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Nikita Zhandarovich 772a7def98 do_sys_name_to_handle(): use kzalloc() to fix kernel-infoleak 
[ Upstream commit 3948abaa4e2be938ccdfc289385a27342fb13d43 ]

syzbot identified a kernel information leak vulnerability in
do_sys_name_to_handle() and issued the following report [1].

[1]
"BUG: KMSAN: kernel-infoleak in instrument_copy_to_user include/linux/instrumented.h:114 [inline]
BUG: KMSAN: kernel-infoleak in _copy_to_user+0xbc/0x100 lib/usercopy.c:40
 instrument_copy_to_user include/linux/instrumented.h:114 [inline]
 _copy_to_user+0xbc/0x100 lib/usercopy.c:40
 copy_to_user include/linux/uaccess.h:191 [inline]
 do_sys_name_to_handle fs/fhandle.c:73 [inline]
 __do_sys_name_to_handle_at fs/fhandle.c:112 [inline]
 __se_sys_name_to_handle_at+0x949/0xb10 fs/fhandle.c:94
 __x64_sys_name_to_handle_at+0xe4/0x140 fs/fhandle.c:94
 ...

Uninit was created at:
 slab_post_alloc_hook+0x129/0xa70 mm/slab.h:768
 slab_alloc_node mm/slub.c:3478 [inline]
 __kmem_cache_alloc_node+0x5c9/0x970 mm/slub.c:3517
 __do_kmalloc_node mm/slab_common.c:1006 [inline]
 __kmalloc+0x121/0x3c0 mm/slab_common.c:1020
 kmalloc include/linux/slab.h:604 [inline]
 do_sys_name_to_handle fs/fhandle.c:39 [inline]
 __do_sys_name_to_handle_at fs/fhandle.c:112 [inline]
 __se_sys_name_to_handle_at+0x441/0xb10 fs/fhandle.c:94
 __x64_sys_name_to_handle_at+0xe4/0x140 fs/fhandle.c:94
 ...

Bytes 18-19 of 20 are uninitialized
Memory access of size 20 starts at ffff888128a46380
Data copied to user address 0000000020000240"

Per Chuck Lever's suggestion, use kzalloc() instead of kmalloc() to
solve the problem.

Fixes: 990d6c2d7aee ("vfs: Add name to file handle conversion support")
Suggested-by: Chuck Lever III <chuck.lever@oracle.com>
Reported-and-tested-by: <syzbot+09b349b3066c2e0b1e96@syzkaller.appspotmail.com>
Signed-off-by: Nikita Zhandarovich <n.zhandarovich@fintech.ru>
Link: https://lore.kernel.org/r/20240119153906.4367-1-n.zhandarovich@fintech.ru
Reviewed-by: Jan Kara <jack@suse.cz>
Signed-off-by: Christian Brauner <brauner@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
2024-03-26 18:22:13 -04:00
..
9p
9p: missing chunk of "fs/9p: Don't update file type when updating file attributes"
2022-06-22 14:11:02 +02:00
adfs
…
affs
affs: initialize fsdata in affs_truncate()
2023-02-06 07:52:36 +01:00
afs
afs: Fix endless loop in directory parsing
2024-03-06 14:36:09 +00:00
autofs
autofs: fix memory leak of waitqueues in autofs_catatonic_mode
2023-09-23 11:00:02 +02:00
befs
…
bfs
bfs: don't use WARNING: string when it's just info.
