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635bc4def026a24e071436f4f356ea08c0eed6ff
linux/fs
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Amir Goldstein 635bc4def0 fsnotify: do not generate ACCESS/MODIFY events on child for special files 
inotify/fanotify do not allow users with no read access to a file to
subscribe to events (e.g. IN_ACCESS/IN_MODIFY), but they do allow the
same user to subscribe for watching events on children when the user
has access to the parent directory (e.g. /dev).

Users with no read access to a file but with read access to its parent
directory can still stat the file and see if it was accessed/modified
via atime/mtime change.

The same is not true for special files (e.g. /dev/null). Users will not
generally observe atime/mtime changes when other users read/write to
special files, only when someone sets atime/mtime via utimensat().

Align fsnotify events with this stat behavior and do not generate
ACCESS/MODIFY events to parent watchers on read/write of special files.
The events are still generated to parent watchers on utimensat(). This
closes some side-channels that could be possibly used for information
exfiltration [1].

[1] https://snee.la/pdf/pubs/file-notification-attacks.pdf

Reported-by: Sudheendra Raghav Neela <sneela@tugraz.at>
CC: stable@vger.kernel.org
Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Jan Kara <jack@suse.cz>
2025-12-15 10:18:46 +01:00
..
9p
Revert "fs/9p: Refresh metadata in d_revalidate for uncached mode too"
2025-10-22 14:25:27 +09:00
adfs
Merge tag 'vfs-6.17-rc1.mmap_prepare' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs
2025-07-28 13:43:25 -07:00
affs
Merge tag 'vfs-6.17-rc1.mmap_prepare' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs
2025-07-28 13:43:25 -07:00
afs
afs: Fix uninit var in afs_alloc_anon_key()
2025-11-28 16:48:18 -08:00
autofs
new helper: set_default_d_op()
2025-06-10 22:21:16 -04:00
befs
…
bfs
bfs: Reconstruct file type when loading from disk
2025-10-29 14:39:34 +01:00
btrfs
Merge tag 'for-6.18-rc5-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux
2025-11-11 10:13:17 -08:00
cachefiles
VFS: unify old_mnt_idmap and new_mnt_idmap in renamedata
2025-09-23 12:37:35 +02:00
ceph
libceph: drop started parameter of __ceph_open_session()
2025-11-26 23:29:11 +01:00
coda
Merge tag 'vfs-6.17-rc1.mmap_prepare' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs
2025-07-28 13:43:25 -07:00
configfs
Merge tag 'pull-f_path' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2025-10-03 16:32:36 -07:00
cramfs
Merge tag 'mm-nonmm-stable-2025-10-02-15-29' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
2025-10-02 18:44:54 -07:00
crypto
fscrypt: fix left shift underflow when inode->i_blkbits > PAGE_SHIFT
2025-11-04 16:37:38 -08:00
debugfs
Merge tag 'vfs-6.18-rc1.async' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs
2025-09-29 11:55:15 -07:00
devpts
devpts, sunrpc, hostfs: don't bother with ->d_op
2025-06-11 13:40:04 -04:00
dlm
Merge tag 'dlm-6.18' of git://git.kernel.org/pub/scm/linux/kernel/git/teigland/linux-dlm
2025-09-29 15:24:58 -07:00
ecryptfs
Merge tag 'pull-mount' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2025-10-03 10:19:44 -07:00
efivarfs
power: always freeze efivarfs
2025-11-12 10:12:39 +01:00
efs
…
erofs
erofs: avoid infinite loop due to incomplete zstd-compressed data
2025-11-07 04:10:45 +08:00
exfat
Merge tag 'vfs-6.18-rc7.fixes' of gitolite.kernel.org:pub/scm/linux/kernel/git/vfs/vfs
2025-11-17 09:11:27 -08:00
exportfs
exportfs: use lookup_one_unlocked()
2025-06-11 13:44:15 +02:00
ext2
Merge tag 'fs_for_v6.17-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs
2025-07-28 16:16:09 -07:00
ext4
