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outdated versions of struct clone_args to be able to test modern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, named "struct __clone_args". Additionally update the struct
size macro names to match UAPI names.

Acked-by: Christian Brauner <[e-mail]>
Link: https://lore.kernel.org/lkml/20200921075432.u4gis3s2o5qrsb5g@wittgenstein/
Signed-off-by: Kees Cook <[e-mail]>

tools/testing/selftests/clone3/clone3.c

···
 #include "../kselftest.h"
 #include "clone3_selftests.h"
 
-/*
- * Different sizes of struct clone_args
- */
-#ifndef CLONE3_ARGS_SIZE_V0
-#define CLONE3_ARGS_SIZE_V0 64
-#endif
-
 enum test_mode {
 	CLONE3_ARGS_NO_TEST,
 	CLONE3_ARGS_ALL_0,
···
 
 static int call_clone3(uint64_t flags, size_t size, enum test_mode test_mode)
 {
-	struct clone_args args = {
+	struct __clone_args args = {
 		.flags = flags,
 		.exit_signal = SIGCHLD,
 	};
 
 	struct clone_args_extended {
-		struct clone_args args;
+		struct __clone_args args;
 		__aligned_u64 excess_space[2];
 	} args_ext;
 
···
 	int status;
 
 	memset(&args_ext, 0, sizeof(args_ext));
-	if (size > sizeof(struct clone_args))
+	if (size > sizeof(struct __clone_args))
 		args_ext.excess_space[1] = 1;
 
 	if (size == 0)
-		size = sizeof(struct clone_args);
+		size = sizeof(struct __clone_args);
 
 	switch (test_mode) {
 	case CLONE3_ARGS_ALL_0:
···
 		break;
 	}
 
-	memcpy(&args_ext.args, &args, sizeof(struct clone_args));
+	memcpy(&args_ext.args, &args, sizeof(struct __clone_args));
 
-	pid = sys_clone3((struct clone_args *)&args_ext, size);
+	pid = sys_clone3((struct __clone_args *)&args_ext, size);
 	if (pid < 0) {
 		ksft_print_msg("%s - Failed to create new process\n",
 				strerror(errno));
···
 	else
 		ksft_test_result_skip("Skipping clone3() with CLONE_NEWPID\n");
 
-	/* Do a clone3() with CLONE3_ARGS_SIZE_V0. */
-	test_clone3(0, CLONE3_ARGS_SIZE_V0, 0, CLONE3_ARGS_NO_TEST);
+	/* Do a clone3() with CLONE_ARGS_SIZE_VER0. */
+	test_clone3(0, CLONE_ARGS_SIZE_VER0, 0, CLONE3_ARGS_NO_TEST);
 
-	/* Do a clone3() with CLONE3_ARGS_SIZE_V0 - 8 */
-	test_clone3(0, CLONE3_ARGS_SIZE_V0 - 8, -EINVAL, CLONE3_ARGS_NO_TEST);
+	/* Do a clone3() with CLONE_ARGS_SIZE_VER0 - 8 */
+	test_clone3(0, CLONE_ARGS_SIZE_VER0 - 8, -EINVAL, CLONE3_ARGS_NO_TEST);
 
 	/* Do a clone3() with sizeof(struct clone_args) + 8 */
-	test_clone3(0, sizeof(struct clone_args) + 8, 0, CLONE3_ARGS_NO_TEST);
+	test_clone3(0, sizeof(struct __clone_args) + 8, 0, CLONE3_ARGS_NO_TEST);
 
 	/* Do a clone3() with exit_signal having highest 32 bits non-zero */
 	test_clone3(0, 0, -EINVAL, CLONE3_ARGS_INVAL_EXIT_SIGNAL_BIG);
···
 	/* Do a clone3() with NSIG < exit_signal < CSIG */
 	test_clone3(0, 0, -EINVAL, CLONE3_ARGS_INVAL_EXIT_SIGNAL_NSIG);
 
-	test_clone3(0, sizeof(struct clone_args) + 8, 0, CLONE3_ARGS_ALL_0);
+	test_clone3(0, sizeof(struct __clone_args) + 8, 0, CLONE3_ARGS_ALL_0);
 
-	test_clone3(0, sizeof(struct clone_args) + 16, -E2BIG,
+	test_clone3(0, sizeof(struct __clone_args) + 16, -E2BIG,
 			CLONE3_ARGS_ALL_0);
 
-	test_clone3(0, sizeof(struct clone_args) * 2, -E2BIG,
+	test_clone3(0, sizeof(struct __clone_args) * 2, -E2BIG,
 			CLONE3_ARGS_ALL_0);
 
 	/* Do a clone3() with > page size */
 	test_clone3(0, getpagesize() + 8, -E2BIG, CLONE3_ARGS_NO_TEST);
 
-	/* Do a clone3() with CLONE3_ARGS_SIZE_V0 in a new PID NS. */
+	/* Do a clone3() with CLONE_ARGS_SIZE_VER0 in a new PID NS. */
 	if (uid == 0)
-		test_clone3(CLONE_NEWPID, CLONE3_ARGS_SIZE_V0, 0,
+		test_clone3(CLONE_NEWPID, CLONE_ARGS_SIZE_VER0, 0,
 				CLONE3_ARGS_NO_TEST);
 	else
 		ksft_test_result_skip("Skipping clone3() with CLONE_NEWPID\n");
 
