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kasan: support use-after-scope detection

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Gcc revision 241896 implements use-after-scope detection.  Will be
available in gcc 7.  Support it in KASAN.

Gcc emits 2 new callbacks to poison/unpoison large stack objects when
they go in/out of scope.  Implement the callbacks and add a test.

[[email protected]: v3]
  Link: http://lkml.kernel.org/r/[email protected]
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Dmitry Vyukov <[email protected]>
Acked-by: Andrey Ryabinin <[email protected]>
Cc: Alexander Potapenko <[email protected]>
Cc: <[email protected]>	[4.0+]
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Dmitry Vyukov 2016-11-30 15:54:16 -08:00 • committed by Linus Torvalds
commit 828347f8f9
4 changed files with 52 additions and 0 deletions
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19
mm/kasan/kasan.c
View file

@ -764,6 +764,25 @@ EXPORT_SYMBOL(__asan_storeN_noabort);
void __asan_handle_no_return(void) {}
EXPORT_SYMBOL(__asan_handle_no_return);
/* Emitted by compiler to poison large objects when they go out of scope. */
void __asan_poison_stack_memory(const void *addr, size_t size)
{
/*
* Addr is KASAN_SHADOW_SCALE_SIZE-aligned and the object is surrounded
* by redzones, so we simply round up size to simplify logic.
*/
kasan_poison_shadow(addr, round_up(size, KASAN_SHADOW_SCALE_SIZE),
KASAN_USE_AFTER_SCOPE);
}
EXPORT_SYMBOL(__asan_poison_stack_memory);
/* Emitted by compiler to unpoison large objects when they go into scope. */
void __asan_unpoison_stack_memory(const void *addr, size_t size)
{
kasan_unpoison_shadow(addr, size);
}
EXPORT_SYMBOL(__asan_unpoison_stack_memory);
#ifdef CONFIG_MEMORY_HOTPLUG
static int kasan_mem_notifier(struct notifier_block *nb,
unsigned long action, void *data)

1
mm/kasan/kasan.h
View file

@ -21,6 +21,7 @@
#define KASAN_STACK_MID 0xF2
#define KASAN_STACK_RIGHT 0xF3
#define KASAN_STACK_PARTIAL 0xF4
#define KASAN_USE_AFTER_SCOPE 0xF8
/* Don't break randconfig/all*config builds */
#ifndef KASAN_ABI_VERSION

3
mm/kasan/report.c
View file

@ -90,6 +90,9 @@ static void print_error_description(struct kasan_access_info *info)
case KASAN_KMALLOC_FREE:
bug_type = "use-after-free";
break;
case KASAN_USE_AFTER_SCOPE:
bug_type = "use-after-scope";
break;
}
pr_err("BUG: KASAN: %s in %pS at addr %p\n",