linux-kernelorg-stable/fs
Peter Xu efd4149342 mm/smaps: don't access young/dirty bit if pte unpresent
These bits should only be valid when the ptes are present.  Introducing
two booleans for it and set it to false when !pte_present() for both pte
and pmd accountings.

The bug is found during code reading and no real world issue reported, but
logically such an error can cause incorrect readings for either smaps or
smaps_rollup output on quite a few fields.

For example, it could cause over-estimate on values like Shared_Dirty,
Private_Dirty, Referenced.  Or it could also cause under-estimate on
values like LazyFree, Shared_Clean, Private_Clean.

Link: https://lkml.kernel.org/r/20220805160003.58929-1-peterx@redhat.com
Fixes: b1d4d9e0cb ("proc/smaps: carefully handle migration entries")
Fixes: c94b6923fa ("/proc/PID/smaps: Add PMD migration entry parsing")
Signed-off-by: Peter Xu <peterx@redhat.com>
Reviewed-by: Vlastimil Babka <vbabka@suse.cz>
Reviewed-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Yang Shi <shy828301@gmail.com>
Cc: Konstantin Khlebnikov <khlebnikov@openvz.org>
Cc: Huang Ying <ying.huang@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
2022-08-20 15:17:45 -07:00
..
9p
adfs
affs
afs afs: Enable multipage folio support 2022-08-13 17:20:51 -07:00
autofs
befs
bfs
btrfs
cachefiles
ceph
cifs 8 cifs/smb3 fixes, mostly restructuring/cleanup, including two for stable 2022-08-13 17:31:18 -07:00
coda
configfs
cramfs
crypto
debugfs
devpts
dlm
ecryptfs
efivarfs
efs
erofs
exfat
exportfs
ext2
ext4
f2fs
fat
freevxfs
fscache
fuse
gfs2 New code for 6.0: 2022-08-11 13:11:49 -07:00
hfs
hfsplus
hostfs
hpfs
hugetlbfs
iomap New code for 6.0: 2022-08-11 13:11:49 -07:00
isofs
jbd2
jffs2
jfs
kernfs
ksmbd
lockd
minix
netfs
nfs
nfs_common
nfsd
nilfs2
nls
notify
ntfs
ntfs3
ocfs2
omfs
openpromfs
orangefs
overlayfs
proc mm/smaps: don't access young/dirty bit if pte unpresent 2022-08-20 15:17:45 -07:00
pstore
qnx4
qnx6
quota
ramfs
reiserfs
romfs
smbfs_common
squashfs
sysfs
sysv
tracefs
ubifs
udf
ufs
unicode
vboxsf
verity
xfs New code for 6.0: 2022-08-13 13:50:11 -07:00
zonefs New code for 6.0: 2022-08-11 13:11:49 -07:00
Kconfig
Kconfig.binfmt
Makefile
aio.c
anon_inodes.c
attr.c
bad_inode.c
binfmt_aout.c
binfmt_elf.c
binfmt_elf_fdpic.c
binfmt_elf_test.c
binfmt_flat.c
binfmt_misc.c
binfmt_script.c
buffer.c
char_dev.c
compat_binfmt_elf.c
coredump.c
d_path.c
dax.c
dcache.c
direct-io.c
drop_caches.c
eventfd.c
eventpoll.c
exec.c
fcntl.c
fhandle.c
file.c
file_table.c
filesystems.c
fs-writeback.c
fs_context.c
fs_parser.c
fs_pin.c
fs_struct.c
fs_types.c
fsopen.c
init.c
inode.c
internal.h
ioctl.c
kernel_read_file.c
libfs.c
locks.c
mbcache.c
mount.h
mpage.c
namei.c
namespace.c
no-block.c
nsfs.c
open.c
pipe.c
pnode.c
pnode.h
posix_acl.c
proc_namespace.c
read_write.c
readdir.c
remap_range.c
select.c
seq_file.c
signalfd.c
splice.c
stack.c
stat.c
statfs.c
super.c
sync.c
sysctls.c
timerfd.c
userfaultfd.c
utimes.c
xattr.c