The patch titled
Subject: lib/test_kasan: Add test for double-kzfree detection
has been added to the -mm tree. Its filename is
lib-test_kasan-add-test-for-double-kzfree-detection.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/lib-test_kasan-add-test-for-double-kzfree-detection.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/lib-test_kasan-add-test-for-double-kzfree-detection.patch
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------------------------------------------------------
From: Marco Elver <elver@xxxxxxxxxx>
Subject: lib/test_kasan: Add test for double-kzfree detection
Adds a simple test that checks if double-kzfree is being detected
correctly.
Link: http://lkml.kernel.org/r/20190626142014.141844-4-elver@xxxxxxxxxx
Signed-off-by: Marco Elver <elver@xxxxxxxxxx>
Cc: Andrey Ryabinin <aryabinin@xxxxxxxxxxxxx>
Cc: Dmitry Vyukov <dvyukov@xxxxxxxxxx>
Cc: Alexander Potapenko <glider@xxxxxxxxxx>
Cc: Andrey Konovalov <andreyknvl@xxxxxxxxxx>
Cc: Christoph Lameter <cl@xxxxxxxxx>
Cc: Pekka Enberg <penberg@xxxxxxxxxx>
Cc: David Rientjes <rientjes@xxxxxxxxxx>
Cc: Joonsoo Kim <iamjoonsoo.kim@xxxxxxx>
Cc: Mark Rutland <mark.rutland@xxxxxxx>
Cc: Kees Cook <keescook@xxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
lib/test_kasan.c | 17 +++++++++++++++++
1 file changed, 17 insertions(+)
--- a/lib/test_kasan.c~lib-test_kasan-add-test-for-double-kzfree-detection
+++ a/lib/test_kasan.c
@@ -693,6 +693,22 @@ static noinline void __init kasan_bitops
kfree(bits);
}
+static noinline void __init kmalloc_double_kzfree(void)
+{
+ char *ptr;
+ size_t size = 16;
+
+ pr_info("double-free (kzfree)\n");
+ ptr = kmalloc(size, GFP_KERNEL);
+ if (!ptr) {
+ pr_err("Allocation failed\n");
+ return;
+ }
+
+ kzfree(ptr);
+ kzfree(ptr);
+}
+
static int __init kmalloc_tests_init(void)
{
/*
@@ -735,6 +751,7 @@ static int __init kmalloc_tests_init(voi
kasan_memcmp();
kasan_strings();
kasan_bitops();
+ kmalloc_double_kzfree();
kasan_restore_multi_shot(multishot);
_
Patches currently in -mm which might be from elver@xxxxxxxxxx are
mm-kasan-print-frame-description-for-stack-bugs.patch
lib-test_kasan-add-bitops-tests.patch
x86-use-static_cpu_has-in-uaccess-region-to-avoid-instrumentation.patch
asm-generic-x86-add-bitops-instrumentation-for-kasan.patch
mm-kasan-introduce-__kasan_check_readwrite.patch
mm-kasan-change-kasan_check_readwrite-to-return-boolean.patch
lib-test_kasan-add-test-for-double-kzfree-detection.patch
mm-slab-refactor-common-ksize-kasan-logic-into-slab_commonc.patch
mm-kasan-add-object-validation-in-ksize.patch
