Christian Borntraeger e3a2a0d4e5 anon_inodes: use fops->owner for module refcount ...

There is an imbalance for anonymous inodes. If the fops->owner field is set,
the module reference count of owner is decreases on release.
("filp_close" --> "__fput" ---> "fops_put")

On the other hand, anon_inode_getfd does not increase the module reference
count of owner. This causes two problems:

- if owner is set, the module refcount goes negative
- if owner is not set, the module can be unloaded while code is running

This patch changes anon_inode_getfd to be symmetric regarding fops->owner
handling.

I have checked all existing users of anon_inode_getfd. Noone sets fops->owner,
thats why nobody has seen the module refcount negative. The refcounting was
tested with a patched and unpatched KVM module.(see patch 2/2) I also did an
epoll_open/close test.

Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Reviewed-by: Davide Libenzi <davidel@xmailserver.org>
Signed-off-by: Avi Kivity <avi@redhat.com>

2008-12-31 16:55:44 +02:00

..

9p

Merge branch 'next' into for-linus

2008-12-25 11:40:09 +11:00

adfs

vfs: Use const for kernel parser table

2008-10-13 10:10:37 -07:00

affs

CRED: Wrap task credential accesses in the AFFS filesystem

2008-11-14 10:38:45 +11:00

afs

fs: replace NIPQUAD()

