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Jia Zhang 595dd46ebf vfs/proc/kcore, x86/mm/kcore: Fix SMAP fault when dumping vsyscall user page 
Commit:

  df04abfd181a ("fs/proc/kcore.c: Add bounce buffer for ktext data")

... introduced a bounce buffer to work around CONFIG_HARDENED_USERCOPY=y.
However, accessing the vsyscall user page will cause an SMAP fault.

Replace memcpy() with copy_from_user() to fix this bug works, but adding
a common way to handle this sort of user page may be useful for future.

Currently, only vsyscall page requires KCORE_USER.

Signed-off-by: Jia Zhang <zhang.jia@linux.alibaba.com>
Reviewed-by: Jiri Olsa <jolsa@kernel.org>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: jolsa@redhat.com
Link: http://lkml.kernel.org/r/1518446694-21124-2-git-send-email-zhang.jia@linux.alibaba.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
2018-02-13 09:15:58 +01:00
..
9p
fs/*/Kconfig: drop links to 404-compliant http://acl.bestbits.at
2018-01-01 12:45:37 -07:00
adfs
Rename superblock flags (MS_xyz -> SB_xyz)
2017-11-27 13:05:09 -08:00
affs
iversion: Rename make inode_cmp_iversion{+raw} to inode_eq_iversion{+raw}
2018-02-01 08:15:25 -05:00
afs
afs: Support the AFS dynamic root
2018-02-06 14:43:37 +00:00
autofs4
Merge branch 'userns-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace
2018-01-30 14:43:12 -08:00
befs
befs: Define usercopy region in befs_inode_cache slab cache
2018-01-15 12:07:54 -08:00
bfs
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
btrfs
Documentation updates for 4.16. New stuff includes refcount_t
2018-01-31 19:25:25 -08:00
cachefiles
fs: annotate ->poll() instances
2017-11-27 16:20:05 -05:00
ceph
Things have been very quiet on the rbd side, as work continues on the
2018-02-08 11:38:59 -08:00
cifs
Currently, hardened usercopy performs dynamic bounds checking on slab
2018-02-03 16:25:42 -08:00
coda
Merge branch 'misc.poll' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2018-01-30 17:58:07 -08:00
configfs
configfs: make ci_type field, some pointers and function arguments const
2017-10-19 16:15:16 +02:00
cramfs
cramfs: better MTD dependency expression
2018-02-08 11:37:31 -08:00
crypto
fscrypt: fix build with pre-4.6 gcc versions
2018-02-01 10:51:18 -05:00
debugfs
fs: annotate ->poll() instances
2017-11-27 16:20:05 -05:00
devpts
devpts: fix error handling in devpts_mntget()
2018-01-31 08:48:37 -08:00
dlm
Merge branch 'work.sock_recvmsg' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2018-01-30 18:59:03 -08:00
ecryptfs
Merge branch 'misc.poll' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2018-01-30 17:58:07 -08:00
efivarfs
VFS: Kill off s_options and helpers
2017-07-11 06:09:21 -04:00
efs
Rename superblock flags (MS_xyz -> SB_xyz)
2017-11-27 13:05:09 -08:00
exofs
iversion.h related cleanup for v4.16
2018-02-07 14:25:22 -08:00
exportfs
…
ext2
iversion.h related cleanup for v4.16
2018-02-07 14:25:22 -08:00
ext4
iversion.h related cleanup for v4.16
2018-02-07 14:25:22 -08:00
f2fs
Refactor support for encrypted symlinks to move common code to fscrypt.
2018-02-04 10:43:12 -08:00
fat
iversion: Rename make inode_cmp_iversion{+raw} to inode_eq_iversion{+raw}
2018-02-01 08:15:25 -05:00
freevxfs
vxfs: Define usercopy region in vxfs_inode slab cache
2018-01-15 12:07:57 -08:00
fscache
AFS development
2017-11-16 11:41:22 -08:00
fuse
Merge branch 'misc.poll' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2018-01-30 17:58:07 -08:00
gfs2
gfs2: Glock dump performance regression fix
2018-02-01 11:27:11 -07:00
hfs
Rename superblock flags (MS_xyz -> SB_xyz)
2017-11-27 13:05:09 -08:00
hfsplus
hfsplus: honor setgid flag on directories
2018-02-06 18:32:45 -08:00
hostfs
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
hpfs
hpfs: don't bother with the i_version counter or f_version
2017-12-10 12:58:18 -08:00
hugetlbfs
hugetlb: implement memfd sealing
2018-01-31 17:18:39 -08:00
isofs
Rename superblock flags (MS_xyz -> SB_xyz)
2017-11-27 13:05:09 -08:00
jbd2
jbd2: fix sphinx kernel-doc build warnings
2018-01-10 00:27:29 -05:00
jffs2
Documentation updates for 4.16. New stuff includes refcount_t