Merge tag 'ext4_for_linus-6.18-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4
2025-10-15 07:51:57 -07:00
f2fs
f2fs: fix wrong block mapping for multi-devices
2025-10-13 23:55:44 +00:00
fat
vfat: fix missing sb_min_blocksize() return value checks
2025-11-05 14:00:16 +01:00
freevxfs
…
fuse
virtio-fs: fix incorrect check for fsvq->kobj
2025-11-05 14:00:16 +01:00
gfs2
Merge tag 'pull-finish_no_open' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2025-10-03 10:59:31 -07:00
hfs
hfs/hfsplus: rework debug output subsystem
2025-09-24 16:30:34 -07:00
hfsplus
hfs/hfsplus: rework debug output subsystem
2025-09-24 16:30:34 -07:00
hostfs
hostfs: Fix only passing host root in boot stage with new mount
2025-10-21 14:22:42 +02:00
hpfs
Merge tag 'for-6.18/hpfs-changes' of git://git.kernel.org/pub/scm/linux/kernel/git/device-mapper/linux-dm
2025-10-10 14:06:02 -07:00
hugetlbfs
hugetlbfs: move lock assertions after early returns in huge_pmd_unshare()
2025-10-21 15:46:17 -07:00
iomap
iomap: open code bio_iov_iter_get_bdev_pages
2025-10-07 08:05:44 -06:00
isofs
isofs: check the return value of sb_min_blocksize() in isofs_fill_super
2025-11-05 14:00:16 +01:00
jbd2
jbd2: ensure that all ongoing I/O complete before freeing blocks
2025-10-10 13:10:06 -04:00
jffs2
mm: introduce memdesc_flags_t
2025-09-13 16:55:07 -07:00
jfs
Merge tag 'jfs-6.18' of github.com:kleikamp/linux-shaggy
2025-10-03 13:54:23 -07:00
kernfs
Merge tag 'vfs-6.18-rc1.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs
2025-09-29 09:03:07 -07:00
lockd
SUNRPC: Move the svc_rpcb_cleanup() call sites
2025-09-23 13:28:19 -04:00
minix
minixfs: Verify inode mode when loading from disk
2025-08-19 13:30:46 +02:00
netfs
Merge tag 'vfs-6.18-rc1.workqueue' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs
2025-09-29 10:27:17 -07:00
nfs
NFS: Fix LTP test failures when timestamps are delegated
2025-11-10 16:55:12 -05:00
nfs_common
NFS/localio: nfs_uuid_put() fix the wake up after unlinking the file
2025-08-05 16:45:40 -07:00
nfsd
Merge tag 'nfsd-6.18-3' of git://git.kernel.org/pub/scm/linux/kernel/git/cel/linux
2025-11-12 18:41:01 -08:00
nilfs2
nilfs2: avoid having an active sc_timer before freeing sci
2025-11-09 21:19:46 -08:00
nls
…
notify
fsnotify: do not generate ACCESS/MODIFY events on child for special files
2025-12-15 10:18:46 +01:00
ntfs3
ntfs3: stop using write_cache_pages
2025-09-13 16:55:13 -07:00
ocfs2
ocfs2: clear extent cache after moving/defragmenting extents
2025-10-15 13:24:33 -07:00
omfs
Merge tag 'vfs-6.17-rc1.mmap_prepare' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs
2025-07-28 13:43:25 -07:00
openpromfs
…
orangefs
Merge tag 'for-linus-6.18-ofs1' of git://git.kernel.org/pub/scm/linux/kernel/git/hubcap/linux
2025-10-03 13:59:56 -07:00
overlayfs
ovl: fail ovl_lock_rename_workdir() if either target is unhashed
2025-11-28 10:42:32 +01:00
proc
fs/proc: fix uaf in proc_readdir_de()
2025-11-09 21:19:43 -08:00
pstore
Merge tag 'pstore-v6.18-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux
2025-09-29 18:08:34 -07:00
qnx4
…
qnx6
…
quota
fs: replace use of system_unbound_wq with system_dfl_wq
2025-09-19 16:15:07 +02:00
ramfs
fs: rename generic_delete_inode() and generic_drop_inode()
2025-09-15 16:09:42 +02:00
resctrl
x86,fs/resctrl: Fix NULL pointer dereference with events force-disabled in mbm_event mode
2025-10-20 18:06:31 +02:00
romfs
fs: replace mmap hook with .mmap_prepare for simple mappings
2025-06-19 13:56:59 +02:00
smb
smb: client: fix memory leak in cifs_construct_tcon()
2025-11-25 18:00:06 -06:00
squashfs
Merge tag 'mm-nonmm-stable-2025-10-02-15-29' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
2025-10-02 18:44:54 -07:00
sysfs
sysfs: check visibility before changing group attribute ownership
