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fbdb44013202305cd2aefb01df0a92bb55819702
linux/fs
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Chandan Rajendra fbdb440132 copy_mount_string: Limit string length to PATH_MAX 
On ppc64le, When a string with PAGE_SIZE - 1 (i.e. 64k-1) length is
passed as a "filesystem type" argument to the mount(2) syscall,
copy_mount_string() ends up allocating 64k (the PAGE_SIZE on ppc64le)
worth of space for holding the string in kernel's address space.

Later, in set_precision() (invoked by get_fs_type() ->
__request_module() -> vsnprintf()), we end up assigning
strlen(fs-type-string) i.e. 65535 as the
value to 'struct printf_spec'->precision member. This field has a width
of 16 bits and it is a signed data type. Hence an invalid value ends
up getting assigned. This causes the "WARN_ONCE(spec->precision != prec,
"precision %d too large", prec)" statement inside set_precision() to be
executed.

This commit fixes the bug by limiting the length of the string passed by
copy_mount_string() to strndup_user() to PATH_MAX.

Signed-off-by: Chandan Rajendra <chandan@linux.ibm.com>
Reported-by: Abdul Haleem <abdhalee@linux.ibm.com>
Suggested-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2019-02-01 01:57:33 -05:00
..
9p
Merge branch 'work.afs' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2018-11-01 19:58:52 -07:00
adfs
adfs: use timespec64 for time conversion
2018-08-22 10:52:51 -07:00
affs
affs: fix potential memory leak when parsing option 'prefix'
2018-05-28 12:36:41 +02:00
afs
fs: don't open code lru_to_page()
2019-01-04 13:13:48 -08:00
autofs
autofs: add strictexpire mount option
2019-01-04 13:13:47 -08:00
befs
fix a series of Documentation/ broken file name references
2018-06-15 18:10:01 -03:00
bfs
bfs: extra sanity checking and static inode bitmap
2019-01-04 13:13:47 -08:00
btrfs
Merge tag 'for-5.0-rc1-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux
2019-01-14 05:55:51 +12:00
cachefiles
fscache, cachefiles: remove redundant variable 'cache'
2018-11-30 16:00:58 +00:00
ceph
ceph: use vmf_error() in ceph_filemap_fault()
2019-01-07 22:48:48 +01:00
cifs
cifs: update internal module version number
2019-01-11 07:14:40 -06:00
coda
vfs: change inode times to use struct timespec64
2018-06-05 16:57:31 -07:00
configfs
configfs: fix registered group removal
2018-07-17 06:14:07 -07:00
cramfs
Merge tag 'cramfs_fixes' of git://git.linaro.org/people/nicolas.pitre/linux
2018-10-30 12:46:25 -07:00
crypto
fscrypt: add Adiantum support
2019-01-06 08:36:21 -05:00
debugfs
Revert "debugfs: inode: debugfs_create_dir uses mode permission from parent"
2018-06-12 20:52:16 -07:00
devpts
devpts: Convert to new IDA API
2018-08-21 23:54:17 -04:00
dlm
dlm: fix invalid cluster name warning
2018-12-03 15:30:24 -06:00
ecryptfs
ecryptfs_rename(): verify that lower dentries are still OK after lock_rename()
2018-10-09 23:33:17 -04:00
efivarfs
efivars: Call guid_parse() against guid_t type of variable
2018-07-22 14:13:44 +02:00
efs
Rename superblock flags (MS_xyz -> SB_xyz)
2017-11-27 13:05:09 -08:00
exofs
exofs_mount(): fix leaks on failure exits
2018-12-17 18:36:33 -05:00
exportfs
exportfs: do not read dentry after free