2008-10-31 00:56:28 -07:00

autofs

CRED: Wrap task credential accesses in the autofs filesystem

2008-11-14 10:38:45 +11:00

autofs4

Merge branch 'master' into next

2008-11-14 11:29:12 +11:00

befs

befs: annotate fs32 on tests for superblock endianness

2008-10-16 11:21:46 -07:00

bfs

CRED: Wrap task credential accesses in the BFS filesystem

2008-11-14 10:38:47 +11:00

cifs

cifs: update for new IP4/6 address printing

2008-12-28 16:29:58 -08:00

coda

coda: fix creds reference

2008-11-20 08:11:52 +11:00

configfs

[PATCH] assorted path_lookup() -> kern_path() conversions

2008-10-23 05:12:52 -04:00

cramfs

cramfs: fix named-pipe handling

2008-08-20 15:40:32 -07:00

debugfs

integrity: special fs magic

2008-10-13 09:47:43 +11:00

devpts

CRED: Wrap task credential accesses in the devpts filesystem

2008-11-14 10:38:49 +11:00

dlm

fix warning in fs/dlm/netlink.c

2008-11-25 16:51:45 -08:00

ecryptfs

Merge branch 'master' into next

2008-12-04 17:16:36 +11:00

efs

[PATCH] switch all filesystems over to d_obtain_alias

2008-10-23 05:13:01 -04:00

exportfs

Merge branch 'next' into for-linus

2008-12-25 11:40:09 +11:00

ext2

CRED: Wrap task credential accesses in the Ext2 filesystem

2008-11-14 10:38:50 +11:00

ext3

Merge branch 'master' into next

2008-11-14 11:29:12 +11:00

ext4

Get rid of CONFIG_LSF

2008-12-29 08:29:51 +01:00

fat

Merge branch 'master' into next

2008-11-14 11:29:12 +11:00

freevxfs

fs/freevxfs/: proper externs

2008-04-29 08:06:00 -07:00

fuse

CRED: Use RCU to access another task's creds and to release a task's own creds

2008-11-14 10:39:19 +11:00

gfs2

CRED: Wrap task credential accesses in the GFS2 filesystem

2008-11-14 10:38:53 +11:00

hfs

CRED: Wrap task credential accesses in the HFS filesystem

2008-11-14 10:38:54 +11:00

hfsplus

CRED: Wrap task credential accesses in the HFSplus filesystem

2008-11-14 10:38:54 +11:00

hostfs

hostfs: fix a duplicated global function name

2008-11-19 18:50:00 -08:00

hpfs

CRED: Wrap task credential accesses in the HPFS filesystem

2008-11-14 10:38:55 +11:00

hppfs

CRED: Use creds in file structs

2008-11-14 10:39:25 +11:00

hugetlbfs

CRED: Wrap current->cred and a few other accessors

2008-11-14 10:39:18 +11:00

isofs

[PATCH] switch all filesystems over to d_obtain_alias

2008-10-23 05:13:01 -04:00

jbd

jbd: don't give up looking for space so easily in __log_wait_for_space

2008-11-06 22:37:59 -05:00

jbd2

jbd2: don't give up looking for space so easily in __jbd2_log_wait_for_space

2008-11-06 22:38:07 -05:00

jffs2

Merge git://git.infradead.org/mtd-2.6

2008-11-06 15:43:13 -08:00

jfs

Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/shaggy/jfs-2.6

2008-12-30 17:33:33 -08:00

lockd

Merge branch 'devel' into next

2008-12-30 16:51:43 -05:00

minix

CRED: Wrap task credential accesses in the Minix filesystem

2008-11-14 10:38:57 +11:00

ncpfs

CRED: Wrap task credential accesses in the NCPFS filesystem

2008-11-14 10:38:58 +11:00

nfs

Merge branch 'devel' into next

2008-12-30 16:51:43 -05:00

nfs_common

SUNRPC: nfsacl_encode/nfsacl_decode should be exported as GPL-only

2008-12-23 15:21:32 -05:00

nfsd

Merge branch 'devel' into next

2008-12-30 16:51:43 -05:00

nls

remove CONFIG_KMOD from fs

2008-10-17 02:38:36 +11:00

ntfs

ntfs: don't fool kernel-doc

2008-12-01 19:55:25 -08:00

ocfs2

Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next-2.6

2008-12-28 12:49:40 -08:00

omfs

CRED: Wrap task credential accesses in the OMFS filesystem

2008-11-14 10:38:59 +11:00

openpromfs

[PATCH] fix ->llseek for more directories

2008-10-23 05:13:21 -04:00

partitions

block/md: fix md autodetection

2008-11-18 15:08:56 +01:00

proc

Merge branch 'irq-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip

2008-12-30 16:20:19 -08:00

qnx4

