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Andrey Ryabinin 0207df4fa1 kernel/memremap, kasan: make ZONE_DEVICE with work with KASAN 
KASAN learns about hotadded memory via the memory hotplug notifier.
devm_memremap_pages() intentionally skips calling memory hotplug
notifiers.  So KASAN doesn't know anything about new memory added by
devm_memremap_pages().  This causes a crash when KASAN tries to access
non-existent shadow memory:

 BUG: unable to handle kernel paging request at ffffed0078000000
 RIP: 0010:check_memory_region+0x82/0x1e0
 Call Trace:
  memcpy+0x1f/0x50
  pmem_do_bvec+0x163/0x720
  pmem_make_request+0x305/0xac0
  generic_make_request+0x54f/0xcf0
  submit_bio+0x9c/0x370
  submit_bh_wbc+0x4c7/0x700
  block_read_full_page+0x5ef/0x870
  do_read_cache_page+0x2b8/0xb30
  read_dev_sector+0xbd/0x3f0
  read_lba.isra.0+0x277/0x670
  efi_partition+0x41a/0x18f0
  check_partition+0x30d/0x5e9
  rescan_partitions+0x18c/0x840
  __blkdev_get+0x859/0x1060
  blkdev_get+0x23f/0x810
  __device_add_disk+0x9c8/0xde0
  pmem_attach_disk+0x9a8/0xf50
  nvdimm_bus_probe+0xf3/0x3c0
  driver_probe_device+0x493/0xbd0
  bus_for_each_drv+0x118/0x1b0
  __device_attach+0x1cd/0x2b0
  bus_probe_device+0x1ac/0x260
  device_add+0x90d/0x1380
  nd_async_device_register+0xe/0x50
  async_run_entry_fn+0xc3/0x5d0
  process_one_work+0xa0a/0x1810
  worker_thread+0x87/0xe80
  kthread+0x2d7/0x390
  ret_from_fork+0x3a/0x50

Add kasan_add_zero_shadow()/kasan_remove_zero_shadow() - post mm_init()
interface to map/unmap kasan_zero_page at requested virtual addresses.
And use it to add/remove the shadow memory for hotplugged/unplugged
device memory.

Link: http://lkml.kernel.org/r/[email protected]
Fixes: 41e94a8513 ("add devm_memremap_pages")
Signed-off-by: Andrey Ryabinin <[email protected]>
Reported-by: Dave Chinner <[email protected]>
Reviewed-by: Dan Williams <[email protected]>
Tested-by: Dan Williams <[email protected]>
Cc: Dmitry Vyukov <[email protected]>
Cc: Alexander Potapenko <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
2018-08-17 16:20:30 -07:00
..
bpf
Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next
2018-08-15 15:04:25 -07:00
cgroup
kernfs: allow creating kernfs objects with arbitrary uid/gid
2018-07-20 23:44:35 -07:00
configs
kconfig: tinyconfig: remove stale stack protector fixups
2018-06-15 07:15:28 +09:00
debug
treewide: kzalloc() -> kcalloc()
2018-06-12 16:19:22 -07:00
dma
Merge tag 'dma-mapping-4.19' of git://git.infradead.org/users/hch/dma-mapping
2018-08-14 11:11:52 -07:00
events
Merge tag 'arm64-upstream' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux
2018-08-14 16:39:13 -07:00
gcov
gcov: remove CONFIG_GCOV_FORMAT_AUTODETECT
2018-06-08 18:56:02 +09:00
irq
Merge branch 'irq-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2018-08-13 10:47:26 -07:00
livepatch
livepatch: Allow to call a custom callback when freeing shadow variables
2018-04-17 13:42:48 +02:00
locking
Merge tag 'drm-next-2018-08-15' of git://anongit.freedesktop.org/drm/drm
2018-08-15 17:39:07 -07:00
power
Merge tag 'pm-4.19-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm
2018-08-14 13:12:24 -07:00
printk
Merge tag 'drm-next-2018-08-15' of git://anongit.freedesktop.org/drm/drm
2018-08-15 17:39:07 -07:00
rcu
Merge branch 'sched-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2018-08-13 11:25:07 -07:00
sched
Merge branch 'l1tf-final' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2018-08-14 09:46:06 -07:00
time
Merge branch 'parisc-4.19-1' of git://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linux
2018-08-13 19:18:02 -07:00
trace
