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Oleg Nesterov 704b836cbf mm_for_maps: take ->cred_guard_mutex to fix the race with exec 
The problem is minor, but without ->cred_guard_mutex held we can race
with exec() and get the new ->mm but check old creds.

Now we do not need to re-check task->mm after ptrace_may_access(), it
can't be changed to the new mm under us.

Strictly speaking, this also fixes another very minor problem. Unless
security check fails or the task exits mm_for_maps() should never
return NULL, the caller should get either old or new ->mm.

Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Acked-by: Serge Hallyn <serue@us.ibm.com>
Signed-off-by: James Morris <jmorris@namei.org>
2009-08-10 20:49:26 +10:00
..
9p
9p: Fix incorrect parameters to v9fs_file_readn.
2009-07-14 15:54:42 -05:00
adfs
headers: smp_lock.h redux
2009-07-12 12:22:34 -07:00
affs
affs: add ->sync_fs
2009-06-11 21:36:14 -04:00
afs
AFS: Fix compilation warning
2009-07-12 12:24:07 -07:00
autofs
switch follow_down()
2009-06-11 21:36:01 -04:00
autofs4
headers: smp_lock.h redux
2009-07-12 12:22:34 -07:00
befs
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs-2.6
2009-06-17 08:46:57 -07:00
bfs
headers: smp_lock.h redux
2009-07-12 12:22:34 -07:00
btrfs
Merge git://git.kernel.org/pub/scm/linux/kernel/git/mason/btrfs-unstable
2009-08-07 19:03:09 -07:00
cachefiles
enforce ->sync_fs is only called for rw superblock
2009-06-11 21:36:06 -04:00
cifs
[CIFS] Update readme to reflect forceuid mount parms
2009-08-04 03:53:28 +00:00
coda
splice: implement default splice_read method
2009-05-11 14:13:10 +02:00
configfs
configfs: Rework configfs_depend_item() locking and make lockdep happy
2009-04-30 10:48:26 -07:00
cramfs
fs/cramfs: return f_fsid for statfs(2)
2009-04-02 19:05:08 -07:00
debugfs
debugfs: use specified mode to possibly mark files read/write only
2009-06-15 21:30:28 -07:00
devpts
devpts: remove module-related code
2009-06-24 08:15:24 -04:00
dlm
dlm: free socket in error exit path
2009-07-14 12:28:43 -05:00
ecryptfs
eCryptfs: parse_tag_3_packet check tag 3 packet encrypted key size
2009-07-28 14:26:06 -07:00
efs
get rid of BKL in fs/efs
2009-06-17 00:36:36 -04:00
exofs
headers: smp_lock.h redux
2009-07-12 12:22:34 -07:00
exportfs
…
ext2
headers: smp_lock.h redux
2009-07-12 12:22:34 -07:00
ext3
ext3: Get rid of extenddisksize parameter of ext3_get_blocks_handle()
2009-07-15 21:30:46 +02:00
ext4
Merge branch 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4
2009-07-13 16:39:25 -07:00
fat
headers: smp_lock.h redux
2009-07-12 12:22:34 -07:00
freevxfs
headers: smp_lock.h redux
2009-07-12 12:22:34 -07:00
fscache
FS-Cache: Fixup renamed filenames in comments in internal.h
2009-05-27 10:20:13 -07:00
fuse
Revert "fuse: Fix build error" as unnecessary
2009-07-11 11:22:34 -07:00
gfs2
GFS2: remove dcache entries for remote deleted inodes
2009-07-30 11:01:03 +01:00
hfs
headers: smp_lock.h redux
2009-07-12 12:22:34 -07:00
hfsplus
headers: smp_lock.h redux
2009-07-12 12:22:34 -07:00
hostfs
hostfs: set maximum filesize in superblock for proper LFS support
2009-06-30 18:56:03 -07:00
hpfs
headers: smp_lock.h redux
2009-07-12 12:22:34 -07:00
hppfs
hppfs: hppfs_read_file() may return -ERROR
2009-04-02 19:04:53 -07:00
hugetlbfs
Merge branch 'master' into next
2009-05-22 18:40:59 +10:00
isofs
isofs: fix Joliet regression
2009-07-10 19:18:59 -07:00
jbd
jbd: fix race between write_metadata_buffer and get_write_access
2009-07-21 11:54:42 +02:00
jbd2
jbd2: fix race between write_metadata_buffer and get_write_access
2009-07-13 17:55:35 -04:00
jffs2
jffs2: Fix return value from jffs2_do_readpage_nolock()
2009-08-04 12:13:06 +01:00
jfs
jfs: Fix early release of acl in jfs_get_acl
2009-07-23 11:08:36 -05:00
lockd
headers: smp_lock.h redux
2009-07-12 12:22:34 -07:00
minix
Making fs/minix/minix.h double including safe
2009-06-22 11:34:42 -07:00
ncpfs
NLS: update handling of Unicode
2009-06-15 21:44:43 -07:00
nfs
NFSv4: Fix a problem whereby a buggy server can oops the kernel
2009-07-21 19:22:38 -04:00
nfs_common
…
nfsd
headers: smp_lock.h redux
2009-07-12 12:22:34 -07:00
nilfs2
nilfs2: fix missing unlock in error path of nilfs_mdt_write_page
2009-08-02 22:24:15 +09:00
nls
NLS: update handling of Unicode
2009-06-15 21:44:43 -07:00
notify
inotify: use GFP_NOFS under potential memory pressure
2009-07-21 15:26:27 -04:00
ntfs
ntfs: use is_power_of_2() function for clarity.
