[PATCH v7 05/43] asm-generic: instrument usercopy in cacheflush.h

[Alexander Potapenko]

Notify memory tools about usercopy events in copy_to_user_page() and
copy_from_user_page().

Signed-off-by: Alexander Potapenko <glider@xxxxxxxxxx>
Reviewed-by: Marco Elver <elver@xxxxxxxxxx>

---
v5:
 -- cast user pointers to `void __user *`

Link: https://linux-review.googlesource.com/id/Ic1ee8da1886325f46ad67f52176f48c2c836c48f
---
 include/asm-generic/cacheflush.h | 14 ++++++++++++--
 1 file changed, 12 insertions(+), 2 deletions(-)

diff --git a/include/asm-generic/cacheflush.h b/include/asm-generic/cacheflush.h
index 4f07afacbc239..f46258d1a080f 100644
--- a/include/asm-generic/cacheflush.h
+++ b/include/asm-generic/cacheflush.h
@@ -2,6 +2,8 @@
 #ifndef _ASM_GENERIC_CACHEFLUSH_H
 #define _ASM_GENERIC_CACHEFLUSH_H
 
+#include <linux/instrumented.h>
+
 struct mm_struct;
 struct vm_area_struct;
 struct page;
@@ -105,14 +107,22 @@ static inline void flush_cache_vunmap(unsigned long start, unsigned long end)
 #ifndef copy_to_user_page
 #define copy_to_user_page(vma, page, vaddr, dst, src, len)	\
 	do { \
+		instrument_copy_to_user((void __user *)dst, src, len); \
 		memcpy(dst, src, len); \
 		flush_icache_user_page(vma, page, vaddr, len); \
 	} while (0)
 #endif
 
+
 #ifndef copy_from_user_page
-#define copy_from_user_page(vma, page, vaddr, dst, src, len) \
-	memcpy(dst, src, len)
+#define copy_from_user_page(vma, page, vaddr, dst, src, len)		  \
+	do {								  \
+		instrument_copy_from_user_before(dst, (void __user *)src, \
+						 len);			  \
+		memcpy(dst, src, len);					  \
+		instrument_copy_from_user_after(dst, (void __user *)src, len, \
+						0);			  \
+	} while (0)
 #endif
 
 #endif /* _ASM_GENERIC_CACHEFLUSH_H */
-- 
2.37.2.789.g6183377224-goog