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Eric Biggers 97c6327f71 fscrypt: use smp_load_acquire() for fscrypt_prepared_key 
Normally smp_store_release() or cmpxchg_release() is paired with
smp_load_acquire().  Sometimes smp_load_acquire() can be replaced with
the more lightweight READ_ONCE().  However, for this to be safe, all the
published memory must only be accessed in a way that involves the
pointer itself.  This may not be the case if allocating the object also
involves initializing a static or global variable, for example.

fscrypt_prepared_key includes a pointer to a crypto_skcipher object,
which is internal to and is allocated by the crypto subsystem.  By using
READ_ONCE() for it, we're relying on internal implementation details of
the crypto subsystem.

Remove this fragile assumption by using smp_load_acquire() instead.

(Note: I haven't seen any real-world problems here.  This change is just
fixing the code to be guaranteed correct and less fragile.)

Fixes: 5fee36095cda ("fscrypt: add inline encryption support")
Cc: Satya Tangirala <satyat@google.com>
Link: https://lore.kernel.org/r/20200721225920.114347-3-ebiggers@kernel.org
Signed-off-by: Eric Biggers <ebiggers@google.com>
2020-07-21 16:02:13 -07:00
..
9p
9p: read only once on O_NONBLOCK
2020-03-27 09:29:56 +00:00
adfs
docs: filesystems: fix renamed references
2020-04-20 15:45:22 -06:00
affs
docs: filesystems: fix renamed references
2020-04-20 15:45:22 -06:00
afs
afs: Fix storage of cell names
2020-06-27 22:04:24 -07:00
autofs
LOOKUP_MOUNTPOINT: fold path_mountpointat() into path_lookupat()
2020-03-13 21:08:17 -04:00
befs
…
bfs
docs: filesystems: fix renamed references
2020-04-20 15:45:22 -06:00
btrfs
for-5.8-rc2-tag
2020-06-23 09:20:11 -07:00
cachefiles
A fair amount of stuff this time around, dominated by yet another massive
2020-06-01 15:45:27 -07:00
ceph
ceph: skip checking caps when session reconnecting and releasing reqs
2020-06-01 13:22:53 +02:00
cifs
cifs: prevent truncation from long to int in wait_for_free_credits
2020-07-01 20:01:26 -05:00
coda
docs: filesystems: convert coda.txt to ReST
2020-05-05 09:22:21 -06:00
configfs
A fair amount of stuff this time around, dominated by yet another massive
2020-06-01 15:45:27 -07:00
cramfs
docs: filesystems: fix renamed references
2020-04-20 15:45:22 -06:00
crypto
fscrypt: use smp_load_acquire() for fscrypt_prepared_key
2020-07-21 16:02:13 -07:00
debugfs
Merge 5.7-rc3 into driver-core-next
2020-04-27 09:34:55 +02:00
devpts
…
dlm
dlm for 5.8
2020-06-05 16:43:16 -07:00
ecryptfs
A fair amount of stuff this time around, dominated by yet another massive
2020-06-01 15:45:27 -07:00
efivarfs
efivarfs: Don't return -EINTR when rate-limiting reads
2020-06-15 14:38:56 +02:00
efs
…
erofs
erofs: fix partially uninitialized misuse in z_erofs_onlinepage_fixup
2020-06-24 09:47:44 +08:00
exfat
exfat: flush dirty metadata in fsync
2020-06-29 17:11:18 +09:00
exportfs
race in exportfs_decode_fh()
2019-11-11 09:21:59 -05:00
ext2
mmap locking API: convert mmap_sem comments
2020-06-09 09:39:14 -07:00
ext4
ext4: add inline encryption support
