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-rw-r--r--include/linux/fortify-string.h16
1 files changed, 16 insertions, 0 deletions
diff --git a/include/linux/fortify-string.h b/include/linux/fortify-string.h
index 295637a66c46..3b401fa0f374 100644
--- a/include/linux/fortify-string.h
+++ b/include/linux/fortify-string.h
@@ -52,6 +52,22 @@ extern char *__underlying_strncpy(char *p, const char *q, __kernel_size_t size)
#define __underlying_strncpy __builtin_strncpy
#endif
+/**
+ * unsafe_memcpy - memcpy implementation with no FORTIFY bounds checking
+ *
+ * @dst: Destination memory address to write to
+ * @src: Source memory address to read from
+ * @bytes: How many bytes to write to @dst from @src
+ * @justification: Free-form text or comment describing why the use is needed
+ *
+ * This should be used for corner cases where the compiler cannot do the
+ * right thing, or during transitions between APIs, etc. It should be used
+ * very rarely, and includes a place for justification detailing where bounds
+ * checking has happened, and why existing solutions cannot be employed.
+ */
+#define unsafe_memcpy(dst, src, bytes, justification) \
+ __underlying_memcpy(dst, src, bytes)
+
/*
* Clang's use of __builtin_object_size() within inlines needs hinting via
* __pass_object_size(). The preference is to only ever use type 1 (member