2018-01-31 19:25:25 -08:00
jfs
Currently, hardened usercopy performs dynamic bounds checking on slab
2018-02-03 16:25:42 -08:00
kernfs
Merge branch 'misc.poll' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2018-01-30 17:58:07 -08:00
lockd
lockd: Fix server refcounting
2018-01-24 17:33:57 -05:00
minix
Rename superblock flags (MS_xyz -> SB_xyz)
2017-11-27 13:05:09 -08:00
nfs
iversion: Rename make inode_cmp_iversion{+raw} to inode_eq_iversion{+raw}
2018-02-01 08:15:25 -05:00
nfs_common
lockd: fix "list_add double add" caused by legacy signal interface
2017-11-27 16:45:11 -05:00
nfsd
This request is late, apologies.
2018-02-08 15:18:32 -08:00
nilfs2
nilfs2: use time64_t internally
2018-02-06 18:32:45 -08:00
nls
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
notify
Merge branch 'misc.poll' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2018-01-30 17:58:07 -08:00
ntfs
ntfs: remove i_version handling
2018-01-01 10:09:33 -05:00
ocfs2
iversion: Rename make inode_cmp_iversion{+raw} to inode_eq_iversion{+raw}
2018-02-01 08:15:25 -05:00
omfs
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
openpromfs
Rename superblock flags (MS_xyz -> SB_xyz)
2017-11-27 13:05:09 -08:00
orangefs
Mostly cleanups, but three bug fixes:
2018-02-08 12:20:41 -08:00
overlayfs
ovl: check ERR_PTR() return value from ovl_encode_fh()
2018-02-05 09:50:29 +01:00
proc
vfs/proc/kcore, x86/mm/kcore: Fix SMAP fault when dumping vsyscall user page
2018-02-13 09:15:58 +01:00
pstore
fs: pstore: remove unused hardirq.h
2017-11-28 16:39:09 -08:00
qnx4
Rename superblock flags (MS_xyz -> SB_xyz)
2017-11-27 13:05:09 -08:00
qnx6
Rename superblock flags (MS_xyz -> SB_xyz)
2017-11-27 13:05:09 -08:00
quota
quota: Check for register_shrinker() failure.
2017-11-29 16:46:48 +01:00
ramfs
mm: make pagevec_lookup() update index
2017-09-06 17:27:26 -07:00
reiserfs
fs/*/Kconfig: drop links to 404-compliant http://acl.bestbits.at
2018-01-01 12:45:37 -07:00
romfs
Rename superblock flags (MS_xyz -> SB_xyz)
2017-11-27 13:05:09 -08:00
squashfs
Rename superblock flags (MS_xyz -> SB_xyz)
2017-11-27 13:05:09 -08:00
sysfs
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/pmladek/printk
2018-02-01 13:36:15 -08:00
sysv
Rename superblock flags (MS_xyz -> SB_xyz)
2017-11-27 13:05:09 -08:00
tracefs
VFS: Don't use save/replace_mount_options if not using generic_show_options
2017-07-06 03:31:46 -04:00
ubifs
Refactor support for encrypted symlinks to move common code to fscrypt.
2018-02-04 10:43:12 -08:00
udf
udf: Sanitize nanoseconds for time stamps
2017-12-19 08:11:01 +01:00
ufs
iversion.h related cleanup for v4.16
2018-02-07 14:25:22 -08:00
xfs
Changes since last update:
2018-02-05 13:35:56 -08:00
aio.c
Merge branch 'misc.compat' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2017-11-17 11:54:55 -08:00
anon_inodes.c
…
attr.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
bad_inode.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
binfmt_aout.c
fs: fix kernel_read prototype
2017-09-04 19:05:15 -04:00
binfmt_elf_fdpic.c
Merge branch 'work.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2017-11-17 12:54:01 -08:00
binfmt_elf.c
elf: fix NT_FILE integer overflow
2018-02-06 18:32:45 -08:00
binfmt_em86.c
…
binfmt_flat.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
binfmt_misc.c
fs/binfmt_misc.c: node could be NULL when evicting inode
2017-10-13 16:18:33 -07:00
binfmt_script.c
exec: load_script: kill the onstack interp[BINPRM_BUF_SIZE] array
2017-10-03 17:54:25 -07:00
block_dev.c
Merge branch 'for-4.15/block' of git://git.kernel.dk/linux-block
2017-11-14 15:32:19 -08:00
buffer.c
Merge branch 'work.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2018-01-31 09:25:20 -08:00
char_dev.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
compat_binfmt_elf.c
…
compat_ioctl.c
fs: compat_ioctl: add new DVB demux ioctls
2017-12-28 11:17:29 -05:00
compat.c
…
coredump.c
Merge branch 'misc.compat' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2017-11-17 11:54:55 -08:00
dax.c
Only miscellaneous cleanups and bug fixes for ext4 this cycle.
2018-02-03 13:49:22 -08:00
dcache.c