2020-07-08 10:29:43 -07:00
f2fs
f2fs: add inline encryption support
2020-07-08 10:29:43 -07:00
fat
fat: improve the readahead for FAT entries
2020-06-04 19:06:25 -07:00
freevxfs
…
fscache
Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next
2020-06-03 16:27:18 -07:00
fuse
fuse update for 5.8
2020-06-09 15:48:24 -07:00
gfs2
gfs2: The freeze glock should never be frozen
2020-07-03 12:05:35 +02:00
hfs
for-5.8/block-2020-06-01
2020-06-02 15:29:19 -07:00
hfsplus
block: remove the error_sector argument to blkdev_issue_flush
2020-05-22 08:45:46 -06:00
hostfs
hostfs: Use kasprintf() instead of fixed buffer formatting
2020-03-29 23:23:00 +02:00
hpfs
hpfs: fix warning due to superfluous semicolon
2020-06-06 10:08:17 -07:00
hugetlbfs
mmap locking API: convert mmap_sem API comments
2020-06-09 09:39:14 -07:00
iomap
New code for 5.8:
2020-06-13 12:44:30 -07:00
isofs
for-5.8/block-2020-06-01
2020-06-02 15:29:19 -07:00
jbd2
This is the second round of ext4 commits for 5.8 merge window. It
2020-06-15 09:32:10 -07:00
jffs2
jffs2: Replace zero-length array with flexible-array
2020-06-15 23:08:31 -05:00
jfs
Replace zero-length array in JFS
2020-06-02 20:11:35 -07:00
kernfs
mmap locking API: convert mmap_sem comments
2020-06-09 09:39:14 -07:00
lockd
proc: convert everything to "struct proc_ops"
2020-02-04 03:05:26 +00:00
minix
…
nfs
NFSv4 fix CLOSE not waiting for direct IO compeletion
2020-06-26 08:43:14 -04:00
nfs_common
…
nfsd
nfsd: fix nfsdfs inode reference count leak
2020-06-29 14:48:28 -04:00
nilfs2
nilfs2: fix null pointer dereference at nilfs_segctor_do_construct()
2020-06-10 19:14:17 -07:00
nls
treewide: replace '---help---' in Kconfig files with 'help'
2020-06-14 01:57:21 +09:00
notify
treewide: replace '---help---' in Kconfig files with 'help'
2020-06-14 01:57:21 +09:00
ntfs
Merge branch 'akpm' (patches from Andrew)
2020-06-02 12:21:36 -07:00
ocfs2
ocfs2: fix value of OCFS2_INVALID_SLOT
2020-06-26 00:27:37 -07:00
omfs
fs: convert mpage_readpages to mpage_readahead
2020-06-02 10:59:07 -07:00
openpromfs
…
orangefs
orangefs: a conversion and a cleanup...
2020-06-05 16:44:36 -07:00
overlayfs
overlayfs update for 5.8
2020-06-09 15:40:50 -07:00
proc
Merge branch 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2020-07-03 23:20:14 -07:00
pstore
Merge branch 'uaccess.__copy_from_user' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2020-06-01 16:18:46 -07:00
qnx4
…
qnx6
fs: convert mpage_readpages to mpage_readahead
2020-06-02 10:59:07 -07:00
quota
sysctl: pass kernel pointers to ->proc_handler
2020-04-27 02:07:40 -04:00
ramfs
fs_parse: fold fs_parameter_desc/fs_parameter_spec
2020-02-07 14:48:37 -05:00
reiserfs
\n
2020-06-04 13:53:10 -07:00
romfs
treewide: replace '---help---' in Kconfig files with 'help'
2020-06-14 01:57:21 +09:00
squashfs
Squashfs: Replace zero-length array with flexible-array
2020-06-15 23:08:32 -05:00
sysfs
RDMA 5.8 merge window pull request
2020-06-05 14:05:57 -07:00
sysv
docs: filesystems: fix renamed references
2020-04-20 15:45:22 -06:00
tracefs
simple_recursive_removal(): kernel-side rm -rf for ramfs-style filesystems
2019-12-10 22:29:58 -05:00
