The patch titled
Subject: mm, kasan: add a ksize() test
has been added to the -mm tree. Its filename is
mm-kasan-add-a-ksize-test.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-kasan-add-a-ksize-test.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-kasan-add-a-ksize-test.patch
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------------------------------------------------------
From: Alexander Potapenko <glider@xxxxxxxxxx>
Subject: mm, kasan: add a ksize() test
Add a test that makes sure ksize() unpoisons the whole chunk.
Signed-off-by: Alexander Potapenko <glider@xxxxxxxxxx>
Cc: Andrey Konovalov <adech.fo@xxxxxxxxx>
Cc: Dmitry Vyukov <dvyukov@xxxxxxxxxx>
Cc: Christoph Lameter <cl@xxxxxxxxx>
Cc: Andrey Ryabinin <ryabinin.a.a@xxxxxxxxx>
Cc: Konstantin Serebryany <kcc@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
lib/test_kasan.c | 20 ++++++++++++++++++++
1 file changed, 20 insertions(+)
diff -puN lib/test_kasan.c~mm-kasan-add-a-ksize-test lib/test_kasan.c
--- a/lib/test_kasan.c~mm-kasan-add-a-ksize-test
+++ a/lib/test_kasan.c
@@ -370,6 +370,25 @@ static noinline void __init kasan_quaran
}
#endif
+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();
@@ -396,6 +415,7 @@ static int __init kmalloc_tests_init(voi
#ifdef CONFIG_SLAB
kasan_quarantine_cache();
#endif
+ ksize_unpoisons_memory();
return -EAGAIN;
}
_
Patches currently in -mm which might be from glider@xxxxxxxxxx are
lib-stackdepotc-allow-the-stack-trace-hash-to-be-zero.patch
mm-kasan-initial-memory-quarantine-implementation.patch
mm-kasan-initial-memory-quarantine-implementation-v8.patch
mm-kasan-dont-call-kasan_krealloc-from-ksize.patch
mm-kasan-add-a-ksize-test.patch
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