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kasan: add test for invalid size in memmove

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Test negative size in memmove in order to verify whether it correctly get
KASAN report.

Casting negative numbers to size_t would indeed turn up as a large size_t,
so it will have out-of-bounds bug and be detected by KASAN.

[walter-zh.wu@mediatek.com: fix -Wstringop-overflow warning]
  Link: http://lkml.kernel.org/r/20200311134244.13016-1-walter-zh.wu@mediatek.com
Signed-off-by: Walter Wu <walter-zh.wu@mediatek.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Reviewed-by: Dmitry Vyukov <dvyukov@google.com>
Reviewed-by: Andrey Ryabinin <aryabinin@virtuozzo.com>
Cc: Alexander Potapenko <glider@google.com>
Cc: kernel test robot <lkp@intel.com>
Link: http://lkml.kernel.org/r/20191112065313.7060-1-walter-zh.wu@mediatek.com
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Walter Wu 2020-04-01 21:09:40 -07:00 committed by Linus Torvalds
parent 8cceeff48f
commit 98f3b56fa6
1 changed files with 19 additions and 0 deletions
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19
lib/test_kasan.c
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@ -285,6 +285,24 @@ static noinline void __init kmalloc_oob_in_memset(void)
kfree(ptr);
}
static noinline void __init kmalloc_memmove_invalid_size(void)
{
char *ptr;
size_t size = 64;
volatile size_t invalid_size = -2;
pr_info("invalid size in memmove\n");
ptr = kmalloc(size, GFP_KERNEL);
if (!ptr) {
pr_err("Allocation failed\n");
return;
}
memset((char *)ptr, 0, 64);
memmove((char *)ptr, (char *)ptr + 4, invalid_size);
kfree(ptr);
}
static noinline void __init kmalloc_uaf(void)
{
char *ptr;
@ -799,6 +817,7 @@ static int __init kmalloc_tests_init(void)
kmalloc_oob_memset_4();
kmalloc_oob_memset_8();
kmalloc_oob_memset_16();
kmalloc_memmove_invalid_size();
kmalloc_uaf();
kmalloc_uaf_memset();
kmalloc_uaf2();