Linus Torvalds c8fec258e5 proc: clean up and fix /proc/<pid>/mem handling ... commit e268337dfe upstream. Jüri Aedla reported that the /proc/<pid>/mem handling really isn't very robust, and it also doesn't match the permission checking of any of the other related files. This changes it to do the permission checks at open time, and instead of tracking the process, it tracks the VM at the time of the open. That simplifies the code a lot, but does mean that if you hold the file descriptor open over an execve(), you'll continue to read from the _old_ VM. That is different from our previous behavior, but much simpler. If somebody actually finds a load where this matters, we'll need to revert this commit. I suspect that nobody will ever notice - because the process mapping addresses will also have changed as part of the execve. So you cannot actually usefully access the fd across a VM change simply because all the offsets for IO would have changed too. Reported-by: Jüri Aedla <asd@ut.ee> Cc: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>		2012-01-25 17:24:55 -08:00
..
9p	fs/9p: Use protocol-defined value for lock/getlock 'type' field.	2011-10-03 11:40:22 -07:00
adfs	Fix common misspellings	2011-03-31 11:26:23 -03:00
affs	affs: remove unnecessary dentry_unhash on rmdir, dir rename	2011-05-28 01:02:53 -04:00
afs	AFS: Use i_generation not i_version for the vnode uniquifier	2011-06-16 11:44:48 -04:00
autofs4	autofs4: bogus dentry_unhash() added in ->unlink()	2011-05-30 01:50:53 -04:00
befs	befs: Validate length of long symbolic links.	2011-08-29 13:29:06 -07:00
bfs	bfs: remove unnecessary dentry_unhash on dir rename	2011-05-28 01:02:50 -04:00
btrfs	btrfs: fix d_off in the first dirent	2011-10-03 11:41:03 -07:00
cachefiles	Fix common misspellings	2011-03-31 11:26:23 -03:00
ceph	ceph analog of cifs build_path_from_dentry() race fix	2011-07-16 23:43:58 -04:00
cifs	CIFS: Fix DFS handling in cifs_get_file_info	2011-11-11 09:35:11 -08:00
coda	coda_ioctl_permission() is safe in RCU mode	2011-06-20 10:44:19 -04:00
configfs	configfs: remove unnecessary dentry_unhash on rmdir, dir rename	2011-05-28 01:02:54 -04:00
cramfs	cramfs: get_cramfs_inode() returns ERR_PTR() on failure	2011-07-17 23:22:02 -04:00
debugfs	debugfs: move to new strtobool	2011-05-19 16:55:28 +09:30
devpts	fs/devpts/inode.c: correctly check d_alloc_name() return code in devpts_pty_new()	2011-03-22 17:44:17 -07:00
dlm	Merge branch 'trivial' of git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild-2.6	2011-05-26 13:19:00 -07:00
ecryptfs	eCryptfs: Extend array bounds for all filename chars	2011-12-09 08:52:19 -08:00
efs
exofs	fix exofs ->get_parent()	2011-07-17 23:20:29 -04:00
exportfs
ext2	ext2: remove unnecessary dentry_unhash on rmdir/rename_dir	2011-05-26 07:26:56 -04:00
ext3	ext3: Don't warn from writepage when readonly inode is spotted after error	2012-01-12 11:35:06 -08:00
ext4	ext4: fix undefined behavior in ext4_fill_flex_info()	2012-01-25 17:24:33 -08:00
fat	fat: Fix corrupt inode flags when remove ATTR_SYS flag	2011-05-31 19:42:24 +09:00
freevxfs	treewide: fix a few typos in comments	2011-05-10 10:16:21 +02:00
fscache	FS-Cache: Fix __fscache_uncache_all_inode_pages()'s outer loop	2011-07-21 10:59:16 -07:00
fuse	fuse: fix fuse_retrieve	2011-12-21 12:57:44 -08:00
gfs2	GFS2: Fix mount hang caused by certain access pattern to sysfs files	2011-08-04 21:58:42 -07:00
hfs	hfs: fix hfs_find_init() sb->ext_tree NULL ptr oops	2011-12-21 12:57:41 -08:00
hfsplus	hfsplus: Fix kfree of wrong pointers in hfsplus_fill_super() error path	2011-10-25 07:10:17 +02:00