2025-10-17 09:48:34 +02:00
tests
…
tracefs
Merge tag 'pull-rpc_pipefs' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2025-07-28 09:56:09 -07:00
ubifs
Merge tag 'mm-stable-2025-10-01-19-00' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
2025-10-02 18:18:33 -07:00
udf
fs: udf: fix OOB read in lengthAllocDescs handling
2025-09-22 15:33:56 +02:00
ufs
Merge tag 'vfs-6.17-rc1.mmap_prepare' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs
2025-07-28 13:43:25 -07:00
unicode
…
vboxsf
simplify vboxsf_dir_atomic_open()
2025-09-16 23:59:38 -04:00
verity
Merge tag 'fsverity-for-linus' of git://git.kernel.org/pub/scm/fs/fsverity/linux
2025-09-29 15:55:20 -07:00
xfs
Merge tag 'xfs-fixes-6.18-rc7' of git://git.kernel.org/pub/scm/fs/xfs/xfs-linux
2025-11-22 10:23:34 -08:00
zonefs
zonefs: correct some spelling mistakes
2025-08-12 11:59:27 +09:00
aio.c
Merge tag 'mm-stable-2025-10-01-19-00' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
2025-10-02 18:18:33 -07:00
anon_inodes.c
module: Rename EXPORT_SYMBOL_GPL_FOR_MODULES to EXPORT_SYMBOL_FOR_MODULES
2025-08-11 16:16:36 +02:00
attr.c
vfs: add ATTR_CTIME_SET flag
2025-09-21 19:24:50 -04:00
backing-file.c
Merge tag 'vfs-6.17-rc1.mmap_prepare' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs
2025-07-28 13:43:25 -07:00
bad_inode.c
…
binfmt_elf_fdpic.c
Merge tag 'execve-v6.17' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux
2025-07-28 17:11:40 -07:00
binfmt_elf.c
binfmt_elf: preserve original ELF e_flags for core dumps
2025-09-03 20:49:32 -07:00
binfmt_flat.c
…
binfmt_misc.c
binfmt_misc: restore write access before closing files opened by open_exec()
2025-11-05 14:00:16 +01:00
binfmt_script.c
…
bpf_fs_kfuncs.c
bpf...d_path(): constify path argument
2025-09-15 21:17:08 -04:00
buffer.c
fs/buffer: fix use-after-free when call bh_read() helper
2025-08-19 13:51:28 +02:00
char_dev.c
…
compat_binfmt_elf.c
…
coredump.c
coredump: fix core_pattern input validation
2025-10-07 13:12:46 +02:00
d_path.c
fold fs_struct->{lock,seq} into a seqlock
2025-07-08 10:25:19 +02:00
dax.c
dax: skip read lock assertion for read-only filesystems
2025-10-07 12:48:33 +02:00
dcache.c
vfs: Don't leak disconnected dentries on umount
2025-10-07 13:09:08 +02:00
direct-io.c
Merge tag 'mm-stable-2025-07-30-15-25' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
2025-07-31 14:57:54 -07:00
drop_caches.c
…
eventfd.c
…
eventpoll.c
eventpoll: Replace rwlock with spinlock
2025-09-05 15:51:24 +02:00
exec.c
coredump: fix core_pattern input validation
2025-10-07 13:12:46 +02:00
fcntl.c
fcntl: trim arguments
2025-09-26 10:21:23 +02:00
fhandle.c
Merge tag 'namespace-6.18-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs
2025-09-29 11:20:29 -07:00
file_attr.c
fs: return EOPNOTSUPP from file_setattr/file_getattr syscalls
2025-10-10 13:46:00 +02:00
file_table.c
fs: update comment in init_file()
2025-10-07 12:48:33 +02:00
file.c
fs: always return zero on success from replace_fd()
2025-08-11 14:52:25 +02:00
filesystems.c
fs/filesystems: Fix potential unsigned integer underflow in fs_name()
2025-04-14 13:05:59 +02:00
fs_context.c
change the calling conventions for vfs_parse_fs_string()
2025-09-04 15:20:51 -04:00
fs_parser.c
fs/fs_parse: Remove unused and problematic validate_constant_table()
2025-04-21 10:27:59 +02:00
fs_pin.c
…
fs_struct.c
fold fs_struct->{lock,seq} into a seqlock
2025-07-08 10:25:19 +02:00
fs_types.c
…
fs-writeback.c
Merge tag 'vfs-6.18-rc1.writeback' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs
2025-09-29 11:34:40 -07:00
fsopen.c
fscontext: do not consume log entries when returning -EMSGSIZE
2025-08-11 14:52:41 +02:00
init.c
VFS: rename kern_path_locked() and related functions.