2018-11-23 09:08:17 -05:00
ext2
Merge tag 'fs_for_4.21-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs
2018-12-27 17:00:35 -08:00
ext4
Merge tag 'ext4_for_linus_stable' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4
2019-01-06 12:19:23 -08:00
f2fs
Merge tag 'f2fs-for-4.21' of git://git.kernel.org/pub/scm/linux/kernel/git/jaegeuk/f2fs
2018-12-31 09:41:37 -08:00
fat
Merge branch 'akpm' (patches from Andrew)
2019-01-05 09:16:18 -08:00
freevxfs
freevxfs_lookup(): use d_splice_alias()
2018-05-22 14:27:51 -04:00
fscache
fscache: fix race between enablement and dropping of object
2018-11-30 15:57:31 +00:00
fuse
mm: convert totalram_pages and totalhigh_pages variables to atomic
2018-12-28 12:11:47 -08:00
gfs2
Merge tag 'locks-v4.21-1' of git://git.kernel.org/pub/scm/linux/kernel/git/jlayton/linux
2018-12-27 17:12:30 -08:00
hfs
hfs: do not free node before using
2018-11-30 14:56:14 -08:00
hfsplus
hfsplus: return file attributes on statx
2019-01-04 13:13:47 -08:00
hostfs
vfs: discard ATTR_ATTR_FLAG
2018-08-17 16:20:28 -07:00
hpfs
hpfs: remove unnecessary checks on the value of r when assigning error code
2018-08-25 12:42:33 -07:00
hugetlbfs
hugetlbfs: revert "Use i_mmap_rwsem to fix page fault/truncate race"
2019-01-08 17:15:11 -08:00
isofs
Update email address
2018-09-29 22:47:48 -04:00
jbd2
jbd2: clean up indentation issue, replace spaces with tab
2018-12-04 00:20:10 -05:00
jffs2
jffs2: Fix use of uninitialized delayed_work, lockdep breakage
2018-12-02 09:20:34 +01:00
jfs
jfs: remove redundant dquot_initialize() in jfs_evict_inode()
2018-09-20 09:28:49 -05:00
kernfs
fix cgroup_do_mount() handling of failure exits
2019-01-17 11:52:49 -05:00
lockd
Merge tag 'nfs-for-4.21-1' of git://git.linux-nfs.org/projects/anna/linux-nfs
2019-01-02 16:35:23 -08:00
minix
minix_lookup: use d_splice_alias()
2018-05-22 14:27:52 -04:00
nfs
Merge branch 'mount.part1' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2019-01-05 13:25:58 -08:00
nfs_common
net: Drop pernet_operations::async
2018-03-27 13:18:09 -04:00
nfsd
Merge tag 'nfs-for-4.21-1' of git://git.linux-nfs.org/projects/anna/linux-nfs
2019-01-02 16:35:23 -08:00
nilfs2
nilfs2: Use xa_erase_irq
2018-11-05 14:57:05 -05:00
nls
…
notify
fanotify: Use inode_is_open_for_write
2018-12-11 10:55:45 +01:00
ntfs
mm: convert totalram_pages and totalhigh_pages variables to atomic
2018-12-28 12:11:47 -08:00
ocfs2
Merge branch 'akpm' (patches from Andrew)
2019-01-05 09:16:18 -08:00
omfs
omfs_lookup(): report IO errors, use d_splice_alias()
2018-05-22 14:27:58 -04:00
openpromfs
fs/openpromfs: Use of_node_name_eq for node name comparisons
2018-11-18 13:35:19 -08:00
orangefs
fs: don't open code lru_to_page()
2019-01-04 13:13:48 -08:00
overlayfs
Revert "ovl: relax permission checking on underlying layers"
2018-12-04 11:31:30 +01:00
proc
fs/proc/base.c: slightly faster /proc/*/limits
2019-01-04 13:13:45 -08:00
pstore
Remove 'type' argument from access_ok() function
2019-01-03 18:57:57 -08:00
qnx4
qnx4_lookup: use d_splice_alias()
2018-05-22 14:27:52 -04:00
qnx6
qnx6_lookup: switch to d_splice_alias()
2018-05-22 14:27:54 -04:00
quota
quota: Lock s_umount in exclusive mode for Q_XQUOTA{ON,OFF} quotactls.