2021-01-06 14:48:39 +01:00
btrfs
btrfs: fix data race at btrfs_use_block_rsv() when accessing block reserve
2024-03-26 18:22:13 -04:00
cachefiles
cachefiles: fix memory leak in cachefiles_add_cache()
2024-03-06 14:36:10 +00:00
ceph
ceph: fix deadlock or deadcode of misusing dget()
2024-02-23 08:25:03 +01:00
cifs
smb: client: fix OOB in smbCalcSize()
2024-01-08 11:29:47 +01:00
coda
coda: Avoid partial allocation of sig_inputArgs
2023-03-11 16:43:56 +01:00
configfs
configfs: fix possible memory leak in configfs_create_dir()
2023-01-18 11:41:09 +01:00
cramfs
…
crypto
fscrypt: add fscrypt_symlink_getattr() for computing st_size
2021-09-12 08:56:38 +02:00
debugfs
new helper: lookup_positive_unlocked()
2023-09-23 10:59:40 +02:00
devpts
fsnotify: fix fsnotify hooks in pseudo filesystems
2022-02-01 17:24:34 +01:00
dlm
dlm: fix plock lookup when using multiple lockspaces
2023-09-23 10:59:55 +02:00
ecryptfs
ecryptfs: Reject casefold directory inodes
2024-02-23 08:24:56 +01:00
efivarfs
efivarfs: revert "fix memory leak in efivarfs_create()"
2020-12-02 08:49:53 +01:00
efs
…
erofs
erofs: ensure that the post-EOF tails are all zeroed
2023-09-23 10:59:36 +02:00
exportfs
…
ext2
ext2: fix datatype of block number in ext2_xattr_set2()
2023-09-23 11:00:04 +02:00
ext4
ext4: avoid allocating blocks from corrupted group in ext4_mb_find_by_goal()
2024-03-01 13:13:33 +01:00
f2fs
f2fs: fix to check return value of f2fs_reserve_new_block()
2024-02-23 08:25:00 +01:00
fat
treewide: Remove uninitialized_var() usage
2023-06-09 10:29:01 +02:00
freevxfs
…
fscache
fscache: Fix cookie key hashing
2021-09-22 12:26:25 +02:00
fuse
fuse: nlookup missing decrement in fuse_direntplus_link
2023-09-23 11:00:00 +02:00
gfs2
gfs2: Fix kernel NULL pointer dereference in gfs2_rgrp_dump
2024-01-25 14:34:24 -08:00
hfs
hfs: fix missing hfs_bnode_get() in __hfs_bnode_create
2023-03-11 16:43:59 +01:00
hfsplus
treewide: Remove uninitialized_var() usage
2023-06-09 10:29:01 +02:00
hostfs
hostfs: fix memory handling in follow_link()
2021-04-14 08:24:14 +02:00
hpfs
…
hugetlbfs
fs,hugetlb: fix NULL pointer dereference in hugetlbs_fill_super
2024-03-06 14:36:10 +00:00
iomap
iomap: Set all uptodate bits for an Uptodate page
2024-03-01 13:13:35 +01:00
isofs
treewide: Remove uninitialized_var() usage
2023-06-09 10:29:01 +02:00
jbd2
jbd2: correct the printing of write_flags in jbd2_write_superblock()
2024-01-25 14:34:20 -08:00
jffs2
jffs2: reduce stack usage in jffs2_build_xattr_subsystem()
2023-07-27 08:37:25 +02:00
jfs
jfs: fix array-index-out-of-bounds in diNewExt
2024-02-23 08:24:55 +01:00
kernfs
fs/kernfs/dir: obey S_ISGID
2024-02-23 08:25:03 +01:00
lockd
fs: lockd: avoid possible wrong NULL parameter
2023-09-23 10:59:48 +02:00
minix
minix: fix bug when opening a file with O_DIRECT
2022-04-15 14:18:35 +02:00
nfs
NFSv4.1/pnfs: Ensure we handle the error NFS4ERR_RETURNCONFLICT
2024-01-25 14:34:24 -08:00
nfs_common
nfs_common: need lock during iterate through the list
2020-12-30 11:51:22 +01:00
nfsd
nfsd: fix file memleak on client_opens_release
2023-11-28 16:50:21 +00:00
nilfs2
nilfs2: replace WARN_ONs for invalid DAT metadata block requests
2024-03-01 13:13:32 +01:00
nls
fs/nls: make load_nls() take a const parameter
2023-09-23 10:59:38 +02:00
notify
fanotify: disallow mount/sb marks on kernel internal pseudo fs
2023-07-27 08:37:26 +02:00
ntfs
ntfs: check overflow when iterating ATTR_RECORDs