ubifs
mm: remove the pgprot argument to __vmalloc
2020-06-02 10:59:11 -07:00
udf
for-5.8/block-2020-06-01
2020-06-02 15:29:19 -07:00
ufs
…
unicode
.gitignore: add SPDX License Identifier
2020-03-25 11:50:48 +01:00
vboxsf
vboxsf: don't use the source name in the bdi name
2020-05-07 08:45:47 -06:00
verity
fs-verity: remove unnecessary extern keywords
2020-05-12 16:44:00 -07:00
xfs
xfs: fix use-after-free on CIL context on shutdown
2020-06-22 19:22:57 -07:00
zonefs
zonefs changes for 5.8
2020-06-04 13:50:13 -07:00
aio.c
aio: Replace zero-length array with flexible-array
2020-06-15 23:08:25 -05:00
anon_inodes.c
…
attr.c
utimes: Clamp the timestamps in notify_change()
2019-12-08 19:10:50 -05:00
bad_inode.c
fs: move the fiemap definitions out of fs.h
2020-06-03 23:16:55 -04:00
binfmt_aout.c
exec: Rename flush_old_exec begin_new_exec
2020-05-07 16:55:47 -05:00
binfmt_elf_fdpic.c
Merge branch 'uaccess.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2020-06-10 16:02:54 -07:00
binfmt_elf.c
Merge branch 'uaccess.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2020-06-10 16:02:54 -07:00
binfmt_em86.c
Merge branch 'akpm' (patches from Andrew)
2020-06-04 19:18:29 -07:00
binfmt_flat.c
Merge branch 'uaccess.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2020-06-10 16:02:54 -07:00
binfmt_misc.c
Merge branch 'akpm' (patches from Andrew)
2020-06-04 19:18:29 -07:00
binfmt_script.c
Merge branch 'akpm' (patches from Andrew)
2020-06-04 19:18:29 -07:00
block_dev.c
block: make function 'kill_bdev' static
2020-06-18 09:24:35 -06:00
buffer.c
ext4: add inline encryption support
2020-07-08 10:29:43 -07:00
char_dev.c
vfs: allow unprivileged whiteout creation
2020-05-14 16:44:23 +02:00
compat_binfmt_elf.c
Split the old READ_IMPLIES_EXEC workaround from executable PT_GNU_STACK
2020-06-05 13:45:21 -07:00
compat.c
…
coredump.c
mmap locking API: convert mmap_sem comments
2020-06-09 09:39:14 -07:00
d_path.c
…
dax.c
dax,iomap: Add helper dax_iomap_zero() to zero a range
2020-04-02 19:15:03 -07:00
dcache.c
Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next
2020-06-03 16:27:18 -07:00
dcookies.c
…
direct-io.c
for-5.8-part2-tag
2020-06-14 09:47:25 -07:00
drop_caches.c
sysctl: pass kernel pointers to ->proc_handler
2020-04-27 02:07:40 -04:00
eventfd.c
eventfd: convert to f_op->read_iter()
2020-05-06 22:33:43 -04:00
eventpoll.c
epoll: call final ep_events_available() check under the lock
2020-05-14 10:00:35 -07:00
exec.c
mmap locking API: convert mmap_sem comments
2020-06-09 09:39:14 -07:00
fcntl.c
fcntl: Distribute switch variables for initialization
2020-03-03 10:55:06 -05:00
fhandle.c
…
file_table.c
Revert "fs: Do not check if there is a fsnotify watcher on pseudo inodes"
2020-06-29 09:40:55 -07:00
file.c
fix multiplication overflow in copy_fdtable()
2020-05-19 18:29:36 -04:00
filesystems.c
fs/filesystems.c: downgrade user-reachable WARN_ONCE() to pr_warn_once()
2020-04-10 15:36:22 -07:00
fs_context.c
vfs: don't parse "silent" option
2020-05-14 16:44:25 +02:00
fs_parser.c
fs_parse: remove pr_notice() about each validation
2020-04-02 09:35:26 -07:00
fs_pin.c
…
fs_struct.c
…
