Merge tag 'sched-core-2023-02-20' of git://git.kernel.org/pub/scm/linux/kernel/git...

[linux-2.6-microblaze.git] / mm / kasan / shadow.c

diff --git a/mm/kasan/shadow.c b/mm/kasan/shadow.c
index 15cfb34..3703983 100644 (file)
--- a/mm/kasan/shadow.c
+++ b/mm/kasan/shadow.c
@@ -38,6 +38,12 @@ bool __kasan_check_write(const volatile void *p, unsigned int size)
 }
 EXPORT_SYMBOL(__kasan_check_write);
 
+#ifndef CONFIG_GENERIC_ENTRY
+/*
+ * CONFIG_GENERIC_ENTRY relies on compiler emitted mem*() calls to not be
+ * instrumented. KASAN enabled toolchains should emit __asan_mem*() functions
+ * for the sites they want to instrument.
+ */
 #undef memset
 void *memset(void *addr, int c, size_t len)
 {
@@ -68,6 +74,38 @@ void *memcpy(void *dest, const void *src, size_t len)
 
        return __memcpy(dest, src, len);
 }
+#endif
+
+void *__asan_memset(void *addr, int c, size_t len)
+{
+       if (!kasan_check_range((unsigned long)addr, len, true, _RET_IP_))
+               return NULL;
+
+       return __memset(addr, c, len);
+}
+EXPORT_SYMBOL(__asan_memset);
+
+#ifdef __HAVE_ARCH_MEMMOVE
+void *__asan_memmove(void *dest, const void *src, size_t len)
+{
+       if (!kasan_check_range((unsigned long)src, len, false, _RET_IP_) ||
+           !kasan_check_range((unsigned long)dest, len, true, _RET_IP_))
+               return NULL;
+
+       return __memmove(dest, src, len);
+}
+EXPORT_SYMBOL(__asan_memmove);
+#endif
+
+void *__asan_memcpy(void *dest, const void *src, size_t len)
+{
+       if (!kasan_check_range((unsigned long)src, len, false, _RET_IP_) ||
+           !kasan_check_range((unsigned long)dest, len, true, _RET_IP_))
+               return NULL;
+
+       return __memcpy(dest, src, len);
+}
+EXPORT_SYMBOL(__asan_memcpy);
 
 void kasan_poison(const void *addr, size_t size, u8 value, bool init)
 {