Andrey Ryabinin <a.ryabinin <at> samsung.com> writes:

+#if defined(CONFIG_KASAN) && !defined(__SANITIZE_ADDRESS__)
+
+/*
+ * For files that not instrumented (e.g. mm/slub.c) we
+ * should use not instrumented version of mem* functions.
+ */
+
+#define memcpy(dst, src, len) __memcpy(dst, src, len)
+#define memmove(dst, src, len) __memmove(dst, src, len)
+#define memset(s, c, n) __memset(s, c, n)
+#endif

In arch/arm64/kernel/arm64ksyms.c, the memcpy, memmove, and memset functions
are exported via EXPORT_SYMBOL().
In this patch you add __memcpy etc, which will be used directly by modules
if the above #if condition is met.
I believe that EXPORT_SYMBOL() is necessary for __memcpy etc as well.

One test for this would be compiling test_kasan.c as a module with
KASAN_SANITIZE_test_kasan.o := n
CONFIG_KASAN = y

Patrick Daly

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