_error for checkpoint acquisition failure
2022-10-15 07:55:50 +02:00
nls
…
notify
fsnotify: fix wrong lockdep annotations
2022-06-09 10:21:03 +02:00
ntfs
ntfs: fix BUG_ON in ntfs_lookup_inode_by_name()
2022-10-05 10:38:39 +02:00
ocfs2
Revert "ocfs2: mount shared volume without ha stack"
2022-08-03 12:00:43 +02:00
omfs
fs: omfs: use kmemdup() rather than kmalloc+memcpy
2020-09-22 23:39:45 -04:00
openpromfs
…
orangefs
orangefs: Fix the size of a memory allocation in orangefs_bufmap_alloc()
2022-01-20 09:17:50 +01:00
overlayfs
ovl: drop WARN_ON() dentry is NULL in ovl_encode_fh()
2022-08-21 15:15:23 +02:00
proc
mm/smaps: don't access young/dirty bit if pte unpresent
2022-08-31 17:15:16 +02:00
pstore
pstore: Don't use semaphores in always-atomic-context code
2022-04-08 14:39:56 +02:00
qnx4
qnx4: work around gcc false positive warning bug
2021-09-30 10:11:08 +02:00
qnx6
[PATCH] reduce boilerplate in fsid handling
2020-09-18 16:45:50 -04:00
quota
quota: Check next/prev free block number after reading from quota file
2022-10-26 13:25:09 +02:00
ramfs
ramfs: fix nommu mmap with gaps in the page cache
2020-10-16 11:11:22 -07:00
reiserfs
reiserfs: check directory items on read from disk
2021-08-12 13:22:19 +02:00
romfs
Merge branch 'work.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2020-10-24 12:26:05 -07:00
squashfs
squashfs: fix divide error in calculate_skip()
2021-05-19 10:13:10 +02:00
sysfs
sysfs: Add sysfs_emit and sysfs_emit_at to format sysfs output
2020-10-02 12:02:30 +02:00
sysv
[PATCH] reduce boilerplate in fsid handling
2020-09-18 16:45:50 -04:00
tracefs
tracefs: Only clobber mode/uid/gid on remount if asked
2022-09-20 12:38:31 +02:00
ubifs
ubifs: Rectify space amount budget for mkdir/tmpfile operations
2022-04-13 21:00:53 +02:00
udf
udf: Fix NULL ptr deref when converting from inline format
2022-02-01 17:25:39 +01:00
ufs
Merge branch 'work.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2020-10-24 12:26:05 -07:00
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
xfs: validate inode fork size against fork format
2022-09-28 11:10:29 +02:00
zonefs
zonefs: fix zonefs_iomap_begin() for reads
2022-06-25 15:16:08 +02:00
aio.c
aio: fix use-after-free due to missing POLLFREE handling
2021-12-14 11:32:40 +01:00
anon_inodes.c
…
attr.c
vfs: Check the truncate maximum size in inode_newsize_ok()
2022-08-21 15:15:22 +02:00
bad_inode.c
…
binfmt_aout.c
…
binfmt_elf_fdpic.c
coredump: Snapshot the vmas in do_coredump
2022-04-08 14:40:44 +02:00
binfmt_elf.c
coredump: Use the vma snapshot in fill_files_note
2022-04-08 14:40:45 +02:00
binfmt_em86.c
…
binfmt_flat.c
binfmt_flat: do not stop relocating GOT entries prematurely on riscv
2022-06-09 10:20:47 +02:00
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
mm, memcg: rework remote charging API to support nesting
2020-10-18 09:27:09 -07:00
char_dev.c
…
compat_binfmt_elf.c
…
coredump.c
coredump: Use the vma snapshot in fill_files_note
2022-04-08 14:40:45 +02:00
d_path.c
fs: fix NULL dereference due to data race in prepend_path()
2020-10-14 14:54:45 -07:00
dax.c
dax: fix cache flush on PMD-mapped pages
2022-06-09 10:21:16 +02:00
dcache.c
…
dcookies.c
…
direct-io.c
fs: direct-io: fix missing sdio->boundary
2021-04-14 08:41:58 +02:00
drop_caches.c
…
eventfd.c
…
eventpoll.c
epoll: autoremove wakers even more aggressively
2022-08-21 15:15:28 +02:00
exec.c
posix-cpu-timers: Cleanup CPU timers before freeing them during exec
2022-08-21 15:16:14 +02:00
fcntl.c
fcntl: fix potential deadlock for &fasync_struct.fa_lock
2021-09-15 09:50:27 +02:00
fhandle.c
…
file_table.c
SUNRPC: Ensure we flush any closed sockets before xs_xprt_free()
2022-05-18 10:23:48 +02:00
file.c
fs: fix fd table size alignment properly
2022-04-08 14:40:30 +02:00
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_parse: mark fs_param_bad_value() as static
2020-10-13 18:38:27 -07:00
fs_pin.c
…
fs_struct.c
…
fs_types.c
…
fs-writeback.c
fs-writeback: writeback_sb_inodes：Recalculate 'wrote' according skipped pages
2022-06-09 10:21:22 +02:00
fsopen.c
…
init.c
…
inode.c
fs: fix UAF/GPF bug in nilfs_mdt_destroy
2022-10-15 07:55:51 +02:00
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: disable polling pollfree files
2022-09-05 10:28:58 +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
fs: fix an infinite loop in iomap_fiemap
2022-05-25 09:17:54 +02:00
Kconfig
tmpfs: disallow CONFIG_TMPFS_INODE64 on alpha
2021-02-17 11:02:21 +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
libfs: fix error cast of negative value in simple_attr_write()
2020-11-22 10:48:22 -08:00
locks.c
Revert "nfsd4: a client's own opens needn't prevent delegations"
2021-03-20 10:43:44 +01:00
Makefile
Refactored code for 5.10:
2020-10-23 11:33:41 -07:00
mbcache.c
…
mount.h
…
mpage.c
…
namei.c
__follow_mount_rcu(): verify that mount_lock remains unchanged
2022-08-21 15:16:15 +02:00
namespace.c
fs: warn about impending deprecation of mandatory locks
2021-08-26 08:35:57 -04:00
no-block.c
…
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: Fix missing lock in pipe_resize_ring()
2022-06-06 08:42:41 +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
proc mountinfo: make splice available again
2020-12-30 11:54:02 +01:00
read_write.c
Refactored code for 5.10:
2020-10-23 11:33:41 -07:00
readdir.c
readdir: make sure to verify directory entry for legacy interfaces too
2021-04-21 13:00:54 +02:00
remap_range.c
fs/remap: constrain dedupe of EOF blocks
2022-07-21 21:20:01 +02:00
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
io_uring: disable polling pollfree files
2022-09-05 10:28:58 +02:00
splice.c
Revert "fs: check FMODE_LSEEK to control internal pipe splicing"
2022-10-17 17:26:07 +02:00
stack.c
…
stat.c
stat: fix inconsistency between struct stat and struct compat_stat
2022-04-27 13:53:54 +02:00
statfs.c
…
super.c
vfs: make freeze_super abort when sync_filesystem returns error
2022-02-23 12:00:59 +01:00
sync.c
vfs: make sync_filesystem return errors from ->sync_fs
2022-08-31 17:15:14 +02:00
timerfd.c
…
userfaultfd.c
userfaultfd: fix a race between writeprotect and exit_mmap()
2021-10-27 09:56:51 +02:00
utimes.c
…
xattr.c
fs/xattr.c: fix kernel-doc warnings for setxattr & removexattr
2020-10-13 18:38:27 -07:00