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Andrey Mirkin 80dc4d3acc [PATCH] skip data conversion in compat_sys_mount when data_page is NULL 
OpenVZ Linux kernel team has found a problem with mounting in compat mode.

Simple command "mount -t smbfs ..." on Fedora Core 5 distro in 32-bit mode
leads to oops:

Unable to handle kernel NULL pointer dereference at 0000000000000000 RIP:
[<ffffffff802bc7c6>] compat_sys_mount+0xd6/0x290
PGD 34d48067 PUD 34d03067 PMD 0
Oops: 0000 [1] SMP
CPU: 0
Modules linked in: iptable_nat simfs smbfs ip_nat ip_conntrack vzdquota
parport_pc lp parport 8021q bridge llc vznetdev vzmon nfs lockd sunrpc vzdev
iptable_filter af_packet xt_length ipt_ttl xt_tcpmss ipt_TCPMSS
iptable_mangle xt_limit ipt_tos ipt_REJECT ip_tables x_tables thermal
processor fan button battery asus_acpi ac uhci_hcd ehci_hcd usbcore i2c_i801
i2c_core e100 mii floppy ide_cd cdrom
Pid: 14656, comm: mount
RIP: 0060:[<ffffffff802bc7c6>]  [<ffffffff802bc7c6>]
compat_sys_mount+0xd6/0x290
RSP: 0000:ffff810034d31f38  EFLAGS: 00010292
RAX: 000000000000002c RBX: 0000000000000000 RCX: 0000000000000000
RDX: ffff810034c86bc0 RSI: 0000000000000096 RDI: ffffffff8061fc90
RBP: ffff810034d31f78 R08: 0000000000000000 R09: 000000000000000d
R10: ffff810034d31e58 R11: 0000000000000001 R12: ffff810039dc3000
R13: 000000000805ea48 R14: 0000000000000000 R15: 00000000c0ed0000
FS:  0000000000000000(0000) GS:ffffffff80749000(0033) knlGS:00000000b7d556b0
CS:  0060 DS: 007b ES: 007b CR0: 000000008005003b
CR2: 0000000000000000 CR3: 0000000034d43000 CR4: 00000000000006e0
Process mount (pid: 14656, veid=300, threadinfo ffff810034d30000, task
ffff810034c86bc0)
Stack:  0000000000000000 ffff810034dd0000 ffff810034e4a000 000000000805ea48
 0000000000000000 0000000000000000 0000000000000000 0000000000000000
 000000000805ea48 ffffffff8021e64e 0000000000000000 0000000000000000
Call Trace:
 [<ffffffff8021e64e>] ia32_sysret+0x0/0xa

Code: 83 3b 06 0f 85 41 01 00 00 0f b7 43 0c 89 43 14 0f b7 43 0a
RIP  [<ffffffff802bc7c6>] compat_sys_mount+0xd6/0x290
 RSP <ffff810034d31f38>
CR2: 0000000000000000

The problem is that data_page pointer can be NULL, so we should skip data
conversion in this case.

