the config option is selectable on x86_64. Add the necessary support to
the 64 bit code to trigger copy_from_user() warnings at compile time.
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
Acked-by: Ingo Molnar <mingo@elte.hu>
Acked-by: H. Peter Anvin <hpa@zytor.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
__must_check unsigned long
copy_in_user(void __user *to, const void __user *from, unsigned len);
__must_check unsigned long
copy_in_user(void __user *to, const void __user *from, unsigned len);
+extern void copy_from_user_overflow(void)
+#ifdef CONFIG_DEBUG_STRICT_USER_COPY_CHECKS
+ __compiletime_error("copy_from_user() buffer size is not provably correct")
+#else
+ __compiletime_warning("copy_from_user() buffer size is not provably correct")
+#endif
+;
+
static inline unsigned long __must_check copy_from_user(void *to,
const void __user *from,
unsigned long n)
static inline unsigned long __must_check copy_from_user(void *to,
const void __user *from,
unsigned long n)
might_fault();
if (likely(sz == -1 || sz >= n))
n = _copy_from_user(to, from, n);
might_fault();
if (likely(sz == -1 || sz >= n))
n = _copy_from_user(to, from, n);
- WARN(1, "Buffer overflow detected!\n");
-#endif
+ copy_from_user_overflow();
+
+void copy_from_user_overflow(void)
+{
+ WARN(1, "Buffer overflow detected!\n");
+}
+EXPORT_SYMBOL(copy_from_user_overflow);