The patch titled
Subject: mm/kasan: add API to check memory regions
has been added to the -mm tree. Its filename is
mm-kasan-add-api-to-check-memory-regions.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-kasan-add-api-to-check-memory-regions.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-kasan-add-api-to-check-memory-regions.patch
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*** Remember to use Documentation/SubmitChecklist when testing your code ***
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------------------------------------------------------
From: Andrey Ryabinin <aryabinin@xxxxxxxxxxxxx>
Subject: mm/kasan: add API to check memory regions
Memory access coded in an assembly won't be seen by KASAN as a compiler
can instrument only C code. Add kasan_check_[read,write]() API which is
going to be used to check a certain memory range.
Link: http://lkml.kernel.org/r/1462538722-1574-3-git-send-email-aryabinin@xxxxxxxxxxxxx
Signed-off-by: Andrey Ryabinin <aryabinin@xxxxxxxxxxxxx>
Cc: Alexander Potapenko <glider@xxxxxxxxxx>
Cc: Dmitry Vyukov <dvyukov@xxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxx>
Cc: "H. Peter Anvin" <hpa@xxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
MAINTAINERS | 2 +-
include/linux/kasan-checks.h | 12 ++++++++++++
mm/kasan/kasan.c | 12 ++++++++++++
3 files changed, 25 insertions(+), 1 deletion(-)
diff -puN MAINTAINERS~mm-kasan-add-api-to-check-memory-regions MAINTAINERS
--- a/MAINTAINERS~mm-kasan-add-api-to-check-memory-regions
+++ a/MAINTAINERS
@@ -6175,7 +6175,7 @@ S: Maintained
F: arch/*/include/asm/kasan.h
F: arch/*/mm/kasan_init*
F: Documentation/kasan.txt
-F: include/linux/kasan.h
+F: include/linux/kasan*.h
F: lib/test_kasan.c
F: mm/kasan/
F: scripts/Makefile.kasan
diff -puN /dev/null include/linux/kasan-checks.h
--- /dev/null
+++ a/include/linux/kasan-checks.h
@@ -0,0 +1,12 @@
+#ifndef _LINUX_KASAN_CHECKS_H
+#define _LINUX_KASAN_CHECKS_H
+
+#ifdef CONFIG_KASAN
+void kasan_check_read(const void *p, unsigned int size);
+void kasan_check_write(const void *p, unsigned int size);
+#else
+static inline void kasan_check_read(const void *p, unsigned int size) { }
+static inline void kasan_check_write(const void *p, unsigned int size) { }
+#endif
+
+#endif
diff -puN mm/kasan/kasan.c~mm-kasan-add-api-to-check-memory-regions mm/kasan/kasan.c
--- a/mm/kasan/kasan.c~mm-kasan-add-api-to-check-memory-regions
+++ a/mm/kasan/kasan.c
@@ -299,6 +299,18 @@ static void check_memory_region(unsigned
check_memory_region_inline(addr, size, write, ret_ip);
}
+void kasan_check_read(const void *p, unsigned int size)
+{
+ check_memory_region((unsigned long)p, size, false, _RET_IP_);
+}
+EXPORT_SYMBOL(kasan_check_read);
+
+void kasan_check_write(const void *p, unsigned int size)
+{
+ check_memory_region((unsigned long)p, size, true, _RET_IP_);
+}
+EXPORT_SYMBOL(kasan_check_write);
+
#undef memset
void *memset(void *addr, int c, size_t len)
{
_
Patches currently in -mm which might be from aryabinin@xxxxxxxxxxxxx are
mm-kasan-print-name-of-mem-caller-in-report.patch
mm-kasan-add-api-to-check-memory-regions.patch
x86-kasan-instrument-user-memory-access-api.patch
kasan-tests-add-tests-for-user-memory-access-functions.patch
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