Merge branch 'overlayfs-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/vfs
2018-02-05 13:05:20 -08:00
dcookies.c
…
direct-io.c
iomap: report collisions between directio and buffered writes to userspace
2018-01-08 10:41:39 -08:00
drop_caches.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
eventfd.c
Merge branch 'work.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2018-01-31 09:25:20 -08:00
eventpoll.c
eventpoll: no need to mask the result of epi_item_poll() again
2017-11-28 19:56:15 -05:00
exec.c
exec: Weaken dumpability for secureexec
2018-01-03 10:13:36 -08:00
fcntl.c
shmem: rename functions that are memfd-related
2018-01-31 17:18:39 -08:00
fhandle.c
vfs: Copy struct mount.mnt_id to userspace using put_user()
2018-01-15 12:07:51 -08:00
file_table.c
vfs: remove unused hardirq.h
2017-12-07 14:23:30 -05:00
file.c
Merge branch 'work.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2018-01-31 09:25:20 -08:00
filesystems.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
fs_pin.c
Merge branch 'linus' into locking/core, to resolve conflicts
2017-11-07 10:32:44 +01:00
fs_struct.c
…
fs-writeback.c
writeback: update comment in inode_io_list_move_locked
2018-01-06 09:18:00 -07:00
inode.c
vfs: remove might_sleep() from clear_inode()
2018-02-06 18:32:47 -08:00
internal.h
fs: expose do_unlinkat for built-in callers
2017-11-10 08:48:46 -05:00
ioctl.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
iomap.c
iomap: warn on zero-length mappings
2018-01-29 07:27:24 -08:00
Kconfig
libnvdimm for 4.16
2018-02-06 10:41:33 -08:00
Kconfig.binfmt
ARM: enable elf_fdpic on systems with an MMU
2017-09-10 19:31:46 -04:00
libfs.c
Rename superblock flags (MS_xyz -> SB_xyz)
2017-11-27 13:05:09 -08:00
locks.c
This request is late, apologies.
2018-02-08 15:18:32 -08:00
Makefile
ncpfs: move net/ncpfs to drivers/staging/ncpfs
2017-11-28 13:55:01 +01:00
mbcache.c
mbcache: make sure c_entry_count is not decremented past zero
2018-01-09 23:57:52 -05:00
mount.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
mpage.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
namei.c
Merge branch 'work.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2018-01-31 09:25:20 -08:00
namespace.c
VFS: Handle lazytime in do_mount()
2017-12-09 20:16:33 -05:00
no-block.c
…
nsfs.c
nsfs: generalize ns_get_path() for path resolution with a task
2017-12-31 16:12:23 +01:00
open.c
ovl: don't allow writing ioctl on lower layer
2017-09-05 12:53:12 +02:00
pipe.c
pipe: read buffer limits atomically
2018-02-06 18:32:48 -08:00
pnode.c
mnt: Make propagate_umount less slow for overlapping mount propagation trees
2017-05-23 08:41:17 -05:00
pnode.h
…
posix_acl.c
posix_acl: convert posix_acl.a_refcount from atomic_t to refcount_t
2018-01-02 19:27:28 -08:00
proc_namespace.c
Merge branch 'misc.poll' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2018-01-30 17:58:07 -08:00
read_write.c
Merge branch 'work.iov_iter' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2017-11-17 12:08:18 -08:00
readdir.c
Merge branch 'linus' into locking/core, to resolve conflicts
2017-11-07 10:32:44 +01:00
select.c
make kernel-side POLL... arch-independent
2017-11-29 19:00:41 -05:00
seq_file.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
signalfd.c
fs: annotate ->poll() instances
2017-11-27 16:20:05 -05:00
splice.c
locking/atomics: COCCINELLE/treewide: Convert trivial ACCESS_ONCE() patterns to READ_ONCE()/WRITE_ONCE()
2017-10-25 11:01:08 +02:00
stack.c
…
stat.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
statfs.c
Rename superblock flags (MS_xyz -> SB_xyz)
2017-11-27 13:05:09 -08:00
super.c
Merge branch 'work.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2018-01-31 09:25:20 -08:00
sync.c
Merge branch 'for-4.15/block' of git://git.kernel.dk/linux-block
2017-11-14 15:32:19 -08:00
timerfd.c
fs: annotate ->poll() instances
2017-11-27 16:20:05 -05:00
userfaultfd.c
userfaultfd: convert to use anon_inode_getfd()
2018-01-31 17:18:39 -08:00
utimes.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
xattr.c
lsm: fix smack_inode_removexattr and xattr_getsecurity memleak
2017-10-04 18:03:15 +11:00