X-Git-Url: http://pilppa.org/gitweb/gitweb.cgi?a=blobdiff_plain;f=arch%2Fum%2Finclude%2Fum_uaccess.h;h=5126a99b59612a4dd3ac9b6818aed574e67fa438;hb=d27ecef7c63064c1f2eadf413e694e65a34f1f79;hp=84c0868cd5613610c4f874aa280283d2d5f0a35b;hpb=142e27fc8a3619471669d6241784eec9167c47d1;p=linux-2.6-omap-h63xx.git

diff --git a/arch/um/include/um_uaccess.h b/arch/um/include/um_uaccess.h
index 84c0868cd56..5126a99b596 100644
--- a/arch/um/include/um_uaccess.h
+++ b/arch/um/include/um_uaccess.h
@@ -6,7 +6,6 @@
 #ifndef __ARCH_UM_UACCESS_H
 #define __ARCH_UM_UACCESS_H
 
-#include "linux/config.h"
 #include "choose-mode.h"
 
 #ifdef CONFIG_MODE_TT
@@ -17,8 +16,27 @@
 #include "uaccess-skas.h"
 #endif
 
+#include "asm/fixmap.h"
+
+#define __under_task_size(addr, size) \
+	(((unsigned long) (addr) < TASK_SIZE) && \
+         (((unsigned long) (addr) + (size)) < TASK_SIZE))
+
+#define __access_ok_vsyscall(type, addr, size) \
+	 ((type == VERIFY_READ) && \
+	  ((unsigned long) (addr) >= FIXADDR_USER_START) && \
+	  ((unsigned long) (addr) + (size) <= FIXADDR_USER_END) && \
+	  ((unsigned long) (addr) + (size) >= (unsigned long)(addr)))
+
+#define __addr_range_nowrap(addr, size) \
+	((unsigned long) (addr) <= ((unsigned long) (addr) + (size)))
+
 #define access_ok(type, addr, size) \
-	CHOOSE_MODE_PROC(access_ok_tt, access_ok_skas, type, addr, size)
+	(__addr_range_nowrap(addr, size) && \
+	 (__under_task_size(addr, size) || \
+	  __access_ok_vsyscall(type, addr, size) || \
+	  segment_eq(get_fs(), KERNEL_DS) || \
+	  CHOOSE_MODE_PROC(access_ok_tt, access_ok_skas, type, addr, size)))
 
 static inline int copy_from_user(void *to, const void __user *from, int n)
 {