2022-11-25 17:42:22 +01:00
ocfs2
fs: move S_ISGID stripping into the vfs_*() helpers
2024-02-23 08:24:49 +01:00
omfs
treewide: Remove uninitialized_var() usage
2023-06-09 10:29:01 +02:00
openpromfs
…
orangefs
orangefs: Fix kmemleak in orangefs_{kernel,client}_debug_init()
2023-01-18 11:41:39 +01:00
overlayfs
ovl: skip overlayfs superblocks at global sync
2023-12-08 08:44:27 +01:00
proc
procfs: block chmod on /proc/thread-self/comm
2023-09-23 10:59:55 +02:00
pstore
pstore/ram: Fix crash when setting number of cpus to an odd number
2024-02-23 08:24:55 +01:00
qnx4
qnx4: work around gcc false positive warning bug
2021-09-30 10:09:26 +02:00
qnx6
…
quota
quota: explicitly forbid quota files from being encrypted
2023-11-28 16:50:19 +00:00
ramfs
ramfs: fix nommu mmap with gaps in the page cache
2020-10-29 09:57:53 +01:00
reiserfs
reiserfs: Check the return value from __getblk()
2023-09-23 10:59:40 +02:00
romfs
romfs: fix uninitialized memory leak in romfs_dev_read()
2020-08-26 10:40:51 +02:00
squashfs
revert "squashfs: harden sanity check in squashfs_read_xattr_id_table"
2023-02-22 12:50:39 +01:00
sysfs
sysfs: Add sysfs_emit and sysfs_emit_at to format sysfs output
2021-03-07 12:20:48 +01:00
sysv
fs/sysv: Null check to prevent null-ptr-deref bug
2023-08-11 11:53:59 +02:00
tracefs
tracefs: Add missing lockdown check to tracefs_create_dir()
2023-09-23 11:00:06 +02:00
ubifs
ubifs: ubifs_symlink: Fix memleak of inode->i_link in error path
2024-02-23 08:24:49 +01:00
udf
udf: initialize newblock to 0
2023-09-23 10:59:56 +02:00
ufs
fs/ufs: avoid potential u32 multiplication overflow
2020-08-21 13:05:37 +02:00
unicode
…
verity
fsverity: skip PKCS#7 parser when keyring is empty
2023-09-23 10:59:55 +02:00
xfs
xfs: verify buffer contents when we skip log replay
2023-06-28 10:18:42 +02:00
aio.c
fs/aio: Restrict kiocb_set_cancel_fn() to I/O submitted via libaio
2024-03-01 13:13:38 +01:00
anon_inodes.c
…
attr.c
attr: block mode changes of symlinks
2023-09-23 11:00:06 +02:00
bad_inode.c
…
binfmt_aout.c
binfmt: Move install_exec_creds after setup_new_exec to match binfmt_elf
2023-01-18 11:41:46 +01:00
binfmt_elf_fdpic.c
fs: binfmt_elf_efpic: fix personality for ELF-FDPIC
2023-10-10 21:46:42 +02:00
binfmt_elf.c
elf: don't use MAP_FIXED_NOREPLACE for elf interpreter mappings
2021-10-06 15:42:35 +02:00
binfmt_em86.c
…
binfmt_flat.c
binfmt: Move install_exec_creds after setup_new_exec to match binfmt_elf
2023-01-18 11:41:46 +01:00
binfmt_misc.c
binfmt_misc: fix shift-out-of-bounds in check_special_flags
2023-01-18 11:41:33 +01:00
binfmt_script.c
…
block_dev.c
block: Don't invalidate pagecache for invalid falloc modes
2024-01-08 11:29:48 +01:00
buffer.c
mm: fs: initialize fsdata passed to write_begin/write_end interface
2022-11-25 17:42:22 +01:00
char_dev.c
chardev: fix error handling in cdev_device_add()
2023-01-18 11:41:25 +01:00
compat_binfmt_elf.c
…
compat_ioctl.c
lsm: new security_file_ioctl_compat() hook
2024-02-23 08:25:15 +01:00
compat.c
…
coredump.c
coredump: fix core_pattern parse error
2020-12-11 13:23:30 +01:00
d_path.c
fs: fix NULL dereference due to data race in prepend_path()
2020-10-29 09:57:45 +01:00
dax.c
dax: fix cache flush on PMD-mapped pages
2022-06-14 18:11:41 +02:00
dcache.c
fast_dput(): handle underflows gracefully
2024-02-23 08:25:00 +01:00
dcookies.c
…
direct-io.c
fs: direct-io: fix missing sdio->boundary
2021-04-14 08:24:11 +02:00
