The patch titled
Subject: kasan: add functions for unpoisoning stack variables
has been removed from the -mm tree. Its filename was
kasan-added-functions-for-unpoisoning-stack-variables.patch
This patch was dropped because it was merged into mainline or a subsystem tree
------------------------------------------------------
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.
[arnd@xxxxxxxx: add declarations for internal functions]
Link: http://lkml.kernel.org/r/20180105094112.2690475-1-arnd@xxxxxxxx
[fengguang.wu@xxxxxxxxx: __asan_set_shadow_00 can be static]
Link: http://lkml.kernel.org/r/20171223125943.GA74341@lkp-ib03
[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>
Signed-off-by: Fengguang Wu <fengguang.wu@xxxxxxxxx>
Signed-off-by: Arnd Bergmann <arnd@xxxxxxxx>
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 +++++++++++++++
mm/kasan/kasan.h | 44 ++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 59 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)
diff -puN mm/kasan/kasan.h~kasan-added-functions-for-unpoisoning-stack-variables mm/kasan/kasan.h
--- a/mm/kasan/kasan.h~kasan-added-functions-for-unpoisoning-stack-variables
+++ a/mm/kasan/kasan.h
@@ -121,4 +121,48 @@ static inline void quarantine_reduce(voi
static inline void quarantine_remove_cache(struct kmem_cache *cache) { }
#endif
+/*
+ * Exported functions for interfaces called from assembly or from generated
+ * code. Declarations here to avoid warning about missing declarations.
+ */
+asmlinkage void kasan_unpoison_task_stack_below(const void *watermark);
+void __asan_register_globals(struct kasan_global *globals, size_t size);
+void __asan_unregister_globals(struct kasan_global *globals, size_t size);
+void __asan_loadN(unsigned long addr, size_t size);
+void __asan_storeN(unsigned long addr, size_t size);
+void __asan_handle_no_return(void);
+void __asan_poison_stack_memory(const void *addr, size_t size);
+void __asan_unpoison_stack_memory(const void *addr, size_t size);
+void __asan_alloca_poison(unsigned long addr, size_t size);
+void __asan_allocas_unpoison(const void *stack_top, const void *stack_bottom);
+
+void __asan_load1(unsigned long addr);
+void __asan_store1(unsigned long addr);
+void __asan_load2(unsigned long addr);
+void __asan_store2(unsigned long addr);
+void __asan_load4(unsigned long addr);
+void __asan_store4(unsigned long addr);
+void __asan_load8(unsigned long addr);
+void __asan_store8(unsigned long addr);
+void __asan_load16(unsigned long addr);
+void __asan_store16(unsigned long addr);
+
+void __asan_load1_noabort(unsigned long addr);
+void __asan_store1_noabort(unsigned long addr);
+void __asan_load2_noabort(unsigned long addr);
+void __asan_store2_noabort(unsigned long addr);
+void __asan_load4_noabort(unsigned long addr);
+void __asan_store4_noabort(unsigned long addr);
+void __asan_load8_noabort(unsigned long addr);
+void __asan_store8_noabort(unsigned long addr);
+void __asan_load16_noabort(unsigned long addr);
+void __asan_store16_noabort(unsigned long addr);
+
+void __asan_set_shadow_00(const void *addr, size_t size);
+void __asan_set_shadow_f1(const void *addr, size_t size);
+void __asan_set_shadow_f2(const void *addr, size_t size);
+void __asan_set_shadow_f3(const void *addr, size_t size);
+void __asan_set_shadow_f5(const void *addr, size_t size);
+void __asan_set_shadow_f8(const void *addr, size_t size);
+
#endif
_
Patches currently in -mm which might be from glider@xxxxxxxxxx are
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