Merge tag 'printk-for-4.19' of git://git.kernel.org/pub/scm/linux/kernel/git/pmladek/printk
2018-08-15 11:18:53 -07:00
.gitignore
…
acct.c
kernel/acct.c: fix the acct->needcheck check in check_free_space()
2018-01-04 16:45:09 -08:00
async.c
kernel/async.c: revert "async: simplify lowest_in_progress()"
2018-02-06 18:32:44 -08:00
audit_fsnotify.c
fsnotify: add fsnotify_add_inode_mark() wrappers
2018-05-18 14:58:22 +02:00
audit_tree.c
audit: check audit_enabled in audit_tree_log_remove_rule()
2018-06-28 11:41:02 -04:00
audit_watch.c
audit: fix use-after-free in audit_add_watch
2018-07-18 11:43:36 -04:00
audit.c
audit: use ktime_get_coarse_real_ts64() for timestamps
2018-07-17 14:45:08 -04:00
audit.h
audit: track the owner of the command mutex ourselves
2018-02-23 11:22:22 -05:00
auditfilter.c
audit: rename FILTER_TYPE to FILTER_EXCLUDE
2018-06-19 10:39:54 -04:00
auditsc.c
Merge tag 'audit-pr-20180814' of git://git.kernel.org/pub/scm/linux/kernel/git/pcmoore/audit
2018-08-15 10:46:54 -07:00
backtracetest.c
…
bounds.c
…
capability.c
…
compat.c
time: Enable get/put_compat_itimerspec64 always
2018-06-24 14:39:47 +02:00
configs.c
…
context_tracking.c
…
cpu_pm.c
…
cpu.c
cpu/hotplug: Non-SMP machines do not make use of booted_once
2018-08-14 15:00:00 -07:00
crash_core.c
mm: split page_type out from _mapcount
2018-06-07 17:34:37 -07:00
crash_dump.c
…
cred.c
…
delayacct.c
delayacct: Use raw_spinlocks
2018-04-27 14:34:51 +02:00
dma.c
proc: introduce proc_create_single{,_data}
2018-05-16 07:23:35 +02:00
elfcore.c
…
exec_domain.c
proc: introduce proc_create_single{,_data}
2018-05-16 07:23:35 +02:00
exit.c
kernel: use kernel_wait4() instead of sys_wait4()
2018-04-02 20:14:51 +02:00
extable.c
extable: Make init_kernel_text() global
2018-02-21 16:54:06 +01:00
fail_function.c
bpf/error-inject/kprobes: Clear current_kprobe and enable preempt in kprobe
2018-06-21 12:33:19 +02:00
fork.c
fs: fsnotify: account fsnotify metadata to kmemcg
2018-08-17 16:20:30 -07:00
freezer.c
PM / reboot: Eliminate race between reboot and suspend
2018-08-06 12:35:20 +02:00
futex_compat.c
…
futex.c
pids: introduce find_get_task_by_vpid() helper
2018-02-06 18:32:46 -08:00
groups.c
kernel: make groups_sort calling a responsibility group_info allocators
2017-12-14 16:00:49 -08:00
hung_task.c
kernel/hung_task.c: show all hung tasks before panic
2018-06-07 17:34:39 -07:00
iomem.c
memremap: split devm_memremap_pages() and memremap() infrastructure
2018-05-15 23:08:33 -07:00
irq_work.c
irq/work: Improve the flag definitions
2018-01-08 19:43:15 +01:00
jump_label.c
jump_label: Disable jump labels in __exit code
2018-03-20 08:57:17 +01:00
kallsyms.c
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/pmladek/printk
2018-02-01 13:36:15 -08:00
kcmp.c
…
Kconfig.freezer
…
Kconfig.hz
…
Kconfig.locks
…
Kconfig.preempt
kconfig: include kernel/Kconfig.preempt from init/Kconfig
2018-08-02 08:06:54 +09:00
kcov.c
sched/core / kcov: avoid kcov_area during task switch
2018-06-15 07:55:24 +09:00
kexec_core.c
kexec: yield to scheduler when loading kimage segments
2018-06-15 07:55:24 +09:00
kexec_file.c
treewide: Use array_size() in vzalloc()
2018-06-12 16:19:22 -07:00
kexec_internal.h
…
kexec.c
kexec: add call to LSM hook in original kexec_load syscall
2018-07-16 12:31:57 -07:00
kmod.c
…
kprobes.c
kprobes: Replace %p with other pointer types
2018-06-21 17:33:42 +02:00
ksysfs.c
…
kthread.c
Merge branch 'sched-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2018-08-13 11:25:07 -07:00
latencytop.c
…
Makefile
kbuild: move bin2c back to scripts/ from scripts/basic/
2018-07-18 01:18:05 +09:00
memremap.c
kernel/memremap, kasan: make ZONE_DEVICE with work with KASAN
