net: rtnetlink: validate IFLA_MTU attribute in rtnl_create_link()

[mirror_ubuntu-bionic-kernel.git] / include / linux / kernel.h

diff --git a/include/linux/kernel.h b/include/linux/kernel.h
index ce51455e2adf631229d21b43e6afb76b2496790c..9a3b318ec02b7d50133b73822161a233e061d8ff 100644 (file)
--- a/include/linux/kernel.h
+++ b/include/linux/kernel.h
@@ -72,8 +72,8 @@
 
 #define u64_to_user_ptr(x) (           \
 {                                      \
-       typecheck(u64, x);              \
-       (void __user *)(uintptr_t)x;    \
+       typecheck(u64, (x));            \
+       (void __user *)(uintptr_t)(x);  \
 }                                      \
 )
 
@@ -101,7 +101,8 @@
 #define DIV_ROUND_DOWN_ULL(ll, d) \
        ({ unsigned long long _tmp = (ll); do_div(_tmp, d); _tmp; })
 
-#define DIV_ROUND_UP_ULL(ll, d)                DIV_ROUND_DOWN_ULL((ll) + (d) - 1, (d))
+#define DIV_ROUND_UP_ULL(ll, d) \
+       DIV_ROUND_DOWN_ULL((unsigned long long)(ll) + (d) - 1, (d))
 
 #if BITS_PER_LONG == 32
 # define DIV_ROUND_UP_SECTOR_T(ll,d) DIV_ROUND_UP_ULL(ll, d)
@@ -306,6 +307,23 @@ static inline void refcount_error_report(struct pt_regs *regs, const char *err)
 { }
 #endif
 
+#ifdef CONFIG_LOCK_DOWN_KERNEL
+extern bool __kernel_is_locked_down(const char *what, bool first);
+#else
+static inline bool __kernel_is_locked_down(const char *what, bool first)
+{
+       return false;
+}
+#endif
+
+#define kernel_is_locked_down(what)                                    \
+       ({                                                              \
+               static bool message_given;                              \
+               bool locked_down = __kernel_is_locked_down(what, !message_given); \
+               message_given = true;                                   \
+               locked_down;                                            \
+       })
+
 /* Internal, do not use. */
 int __must_check _kstrtoul(const char *s, unsigned int base, unsigned long *res);
 int __must_check _kstrtol(const char *s, unsigned int base, long *res);