fs_types.c
…
fs-writeback.c
A lot of bug fixes and cleanups for ext4, including:
2020-06-05 16:19:28 -07:00
fsopen.c
add prefix to fs_context->log
2020-02-07 14:48:35 -05:00
inode.c
AFS Changes
2020-06-05 16:26:36 -07:00
internal.h
A lot of bug fixes and cleanups for ext4, including:
2020-06-05 16:19:28 -07:00
io_uring.c
io_uring: fix regression with always ignoring signals in io_cqring_wait()
2020-07-04 13:44:45 -06:00
io-wq.c
io_uring: cancel all task's requests on exit
2020-06-15 08:51:34 -06:00
io-wq.h
io_uring: cancel by ->task not pid
2020-06-15 08:51:38 -06:00
ioctl.c
fs: remove the access_ok() check in ioctl_fiemap
2020-06-03 23:16:55 -04:00
Kconfig
treewide: replace '---help---' in Kconfig files with 'help'
2020-06-14 01:57:21 +09:00
Kconfig.binfmt
treewide: replace '---help---' in Kconfig files with 'help'
2020-06-14 01:57:21 +09:00
libfs.c
block: remove the error_sector argument to blkdev_issue_flush
2020-05-22 08:45:46 -06:00
locks.c
Highlights:
2020-06-11 10:33:13 -07:00
Makefile
exfat: add Kconfig and Makefile
2020-03-05 21:00:40 -05:00
mbcache.c
…
mount.h
proc/mounts: add cursor
2020-05-14 16:44:24 +02:00
mpage.c
fs: convert mpage_readpages to mpage_readahead
2020-06-02 10:59:07 -07:00
namei.c
vfs: clean up posix_acl_permission() logic aroudn MAY_NOT_BLOCK
2020-06-08 11:04:19 -07:00
namespace.c
Merge branch 'work.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2020-06-10 16:09:11 -07:00
no-block.c
…
nsfs.c
nsproxy: attach to namespaces via pidfds
2020-05-13 11:41:22 +02:00
open.c
Merge branch 'akpm' (patches from Andrew)
2020-06-02 12:21:36 -07:00
pipe.c
Notifications over pipes + Keyring notifications
2020-06-13 09:56:21 -07:00
pnode.c
propagate_one(): mnt_set_mountpoint() needs mount_lock
2020-04-27 10:37:14 -04:00
pnode.h
…
posix_acl.c
vfs: clean up posix_acl_permission() logic aroudn MAY_NOT_BLOCK
2020-06-08 11:04:19 -07:00
proc_namespace.c
Merge branch 'proc-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace
2020-06-04 13:54:34 -07:00
read_write.c
powerpc: Add back __ARCH_WANT_SYS_LLSEEK macro
2020-04-03 00:09:59 +11:00
readdir.c
readdir.c: get rid of the last __put_user(), drop now-useless access_ok()
2020-05-01 20:29:54 -04:00
select.c
pselect6() and friends: take handling the combined 6th/7th args into helper
2020-05-29 19:10:42 -04:00
seq_file.c
fs/seq_file.c: seq_read: Update pr_info_ratelimited
2020-06-04 19:06:25 -07:00
signalfd.c
…
splice.c
Notifications over pipes + Keyring notifications
2020-06-13 09:56:21 -07:00
stack.c
sched/rt, fs: Use CONFIG_PREEMPTION
2019-12-08 14:37:36 +01:00
stat.c
New code for 5.8:
2020-06-02 19:45:12 -07:00
statfs.c
…
super.c
Merge branch 'work.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2020-06-10 16:09:11 -07:00
sync.c
overlayfs update for 5.8
2020-06-09 15:40:50 -07:00
timerfd.c
timerfd: Make timerfd_settime() time namespace aware
2020-01-14 12:20:53 +01:00
userfaultfd.c
mmap locking API: convert mmap_sem comments
2020-06-09 09:39:14 -07:00
utimes.c
utimensat: AT_EMPTY_PATH support
2020-05-14 16:44:24 +02:00
xattr.c
xattr: fix uninitialized out-param
2020-04-09 15:33:09 -04:00