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Nikita Zhandarovich 423b6bdf19 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 18:21:14 -04:00
..
9p
9p: v9fs_listxattr: fix %s null argument warning
2023-11-28 16:56:19 +00:00
adfs
…
affs
affs: initialize fsdata in affs_truncate()
2023-02-01 08:27:06 +01:00
afs
afs: Fix endless loop in directory parsing
2024-03-06 14:38:48 +00:00
autofs
autofs: fix memory leak of waitqueues in autofs_catatonic_mode
2023-09-23 11:09:54 +02:00
befs
…
bfs
…
btrfs
btrfs: dev-replace: properly validate device names
2024-03-06 14:38:48 +00:00
cachefiles
cachefiles: fix memory leak in cachefiles_add_cache()
2024-03-06 14:38:50 +00:00
ceph
ceph: prevent use-after-free in encode_cap_msg()
2024-02-23 08:55:09 +01:00
cifs
cifs: fix mid leak during reconnection after timeout threshold
2024-03-01 13:22:00 +01:00
coda
coda: Avoid partial allocation of sig_inputArgs
2023-03-10 09:39:50 +01:00
configfs
configfs: fix possible memory leak in configfs_create_dir()
2022-12-31 13:14:15 +01:00
cramfs
…
crypto
fscrypt: fix keyring memory leak on mount failure
2022-11-10 18:15:37 +01:00
debugfs
debugfs: fix automount d_fsdata usage
2024-01-25 14:52:27 -08:00
devpts
fsnotify: fix fsnotify hooks in pseudo filesystems
2022-02-01 17:27:01 +01:00
dlm
dlm: fix plock lookup when using multiple lockspaces
2023-09-19 12:22:52 +02:00
ecryptfs
ecryptfs: Reject casefold directory inodes
2024-02-23 08:54:40 +01:00
efivarfs
efivarfs: force RO when remounting if SetVariable is not supported
2024-01-25 14:52:33 -08:00
efs
…
erofs
erofs: apply proper VMA alignment for memory mapped files on THP
2024-03-15 10:48:15 -04:00
exfat
exfat: support dynamic allocate bh for exfat_entry_set_cache
2024-03-01 13:21:56 +01:00
exportfs
exportfs: support idmapped mounts
2022-06-09 10:23:32 +02:00
ext2
ext2: fix datatype of block number in ext2_xattr_set2()
2023-09-23 11:09:57 +02:00
ext4
ext4: avoid bb_free and bb_fragments inconsistency in mb_free_blocks()
2024-03-01 13:22:00 +01:00
f2fs
f2fs: write checkpoint during FG_GC
2024-03-01 13:21:53 +01:00
fat
fat: add ratelimit to fat*_ent_bread()
2022-06-09 10:22:42 +02:00
freevxfs
…
fscache
fscache: Remove an unused static variable
2021-10-04 22:13:12 +01:00
fuse
fuse: share lookup state between submount and its parent
2024-01-05 15:13:36 +01:00
gfs2
gfs2: Fix kernel NULL pointer dereference in gfs2_rgrp_dump
2024-01-25 14:52:35 -08:00
hfs
hfs: fix missing hfs_bnode_get() in __hfs_bnode_create
2023-03-10 09:39:57 +01:00
hfsplus
fs: hfsplus: remove WARN_ON() from hfsplus_cat_{read,write}_inode()
2023-05-24 17:36:43 +01:00
hostfs
hostfs: support splice_write
2021-08-26 22:28:02 +02:00
hpfs
…
hugetlbfs
fs,hugetlb: fix NULL pointer dereference in hugetlbs_fill_super
2024-03-06 14:38:50 +00:00
iomap
iomap: update ki_pos a little later in iomap_dio_complete
2023-12-08 08:48:05 +01:00
isofs
isofs: Fix out of bound access for corrupted isofs image
2021-11-12 15:05:50 +01:00
jbd2
jbd2: fix soft lockup in journal_finish_inode_data_buffers()
2024-01-25 14:52:29 -08:00
jffs2
jffs2: reduce stack usage in jffs2_build_xattr_subsystem()
2023-07-23 13:47:34 +02:00
jfs
jfs: fix array-index-out-of-bounds in diNewExt
2024-02-23 08:54:39 +01:00
kernfs
fs/kernfs/dir: obey S_ISGID
2024-02-23 08:54:51 +01:00
ksmbd
ksmbd: free aux buffer if ksmbd_iov_pin_rsp_read fails
2024-03-01 13:21:48 +01:00
lockd
fs: lockd: avoid possible wrong NULL parameter
2023-09-19 12:22:43 +02:00
minix
minix: fix bug when opening a file with O_DIRECT
2022-04-13 20:59:10 +02:00
netfs
netfs: fix parameter of cleanup()
2021-12-29 12:28:59 +01:00
nfs
NFSv4.1/pnfs: Ensure we handle the error NFS4ERR_RETURNCONFLICT