hostfs	hostfs: remove unnecessary dentry_unhash on rmdir, dir rename	2011-05-28 01:02:52 -04:00
hpfs	hpfs: remove unnecessary dentry_unhash on rmdir, dir rename	2011-05-28 01:02:54 -04:00
hppfs	hppfs: missing include	2011-11-11 09:35:59 -08:00
hugetlbfs	mm: don't access vm_flags as 'int'	2011-05-26 09:20:31 -07:00
isofs	isofs: fix bh leak in isofs_fill_super() error case	2011-06-18 07:25:42 -07:00
jbd	jbd/jbd2: validate sb->s_first in journal_get_superblock()	2011-12-21 12:57:40 -08:00
jbd2	jbd/jbd2: validate sb->s_first in journal_get_superblock()	2011-12-21 12:57:40 -08:00
jffs2	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs-2.6	2011-05-28 13:03:41 -07:00
jfs	jfs: agstart field must be 64 bits	2011-06-20 17:53:24 -05:00
lockd	NLM: Don't hang forever on NLM unlock requests	2011-06-15 11:24:27 -04:00
logfs	logfs doesn't need ->permission() at all	2011-06-20 10:44:26 -04:00
minix	minix: remove unnecessary dentry_unhash on rmdir, dir rename	2011-05-28 01:02:54 -04:00
ncpfs	ncpfs: fix rename over directory with dangling references	2011-05-28 01:02:53 -04:00
nfs	nfs: fix regression in handling of context= option in NFSv4	2012-01-25 17:24:36 -08:00
nfs_common	Fix common misspellings	2011-03-31 11:26:23 -03:00
nfsd	nfsd: Fix oops when parsing a 0 length export	2012-01-25 17:24:49 -08:00
nilfs2	nilfs2: unbreak compat ioctl	2012-01-06 14:13:52 -08:00
nls
notify	fsnotify: don't BUG in fsnotify_destroy_mark()	2012-01-25 17:24:49 -08:00
ntfs	Fix common misspellings	2011-03-31 11:26:23 -03:00
ocfs2	more conservative S_NOSEC handling	2011-06-03 18:24:58 -04:00
omfs	Remove unneeded version.h includes from fs/	2011-06-24 08:34:22 -07:00
openpromfs
partitions	Revert "block: Remove extra discard_alignment from hd_struct."	2011-05-30 07:42:51 +02:00
proc	proc: clean up and fix /proc/<pid>/mem handling	2012-01-25 17:24:55 -08:00
pstore	pstore: fix pstore filesystem mount/remount issue	2011-05-16 11:05:00 -07:00
qnx4
quota	VFS: Fix the remaining automounter semantics regressions	2011-11-11 09:36:22 -08:00
ramfs	ramfs: fix memleak on no-mmu arch	2011-04-14 16:06:56 -07:00
reiserfs	reiserfs: Force inode evictions before umount to avoid crash	2012-01-12 11:35:05 -08:00
romfs	romfs: fix romfs_get_unmapped_area() argument check	2011-06-27 18:00:12 -07:00
squashfs	Merge git://git.kernel.org/pub/scm/linux/kernel/git/pkl/squashfs-linus	2011-05-29 11:19:45 -07:00
sysfs	Delay struct net freeing while there's a sysfs instance refering to it	2011-06-12 17:45:41 -04:00
sysv	sysv: remove unnecessary dentry_unhash from rmdir, dir rename	2011-05-28 01:02:50 -04:00
ubifs	UBIFS: fix debugging messages	2012-01-25 17:24:45 -08:00
udf	udf: Fix deadlock when converting file from in-ICB one to normal one	2012-01-12 11:35:09 -08:00
ufs	ufs should use d_splice_alias()	2011-07-17 23:21:35 -04:00
xfs	xfs: fix acl count validation in xfs_acl_from_disk()	2012-01-12 11:35:55 -08:00
aio.c	Merge branch 'for-2.6.39/core' of git://git.kernel.dk/linux-2.6-block	2011-03-24 10:16:26 -07:00
anon_inodes.c
attr.c	Cache xattr security drop check for write v2	2011-05-28 12:02:09 -04:00
bad_inode.c	bad_inode_permission() is safe from RCU mode	2011-06-20 10:44:00 -04:00
binfmt_aout.c
binfmt_elf_fdpic.c	FDPIC: Fix memory leak	2011-07-06 12:15:16 -07:00
binfmt_elf.c	binfmt_elf: fix PIE execution with randomization disabled	2011-11-11 09:36:29 -08:00
binfmt_em86.c
binfmt_flat.c	CRED: Fix load_flat_shared_library() to initialise bprm correctly	2011-05-03 10:10:51 +10:00
binfmt_misc.c
binfmt_script.c
binfmt_som.c
bio-integrity.c
bio.c	block: improve the bio_add_page() and bio_add_pc_page() descriptions	2011-05-28 14:44:46 +02:00