-	/* Do a clone3() with CLONE3_ARGS_SIZE_V0 - 8 in a new PID NS */
-	test_clone3(CLONE_NEWPID, CLONE3_ARGS_SIZE_V0 - 8, -EINVAL,
+	/* Do a clone3() with CLONE_ARGS_SIZE_VER0 - 8 in a new PID NS */
+	test_clone3(CLONE_NEWPID, CLONE_ARGS_SIZE_VER0 - 8, -EINVAL,
 			CLONE3_ARGS_NO_TEST);
 
 	/* Do a clone3() with sizeof(struct clone_args) + 8 in a new PID NS */
 	if (uid == 0)
-		test_clone3(CLONE_NEWPID, sizeof(struct clone_args) + 8, 0,
+		test_clone3(CLONE_NEWPID, sizeof(struct __clone_args) + 8, 0,
 				CLONE3_ARGS_NO_TEST);
 	else
 		ksft_test_result_skip("Skipping clone3() with CLONE_NEWPID\n");

tools/testing/selftests/clone3/clone3_cap_checkpoint_restore.c

···
 	int status;
 	pid_t pid = -1;
 
-	struct clone_args args = {
+	struct __clone_args args = {
 		.exit_signal = SIGCHLD,
 		.set_tid = ptr_to_u64(set_tid),
 		.set_tid_size = set_tid_size,
 	};
 
-	pid = sys_clone3(&args, sizeof(struct clone_args));
+	pid = sys_clone3(&args, sizeof(args));
 	if (pid < 0) {
 		TH_LOG("%s - Failed to create new process", strerror(errno));
 		return -errno;

tools/testing/selftests/clone3/clone3_clear_sighand.c

···
 {
 	int ret;
 	pid_t pid;
-	struct clone_args args = {};
+	struct __clone_args args = {};
 	struct sigaction act;
 
 	/*

tools/testing/selftests/clone3/clone3_selftests.h

···
 #define CLONE_INTO_CGROUP 0x200000000ULL /* Clone into a specific cgroup given the right permissions. */
 #endif
 
-#ifndef CLONE_ARGS_SIZE_VER0
-#define CLONE_ARGS_SIZE_VER0 64
-#endif
-
 #ifndef __NR_clone3
 #define __NR_clone3 -1
-struct clone_args {
+#endif
+
+struct __clone_args {
 	__aligned_u64 flags;
 	__aligned_u64 pidfd;
 	__aligned_u64 child_tid;
···
 	__aligned_u64 stack;
 	__aligned_u64 stack_size;
 	__aligned_u64 tls;
-#define CLONE_ARGS_SIZE_VER1 80
+#ifndef CLONE_ARGS_SIZE_VER0
+#define CLONE_ARGS_SIZE_VER0 64	/* sizeof first published struct */
+#endif
 	__aligned_u64 set_tid;
 	__aligned_u64 set_tid_size;
-#define CLONE_ARGS_SIZE_VER2 88
+#ifndef CLONE_ARGS_SIZE_VER1
+#define CLONE_ARGS_SIZE_VER1 80	/* sizeof second published struct */
+#endif
 	__aligned_u64 cgroup;
+#ifndef CLONE_ARGS_SIZE_VER2
+#define CLONE_ARGS_SIZE_VER2 88	/* sizeof third published struct */
+#endif
 };
-#endif /* __NR_clone3 */
 
-static pid_t sys_clone3(struct clone_args *args, size_t size)
+static pid_t sys_clone3(struct __clone_args *args, size_t size)
 {
 	fflush(stdout);
 	fflush(stderr);
···
 static inline void test_clone3_supported(void)
 {
 	pid_t pid;
-	struct clone_args args = {};
+	struct __clone_args args = {};
 
 	if (__NR_clone3 < 0)
 		ksft_exit_skip("clone3() syscall is not supported\n");

tools/testing/selftests/clone3/clone3_set_tid.c

···
 	int status;
 	pid_t pid = -1;
 
-	struct clone_args args = {
+	struct __clone_args args = {
 		.flags = flags,
 		.exit_signal = SIGCHLD,
 		.set_tid = ptr_to_u64(set_tid),
 		.set_tid_size = set_tid_size,
 	};
 
-	pid = sys_clone3(&args, sizeof(struct clone_args));
+	pid = sys_clone3(&args, sizeof(args));
 	if (pid < 0) {
 		ksft_print_msg("%s - Failed to create new process\n",
 			       strerror(errno));

tools/testing/selftests/pidfd/pidfd_setns_test.c

···
 
 pid_t create_child(int *pidfd, unsigned flags)
 {
-	struct clone_args args = {
+	struct __clone_args args = {
 		.flags		= CLONE_PIDFD | flags,
 		.exit_signal	= SIGCHLD,
 		.pidfd		= ptr_to_u64(pidfd),

tools/testing/selftests/seccomp/seccomp_bpf.c

···
 	long ret;
 	int status;
 	struct pollfd pollfd;
-	struct clone_args args = {
+	struct __clone_args args = {
 		.flags = CLONE_FILES,
 		.exit_signal = SIGCHLD,
 	};
···
 	long ret;
 	int status;
 	struct pollfd pollfd;
-	struct clone_args args = {
+	struct __clone_args args = {
 		.flags = CLONE_FILES,
 		.exit_signal = SIGCHLD,
 	};