Merge tag 'usercopy-v4.8-rc6-part2' of git://git.kernel.org/pub/scm/linux/kernel...

[cascardo/linux.git] / include / linux / thread_info.h

diff --git a/include/linux/thread_info.h b/include/linux/thread_info.h
index 352b154..2b5b10e 100644 (file)
--- a/include/linux/thread_info.h
+++ b/include/linux/thread_info.h
@@ -105,6 +105,31 @@ static inline int test_ti_thread_flag(struct thread_info *ti, int flag)
 
 #define tif_need_resched() test_thread_flag(TIF_NEED_RESCHED)
 
+#ifndef CONFIG_HAVE_ARCH_WITHIN_STACK_FRAMES
+static inline int arch_within_stack_frames(const void * const stack,
+                                          const void * const stackend,
+                                          const void *obj, unsigned long len)
+{
+       return 0;
+}
+#endif
+
+#ifdef CONFIG_HARDENED_USERCOPY
+extern void __check_object_size(const void *ptr, unsigned long n,
+                                       bool to_user);
+
+static __always_inline void check_object_size(const void *ptr, unsigned long n,
+                                             bool to_user)
+{
+       if (!__builtin_constant_p(n))
+               __check_object_size(ptr, n, to_user);
+}
+#else
+static inline void check_object_size(const void *ptr, unsigned long n,
+                                    bool to_user)
+{ }
+#endif /* CONFIG_HARDENED_USERCOPY */
+
 #endif /* __KERNEL__ */
 
 #endif /* _LINUX_THREAD_INFO_H */