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Oleg Nesterov d2005e3f41 userfaultfd: don't pin the user memory in userfaultfd_file_create() ... userfaultfd_file_create() increments mm->mm_users; this means that the memory won't be unmapped/freed if mm owner exits/execs, and UFFDIO_COPY after that can populate the orphaned mm more. Change userfaultfd_file_create() and userfaultfd_ctx_put() to use mm->mm_count to pin mm_struct. This means that atomic_inc_not_zero(mm->mm_users) is needed when we are going to actually play with this memory. Except handle_userfault() path doesn't need this, the caller must already have a reference. The patch adds the new trivial helper, mmget_not_zero(), it can have more users. Link: http://lkml.kernel.org/r/20160516172254.GA8595@redhat.com Signed-off-by: Oleg Nesterov <oleg@redhat.com> Cc: Andrea Arcangeli <aarcange@redhat.com> Cc: Michal Hocko <mhocko@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>		9 years ago
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9p	Merge branch 'work.preadv2' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	9 years ago
adfs	…
affs	Merge branch 'work.preadv2' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	9 years ago
afs	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next	9 years ago
autofs4	dcache_{readdir,dir_lseek}() users: switch to ->iterate_shared	9 years ago
befs	befs: switch to ->iterate_shared()	9 years ago
bfs	more trivial ->iterate_shared conversions	9 years ago
btrfs	Merge branch 'work.lookups' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	9 years ago
cachefiles	mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros	9 years ago
ceph	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	9 years ago
cifs	Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/linux-security	9 years ago
coda	introduce a parallel variant of ->iterate()	9 years ago
configfs	configfs_readdir(): make safe under shared lock	9 years ago
cramfs	more trivial ->iterate_shared conversions	9 years ago
crypto	ext4/fscrypto: avoid RCU lookup in d_revalidate	9 years ago
debugfs	debugfs: Make automount point inodes permanently empty	9 years ago
devpts	devpts: more pty driver interface cleanups	9 years ago
dlm	mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros	9 years ago
ecryptfs	Merge branch 'work.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	9 years ago
efivarfs	efivarfs: Make efivarfs_file_ioctl() static	9 years ago
efs	more trivial ->iterate_shared conversions	9 years ago
exofs	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial	9 years ago
exportfs	introduce a parallel variant of ->iterate()	9 years ago
ext2	Merge branch 'work.preadv2' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	9 years ago
ext4	Merge branch 'work.preadv2' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	9 years ago
f2fs	Merge branch 'work.preadv2' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	9 years ago
fat	Merge branch 'work.preadv2' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	9 years ago
freevxfs	more trivial ->iterate_shared conversions	9 years ago
fscache	mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros	9 years ago
fuse	Merge branch 'work.preadv2' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	9 years ago
gfs2	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	9 years ago
hfs	Merge branch 'work.preadv2' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	9 years ago
hfsplus	Merge branch 'work.preadv2' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	9 years ago
hostfs	hostfs: switch to ->iterate_shared()	9 years ago
hpfs	hpfs: switch to ->iterate_shared()	9 years ago
hugetlbfs	mm, fs: remove remaining PAGE_CACHE_* and page_cache_{get,release} usage	9 years ago
isofs	Merge branch 'ovl-fixes' into for-linus	9 years ago
jbd2	Merge branch 'master' into for-next	9 years ago
jffs2	more trivial ->iterate_shared conversions	9 years ago
jfs	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	9 years ago
kernfs	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	9 years ago
lockd	…
logfs	logfs: no need to lock directory in lseek	9 years ago
minix	simple local filesystems: switch to ->iterate_shared()	9 years ago
ncpfs	mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros	9 years ago
nfs	Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/linux-security	9 years ago
nfs_common	…
nfsd	Merge branch 'work.preadv2' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	9 years ago
nilfs2	Merge branch 'work.preadv2' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	9 years ago
nls	…
notify	fsnotify: avoid spurious EMFILE errors from inotify_init()	9 years ago
ntfs	fs: simplify the generic_write_sync prototype	9 years ago
ocfs2	ocfs2: clean up an unneeded goto in ocfs2_put_slot()	9 years ago