block_dev.c	block: make gendisk hold a reference to its queue	2011-11-11 09:37:07 -08:00
buffer.c	vfs: Fix data corruption after failed write in __block_write_begin()	2011-06-16 11:44:46 -04:00
char_dev.c
compat_binfmt_elf.c
compat_ioctl.c
compat.c	exec: unify do_execve/compat_do_execve code	2011-04-09 15:53:56 +02:00
dcache.c	fix shrink_dcache_parent() livelock	2012-01-25 17:24:51 -08:00
dcookies.c	oprofile, dcookies: Fix possible circular locking dependency	2011-05-31 16:33:35 +02:00
direct-io.c	Merge branch 'for-2.6.39/core' of git://git.kernel.dk/linux-2.6-block	2011-03-24 10:16:26 -07:00
drop_caches.c	vmscan: change shrinker API by passing shrink_control struct	2011-05-25 08:39:26 -07:00
eventfd.c
eventpoll.c	epoll: fix spurious lockdep warnings	2011-11-11 09:35:29 -08:00
exec.c	exec: do not call request_module() twice from search_binary_handler()	2011-10-16 14:14:54 -07:00
fcntl.c	userns: rename is_owner_or_cap to inode_owner_or_capable	2011-03-23 19:47:13 -07:00
fhandle.c	fs/fhandle.c: add <linux/personality.h> for ia64	2011-04-14 16:06:56 -07:00
fifo.c	Filesystem: fifo: Fixed coding style issue.	2011-03-21 00:16:09 -04:00
file_table.c
file.c	vfs: avoid large kmalloc()s for the fdtable	2011-04-28 11:28:20 -07:00
filesystems.c	fs: synchronize_rcu when unregister_filesystem success not failure	2011-04-17 10:42:01 -07:00
fs_struct.c
fs-writeback.c	writeback: update dirtied_when for synced inode to prevent livelock	2011-10-03 11:40:44 -07:00
generic_acl.c	userns: rename is_owner_or_cap to inode_owner_or_capable	2011-03-23 19:47:13 -07:00
inode.c	mm: fix assertion mapping->nrpages == 0 in end_writeback()	2011-06-27 18:00:13 -07:00
internal.h	fs: move i_wb_list out from under inode_lock	2011-03-24 21:17:51 -04:00
ioctl.c	vfs: cleanup do_vfs_ioctl()	2011-03-21 00:16:08 -04:00
ioprio.c
Kconfig	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs-2.6	2011-05-26 09:52:14 -07:00
Kconfig.binfmt
libfs.c	fs/libfs.c: fix simple_attr_write() on 32bit machines	2011-07-19 22:09:30 -07:00
locks.c	fs: fix lock initialization	2011-07-06 10:41:13 -07:00
Makefile
mbcache.c	vmscan: change shrinker API by passing shrink_control struct	2011-05-25 08:39:26 -07:00
mpage.c	mm/fs: add hooks to support cleancache	2011-05-26 10:01:43 -06:00
namei.c	VFS: we need to set LOOKUP_JUMPED on mountpoint crossing	2011-11-11 09:37:08 -08:00
namespace.c	fix apparmor dereferencing potentially freed dentry, sanitize __d_path() API	2011-12-21 12:57:36 -08:00
nfsctl.c
no-block.c
open.c	fs: Use BUG_ON(!mnt) at dentry_open().	2011-03-21 01:10:41 -04:00
pipe.c
pnode.c
pnode.h
posix_acl.c
read_write.c
read_write.h
readdir.c
select.c	select: remove unused MAX_SELECT_SECONDS	2011-03-21 00:16:08 -04:00
seq_file.c	fix apparmor dereferencing potentially freed dentry, sanitize __d_path() API	2011-12-21 12:57:36 -08:00
signalfd.c
splice.c	splice: add wakeup_pipe_readers()	2011-05-23 19:58:53 +02:00
stack.c
stat.c	readlinkat: ensure we return ENOENT for the empty pathname for normal lookups	2011-11-11 09:36:19 -08:00
statfs.c	VFS: fix statfs() automounter semantics regression	2011-11-11 09:37:08 -08:00
super.c	more conservative S_NOSEC handling	2011-06-03 18:24:58 -04:00
sync.c	Merge branch 'for-2.6.39/core' of git://git.kernel.dk/linux-2.6-block	2011-03-24 10:16:26 -07:00
timerfd.c	timerfd: Fix wakeup of processes when timer is cancelled on clock change	2011-06-14 11:46:14 +02:00
utimes.c	userns: rename is_owner_or_cap to inode_owner_or_capable	2011-03-23 19:47:13 -07:00
xattr_acl.c
xattr.c	Cache xattr security drop check for write v2	2011-05-28 12:02:09 -04:00