Signed-off-by: Andrey Mirkin <amirkin@openvz.org>
Cc: <stable@kernel.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Chris Wright <chrisw@sous-sol.org>
2006-12-16 16:20:48 -08:00
..
9p
[PATCH] 9p: fix fid behavior on failed remove
2006-07-31 13:28:44 -07:00
adfs
[PATCH] adfs error message fix
2006-08-14 12:54:28 -07:00
affs
[PATCH] mark address_space_operations const
2006-06-28 14:59:04 -07:00
afs
[PATCH] mark address_space_operations const
2006-06-28 14:59:04 -07:00
autofs
[PATCH] VFS: Permit filesystem to override root dentry on mount
2006-06-23 07:42:45 -07:00
autofs4
[PATCH] fs: use list_move()
2006-06-26 09:58:18 -07:00
befs
[PATCH] Fix BeFS slab corruption
2006-08-06 08:57:48 -07:00
bfs
[PATCH] mark address_space_operations const
2006-06-28 14:59:04 -07:00
cifs
[PATCH] CIFS: New POSIX locking code not setting rc properly to zero on successful
2006-11-18 19:28:05 -08:00
coda
[PATCH] Remove incorrect unlock_kernel from allocation failure path in coda_open()
2006-07-31 13:28:41 -07:00
configfs
configfs: Clear up a few extra spaces where there should be TABs.
2006-06-29 14:43:01 -07:00
cramfs
[PATCH] mark address_space_operations const
2006-06-28 14:59:04 -07:00
debugfs
Remove obsolete #include <linux/config.h>
2006-06-30 19:25:36 +02:00
devpts
[PATCH] VFS: Permit filesystem to override root dentry on mount
2006-06-23 07:42:45 -07:00
efs
[PATCH] efs: Remove incorrect unlock_kernel from failure path in efs_symlink_readpage()
2006-07-31 13:28:41 -07:00
exportfs
[PATCH] NFS server subtree_check returns dubious value
2006-05-21 12:59:16 -07:00
ext2
[PATCH] EXT2: Remove superblock lock contention in ext2_statfs
2006-09-19 07:59:59 -07:00
ext3
[PATCH] ext3 sequential read regression fix
2006-09-16 12:54:32 -07:00
fat
[PATCH] mark address_space_operations const
2006-06-28 14:59:04 -07:00
freevxfs
[PATCH] freevxfs: Add missing lock_kernel() to vxfs_readdir
2006-07-31 13:28:44 -07:00
fuse
[PATCH] fuse: fix Oops in lookup
2006-12-01 16:12:37 -08:00
hfs
Remove obsolete #include <linux/config.h>
2006-06-30 19:25:36 +02:00
hfsplus
Remove obsolete #include <linux/config.h>
2006-06-30 19:25:36 +02:00
hostfs
[PATCH] mark address_space_operations const
2006-06-28 14:59:04 -07:00
hpfs
[PATCH] mark address_space_operations const
2006-06-28 14:59:04 -07:00
hppfs
[PATCH] VFS: Permit filesystem to perform statfs with a known root dentry
2006-06-23 07:42:45 -07:00
hugetlbfs
[PATCH] mmap zero-length hugetlb file with PROT_NONE to protect a hugetlb virtual area
2006-07-10 13:24:21 -07:00
isofs
Remove obsolete #include <linux/config.h>
2006-06-30 19:25:36 +02:00
jbd
jbd: fix commit of ordered data buffers
2006-10-13 13:23:22 -07:00
jffs
Remove obsolete #include <linux/config.h>
2006-06-30 19:25:36 +02:00
jffs2
[PATCH] JFFS2: SUMMARY: fix a summary collecting bug
2006-09-16 12:54:32 -07:00
jfs
[PATCH] JFS: pageno needs to be long
2006-11-03 17:33:46 -08:00
lockd
LOCKD: Fix a deadlock in nlm_traverse_files()
2006-08-24 15:51:00 -04:00
minix
[PATCH] Fix for minix crash
2006-08-27 11:01:30 -07:00
msdos
[PATCH] VFS: Permit filesystem to override root dentry on mount
2006-06-23 07:42:45 -07:00
ncpfs
Merge git://git.kernel.org/pub/scm/linux/kernel/git/bunk/trivial
2006-06-30 15:39:30 -07:00
nfs
[PATCH] NFS: nfs_lookup - don't hash dentry when optimising away the lookup
2006-11-03 17:33:49 -08:00
nfs_common
…
nfsd
[PATCH] knfsd: Fix stale file handle problem with subtree_checking.
2006-07-31 13:28:37 -07:00
nls
Remove obsolete #include <linux/config.h>
2006-06-30 19:25:36 +02:00
ntfs
[PATCH] lockdep: annotate NTFS locking rules
2006-07-03 15:27:08 -07:00
ocfs2
ocfs2: allocation hints
2006-08-07 11:07:01 -07:00
openpromfs
[OPENPROMFS]: Rewrite using in-kernel device tree and seq_file.
2006-06-25 23:19:14 -07:00
partitions
[DISKLABEL] SUN: Fix signed int usage for sector count
2006-08-26 17:55:55 -07:00
proc
[PATCH] /proc/meminfo: don't put spaces in names
2006-08-27 11:01:33 -07:00
qnx4
Remove obsolete #include <linux/config.h>
2006-06-30 19:25:36 +02:00
ramfs
[PATCH] NOMMU: Fix execution off of ramfs with mmap()
2006-07-10 13:24:21 -07:00
reiserfs
[PATCH] lockdep: annotate reiserfs
2006-08-27 11:01:32 -07:00
romfs
[PATCH] mark address_space_operations const
2006-06-28 14:59:04 -07:00
smbfs
Remove obsolete #include <linux/config.h>
2006-06-30 19:25:36 +02:00
sysfs
sysfs: remove duplicated dput in sysfs_update_file