2018-12-18 18:29:15 +01:00
ramfs
…
reiserfs
reiserfs: remove workaround code for GCC 3.x
2018-10-31 08:54:14 -07:00
romfs
romfs_lookup: switch to d_splice_alias()
2018-05-22 14:27:55 -04:00
squashfs
Squashfs: Compute expected length from inode size rather than block length
2018-08-02 09:34:02 -07:00
sysfs
sysfs: convert BUG_ON to WARN_ON
2019-01-07 08:53:32 +01:00
sysv
sysv: return 'err' instead of 0 in __sysv_write_inode
2018-11-10 08:02:40 -05:00
tracefs
tracefs: Annotate tracefs_ops with __ro_after_init
2018-07-31 11:32:44 -04:00
ubifs
mm: migrate: drop unused argument of migrate_page_move_mapping()
2018-12-28 12:11:51 -08:00
udf
Merge tag 'fs_for_4.21-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs
2018-12-27 17:00:35 -08:00
ufs
fs/ufs: use ktime_get_real_seconds for sb and cg timestamps
2018-08-17 16:20:27 -07:00
xfs
xfs: xfs_fsops: drop useless LIST_HEAD
2018-12-29 10:47:58 -08:00
aio.c
Merge branch 'akpm' (patches from Andrew)
2018-12-28 16:55:46 -08:00
anon_inodes.c
anon_inode_getfile(): switch to alloc_file_pseudo()
2018-07-12 10:04:27 -04:00
attr.c
fs: Fix attr.c kernel-doc
2018-07-03 16:44:45 -04:00
bad_inode.c
get rid of 'opened' argument of ->atomic_open() - part 3
2018-07-12 10:04:20 -04:00
binfmt_aout.c
Remove 'type' argument from access_ok() function
2019-01-03 18:57:57 -08:00
binfmt_elf_fdpic.c
treewide: kmalloc() -> kmalloc_array()
2018-06-12 16:19:22 -07:00
binfmt_elf.c
signal: Distinguish between kernel_siginfo and siginfo
2018-10-03 16:47:43 +02:00
binfmt_em86.c
…
binfmt_flat.c
exec: introduce finalize_exec() before start_thread()
2018-04-11 10:28:37 -07:00
binfmt_misc.c
turn filp_clone_open() into inline wrapper for dentry_open()
2018-07-10 23:29:03 -04:00
binfmt_script.c
exec: load_script: don't blindly truncate shebang string
2019-01-04 13:13:47 -08:00
block_dev.c
block: don't use un-ordered __set_current_state(TASK_UNINTERRUPTIBLE)
2019-01-02 10:46:03 -08:00
buffer.c
fs/: remove caller signal_pending branch predictions
2019-01-04 13:13:48 -08:00
char_dev.c
block, char_dev: Use correct format specifier for unsigned ints
2018-03-15 17:59:24 +01:00
compat_binfmt_elf.c
y2038: globally rename compat_time to old_time32
2018-08-27 14:48:48 +02:00
compat_ioctl.c
Merge tag 'media/v4.20-1' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-media
2018-10-29 14:29:58 -07:00
compat.c
ncpfs: remove compat functionality
2018-06-05 19:23:26 +02:00
coredump.c
signal: Distinguish between kernel_siginfo and siginfo
2018-10-03 16:47:43 +02:00
d_path.c
split d_path() and friends into a separate file
2018-03-29 15:07:46 -04:00
dax.c
Merge tag 'dax-fix-4.21' of git://git.kernel.org/pub/scm/linux/kernel/git/nvdimm/nvdimm
2018-12-31 09:46:39 -08:00
dcache.c
mm: remove include/linux/bootmem.h
2018-10-31 08:54:16 -07:00
dcookies.c
fs: add do_lookup_dcookie() helper; remove in-kernel call to syscall
2018-04-02 20:15:39 +02:00
direct-io.c
Merge tag 'v4.20-rc5' into for-4.21/block
2018-12-04 09:38:05 -07:00
drop_caches.c
…
eventfd.c
Revert changes to convert to ->poll_mask() and aio IOCB_CMD_POLL
2018-06-28 10:40:47 -07:00
eventpoll.c
Merge branch 'akpm' (patches from Andrew)
2019-01-05 09:16:18 -08:00
exec.c
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2019-01-05 13:18:59 -08:00
fcntl.c
signal: Distinguish between kernel_siginfo and siginfo
2018-10-03 16:47:43 +02:00
fhandle.c
vfs: Copy struct mount.mnt_id to userspace using put_user()
2018-01-15 12:07:51 -08:00
file_table.c
mm: convert totalram_pages and totalhigh_pages variables to atomic
2018-12-28 12:11:47 -08:00
