x32: fix waitid()

It needs 64bit rusage and 32bit siginfo. glibc never calls it with non-NULL rusage pointer, or we would've seen breakage already... Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
DX37 · Dec 26, 2012 · a566c28 · a566c28
1 parent 8d9807b
commit a566c28
Showing 1 changed file with 5 additions and 1 deletion.
diff --git a/kernel/compat.c b/kernel/compat.c
@@ -587,7 +587,11 @@ COMPAT_SYSCALL_DEFINE5(waitid,
 		return ret;
 
 	if (uru) {
-		ret = put_compat_rusage(&ru, uru);
+		/* sys_waitid() overwrites everything in ru */
+		if (COMPAT_USE_64BIT_TIME)
+			ret = copy_to_user(uru, &ru, sizeof(ru));
+		else
+			ret = put_compat_rusage(&ru, uru);
 		if (ret)
 			return ret;
 	}