From: Ralf Baechle <ralf@linux-mips.org>
Date: Wed, 9 Feb 2005 12:59:39 +0000 (+0000)
Subject: Fix ptrace aliasing issue in copy_from_user_page / copy_to_user_page.
X-Git-Tag: v2.6.15-rc1~731^2~1^2~306
X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=26852d5cdb2bac01f2a48b815194a045e8a8e300;p=linux-2.6

Fix ptrace aliasing issue in copy_from_user_page / copy_to_user_page.

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
---

diff --git a/include/asm-mips/cacheflush.h b/include/asm-mips/cacheflush.h
index 635f1bfb40..3780c9f935 100644
--- a/include/asm-mips/cacheflush.h
+++ b/include/asm-mips/cacheflush.h
@@ -55,11 +55,17 @@ extern void (*flush_icache_range)(unsigned long start, unsigned long end);
 
 #define copy_to_user_page(vma, page, vaddr, dst, src, len)		\
 do {									\
+	if (cpu_has_dc_aliases)						\
+		flush_cache_page(vma, vaddr);				\
 	memcpy(dst, (void *) src, len);					\
 	flush_icache_page(vma, page);					\
 } while (0)
 #define copy_from_user_page(vma, page, vaddr, dst, src, len)		\
-	memcpy(dst, src, len)
+do {									\
+	if (cpu_has_dc_aliases)						\
+		flush_cache_page(vma, vaddr);				\
+	memcpy(dst, src, len);						\
+} while (0)
 
 extern void (*flush_cache_sigtramp)(unsigned long addr);
 extern void (*flush_icache_all)(void);