mtd: nand: complain loudly when chip->bits_per_cell is not correctly initialized

[karo-tx-linux.git] / include / linux / thread_info.h

diff --git a/include/linux/thread_info.h b/include/linux/thread_info.h
index d7d3ea637dd0a500875cbe64c00eb5e0188acd41..250a27614328471e4a805884a952881116a14c3e 100644 (file)
--- a/include/linux/thread_info.h
+++ b/include/linux/thread_info.h
@@ -113,6 +113,33 @@ static inline void check_object_size(const void *ptr, unsigned long n,
 { }
 #endif /* CONFIG_HARDENED_USERCOPY */
 
+extern void __compiletime_error("copy source size is too small")
+__bad_copy_from(void);
+extern void __compiletime_error("copy destination size is too small")
+__bad_copy_to(void);
+
+static inline void copy_overflow(int size, unsigned long count)
+{
+       WARN(1, "Buffer overflow detected (%d < %lu)!\n", size, count);
+}
+
+static __always_inline bool
+check_copy_size(const void *addr, size_t bytes, bool is_source)
+{
+       int sz = __compiletime_object_size(addr);
+       if (unlikely(sz >= 0 && sz < bytes)) {
+               if (!__builtin_constant_p(bytes))
+                       copy_overflow(sz, bytes);
+               else if (is_source)
+                       __bad_copy_from();
+               else
+                       __bad_copy_to();
+               return false;
+       }
+       check_object_size(addr, bytes, is_source);
+       return true;
+}
+
 #ifndef arch_setup_new_exec
 static inline void arch_setup_new_exec(void) { }
 #endif