omfs	more trivial ->iterate_shared conversions	9 years ago
openpromfs	more trivial ->iterate_shared conversions	9 years ago
orangefs	orangefs: don't open-code inode_lock/inode_unlock	9 years ago
overlayfs	Merge branch 'ovl-fixes' into for-linus	9 years ago
proc	Merge branch 'akpm' (patches from Andrew)	9 years ago
pstore	mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros	9 years ago
qnx4	more trivial ->iterate_shared conversions	9 years ago
qnx6	more trivial ->iterate_shared conversions	9 years ago
quota	fs/quota: use nla_put_u64_64bit()	9 years ago
ramfs	tmpfs/ramfs: fix VM_MAYSHARE mappings for NOMMU	9 years ago
reiserfs	Merge branch 'work.preadv2' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	9 years ago
romfs	romfs, squashfs: switch to ->iterate_shared()	9 years ago
squashfs	romfs, squashfs: switch to ->iterate_shared()	9 years ago
sysfs	…
sysv	simple local filesystems: switch to ->iterate_shared()	9 years ago
tracefs	…
ubifs	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	9 years ago
udf	Merge branch 'work.preadv2' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	9 years ago
ufs	simple local filesystems: switch to ->iterate_shared()	9 years ago
xfs	Merge branch 'work.lookups' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	9 years ago
Kconfig	Merge tag 'ofs-pull-tag-1' of git://git.kernel.org/pub/scm/linux/kernel/git/hubcap/linux	9 years ago
Kconfig.binfmt	…
Makefile	Merge tag 'ofs-pull-tag-1' of git://git.kernel.org/pub/scm/linux/kernel/git/hubcap/linux	9 years ago
aio.c	aio: remove a pointless assignment	9 years ago
anon_inodes.c	…
attr.c	…
bad_inode.c	->getxattr(): pass dentry and inode as separate arguments	9 years ago
binfmt_aout.c	…
binfmt_elf.c	Merge branch 'work.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	9 years ago
binfmt_elf_fdpic.c	Merge branch 'work.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	9 years ago
binfmt_em86.c	…
binfmt_flat.c	…
binfmt_misc.c	…
binfmt_script.c	…
block_dev.c	fs: simplify the generic_write_sync prototype	9 years ago
buffer.c	mm, page_alloc: avoid looking up the first zone in a zonelist twice	9 years ago
char_dev.c	…
compat.c	give readdir(2)/getdents(2)/etc. uniform exclusion with lseek()	9 years ago
compat_binfmt_elf.c	…
compat_ioctl.c	…
coredump.c	coredump: only charge written data against RLIMIT_CORE	9 years ago
dax.c	direct-io: eliminate the offset argument to ->direct_IO	9 years ago
dcache.c	Merge branch 'work.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	9 years ago
dcookies.c	…
direct-io.c	fs: simplify the generic_write_sync prototype	9 years ago
drop_caches.c	…
eventfd.c	eventfd: document lockless access in eventfd_poll	9 years ago
eventpoll.c	fs: poll/select/recvmmsg: use timespec64 for timeout events	9 years ago
exec.c	Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/linux-security	9 years ago
fcntl.c	…
fhandle.c	fs/coredump: prevent fsuid=0 dumps into user-controlled directories	9 years ago
file.c	give readdir(2)/getdents(2)/etc. uniform exclusion with lseek()	9 years ago
file_table.c	…
filesystems.c	…
fs-writeback.c	mm,writeback: don't use memory reserves for wb_start_writeback	9 years ago
fs_pin.c	…
fs_struct.c	…
inode.c	parallel lookups: actual switch to rwsem	9 years ago
internal.h	…
ioctl.c	…
libfs.c	more trivial ->iterate_shared conversions	9 years ago
locks.c	…
mbcache.c	…
mount.h	…
mpage.c	mm, fs: remove remaining PAGE_CACHE_* and page_cache_{get,release} usage	9 years ago
namei.c	Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/linux-security	9 years ago
namespace.c	…
no-block.c	…
nsfs.c	…
open.c	Merge branch 'work.const-path' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	9 years ago
pipe.c	mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros	9 years ago
pnode.c	propogate_mnt: Handle the first propogated copy being a slave	9 years ago
pnode.h	…
posix_acl.c	xattr_handler: pass dentry and inode as separate arguments of ->get()	9 years ago
proc_namespace.c	vfs: show_vfsstat: do not ignore errors from show_devname method	9 years ago
read_write.c	Merge branch 'work.iov_iter' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	9 years ago
readdir.c	introduce a parallel variant of ->iterate()	9 years ago
select.c	fs: poll/select/recvmmsg: use timespec64 for timeout events	9 years ago
seq_file.c	Make file credentials available to the seqfile interfaces	9 years ago
signalfd.c	…
splice.c	Merge branch 'ovl-fixes' into for-linus	9 years ago
stack.c	…
stat.c	…
statfs.c	…
super.c	Merge branch 'master' into for-next	9 years ago
sync.c	mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros	9 years ago
timerfd.c	…
userfaultfd.c	userfaultfd: don't pin the user memory in userfaultfd_file_create()	9 years ago
utimes.c	…
xattr.c	->getxattr(): pass dentry and inode as separate arguments	9 years ago