The patch titled
Subject: kasan: add functions for unpoisoning stack variables
has been added to the -mm tree. Its filename is
kasan-added-functions-for-unpoisoning-stack-variables.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/kasan-added-functions-for-unpoisoning-stack-variables.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/kasan-added-functions-for-unpoisoning-stack-variables.patch
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------------------------------------------------------
From: Alexander Potapenko <glider@xxxxxxxxxx>
Subject: kasan: add functions for unpoisoning stack variables
As a code-size optimization, LLVM builds since r279383 may bulk-manipulate
the shadow region when (un)poisoning large memory blocks. This requires
new callbacks that simply do an uninstrumented memset().
This fixes linking the Clang-built kernel when using KASAN.
[ghackmann@xxxxxxxxxx: fix memset() parameters, and tweak commit message to describe new callbacks]
Link: http://lkml.kernel.org/r/20171204191735.132544-6-paullawrence@xxxxxxxxxx
Signed-off-by: Alexander Potapenko <glider@xxxxxxxxxx>
Signed-off-by: Greg Hackmann <ghackmann@xxxxxxxxxx>
Signed-off-by: Paul Lawrence <paullawrence@xxxxxxxxxx>
Acked-by: Andrey Ryabinin <aryabinin@xxxxxxxxxxxxx>
Cc: Dmitry Vyukov <dvyukov@xxxxxxxxxx>
Cc: Masahiro Yamada <yamada.masahiro@xxxxxxxxxxxxx>
Cc: Matthias Kaehlcke <mka@xxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/kasan/kasan.c | 15 +++++++++++++++
1 file changed, 15 insertions(+)
diff -puN mm/kasan/kasan.c~kasan-added-functions-for-unpoisoning-stack-variables mm/kasan/kasan.c
--- a/mm/kasan/kasan.c~kasan-added-functions-for-unpoisoning-stack-variables
+++ a/mm/kasan/kasan.c
@@ -770,6 +770,21 @@ void __asan_allocas_unpoison(const void
}
EXPORT_SYMBOL(__asan_allocas_unpoison);
+/* Emitted by the compiler to [un]poison local variables. */
+#define DEFINE_ASAN_SET_SHADOW(byte) \
+ void __asan_set_shadow_##byte(const void *addr, size_t size) \
+ { \
+ __memset((void *)addr, 0x##byte, size); \
+ } \
+ EXPORT_SYMBOL(__asan_set_shadow_##byte)
+
+DEFINE_ASAN_SET_SHADOW(00);
+DEFINE_ASAN_SET_SHADOW(f1);
+DEFINE_ASAN_SET_SHADOW(f2);
+DEFINE_ASAN_SET_SHADOW(f3);
+DEFINE_ASAN_SET_SHADOW(f5);
+DEFINE_ASAN_SET_SHADOW(f8);
+
#ifdef CONFIG_MEMORY_HOTPLUG
static int __meminit kasan_mem_notifier(struct notifier_block *nb,
unsigned long action, void *data)
_
Patches currently in -mm which might be from glider@xxxxxxxxxx are
kasan-added-functions-for-unpoisoning-stack-variables.patch
lib-stackdepot-use-a-non-instrumented-version-of-memcmp.patch
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