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authorWalter Wu <walter-zh.wu@mediatek.com>2020-04-01 21:09:40 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2020-04-02 09:35:30 -0700
commit98f3b56fa62a61f1d4d6a5fdd035f0b03be1e93f (patch)
tree47aa9c7ce87f5260e1f238b7c0e960c70e22aed3
parent8cceeff48f23eede76de995df08cf665182ec8fb (diff)
downloadlinux-98f3b56fa62a61f1d4d6a5fdd035f0b03be1e93f.tar.bz2
kasan: add test for invalid size in memmove
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>
-rw-r--r--lib/test_kasan.c19
1 files changed, 19 insertions, 0 deletions
diff --git a/lib/test_kasan.c b/lib/test_kasan.c
index 3872d250ed2c..e3087d90e00d 100644
--- a/lib/test_kasan.c
+++ b/lib/test_kasan.c
@@ -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();