2018-08-17 16:20:30 -07:00
module_signing.c
…
module-internal.h
…
module.c
module: replace the existing LSM hook in init_module
2018-07-16 12:31:57 -07:00
notifier.c
…
nsproxy.c
…
padata.c
padata: add SPDX identifier
2018-01-05 18:43:00 +11:00
panic.c
Kbuild: rename CC_STACKPROTECTOR[_STRONG] config variables
2018-06-14 12:21:18 +09:00
params.c
kernel/params.c: downgrade warning for unsafe parameters
2018-04-11 10:28:37 -07:00
pid_namespace.c
Merge branch 'userns-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace
2018-04-03 19:15:32 -07:00
pid.c
xarray: add the xa_lock to the radix_tree_root
2018-04-11 10:28:39 -07:00
profile.c
…
ptrace.c
pids: introduce find_get_task_by_vpid() helper
2018-02-06 18:32:46 -08:00
range.c
…
reboot.c
PM / reboot: Eliminate race between reboot and suspend
2018-08-06 12:35:20 +02:00
relay.c
kernel/relay.c: change return type to vm_fault_t
2018-06-15 07:55:24 +09:00
resource.c
Merge tag 'libnvdimm-for-4.18' of git://git.kernel.org/pub/scm/linux/kernel/git/nvdimm/nvdimm
2018-06-08 17:21:52 -07:00
rseq.c
rseq: uapi: Declare rseq_cs field as union, update includes
2018-07-10 22:18:52 +02:00
seccomp.c
Merge tag 'audit-pr-20180605' of git://git.kernel.org/pub/scm/linux/kernel/git/pcmoore/audit
2018-06-06 16:34:00 -07:00
signal.c
signal: Remove no longer required irqsave/restore
2018-06-10 06:14:01 +02:00
smp.c
cpu/hotplug: Fix SMT supported evaluation
2018-08-07 12:25:30 +02:00
smpboot.c
smpboot: Remove cpumask from the API
2018-07-03 09:20:44 +02:00
smpboot.h
…
softirq.c
nohz: Fix missing tick reprogram when interrupting an inline softirq
2018-08-03 15:52:10 +02:00
stacktrace.c
…
stop_machine.c
Merge branch 'sched-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2018-08-13 11:25:07 -07:00
sys_ni.c
Merge branch 'core-rseq-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2018-06-10 10:17:09 -07:00
sys.c
sysinfo: Remove get_monotonic_boottime()
2018-06-19 09:56:27 +02:00
sysctl_binary.c
staging: irda: remove remaining remants of irda code removal
2018-04-16 11:26:49 +02:00
sysctl.c
sched/sysctl: Remove unused sched_time_avg_ms sysctl
2018-07-16 00:16:29 +02:00
task_work.c
locking/barriers: Convert users of lockless_dereference() to READ_ONCE()
2017-12-17 13:57:15 +01:00
taskstats.c
pids: introduce find_get_task_by_vpid() helper
2018-02-06 18:32:46 -08:00
test_kprobes.c
kprobes: Remove jprobe API implementation
2018-06-21 12:33:05 +02:00
torture.c
torture: Keep old-school dmesg format
2018-06-25 11:30:10 -07:00
tracepoint.c
tracepoints: Fix the descriptions of tracepoint_probe_register{_prio}
2018-05-28 12:49:51 -04:00
tsacct.c
…
ucount.c
headers: untangle kmemleak.h from mm.h
2018-04-05 21:36:27 -07:00
uid16.c
fs: add do_fchownat(), ksys_fchown() helpers and ksys_{,l}chown() wrappers
2018-04-02 20:15:59 +02:00
uid16.h
kernel: provide ksys_*() wrappers for syscalls called by kernel/uid16.c
2018-04-02 20:15:30 +02:00
umh.c
umh: fix race condition
2018-06-07 16:56:28 -04:00
up.c
…
user_namespace.c
treewide: kmalloc() -> kmalloc_array()
2018-06-12 16:19:22 -07:00
user-return-notifier.c
…
user.c
efivarfs: Limit the rate for non-root to read files
2018-02-22 10:21:02 -08:00
utsname_sysctl.c
…
utsname.c
uts: create "struct uts_namespace" from kmem_cache
2018-04-11 10:28:35 -07:00
watchdog_hld.c
watchdog: Reduce message verbosity
2018-08-03 12:19:08 +02:00
watchdog.c
watchdog/softlockup: Fix cpu_stop_queue_work() double-queue bug
2018-07-15 23:51:19 +02:00
workqueue_internal.h
workqueue: Set worker->desc to workqueue name by default
2018-05-18 08:47:13 -07:00
workqueue.c
treewide: kzalloc() -> kcalloc()
2018-06-12 16:19:22 -07:00