2024-01-25 14:52:36 -08:00
nfs_common
nfs: Fix kerneldoc warning shown up by W=1
2021-10-04 22:02:17 +01:00
nfsd
nfsd: fix file memleak on client_opens_release
2023-11-28 16:56:34 +00:00
nilfs2
nilfs2: replace WARN_ONs for invalid DAT metadata block requests
2024-02-23 08:55:14 +01:00
nls
fs/nls: make load_nls() take a const parameter
2023-09-19 12:22:27 +02:00
notify
fanotify: disallow mount/sb marks on kernel internal pseudo fs
2023-07-23 13:47:36 +02:00
ntfs
ntfs: check overflow when iterating ATTR_RECORDs
2022-11-26 09:24:52 +01:00
ntfs3
fs/ntfs3: Fix oob in ntfs_listxattr
2024-03-01 13:21:47 +01:00
ocfs2
fs: ocfs2: namei: check return value of ocfs2_add_entry()
2023-09-19 12:22:34 +02:00
omfs
…
openpromfs
…
orangefs
orangefs: Fix kmemleak in orangefs_{kernel,client}_debug_init()
2022-12-31 13:14:44 +01:00
overlayfs
ima: detect changes to the backing overlay file
2023-11-28 16:56:29 +00:00
proc
fs/proc: do_task_stat: move thread_group_cputime_adjusted() outside of lock_task_sighand()
2024-03-15 10:48:22 -04:00
pstore
pstore/ram: Fix crash when setting number of cpus to an odd number
2024-02-23 08:54:39 +01:00
qnx4
qnx4: work around gcc false positive warning bug
2021-09-21 08:36:48 -07:00
qnx6
…
quota
quota: explicitly forbid quota files from being encrypted
2023-11-28 16:56:31 +00:00
ramfs
shmem: use ramfs_kill_sb() for kill_sb method of ramfs-based tmpfs
2023-07-23 13:47:33 +02:00
reiserfs
reiserfs: Check the return value from __getblk()
2023-09-19 12:22:30 +02:00
romfs
…
smbfs_common
cifs: Fix crash on unload of cifs_arc4.ko
2021-12-14 10:57:12 +01:00
squashfs
revert "squashfs: harden sanity check in squashfs_read_xattr_id_table"
2023-02-22 12:57:07 +01:00
sysfs
…
sysv
fs/sysv: Null check to prevent null-ptr-deref bug
2023-08-11 15:13:58 +02:00
tracefs
tracefs: Add missing lockdown check to tracefs_create_dir()
2023-09-23 11:10:02 +02:00
ubifs
ubifs: ubifs_symlink: Fix memleak of inode->i_link in error path
2024-02-23 08:54:26 +01:00
udf
udf: initialize newblock to 0
2023-09-19 12:22:53 +02:00
ufs
…
unicode
…
vboxsf
vboxfs: fix broken legacy mount signature checking
2021-09-27 11:26:21 -07:00
verity
fsverity: skip PKCS#7 parser when keyring is empty
2023-09-19 12:22:52 +02:00
xfs
xfs: read only mounts with fsopen mount API are busted
2024-02-23 08:54:32 +01:00
zonefs
zonefs: Improve error handling
2024-03-01 13:21:43 +01:00
aio.c
fs/aio: Restrict kiocb_set_cancel_fn() to I/O submitted via libaio
2024-03-01 13:22:00 +01:00
anon_inodes.c
…
attr.c
attr: block mode changes of symlinks
2023-09-23 11:10:01 +02:00
bad_inode.c
…
binfmt_aout.c
binfmt: a.out: Fix bogus semicolon
2021-09-05 10:15:05 -07:00
binfmt_elf_fdpic.c
fs: binfmt_elf_efpic: fix personality for ELF-FDPIC
2023-10-06 13:18:24 +02:00
binfmt_elf.c
fs/binfmt_elf: Fix memory leak in load_elf_binary()
2022-11-03 23:59:12 +09:00
binfmt_flat.c
binfmt_flat: do not stop relocating GOT entries prematurely on riscv
2022-06-09 10:22:26 +02:00
binfmt_misc.c
binfmt_misc: fix shift-out-of-bounds in check_special_flags
2022-12-31 13:14:39 +01:00
binfmt_script.c
…
buffer.c
mm: fs: initialize fsdata passed to write_begin/write_end interface
2022-11-26 09:24:51 +01:00
char_dev.c
chardev: fix error handling in cdev_device_add()
2022-12-31 13:14:30 +01:00
compat_binfmt_elf.c
…
coredump.c
coredump: Use the vma snapshot in fill_files_note
2022-04-08 14:24:18 +02:00
d_path.c
d_path: make 'prepend()' fill up the buffer exactly on overflow
2021-09-02 10:07:29 -07:00
dax.c
fsdax: Fix infinite loop in dax_iomap_rw()
2022-09-28 11:11:56 +02:00
dcache.c
fast_dput(): handle underflows gracefully
2024-02-23 08:54:46 +01:00
