Andrey Ryabinin a5af5aa8b6 kasan, module, vmalloc: rework shadow allocation for modules ... Current approach in handling shadow memory for modules is broken. Shadow memory could be freed only after memory shadow corresponds it is no longer used. vfree() called from interrupt context could use memory its freeing to store 'struct llist_node' in it: void vfree(const void *addr) { ... if (unlikely(in_interrupt())) { struct vfree_deferred *p = this_cpu_ptr(&vfree_deferred); if (llist_add((struct llist_node *)addr, &p->list)) schedule_work(&p->wq); Later this list node used in free_work() which actually frees memory. Currently module_memfree() called in interrupt context will free shadow before freeing module's memory which could provoke kernel crash. So shadow memory should be freed after module's memory. However, such deallocation order could race with kasan_module_alloc() in module_alloc(). Free shadow right before releasing vm area. At this point vfree()'d memory is not used anymore and yet not available for other allocations. New VM_KASAN flag used to indicate that vm area has dynamically allocated shadow memory so kasan frees shadow only if it was previously allocated. Signed-off-by: Andrey Ryabinin <a.ryabinin@samsung.com> Acked-by: Rusty Russell <rusty@rustcorp.com.au> Cc: Dmitry Vyukov <dvyukov@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>		2015-03-12 18:46:08 -07:00
..
bpf	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net	2015-01-27 13:55:36 -08:00
configs
debug	debug: prevent entering debug mode on panic/exception.	2015-02-19 12:39:03 -06:00
events	Merge branch 'perf-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2015-02-16 14:58:12 -08:00
gcov	kbuild,gcov: simplify kernel/gcov/Makefile more	2015-01-09 17:25:44 +01:00
irq	genirq / PM: Add flag for shared NO_SUSPEND interrupt lines	2015-03-04 21:42:19 +01:00
livepatch	livepatch: fix RCU usage in klp_find_external_symbol()	2015-03-03 00:22:55 +01:00
locking	locking/rtmutex: Set state back to running on error	2015-03-01 09:45:06 +01:00
power	PM / sleep: Re-implement suspend-to-idle handling	2015-02-13 23:49:36 +01:00
printk	console: Fix console name size mismatch	2015-03-07 03:39:55 +01:00
rcu	Merge branches 'core-urgent-for-linus' and 'irq-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2015-02-21 10:36:06 -08:00
sched	cpuidle / sleep: Use broadcast timer for states that stop local timer	2015-03-05 23:13:19 +01:00
time	Merge branch 'timers-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2015-02-21 11:05:22 -08:00
trace	ftrace: Fix ftrace enable ordering of sysctl ftrace_enabled	2015-03-09 10:55:34 -04:00
.gitignore
acct.c	new fs_pin killing logics	2015-01-25 23:17:28 -05:00
async.c
audit_tree.c	fsnotify: unify inode and mount marks handling	2014-12-13 12:42:53 -08:00
audit_watch.c
audit.c	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net	2014-12-30 10:45:47 -08:00
audit.h	audit: replace getname()/putname() hacks with reference counters	2015-01-23 00:23:58 -05:00
auditfilter.c	Merge branch 'upstream' of git://git.infradead.org/users/pcmoore/audit	2015-02-11 20:07:47 -08:00
auditsc.c	Merge branch 'getname2' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2015-02-17 15:27:47 -08:00
backtracetest.c
bounds.c
capability.c
cgroup_freezer.c
cgroup.c	kernfs: remove KERNFS_STATIC_NAME	2015-02-13 21:21:36 -08:00
compat.c	all arches, signal: move restart_block to struct task_struct	2015-02-12 18:54:12 -08:00
configs.c
context_tracking.c
cpu_pm.c
cpu.c	hotplugcpu: Avoid deadlocks by waking active_writer	2015-01-06 11:01:14 -08:00
