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Commit 96fe805f authored by Alexander Potapenko's avatar Alexander Potapenko Committed by Linus Torvalds
Browse files

mm, kasan: add a ksize() test 



Add a test that makes sure ksize() unpoisons the whole chunk.

Signed-off-by: default avatarAlexander Potapenko <glider@google.com>
Acked-by: default avatarAndrey Ryabinin <aryabinin@virtuozzo.com>
Cc: Andrey Konovalov <adech.fo@gmail.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Christoph Lameter <cl@linux.com>
Cc: Konstantin Serebryany <kcc@google.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 4ebb31a4

lib/test_kasan.c

+20 −0
Original line number Diff line number Diff line
@@ -344,6 +344,25 @@ static noinline void __init kasan_stack_oob(void) 
	*(volatile char *)p;

}



static noinline void __init ksize_unpoisons_memory(void)

{

	char *ptr;

	size_t size = 123, real_size = size;



	pr_info("ksize() unpoisons the whole allocated chunk\n");

	ptr = kmalloc(size, GFP_KERNEL);

	if (!ptr) {

		pr_err("Allocation failed\n");

		return;

	}

	real_size = ksize(ptr);

	/* This access doesn't trigger an error. */

	ptr[size] = 'x';

	/* This one does. */

	ptr[real_size] = 'y';

	kfree(ptr);

}



static int __init kmalloc_tests_init(void)

{

	kmalloc_oob_right();
@@ -367,6 +386,7 @@ static int __init kmalloc_tests_init(void) 
	kmem_cache_oob();

	kasan_stack_oob();

	kasan_global_oob();

	ksize_unpoisons_memory();

	return -EAGAIN;

}