direct-io.c
…
drop_caches.c
fs: drop_caches: fix skipping over shadow cache inodes
2021-09-03 09:58:10 -07:00
eventfd.c
eventfd: prevent underflow for eventfd semaphores
2023-09-19 12:22:30 +02:00
eventpoll.c
epoll: ep_autoremove_wake_function should use list_del_init_careful
2023-06-21 15:59:14 +02:00
exec.c
exec: Fix error handling in begin_new_exec()
2024-02-23 08:54:31 +01:00
fcntl.c
Merge branch 'akpm' (patches from Andrew)
2021-09-03 10:08:28 -07:00
fhandle.c
do_sys_name_to_handle(): use kzalloc() to fix kernel-infoleak
2024-03-26 18:21:14 -04:00
file_table.c
locks: fix TOCTOU race when granting write lease
2022-10-26 12:34:58 +02:00
file.c
file: reinstate f_pos locking optimization for regular files
2023-08-11 15:13:58 +02:00
filesystems.c
…
fs_context.c
fs: avoid empty option when generating legacy mount string
2023-07-23 13:47:34 +02:00
fs_parser.c
namei: Standardize callers of filename_lookup()
2021-09-07 16:07:47 -04:00
fs_pin.c
…
fs_struct.c
…
fs_types.c
…
fs-writeback.c
writeback, cgroup: switch inodes with dirty timestamps to release dying cgwbs
2023-11-20 11:08:13 +01:00
fsopen.c
…
init.c
…
inode.c
fs: add ctime accessors infrastructure
2023-12-08 08:48:04 +01:00
internal.h
nfs: use vfs setgid helper
2023-08-30 16:18:19 +02:00
ioctl.c
lsm: new security_file_ioctl_compat() hook
2024-02-23 08:54:25 +01:00
Kconfig
ksmbd: have a dependency on cifs ARC4
2024-01-05 15:13:36 +01:00
Kconfig.binfmt
…
kernel_read_file.c
vfs: check fd has read access in kernel_read_file_from_fd()
2021-10-18 20:22:03 -10:00
libfs.c
libfs: add DEFINE_SIMPLE_ATTRIBUTE_SIGNED for signed value
2022-12-31 13:14:03 +01:00
locks.c
locks: fix KASAN: use-after-free in trace_event_raw_event_filelock_lock
2023-09-23 11:09:55 +02:00
Makefile
io_uring: move to separate directory
2022-12-14 11:37:31 +01:00
mbcache.c
mbcache: Avoid nesting of cache->c_list_lock under bit locks
2023-01-12 11:59:20 +01:00
mount.h
…
mpage.c
…
namei.c
rename(): fix the locking of subdirectories
2024-02-23 08:54:26 +01:00
namespace.c
fs: indicate request originates from old mount API
2024-01-25 14:52:35 -08:00
no-block.c
…
nsfs.c
…
open.c
open: make RESOLVE_CACHED correctly test for O_TMPFILE
2023-08-11 15:13:57 +02:00
pipe.c
pipe: wakeup wr_wait after setting max_usage
2024-02-23 08:54:33 +01:00
pnode.c
pnode: terminate at peers of source
2023-01-12 11:58:47 +01:00
pnode.h
…
posix_acl.c
fs: fix acl translation
2022-07-02 16:41:17 +02:00
proc_namespace.c
fs: add is_idmapped_mnt() helper
2022-07-02 16:41:14 +02:00
read_write.c
vfs: fix copy_file_range() averts filesystem freeze protection
2022-12-19 12:36:39 +01:00
readdir.c
…
remap_range.c
fs/remap: constrain dedupe of EOF blocks
2022-07-21 21:24:14 +02:00
select.c
select: Fix indefinitely sleeping task in poll_schedule_timeout()
2022-01-29 10:58:25 +01:00
seq_file.c
rxrpc: Fix locking issue
2022-07-12 16:35:08 +02:00
signalfd.c
signalfd: use wake_up_pollfree()
2021-12-14 10:57:15 +01:00
splice.c
Revert "fs: check FMODE_LSEEK to control internal pipe splicing"
2022-10-26 12:34:17 +02:00
stack.c
…
stat.c
stat: fix inconsistency between struct stat and struct compat_stat
2022-04-27 14:38:57 +02:00
statfs.c
statfs: enforce statfs[64] structure initialization
2023-05-24 17:36:54 +01:00
super.c
fs: Protect reconfiguration of sb read-write from racing writes
2023-08-11 15:13:58 +02:00
sync.c
vfs: make sync_filesystem return errors from ->sync_fs
2022-04-27 14:38:50 +02:00
timerfd.c
…
userfaultfd.c
userfaultfd: open userfaultfds with O_RDONLY
2022-10-26 12:34:36 +02:00
utimes.c
…
xattr.c
fs: don't audit the capability check in simple_xattr_list()
2022-12-31 13:14:01 +01:00