cpuset.c	cpuset: Fix cpuset sched_relax_domain_level	2015-03-02 11:55:04 -05:00
crash_dump.c
cred.c
delayacct.c
dma.c
elfcore.c
exec_domain.c
exit.c	oom, PM: make OOM detection in the freezer path raceless	2015-02-11 17:06:03 -08:00
extable.c
fork.c	mm: do not use mm->nr_pmds on !MMU configurations	2015-02-12 18:54:10 -08:00
freezer.c
futex_compat.c
futex.c	all arches, signal: move restart_block to struct task_struct	2015-02-12 18:54:12 -08:00
groups.c
hung_task.c
irq_work.c
jump_label.c
kallsyms.c
kcmp.c
Kconfig.freezer
Kconfig.hz
Kconfig.locks	locking/mcs: Better differentiate between MCS variants	2015-01-14 15:07:32 +01:00
Kconfig.preempt
kexec.c	kexec: simplify conditional	2015-02-17 14:34:51 -08:00
kmod.c	usermodehelper: kill the kmod_thread_locker logic	2014-12-10 17:41:17 -08:00
kprobes.c	kprobes: makes kprobes/enabled works correctly for optimized kprobes.	2015-02-13 21:21:42 -08:00
ksysfs.c
kthread.c
latencytop.c
Makefile	Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/linux-security	2015-02-11 20:25:11 -08:00
module_signing.c
module-internal.h
module.c	kasan, module, vmalloc: rework shadow allocation for modules	2015-03-12 18:46:08 -07:00
notifier.c	rcu: Make SRCU optional by using CONFIG_SRCU	2015-01-06 11:04:29 -08:00
nsproxy.c
padata.c	padata: use %*pb[l] to print bitmaps including cpumasks and nodemasks	2015-02-13 21:21:38 -08:00
panic.c	livepatch: kernel: add TAINT_LIVEPATCH	2014-12-22 15:40:48 +01:00
params.c	param: fix uninitialized read with CONFIG_DEBUG_LOCK_ALLOC	2015-01-20 11:38:31 +10:30
pid_namespace.c	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2014-12-16 15:53:03 -08:00
pid.c	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2014-12-16 15:53:03 -08:00
profile.c	profile: use %*pb[l] to print bitmaps including cpumasks and nodemasks	2015-02-13 21:21:38 -08:00
ptrace.c	ptrace: remove linux/compat.h inclusion under CONFIG_COMPAT	2015-02-17 14:34:51 -08:00
range.c	kernel: avoid overflow in cmp_range	2015-01-17 10:02:23 +13:00
reboot.c
relay.c
resource.c	resources: Move struct resource_list_entry from ACPI into resource core	2015-02-05 15:09:25 +01:00
seccomp.c	seccomp: cap SECCOMP_RET_ERRNO data to MAX_ERRNO	2015-02-17 14:34:55 -08:00
signal.c	signal: use current->state helpers	2015-02-17 14:34:51 -08:00
smp.c
smpboot.c	smpboot: Add missing get_online_cpus() in smpboot_register_percpu_thread()	2015-01-23 11:33:51 +01:00
smpboot.h
softirq.c	Merge branch 'locking-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2015-02-09 15:24:03 -08:00
stacktrace.c	stacktrace: introduce snprint_stack_trace for buffer output	2014-12-13 12:42:48 -08:00
stop_machine.c
sys_ni.c	syscalls: implement execveat() system call	2014-12-13 12:42:51 -08:00
sys.c	kernel/sys.c: fix UNAME26 for 4.0	2015-02-28 09:57:51 -08:00
sysctl_binary.c	kernel: add panic_on_warn	2014-12-10 17:41:10 -08:00
sysctl.c	mm, hugetlb: remove unnecessary lower bound on sysctl handlers"?	2015-02-10 14:30:34 -08:00
system_certificates.S
system_keyring.c
task_work.c
taskstats.c	netlink: make nlmsg_end() and genlmsg_end() void	2015-01-18 01:03:45 -05:00
test_kprobes.c
torture.c
tracepoint.c
tsacct.c
uid16.c
up.c
user_namespace.c	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace	2014-12-17 12:31:40 -08:00
user-return-notifier.c
user.c	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace	2014-12-17 12:31:40 -08:00
utsname_sysctl.c
utsname.c
watchdog.c	kernel/sched/clock.c: add another clock for use with the soft lockup watchdog	2015-02-12 18:54:13 -08:00
workqueue_internal.h
workqueue.c	workqueue: fix hang involving racing cancel[_delayed]_work_sync()'s for PREEMPT_NONE	2015-03-05 08:04:13 -05:00