These changes are the raw update to linux-4.4.6-rt14. Kernel sources

[kvmfornfv.git] / kernel / arch / sparc / include / asm / uaccess_64.h

diff --git a/kernel/arch/sparc/include/asm/uaccess_64.h b/kernel/arch/sparc/include/asm/uaccess_64.h
index a35194b..ea6e9a2 100644 (file)
--- a/kernel/arch/sparc/include/asm/uaccess_64.h
+++ b/kernel/arch/sparc/include/asm/uaccess_64.h
@@ -49,6 +49,28 @@ do {                                                                         \
        __asm__ __volatile__ ("wr %%g0, %0, %%asi" : : "r" ((val).seg));        \
 } while(0)
 
+/*
+ * Test whether a block of memory is a valid user space address.
+ * Returns 0 if the range is valid, nonzero otherwise.
+ */
+static inline bool __chk_range_not_ok(unsigned long addr, unsigned long size, unsigned long limit)
+{
+       if (__builtin_constant_p(size))
+               return addr > limit - size;
+
+       addr += size;
+       if (addr < size)
+               return true;
+
+       return addr > limit;
+}
+
+#define __range_not_ok(addr, size, limit)                               \
+({                                                                      \
+       __chk_user_ptr(addr);                                           \
+       __chk_range_not_ok((unsigned long __force)(addr), size, limit); \
+})
+
 static inline int __access_ok(const void __user * addr, unsigned long size)
 {
        return 1;