SL*B: drop kmem cache argument from constructor

2008-07-26 12:00:07 -07:00

ramfs

CRED: Wrap task credential accesses in the RAMFS filesystem

2008-11-14 10:39:00 +11:00

reiserfs

CRED: Wrap task credential accesses in the ReiserFS filesystem

2008-11-14 10:39:01 +11:00

romfs

romfs_readpage: don't report errors for pages beyond i_size

2008-07-30 14:30:34 -07:00

smbfs

CRED: Wrap current->cred and a few other accessors

2008-11-14 10:39:18 +11:00

sysfs

[PATCH] fix ->llseek for more directories

2008-10-23 05:13:21 -04:00

sysv

CRED: Wrap task credential accesses in the SYSV filesystem

2008-11-14 10:39:02 +11:00

ubifs

Merge branch 'master' into next

2008-12-04 17:16:36 +11:00

udf

Merge branch 'master' into next

2008-12-04 17:16:36 +11:00

ufs

CRED: Wrap task credential accesses in the UFS filesystem

2008-11-14 10:39:04 +11:00

xfs

[XFS] Fix merge failures

2008-12-29 16:47:18 +11:00

aio.c

aio: make the lookup_ioctx() lockless

2008-12-29 08:29:50 +01:00

anon_inodes.c

anon_inodes: use fops->owner for module refcount

2008-12-31 16:55:44 +02:00

attr.c

CRED: Wrap task credential accesses in the filesystem subsystem

2008-11-14 10:39:05 +11:00

bad_inode.c

[PATCH] sanitize ->permission() prototype

2008-07-26 20:53:14 -04:00

binfmt_aout.c

CRED: Make execve() take advantage of copy-on-write credentials

2008-11-14 10:39:24 +11:00

binfmt_elf_fdpic.c

CRED: Make execve() take advantage of copy-on-write credentials

2008-11-14 10:39:24 +11:00

binfmt_elf.c

Merge branch 'for-linus' of git://git390.osdl.marist.edu/pub/scm/linux-2.6

2008-12-28 12:33:21 -08:00

binfmt_em86.c

Allow recursion in binfmt_script and binfmt_misc

2008-10-16 11:21:38 -07:00

binfmt_flat.c

CRED: Make execve() take advantage of copy-on-write credentials

2008-11-14 10:39:24 +11:00

binfmt_misc.c

Allow recursion in binfmt_script and binfmt_misc

2008-10-16 11:21:38 -07:00

binfmt_script.c

Allow recursion in binfmt_script and binfmt_misc

2008-10-16 11:21:38 -07:00

binfmt_som.c

CRED: Make execve() take advantage of copy-on-write credentials

2008-11-14 10:39:24 +11:00

bio-integrity.c

bio: allow individual slabs in the bio_set

2008-12-29 08:29:23 +01:00

bio.c

bio: get rid of bio_vec clearing

2008-12-29 08:29:53 +01:00

block_dev.c

[PATCH 1/2] kill FMODE_NDELAY_NOW

2008-12-04 04:22:57 -05:00

buffer.c

block: Supress Buffer I/O errors when SCSI REQ_QUIET flag set

2008-12-29 08:28:44 +01:00

char_dev.c

[PATCH] tidy up chrdev_open

2008-10-23 05:12:59 -04:00

compat_binfmt_elf.c

x86: compat_binfmt_elf

2008-01-30 13:31:46 +01:00

compat_ioctl.c

remove unused #include <linux/dirent.h>'s

2008-07-25 10:53:34 -07:00

compat.c

CRED: Make execve() take advantage of copy-on-write credentials

2008-11-14 10:39:24 +11:00

dcache.c

[PATCH] fs: add a sanity check in d_free

2008-10-23 05:17:12 -04:00

dcookies.c

d_path: Make d_path() use a struct path

2008-02-14 21:17:09 -08:00

direct-io.c

Remove Andrew Morton's old email accounts

2008-10-16 11:21:32 -07:00

dnotify.c

[PATCH] split linux/file.h

2008-05-01 13:08:16 -04:00

dquot.c

CRED: Wrap task credential accesses in the filesystem subsystem

2008-11-14 10:39:05 +11:00

drop_caches.c

vfs: skip inodes without pages to free in drop_pagecache_sb()

2008-04-29 08:06:05 -07:00

eventfd.c

flag parameters: check magic constants

2008-07-24 10:47:29 -07:00

eventpoll.c

epoll: introduce resource usage limits

2008-12-01 19:55:24 -08:00

exec.c

Merge branch 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip

2008-12-30 16:16:21 -08:00

fcntl.c

Merge branch 'next' into for-linus

2008-12-25 11:40:09 +11:00

fifo.c

[PATCH] introduce fmode_t, do annotations

2008-10-21 07:47:06 -04:00

file_table.c

CRED: Use creds in file structs

2008-11-14 10:39:25 +11:00

file.c

[PATCH] merge locate_fd() and get_unused_fd()

