linux-kernel - [PATCH 14/15] selftests/clone3: Avoid OS-defined clone

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Message-Id: <20200912110820.597135-15-keescook@chromium.org>
Date:   Sat, 12 Sep 2020 04:08:19 -0700
From:   Kees Cook <keescook@...omium.org>
To:     linux-kernel@...r.kernel.org
Cc:     Kees Cook <keescook@...omium.org>,
        Thadeu Lima de Souza Cascardo <cascardo@...onical.com>,
        Max Filippov <jcmvbkbc@...il.com>,
        Michael Ellerman <mpe@...erman.id.au>,
        Christian Brauner <christian@...uner.io>,
        Andy Lutomirski <luto@...capital.net>,
        Will Drewry <wad@...omium.org>,
        linux-kselftest@...r.kernel.org, linux-mips@...r.kernel.org,
        linux-xtensa@...ux-xtensa.org,
        linux-arm-kernel@...ts.infradead.org, linuxppc-dev@...ts.ozlabs.org
Subject: [PATCH 14/15] selftests/clone3: Avoid OS-defined clone_args

As the UAPI headers start to appear in distros, we need to avoid
outdated versions of struct clone_args to be able to test modern
features. Additionally pull in the syscall numbers correctly.

Signed-off-by: Kees Cook <keescook@...omium.org>
---
I needed to fix this to get MIPS to build the seccomp selftests.
---
 .../testing/selftests/clone3/clone3_selftests.h  | 16 ++++++++++++++--
 1 file changed, 14 insertions(+), 2 deletions(-)

diff --git a/tools/testing/selftests/clone3/clone3_selftests.h b/tools/testing/selftests/clone3/clone3_selftests.h
index 91c1a78ddb39..bc0f34e37ae1 100644
--- a/tools/testing/selftests/clone3/clone3_selftests.h
+++ b/tools/testing/selftests/clone3/clone3_selftests.h
@@ -4,11 +4,19 @@
 #define _CLONE3_SELFTESTS_H
 
 #define _GNU_SOURCE
+
+/* Pull in syscall numbers. */
+#include <unistd.h>
+#include <sys/syscall.h>
+
+/* Avoid old OS versions of "struct clone_args". */
+#define clone_args old_clone_args
 #include <sched.h>
 #include <linux/sched.h>
+#undef clone_args
+
 #include <linux/types.h>
 #include <stdint.h>
-#include <syscall.h>
 #include <sys/wait.h>
 
 #include "../kselftest.h"
@@ -25,6 +33,7 @@
 
 #ifndef __NR_clone3
 #define __NR_clone3 -1
+#endif
 struct clone_args {
 	__aligned_u64 flags;
 	__aligned_u64 pidfd;
@@ -34,13 +43,16 @@ struct clone_args {
 	__aligned_u64 stack;
 	__aligned_u64 stack_size;
 	__aligned_u64 tls;
+#ifndef CLONE_ARGS_SIZE_VER1
 #define CLONE_ARGS_SIZE_VER1 80
+#endif
 	__aligned_u64 set_tid;
 	__aligned_u64 set_tid_size;
+#ifndef CLONE_ARGS_SIZE_VER2
 #define CLONE_ARGS_SIZE_VER2 88
+#endif
 	__aligned_u64 cgroup;
 };
-#endif /* __NR_clone3 */
 
 static pid_t sys_clone3(struct clone_args *args, size_t size)
 {
-- 
2.25.1