linux-kernel - [PATCH v2 4/4] tests: add CLONE

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Message-Id: <20200706154912.3248030-5-christian.brauner@ubuntu.com>
Date:   Mon,  6 Jul 2020 17:49:12 +0200
From:   Christian Brauner <christian.brauner@...ntu.com>
To:     linux-kernel@...r.kernel.org
Cc:     Andrei Vagin <avagin@...il.com>,
        linux-arm-kernel@...ts.infradead.org, x86@...nel.org,
        Will Deacon <will@...nel.org>,
        Vincenzo Frascino <vincenzo.frascino@....com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Serge Hallyn <serge@...lyn.com>,
        Michael Kerrisk <mtk.manpages@...il.com>,
        Andy Lutomirski <luto@...nel.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Mark Rutland <mark.rutland@....com>,
        Dmitry Safonov <dima@...sta.com>,
        Christian Brauner <christian.brauner@...ntu.com>
Subject: [PATCH v2 4/4] tests: add CLONE_NEWTIME setns tests

Now that pidfds support CLONE_NEWTIME as well enable testing them in the
setns() testuite.

Cc: Serge Hallyn <serge@...lyn.com>
Cc: Michael Kerrisk <mtk.manpages@...il.com>
Cc: Dmitry Safonov <dima@...sta.com>
Cc: Andrei Vagin <avagin@...il.com>
Signed-off-by: Christian Brauner <christian.brauner@...ntu.com>
---
 tools/testing/selftests/pidfd/pidfd.h         |  4 +
 .../selftests/pidfd/pidfd_setns_test.c        | 76 +++++++++++++++++++
 2 files changed, 80 insertions(+)

diff --git a/tools/testing/selftests/pidfd/pidfd.h b/tools/testing/selftests/pidfd/pidfd.h
index 8d728eda783d..a2c80914e3dc 100644
--- a/tools/testing/selftests/pidfd/pidfd.h
+++ b/tools/testing/selftests/pidfd/pidfd.h
@@ -22,6 +22,10 @@
 #define P_PIDFD 3
 #endif
 
+#ifndef CLONE_NEWTIME
+#define CLONE_NEWTIME 0x00000080
+#endif
+
 #ifndef CLONE_PIDFD
 #define CLONE_PIDFD 0x00001000
 #endif
diff --git a/tools/testing/selftests/pidfd/pidfd_setns_test.c b/tools/testing/selftests/pidfd/pidfd_setns_test.c
index 9418108eae13..7a27dbe07e23 100644
--- a/tools/testing/selftests/pidfd/pidfd_setns_test.c
+++ b/tools/testing/selftests/pidfd/pidfd_setns_test.c
@@ -32,6 +32,7 @@ enum {
 	PIDFD_NS_NET,
 	PIDFD_NS_CGROUP,
 	PIDFD_NS_PIDCLD,
+	PIDFD_NS_TIME,
 	PIDFD_NS_MAX
 };
 
@@ -47,6 +48,7 @@ const struct ns_info {
 	[PIDFD_NS_NET]    = { "net",              CLONE_NEWNET,    },
 	[PIDFD_NS_CGROUP] = { "cgroup",           CLONE_NEWCGROUP, },
 	[PIDFD_NS_PIDCLD] = { "pid_for_children", 0,               },
+	[PIDFD_NS_TIME]	  = { "time",             CLONE_NEWTIME,   },
 };
 
 FIXTURE(current_nsset)
@@ -83,9 +85,49 @@ pid_t create_child(int *pidfd, unsigned flags)
 	return sys_clone3(&args, sizeof(struct clone_args));
 }
 
+static bool switch_timens(void)
+{
+	int fd, ret;
+
+	if (unshare(CLONE_NEWTIME))
+		return false;
+
+	fd = open("/proc/self/ns/time_for_children", O_RDONLY | O_CLOEXEC);
+	if (fd < 0)
+		return false;
+
+	ret = setns(fd, CLONE_NEWTIME);
+	close(fd);
+	return ret == 0;
+}
+
+static ssize_t read_nointr(int fd, void *buf, size_t count)
+{
+	ssize_t ret;
+
+	do {
+		ret = read(fd, buf, count);
+	} while (ret < 0 && errno == EINTR);
+
+	return ret;
+}
+
+static ssize_t write_nointr(int fd, const void *buf, size_t count)
+{
+	ssize_t ret;
+
+	do {
+		ret = write(fd, buf, count);
+	} while (ret < 0 && errno == EINTR);
+
+	return ret;
+}
+
 FIXTURE_SETUP(current_nsset)
 {
 	int i, proc_fd, ret;
+	int ipc_sockets[2];
+	char c;
 
 	for (i = 0; i < PIDFD_NS_MAX; i++) {
 		self->nsfds[i]		= -EBADF;
@@ -130,6 +172,9 @@ FIXTURE_SETUP(current_nsset)
 		TH_LOG("%m - Failed to open pidfd for process %d", self->pid);
 	}
 
+	ret = socketpair(AF_LOCAL, SOCK_STREAM | SOCK_CLOEXEC, 0, ipc_sockets);
+	EXPECT_EQ(ret, 0);
+
 	/* Create tasks that will be stopped. */
 	self->child_pid1 = create_child(&self->child_pidfd1,
 					CLONE_NEWUSER | CLONE_NEWNS |
@@ -139,10 +184,27 @@ FIXTURE_SETUP(current_nsset)
 	EXPECT_GE(self->child_pid1, 0);
 
 	if (self->child_pid1 == 0) {
+		close(ipc_sockets[0]);
+
+		if (!switch_timens())
+			_exit(EXIT_FAILURE);
+
+		if (write_nointr(ipc_sockets[1], "1", 1) < 0)
+			_exit(EXIT_FAILURE);
+
+		close(ipc_sockets[1]);
+
 		pause();
 		_exit(EXIT_SUCCESS);
 	}
 
+	close(ipc_sockets[1]);
+	ASSERT_EQ(read_nointr(ipc_sockets[0], &c, 1), 1);
+	close(ipc_sockets[0]);
+
+	ret = socketpair(AF_LOCAL, SOCK_STREAM | SOCK_CLOEXEC, 0, ipc_sockets);
+	EXPECT_EQ(ret, 0);
+
 	self->child_pid2 = create_child(&self->child_pidfd2,
 					CLONE_NEWUSER | CLONE_NEWNS |
 					CLONE_NEWCGROUP | CLONE_NEWIPC |
@@ -151,10 +213,24 @@ FIXTURE_SETUP(current_nsset)
 	EXPECT_GE(self->child_pid2, 0);
 
 	if (self->child_pid2 == 0) {
+		close(ipc_sockets[0]);
+
+		if (!switch_timens())
+			_exit(EXIT_FAILURE);
+
+		if (write_nointr(ipc_sockets[1], "1", 1) < 0)
+			_exit(EXIT_FAILURE);
+
+		close(ipc_sockets[1]);
+
 		pause();
 		_exit(EXIT_SUCCESS);
 	}
 
+	close(ipc_sockets[1]);
+	ASSERT_EQ(read_nointr(ipc_sockets[0], &c, 1), 1);
+	close(ipc_sockets[0]);
+
 	for (i = 0; i < PIDFD_NS_MAX; i++) {
 		char p[100];
 
-- 
2.27.0