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Subject[PATCH 2/2] selftests/timens: add a test for vfork+exit
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From: Andrei Vagin <avagin@gmail.com>

* check that a child process is in parent's time namespace after vfork.
* check that a child process is in the target namespace after exec.

Output on success:
1..5
ok 1 parent before vfork
ok 2 child before exec
ok 3 child after exec
ok 4 wait for child
ok 5 parent after vfork
# Totals: pass:5 fail:0 xfail:0 xpass:0 skip:0 error:0

Signed-off-by: Andrei Vagin <avagin@gmail.com>
---
tools/testing/selftests/timens/.gitignore | 1 +
tools/testing/selftests/timens/Makefile | 2 +-
tools/testing/selftests/timens/vfork_exec.c | 132 ++++++++++++++++++++
3 files changed, 134 insertions(+), 1 deletion(-)
create mode 100644 tools/testing/selftests/timens/vfork_exec.c

diff --git a/tools/testing/selftests/timens/.gitignore b/tools/testing/selftests/timens/.gitignore
index fe1eb8271b35..cae8dca0fbff 100644
--- a/tools/testing/selftests/timens/.gitignore
+++ b/tools/testing/selftests/timens/.gitignore
@@ -8,3 +8,4 @@ procfs
timens
timer
timerfd
+vfork_exec
diff --git a/tools/testing/selftests/timens/Makefile b/tools/testing/selftests/timens/Makefile
index 3a5936cc10ab..f0d51d4d2c87 100644
--- a/tools/testing/selftests/timens/Makefile
+++ b/tools/testing/selftests/timens/Makefile
@@ -1,4 +1,4 @@
-TEST_GEN_PROGS := timens timerfd timer clock_nanosleep procfs exec futex
+TEST_GEN_PROGS := timens timerfd timer clock_nanosleep procfs exec futex vfork_exec
TEST_GEN_PROGS_EXTENDED := gettime_perf

CFLAGS := -Wall -Werror -pthread
diff --git a/tools/testing/selftests/timens/vfork_exec.c b/tools/testing/selftests/timens/vfork_exec.c
new file mode 100644
index 000000000000..9fd8a64d25a9
--- /dev/null
+++ b/tools/testing/selftests/timens/vfork_exec.c
@@ -0,0 +1,132 @@
+// SPDX-License-Identifier: GPL-2.0
+#define _GNU_SOURCE
+#include <errno.h>
+#include <fcntl.h>
+#include <sched.h>
+#include <stdio.h>
+#include <stdbool.h>
+#include <sys/stat.h>
+#include <sys/syscall.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+#include <time.h>
+#include <unistd.h>
+#include <string.h>
+#include <pthread.h>
+
+#include "log.h"
+#include "timens.h"
+
+#define OFFSET (36000)
+
+static void *tcheck(void *arg)
+{
+ struct timespec *now = arg, tst;
+ int i;
+
+ for (i = 0; i < 2; i++) {
+ _gettime(CLOCK_MONOTONIC, &tst, i);
+ if (abs(tst.tv_sec - now->tv_sec) > 5) {
+ pr_fail("thread: unexpected value: %ld (%ld)\n",
+ tst.tv_sec, now->tv_sec);
+ return (void *)1UL;
+ }
+ }
+ return NULL;
+}
+
+static int check_in_thread(struct timespec *now)
+{
+ pthread_t th;
+ void *retval;
+
+ if (pthread_create(&th, NULL, tcheck, now))
+ return pr_perror("thread");
+ if (pthread_join(th, &retval))
+ return pr_perror("pthread_join");
+ return !(retval == NULL);
+}
+
+static int check(char *tst_name, struct timespec *now)
+{
+ struct timespec tst;
+ int i;
+
+ for (i = 0; i < 2; i++) {
+ _gettime(CLOCK_MONOTONIC, &tst, i);
+ if (abs(tst.tv_sec - now->tv_sec) > 5)
+ return pr_fail("%s: unexpected value: %ld (%ld)\n",
+ tst.tv_sec, now->tv_sec);
+ }
+ if (check_in_thread(now))
+ return 1;
+ ksft_test_result_pass("%s\n", tst_name);
+ return 0;
+}
+
+int main(int argc, char *argv[])
+{
+ struct timespec now;
+ int status;
+ pid_t pid;
+
+ if (argc > 1) {
+ char *endptr;
+
+ ksft_cnt.ksft_pass = 2;
+ now.tv_sec = strtoul(argv[1], &endptr, 0);
+ if (*endptr != 0)
+ return pr_perror("strtoul");
+
+ return check("child after exec", &now);
+ }
+
+ nscheck();
+
+ ksft_set_plan(5);
+
+ clock_gettime(CLOCK_MONOTONIC, &now);
+
+ if (unshare_timens())
+ return 1;
+
+ if (_settime(CLOCK_MONOTONIC, OFFSET))
+ return 1;
+
+ if (check("parent before vfork", &now))
+ return 1;
+
+ pid = vfork();
+ if (pid < 0)
+ return pr_perror("fork");
+
+ if (pid == 0) {
+ char now_str[64];
+ char *cargv[] = {"exec", now_str, NULL};
+ char *cenv[] = {NULL};
+
+ // Check that we are still in the source timens.
+ if (check("child before exec", &now))
+ return 1;
+
+ /* Check for proper vvar offsets after execve. */
+ snprintf(now_str, sizeof(now_str), "%ld", now.tv_sec + OFFSET);
+ execve("/proc/self/exe", cargv, cenv);
+ return pr_perror("execve");
+ }
+
+ if (waitpid(pid, &status, 0) != pid)
+ return pr_perror("waitpid");
+
+ if (status)
+ ksft_exit_fail();
+ ksft_inc_pass_cnt();
+ ksft_test_result_pass("wait for child\n");
+
+ // Check that we are still in the source timens.
+ if (check("parent after vfork", &now))
+ return 1;
+
+ ksft_exit_pass();
+ return 0;
+}
--
2.37.3.968.ga6b4b080e4-goog
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