2006-10-13 13:23:25 -07:00
sysv
[PATCH] mark address_space_operations const
2006-06-28 14:59:04 -07:00
udf
Fix possible UDF deadlock and memory corruption (CVE-2006-4145)
2006-08-22 12:52:23 -07:00
ufs
[PATCH] ufs: truncate correction
2006-08-27 11:01:31 -07:00
vfat
[PATCH] VFS: Permit filesystem to override root dentry on mount
2006-06-23 07:42:45 -07:00
xfs
[XFS] Fix a bad pointer dereference in the quota statvfs handling.
2006-09-07 14:27:23 +10:00
aio.c
spelling fixes
2006-06-26 18:35:02 +02:00
attr.c
…
bad_inode.c
…
binfmt_aout.c
…
binfmt_elf_fdpic.c
[PATCH] FDPIC: Add coredump capability for the ELF-FDPIC binfmt
2006-07-10 13:24:22 -07:00
binfmt_elf.c
[PATCH] FDPIC: Move roundup() into linux/kernel.h
2006-07-10 13:24:22 -07:00
binfmt_em86.c
…
binfmt_flat.c
Remove obsolete #include <linux/config.h>
2006-06-30 19:25:36 +02:00
binfmt_misc.c
Merge branch 'master' of /home/trondmy/kernel/linux-2.6/
2006-06-24 13:07:53 -04:00
binfmt_script.c
…
binfmt_som.c
Remove obsolete #include <linux/config.h>
2006-06-30 19:25:36 +02:00
bio.c
[PATCH] Fix missing ret assignment in __bio_map_user() error path
2006-06-17 10:52:12 -07:00
block_dev.c
[PATCH] lockdep: fix blkdev_open() warning
2006-08-27 11:01:29 -07:00
buffer.c
mm: bug in set_page_dirty_buffers
2006-10-13 13:23:27 -07:00
char_dev.c
[PATCH] add function documentation for register_chrdev()
2006-07-14 21:53:54 -07:00
compat_ioctl.c
Remove obsolete #include <linux/config.h>
2006-06-30 19:25:36 +02:00
compat.c
[PATCH] skip data conversion in compat_sys_mount when data_page is NULL
2006-12-16 16:20:48 -08:00
dcache.c
[PATCH] lockdep: annotate dcache
2006-07-03 15:27:06 -07:00
dcookies.c
Remove obsolete #include <linux/config.h>
2006-06-30 19:25:36 +02:00
direct-io.c
[PATCH] lockdep: annotate direct io
2006-07-03 15:27:06 -07:00
dnotify.c
…
dquot.c
[PATCH] use list_add_tail() instead of list_add()
2006-06-26 09:58:17 -07:00
drop_caches.c
…
eventpoll.c
[PATCH] eventpoll.c compile fix
2006-08-27 11:01:31 -07:00
exec.c
[PATCH] fix up lockdep trace in fs/exec.c
2006-08-27 11:01:32 -07:00
fcntl.c
…
fifo.c
…
file_table.c
Remove obsolete #include <linux/config.h>
2006-06-30 19:25:36 +02:00
file.c
[PATCH] alloc_fdtable() expansion fix
2006-07-12 12:52:55 -07:00
filesystems.c
…
fs-writeback.c
[PATCH] zoned vm counters: conversion of nr_unstable to per zone counter
2006-06-30 11:25:36 -07:00
inode.c
Merge git://git.kernel.org/pub/scm/linux/kernel/git/bunk/trivial
2006-06-30 15:39:30 -07:00
inotify_user.c
[PATCH] inotify: fix deadlock found by lockdep
2006-07-31 13:28:41 -07:00
inotify.c
[PATCH] inotify (4/5): allow watch removal from event handler
2006-06-20 05:25:19 -04:00
ioctl.c
Remove obsolete #include <linux/config.h>
2006-06-30 19:25:36 +02:00
ioprio.c
[PATCH] uninline ioprio_best()
2006-08-21 10:02:50 +02:00
Kconfig
Merge git://git.kernel.org/pub/scm/linux/kernel/git/sfrench/cifs-2.6
2006-07-13 16:38:58 -07:00
Kconfig.binfmt
…
libfs.c
[PATCH] core: use list_move()
2006-06-26 09:58:17 -07:00
locks.c
[PATCH] fcntl(F_SETSIG) fix
2006-08-14 13:10:59 -07:00
Makefile
[PATCH] devfs: Remove devfs from the kernel tree
2006-06-26 12:25:05 -07:00
mbcache.c
…
mpage.c
[PATCH] writeback: fix range handling
2006-06-23 07:42:49 -07:00
namei.c
VFS: Fix access("file", X_OK) in the presence of ACLs
2006-08-24 15:54:58 -04:00
namespace.c
Remove obsolete #include <linux/config.h>
2006-06-30 19:25:36 +02:00
nfsctl.c
Remove obsolete #include <linux/config.h>
2006-06-30 19:25:36 +02:00
open.c
[PATCH] ftruncate does not always update m/ctime
2006-06-25 10:01:15 -07:00
pipe.c
[PATCH] VFS: Permit filesystem to override root dentry on mount
2006-06-23 07:42:45 -07:00
pnode.c
[PATCH] core: use list_move()
2006-06-26 09:58:17 -07:00
pnode.h
…
posix_acl.c
…
quota_v1.c
…
quota_v2.c
…
quota.c
…
read_write.c
[PATCH] fs/read_write.c: EXPORT_UNUSED_SYMBOL
2006-07-10 13:24:18 -07:00
readdir.c
…
select.c
[PATCH] fs: sys_poll with timeout -1 bug fix
2006-06-25 10:01:22 -07:00
seq_file.c
…
splice.c
[PATCH] splice: fix pipe_to_file() ->prepare_write() error path
2006-11-03 17:33:44 -08:00
stat.c
Remove obsolete #include <linux/config.h>
2006-06-30 19:25:36 +02:00
super.c
[PATCH] add missing desctiption in super.c
2006-09-06 11:00:01 -07:00
sync.c
[PATCH] writeback: fix range handling
2006-06-23 07:42:49 -07:00
xattr_acl.c
…
xattr.c
[PATCH] log more info for directory entry change events
2006-06-20 05:25:28 -04:00