2009-06-16 19:47:48 -07:00
ocfs2
headers: smp_lock.h redux
2009-07-12 12:22:34 -07:00
omfs
switch omfs to simple_fsync()
2009-06-11 21:36:13 -04:00
openpromfs
…
partitions
partitions: fix broken uevent_suppress conversion
2009-07-12 13:02:09 -07:00
proc
mm_for_maps: take ->cred_guard_mutex to fix the race with exec
2009-08-10 20:49:26 +10:00
qnx4
fs/qnx4: sanitize includes
2009-06-11 21:36:12 -04:00
quota
quota: Silence lockdep on quota_on
2009-07-30 17:31:23 +02:00
ramfs
fs/ramfs/file-nommu.c needs include/linux/sched.h
2009-07-29 19:10:36 -07:00
reiserfs
headers: smp_lock.h redux
2009-07-12 12:22:34 -07:00
romfs
ROMFS: romfs_dev_read() error ignored
2009-05-09 10:49:41 -04:00
smbfs
push BKL down into ->put_super
2009-06-11 21:36:07 -04:00
squashfs
headers: smp_lock.h redux
2009-07-12 12:22:34 -07:00
sysfs
sysfs: fix hardlink count on device_move
2009-07-28 13:45:21 -07:00
sysv
get rid of BKL in fs/sysv
2009-06-17 00:36:37 -04:00
ubifs
headers: smp_lock.h redux
2009-07-12 12:22:34 -07:00
udf
udf: Fix loading of VAT inode when drive wrongly reports number of recorded blocks
2009-07-30 17:28:26 +02:00
ufs
ufs: sector_t cannot be negative
2009-06-18 13:03:46 -07:00
xfs
xfs: fix freeing of inodes not yet added to the inode cache
2009-08-07 14:38:34 -03:00
aio.c
eventfd: revised interface and cleanups
2009-06-30 18:55:58 -07:00
anon_inodes.c
fs: Provide empty .set_page_dirty() aop for anon inodes
2009-06-18 14:46:10 +02:00
attr.c
vfs: Use lowercase names of quota functions
2009-03-26 02:18:35 +01:00
bad_inode.c
…
binfmt_aout.c
…
binfmt_elf_fdpic.c
elf_core_dump: use rcu_read_lock() to access ->real_parent
2009-06-18 13:03:52 -07:00
binfmt_elf.c
elf: fix one check-after-use
2009-07-01 11:14:28 -07:00
binfmt_em86.c
…
binfmt_flat.c
flat: fix uninitialized ptr with shared libs
2009-08-07 10:39:57 -07:00
binfmt_misc.c
…
binfmt_script.c
…
binfmt_som.c
Don't crap into descriptor table in binfmt_som
2009-03-31 23:00:28 -04:00
bio-integrity.c
block: Create bip slabs with embedded integrity vectors
2009-07-01 10:56:25 +02:00
bio.c
block: fix sg SG_DXFER_TO_FROM_DEV regression
2009-07-10 20:31:53 +02:00
block_dev.c
PM / Hibernate: Replace bdget call with simple atomic_inc of i_count
2009-07-29 21:07:55 +02:00
buffer.c
Merge branch 'for-2.6.31' of git://git.kernel.dk/linux-2.6-block
2009-06-11 11:10:35 -07:00
char_dev.c
headers: smp_lock.h redux
2009-07-12 12:22:34 -07:00
compat_binfmt_elf.c
…
compat_ioctl.c
compat_ioctl: hook up compat handler for FIEMAP ioctl
2009-08-07 10:39:56 -07:00
compat.c
headers: smp_lock.h redux
2009-07-12 12:22:34 -07:00
dcache.c
dcache: extrace and use d_unlinked()
2009-06-11 21:36:06 -04:00
dcookies.c
…
direct-io.c