2025-09-23 12:37:36 +02:00
inode.c
fs: add iput_not_last()
2025-11-12 10:47:42 +01:00
internal.h
Merge tag 'pull-f_path' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2025-10-03 16:32:36 -07:00
ioctl.c
fs: remove vfs_ioctl export
2025-09-01 13:08:01 +02:00
Kconfig
Merge tag 'mm-stable-2025-10-01-19-00' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
2025-10-02 18:18:33 -07:00
Kconfig.binfmt
binfmt_elf: preserve original ELF e_flags for core dumps
2025-09-03 20:49:32 -07:00
kernel_read_file.c
…
libfs.c
Merge tag 'vfs-6.17-rc1.pidfs' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs
2025-07-28 14:10:15 -07:00
locks.c
locks: Remove the last reference to EXPORT_OP_ASYNC_LOCK.
2025-08-11 14:52:24 +02:00
Makefile
Remove bcachefs core code
2025-09-29 13:43:52 -07:00
mbcache.c
…
mnt_idmapping.c
…
mount.h
Merge tag 'pull-mount' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2025-10-03 10:19:44 -07:00
mpage.c
mpage: convert do_mpage_readpage() to return void type
2025-09-21 14:22:16 -07:00
namei.c
Merge tag 'pull-f_path' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2025-10-03 16:32:36 -07:00
namespace.c
fs/namespace: fix reference leak in grab_requested_mnt_ns
2025-11-25 09:34:56 +01:00
nsfs.c
nsfs: handle inode number mismatches gracefully in file handles
2025-10-07 12:48:33 +02:00
open.c
Merge tag 'pull-f_path' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2025-10-03 16:32:36 -07:00
pidfs.c
Merge tag 'pull-f_path' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2025-10-03 16:32:36 -07:00
pipe.c
Add RWF_NOSIGNAL flag for pwritev2
2025-08-29 15:08:07 +02:00
pnode.c
umount_tree(): take all victims out of propagation graph at once
2025-09-15 21:26:44 -04:00
pnode.h
umount_tree(): take all victims out of propagation graph at once
2025-09-15 21:26:44 -04:00
posix_acl.c
…
proc_namespace.c
->mnt_devname is never NULL
2025-05-23 14:20:44 +02:00
read_write.c
copy_file_range: limit size if in compat mode
2025-08-15 16:11:47 +02:00
readdir.c
readdir: supply dir_context.count as readdir buffer size hint
2025-05-29 12:31:23 +02:00
remap_range.c
…
select.c
fs: annotate suspected data race between poll_schedule_timeout() and pollwake()
2025-06-23 12:36:51 +02:00
seq_file.c
…
signalfd.c
…
splice.c
netfs: Fix unbuffered write error handling
2025-08-15 15:56:49 +02:00
stack.c
docs/vfs: update references to i_mutex to i_rwsem
2025-06-23 12:17:33 +02:00
stat.c
constify path argument of vfs_statx_path()
2025-09-15 21:17:07 -04:00
statfs.c
…
super.c
power: always freeze efivarfs
2025-11-12 10:12:39 +01:00
sync.c
…
sysctls.c
…
timerfd.c
Merge tag 'timers-cleanups-2025-03-23' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2025-03-25 10:54:15 -07:00
userfaultfd.c
mm/mremap: use an explicit uffd failure path for mremap
2025-07-24 19:12:29 -07:00
utimes.c
…
xattr.c
Merge tag 'vfs-6.17-rc1.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs
2025-07-28 11:22:56 -07:00