drop_caches.c
…
eventfd.c
eventfd: prevent underflow for eventfd semaphores
2023-09-23 10:59:40 +02:00
eventpoll.c
epoll: ep_autoremove_wake_function should use list_del_init_careful
2023-06-28 10:18:35 +02:00
exec.c
exec: Force single empty string when argv is empty
2022-06-06 08:33:50 +02:00
fcntl.c
fcntl: fix potential deadlock for &fasync_struct.fa_lock
2021-09-15 09:47:28 +02:00
fhandle.c
do_sys_name_to_handle(): use kzalloc() to fix kernel-infoleak
2024-03-26 18:22:13 -04:00
file_table.c
SUNRPC: Ensure we flush any closed sockets before xs_xprt_free()
2022-05-25 09:14:34 +02:00
file.c
fs: prevent out-of-bounds array speculation when closing a file descriptor
2023-03-17 08:32:47 +01:00
filesystems.c
fs/filesystems.c: downgrade user-reachable WARN_ONCE() to pr_warn_once()
2020-04-17 10:50:21 +02:00
fs_context.c
fs: avoid empty option when generating legacy mount string
2023-07-27 08:37:25 +02:00
fs_parser.c
…
fs_pin.c
…
fs_struct.c
…
fs_types.c
…
fs-writeback.c
writeback: fix call of incorrect macro
2023-05-17 11:35:58 +02:00
fsopen.c
…
inode.c
fs: move S_ISGID stripping into the vfs_*() helpers
2024-02-23 08:24:49 +01:00
internal.h
fs: Establish locking order for unrelated directories
2023-07-27 08:37:26 +02:00
io_uring.c
io_uring: drop any code related to SCM_RIGHTS
2024-03-26 18:22:12 -04:00
ioctl.c
…
Kconfig
…
Kconfig.binfmt
…
libfs.c
libfs: add DEFINE_SIMPLE_ATTRIBUTE_SIGNED for signed value
2023-01-18 11:40:55 +01:00
locks.c
locks: fix KASAN: use-after-free in trace_event_raw_event_filelock_lock
2023-09-23 11:00:02 +02:00
Makefile
…
mbcache.c
mbcache: Avoid nesting of cache->c_list_lock under bit locks
2023-01-18 11:41:59 +01:00
mount.h
…
mpage.c
…
namei.c
fs: move S_ISGID stripping into the vfs_*() helpers
2024-02-23 08:24:49 +01:00
namespace.c
fs: warn about impending deprecation of mandatory locks
2021-08-26 08:36:22 -04:00
no-block.c
…
nsfs.c
…
open.c
cifs_atomic_open(): fix double-put on late allocation failure
2020-03-18 07:17:51 +01:00
pipe.c
pipe: increase minimum default pipe size to 2 pages
2021-08-12 13:21:02 +02:00
pnode.c
pnode: terminate at peers of source
2023-01-18 11:41:44 +01:00
pnode.h
mount: fix mounting of detached mounts onto targets that reside on shared mounts
2021-03-17 17:03:33 +01:00
posix_acl.c
…
proc_namespace.c
…
read_write.c
…
readdir.c
readdir: make sure to verify directory entry for legacy interfaces too
2021-04-21 12:56:16 +02:00
select.c
select: Fix indefinitely sleeping task in poll_schedule_timeout()
2022-01-29 10:25:11 +01:00
seq_file.c
seq_file: disallow extremely large seq buffer allocations
2021-07-20 16:10:54 +02:00
signalfd.c
io_uring: disable polling pollfree files
2022-09-05 10:27:47 +02:00
splice.c
Revert "fs: check FMODE_LSEEK to control internal pipe splicing"
2022-10-17 17:24:32 +02:00
stack.c
…
stat.c
stat: fix inconsistency between struct stat and struct compat_stat
2022-04-27 13:50:48 +02:00
statfs.c
statfs: enforce statfs[64] structure initialization
2023-05-30 12:44:07 +01:00
super.c
fs: Protect reconfiguration of sb read-write from racing writes
2023-08-11 11:53:59 +02:00
sync.c
ovl: skip overlayfs superblocks at global sync
2023-12-08 08:44:27 +01:00
timerfd.c
…
userfaultfd.c
userfaultfd: open userfaultfds with O_RDONLY
2022-10-26 13:22:21 +02:00
utimes.c
…
xattr.c
fs: don't audit the capability check in simple_xattr_list()
2023-01-18 11:40:53 +01:00