2008-08-01 11:25:23 -04:00

filesystems.c

proc: move /proc/filesystems to fs/filesystems.c

2008-10-23 14:27:09 +04:00

fs-writeback.c

Remove Andrew Morton's old email accounts

2008-10-16 11:21:32 -07:00

generic_acl.c

…

inode.c

fs: xfs needs inode_wait to be exported

2008-11-10 17:06:05 +11:00

inotify_user.c

CRED: Wrap task credential accesses in the filesystem subsystem

2008-11-14 10:39:05 +11:00

inotify.c

inotify: fix IN_ONESHOT unmount event watcher

2008-12-10 08:01:53 -08:00

internal.h

CRED: Make execve() take advantage of copy-on-write credentials

2008-11-14 10:39:24 +11:00

ioctl.c

Fix a race condition in FASYNC handling

2008-12-05 15:35:10 -08:00

ioprio.c

CRED: Use RCU to access another task's creds and to release a task's own creds

2008-11-14 10:39:19 +11:00

Kconfig

[patch 1/3] FS_MBCACHE: don't needlessly make it built-in

2008-10-23 05:13:26 -04:00

Kconfig.binfmt

add CONFIG_CORE_DUMP_DEFAULT_ELF_HEADERS

2008-10-20 08:52:39 -07:00

libfs.c

fs: remove prepare_write/commit_write

2008-10-30 11:38:45 -07:00

locks.c

CRED: Wrap task credential accesses in the filesystem subsystem

2008-11-14 10:39:05 +11:00

Makefile

fat: move fs/vfat/* and fs/msdos/* to fs/fat

2008-11-06 15:41:20 -08:00

mbcache.c

vfs: fix possible deadlock in ext2, ext3, ext4 when using xattrs

2008-04-15 19:35:41 -07:00

mpage.c

Remove Andrew Morton's old email accounts

2008-10-16 11:21:32 -07:00

namei.c

Merge branch 'master' into next

2008-12-04 17:16:36 +11:00

namespace.c

Merge branch 'master' into next

2008-11-14 11:29:12 +11:00

nfsctl.c

nfsctl: add headers for credentials

2008-11-20 08:11:55 +11:00

no-block.c

…

open.c

CRED: Inaugurate COW credentials

2008-11-14 10:39:23 +11:00

pipe.c

CRED: Wrap task credential accesses in the filesystem subsystem

2008-11-14 10:39:05 +11:00

pnode.c

[patch 7/7] vfs: mountinfo: show dominating group id

2008-04-23 00:05:09 -04:00

pnode.h

[patch 7/7] vfs: mountinfo: show dominating group id

2008-04-23 00:05:09 -04:00

posix_acl.c

CRED: Wrap task credential accesses in the filesystem subsystem

2008-11-14 10:39:05 +11:00

quota_v1.c

quota: move function-macros from quota.h to quotaops.h

2008-07-25 10:53:35 -07:00

quota_v2.c

quota: move function-macros from quota.h to quotaops.h

2008-07-25 10:53:35 -07:00

quota.c

CRED: Wrap task credential accesses in the filesystem subsystem

2008-11-14 10:39:05 +11:00

read_write.c

[PATCH] generic_file_llseek tidyups

2008-10-23 05:12:59 -04:00

read_write.h

…

readdir.c

[PATCH] prepare vfs_readdir() callers to returning filldir result

2008-10-23 05:13:10 -04:00

select.c

select: deal with math overflow from borderline valid userland data

2008-10-26 11:22:08 -07:00

seq_file.c

vfs, seqfile: export mangle_path() generally

2008-11-28 18:07:10 +01:00

signalfd.c

flag parameters: check magic constants

2008-07-24 10:47:29 -07:00

splice.c

fs: remove prepare_write/commit_write

2008-10-30 11:38:45 -07:00

stack.c

…

stat.c

[PATCH] sanitize __user_walk_fd() et.al.

2008-07-26 20:53:34 -04:00

super.c

security: pass mount flags to security_sb_kern_mount()

2008-12-20 09:02:39 +11:00

sync.c

SYNC_FILE_RANGE_WRITE may and will block. Document that.

2008-07-24 10:47:17 -07:00

timerfd.c

hrtimer: convert timerfd to the new hrtimer apis

2008-09-05 21:35:09 -07:00

utimes.c

[PATCH] sanitize __user_walk_fd() et.al.

2008-07-26 20:53:34 -04:00

xattr_acl.c

…

xattr.c

[PATCH] sanitize __user_walk_fd() et.al.

2008-07-26 20:53:34 -04:00