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mm, kasan: add a ksize() test

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

Signed-off-by: Alexander Potapenko <glider@google.com>
Acked-by: Andrey 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: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Alexander Potapenko 2016-05-20 16:59:17 -07:00 committed by Linus Torvalds
parent 4ebb31a42f
commit 96fe805fb6
1 changed files with 20 additions and 0 deletions
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20
lib/test_kasan.c
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@ -344,6 +344,25 @@ static noinline void __init kasan_stack_oob(void)
*(volatile char *)p; *(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) static int __init kmalloc_tests_init(void)
{ {
kmalloc_oob_right(); kmalloc_oob_right();
@ -367,6 +386,7 @@ static int __init kmalloc_tests_init(void)
kmem_cache_oob(); kmem_cache_oob();
kasan_stack_oob(); kasan_stack_oob();
kasan_global_oob(); kasan_global_oob();
ksize_unpoisons_memory();
return -EAGAIN; return -EAGAIN;
} }