block: Do away with the notion of hardsect_size
2009-05-22 23:22:54 +02:00
drop_caches.c
mm: remove __invalidate_mapping_pages variant
2009-06-16 19:47:43 -07:00
eventfd.c
eventfd: revised interface and cleanups
2009-06-30 18:55:58 -07:00
eventpoll.c
epoll: fix nested calls support
2009-06-18 13:03:41 -07:00
exec.c
cred_guard_mutex: do not return -EINTR to user-space
2009-07-06 13:57:04 -07:00
fcntl.c
headers: smp_lock.h redux
2009-07-12 12:22:34 -07:00
fifo.c
…
file_table.c
fs: move mark_files_ro into file_table.c
2009-06-11 21:36:02 -04:00
file.c
…
filesystems.c
fs: Mark get_filesystem_list() as __init function.
2009-04-20 23:02:52 -04:00
fs_struct.c
Get rid of indirect include of fs_struct.h
2009-03-31 23:00:27 -04:00
fs-writeback.c
cleanup __writeback_single_inode
2009-06-24 08:15:26 -04:00
generic_acl.c
New helper - current_umask()
2009-03-31 23:00:26 -04:00
inode.c
vfs: add __destroy_inode
2009-08-07 14:38:29 -03:00
internal.h
Trim a bit of crap from fs.h
2009-06-11 21:36:07 -04:00
ioctl.c
fs: Add new pre-allocation ioctls to vfs for compatibility with legacy xfs ioctls
2009-06-24 08:15:27 -04:00
ioprio.c
…
Kconfig
fs/Kconfig: move nilfs2 out
2009-07-14 12:34:17 +09:00
Kconfig.binfmt
…
libfs.c
New helper - simple_fsync()
2009-06-11 21:36:11 -04:00
locks.c
lockd: call locks_release_private to cleanup per-filesystem state
2009-04-24 16:36:03 -04:00
Makefile
nilfs2: update makefile and Kconfig
2009-04-07 08:31:16 -07:00
mbcache.c
…
mpage.c
ext4: Properly initialize the buffer_head state
2009-05-13 15:13:42 -04:00
namei.c
integrity: add ima_counts_put (updated)
2009-06-29 08:59:10 +10:00
namespace.c
vfs: mnt_want_write_file(): fix special file handling
2009-08-07 10:39:56 -07:00
nfsctl.c
…
no-block.c
…
open.c
fs: Add new pre-allocation ioctls to vfs for compatibility with legacy xfs ioctls
2009-06-24 08:15:27 -04:00
pipe.c
lockdep: Fix lockdep annotation for pipe_double_lock()
2009-07-22 21:14:14 +02:00
pnode.c
…
pnode.h
…
posix_acl.c
…
read_write.c
splice: implement default splice_read method
2009-05-11 14:13:10 +02:00
read_write.h
…
readdir.c
…
select.c
poll: avoid extra wakeups in select/poll
2009-06-16 19:47:48 -07:00
seq_file.c
seq_file: add function to write binary data
2009-06-18 13:03:57 -07:00
signalfd.c
…
splice.c
splice: fix kmaps in default_file_splice_write()
2009-05-19 11:37:46 +02:00
stack.c
…
stat.c
kill vfs_stat_fd / vfs_lstat_fd
2009-04-20 23:02:52 -04:00
super.c
... and the same for vfsmount id/mount group id
2009-06-24 08:15:26 -04:00
sync.c
sys_sync(): fix 16% performance regression in ffsb create_4k test
2009-07-06 13:57:03 -07:00
timerfd.c
…
utimes.c
…
xattr_acl.c
…
xattr.c
fs: introduce mnt_clone_write
2009-06-11 21:36:02 -04:00