Mark Rutland 3eda69c92d kernel/fork.c: detect early free of a live mm ... KASAN splats indicate that in some cases we free a live mm, then continue to access it, with potentially disastrous results. This is likely due to a mismatched mmdrop() somewhere in the kernel, but so far the culprit remains elusive. Let's have __mmdrop() verify that the mm isn't live for the current task, similar to the existing check for init_mm. This way, we can catch this class of issue earlier, and without requiring KASAN. Currently, idle_task_exit() leaves active_mm stale after it switches to init_mm. This isn't harmful, but will trigger the new assertions, so we must adjust idle_task_exit() to update active_mm. Link: http://lkml.kernel.org/r/20180312140103.19235-1-mark.rutland@arm.com Signed-off-by: Mark Rutland <mark.rutland@arm.com> Reviewed-by: Andrew Morton <akpm@linux-foundation.org> Cc: Ingo Molnar <mingo@kernel.org> Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com> Cc: Michal Hocko <mhocko@suse.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Rik van Riel <riel@redhat.com> Cc: Will Deacon <will.deacon@arm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>		2018-04-05 21:36:27 -07:00
..
bpf	bpf: Post-hooks for sys_bind	2018-03-31 02:16:26 +02:00
cgroup	Merge branch 'for-4.17' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/wq	2018-04-03 18:00:13 -07:00
configs	KVM changes for 4.16	2018-02-10 13:16:35 -08:00
debug
events	perf/x86/pt, coresight: Clean up address filter structure	2018-03-29 16:07:22 +02:00
gcov
irq	genirq: Make GENERIC_IRQ_MULTI_HANDLER depend on !MULTI_IRQ_HANDLER	2018-04-04 12:04:28 +02:00
livepatch	Merge branch 'for-4.16/remove-immediate' into for-linus	2018-01-31 16:36:38 +01:00
locking	locking/rwsem: Add DEBUG_RWSEMS to look for lock/unlock mismatches	2018-03-31 07:30:50 +02:00
power	Power management updates for 4.17-rc1	2018-04-03 10:45:39 -07:00
printk	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/pmladek/printk	2018-03-01 10:06:39 -08:00
rcu	Merge branches 'fixes.2018.02.23a', 'srcu.2018.02.20a' and 'torture.2018.02.20a' into HEAD	2018-02-23 15:15:41 -08:00
sched	kernel/fork.c: detect early free of a live mm	2018-04-05 21:36:27 -07:00
time	Merge branch 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2018-04-04 14:50:29 -07:00
trace	Merge branch 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2018-04-04 14:50:29 -07:00
.gitignore
acct.c
async.c	kernel/async.c: revert "async: simplify lowest_in_progress()"	2018-02-06 18:32:44 -08:00
audit_fsnotify.c
audit_tree.c
audit_watch.c
audit.c	net: Drop pernet_operations::async	2018-03-27 13:18:09 -04:00
audit.h
auditfilter.c
auditsc.c
backtracetest.c
bounds.c
capability.c
compat.c	mm: add kernel_move_pages() helper, move compat syscall to mm/migrate.c	2018-04-02 20:15:32 +02:00
configs.c
context_tracking.c
cpu_pm.c
cpu.c	cpu/hotplug: Fix unused function warning	2018-03-15 20:34:40 +01:00
crash_core.c	kdump: write correct address of mem_section into vmcoreinfo	2018-01-13 10:42:48 -08:00
crash_dump.c
cred.c
delayacct.c	delayacct: Account blkio completion on the correct task	2018-01-16 03:29:36 +01:00
dma.c
elfcore.c
exec_domain.c
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	error-injection: Fix to prohibit jump optimization	2018-03-12 16:16:00 +01:00
fork.c	kernel/fork.c: detect early free of a live mm	2018-04-05 21:36:27 -07:00
freezer.c
futex_compat.c
futex.c	pids: introduce find_get_task_by_vpid() helper	2018-02-06 18:32:46 -08:00
groups.c
hung_task.c
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
kcov.c	kcov: detect double association with a single task	2018-02-06 18:32:46 -08:00
kexec_core.c
kexec_file.c
kexec_internal.h
kexec.c	kexec: call do_kexec_load() in compat syscall directly	2018-04-02 20:15:01 +02:00
kmod.c
kprobes.c	kprobes: Propagate error from disarm_kprobe_ftrace()	2018-02-16 09:12:58 +01:00
ksysfs.c
kthread.c
latencytop.c
Makefile	error-injection: Support fault injection framework	2018-01-12 17:33:38 -08:00
memremap.c	kernel/memremap: Remove stale devres_free() call	2018-03-06 10:58:54 -08:00
module_signing.c
module-internal.h
module.c	arch: remove obsolete architecture ports	2018-04-02 20:20:12 -07:00
notifier.c
nsproxy.c
padata.c
panic.c	Merge branch 'core-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2018-04-02 09:08:26 -07:00
params.c
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	pids: introduce find_get_task_by_vpid() helper	2018-02-06 18:32:46 -08:00
profile.c
ptrace.c	pids: introduce find_get_task_by_vpid() helper	2018-02-06 18:32:46 -08:00
range.c
reboot.c
relay.c	kernel/relay.c: limit kmalloc size to KMALLOC_MAX_SIZE	2018-02-21 15:35:43 -08:00
resource.c	Merge branch 'akpm' (patches from Andrew)	2018-02-06 22:15:42 -08:00
seccomp.c	- Fix seccomp GET_METADATA to deal with field sizes correctly (Tycho Andersen)	2018-02-22 10:50:24 -08:00
signal.c	arm64 updates for 4.17	2018-04-04 16:01:43 -07:00
smp.c
smpboot.c
smpboot.h
softirq.c	softirq: Consolidate common code in tasklet_[hi]_action()	2018-03-09 11:50:55 +01:00
stacktrace.c
stop_machine.c
sys_ni.c	kernel/sys_ni: remove {sys_,sys_compat} from cond_syscall definitions	2018-04-02 20:16:20 +02:00
sys.c	kernel: add ksys_setsid() helper; remove in-kernel call to sys_setsid()	2018-04-02 20:16:06 +02:00
sysctl_binary.c
sysctl.c	firmware: enable run time change of forcing fallback loader	2018-03-20 09:28:47 +01:00
task_work.c
taskstats.c	pids: introduce find_get_task_by_vpid() helper	2018-02-06 18:32:46 -08:00
test_kprobes.c
torture.c
tracepoint.c
tsacct.c
ucount.c
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	kernel: use kernel_wait4() instead of sys_wait4()	2018-04-02 20:14:51 +02:00
up.c
user_namespace.c
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
watchdog_hld.c
watchdog.c
workqueue_internal.h
workqueue.c	Merge branch 'for-4.17' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/wq	2018-04-03 18:00:13 -07:00