file.c
Merge tag 'char-misc-4.21-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc
2018-12-28 20:54:57 -08:00
filesystems.c
proc: introduce proc_create_single{,_data}
2018-05-16 07:23:35 +02:00
fs_pin.c
Merge branch 'linus' into locking/core, to resolve conflicts
2017-11-07 10:32:44 +01:00
fs_struct.c
…
fs-writeback.c
fs: Convert writeback to XArray
2018-10-21 10:46:42 -04:00
inode.c
Merge tag 'y2038-for-4.21' of ssh://gitolite.kernel.org:/pub/scm/linux/kernel/git/arnd/playground
2018-12-28 12:45:04 -08:00
internal.h
Merge tag 'ovl-update-4.19' of git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/vfs
2018-08-21 18:19:09 -07:00
ioctl.c
Remove 'type' argument from access_ok() function
2019-01-03 18:57:57 -08:00
iomap.c
block: don't use un-ordered __set_current_state(TASK_UNINTERRUPTIBLE)
2019-01-02 10:46:03 -08:00
Kconfig
autofs: remove left-over autofs4 stubs
2018-06-11 08:22:34 -07:00
Kconfig.binfmt
kconfig: move the "Executable file formats" menu to fs/Kconfig.binfmt
2018-08-02 08:06:55 +09:00
libfs.c
fs, dax: prepare for dax-specific address_space_operations
2018-03-30 11:34:55 -07:00
locks.c
locks: fix error in locks_move_blocks()
2019-01-02 20:14:50 -05:00
Makefile
autofs: remove left-over autofs4 stubs
2018-06-11 08:22:34 -07:00
mbcache.c
treewide: kmalloc() -> kmalloc_array()
2018-06-12 16:19:22 -07:00
mount.h
…
mpage.c
mpage: mpage_readpages() should submit IO as read-ahead
2018-08-17 16:20:29 -07:00
namei.c
Revert "vfs: Allow userns root to call mknod on owned filesystems."
2018-12-22 14:18:34 -08:00
namespace.c
copy_mount_string: Limit string length to PATH_MAX
2019-02-01 01:57:33 -05:00
no-block.c
…
nsfs.c
net: Export open_related_ns()
2018-02-15 15:34:42 -05:00
open.c
Merge tag 'ovl-update-4.19' of git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/vfs
2018-08-21 18:19:09 -07:00
pipe.c
Merge branch 'work.open3' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2018-08-13 19:58:36 -07:00
pnode.c
vfs: Suppress MS_* flag defs within the kernel unless explicitly enabled
2018-12-20 16:32:56 +00:00
pnode.h
…
posix_acl.c
posix_acl: convert posix_acl.a_refcount from atomic_t to refcount_t
2018-01-02 19:27:28 -08:00
proc_namespace.c
vfs: do bulk POLL* -> EPOLL* replacement
2018-02-11 14:34:03 -08:00
read_write.c
Remove 'type' argument from access_ok() function
2019-01-03 18:57:57 -08:00
readdir.c
Remove 'type' argument from access_ok() function
2019-01-03 18:57:57 -08:00
select.c
Remove 'type' argument from access_ok() function
2019-01-03 18:57:57 -08:00
seq_file.c
fs/seq_file.c: simplify seq_file iteration code and interface
2018-08-17 16:20:28 -07:00
signalfd.c
signal: Distinguish between kernel_siginfo and siginfo
2018-10-03 16:47:43 +02:00
splice.c
splice: don't read more than available pipe space
2018-12-04 08:50:49 -08:00
stack.c
…
stat.c
y2038: Remove newstat family from default syscall set
2018-08-29 15:42:20 +02:00
statfs.c
kernel: add kcompat_sys_{f,}statfs64()
2018-07-12 14:49:48 +01:00
super.c
mount_fs: suppress MAC on MS_SUBMOUNT as well as MS_KERNMOUNT
2018-12-21 11:51:23 -05:00
sync.c
Merge tag 'xfs-4.17-merge-1' of git://git.kernel.org/pub/scm/fs/xfs/xfs-linux
2018-04-04 12:44:02 -07:00
timerfd.c
y2038: globally rename compat_time to old_time32
2018-08-27 14:48:48 +02:00
userfaultfd.c
userfaultfd: clear flag if remap event not enabled
2018-12-28 12:11:51 -08:00
utimes.c
y2038: utimes: Rework #ifdef guards for compat syscalls
2018-08-29 15:42:23 +02:00
xattr.c
sysfs: Do not return POSIX ACL xattrs via listxattr
2018-09-18 07:30:48 -04:00