Revert "selftests/timens: add a test for vfork+exit"

The next patch reverts the code that this test verified.

This reverts commit 6342140db6609a0c7d34f68c52b2947468e0e630.

Signed-off-by: Andrei Vagin <[e-mail]>
Signed-off-by: Kees Cook <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]

tools/testing/selftests/timens/Makefile

···
-TEST_GEN_PROGS := timens timerfd timer clock_nanosleep procfs exec futex vfork_exec
+TEST_GEN_PROGS := timens timerfd timer clock_nanosleep procfs exec futex
 TEST_GEN_PROGS_EXTENDED := gettime_perf
 
 CFLAGS := -Wall -Werror -pthread

tools/testing/selftests/timens/vfork_exec.c

···
-// 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 "log.h"
-#include "timens.h"
-
-#define OFFSET (36000)
-
-int main(int argc, char *argv[])
-{
-	struct timespec now, tst;
-	int status, i;
-	pid_t pid;
-
-	if (argc > 1) {
-		if (sscanf(argv[1], "%ld", &now.tv_sec) != 1)
-			return pr_perror("sscanf");
-
-		for (i = 0; i < 2; i++) {
-			_gettime(CLOCK_MONOTONIC, &tst, i);
-			if (abs(tst.tv_sec - now.tv_sec) > 5)
-				return pr_fail("%ld %ld\n", now.tv_sec, tst.tv_sec);
-		}
-		return 0;
-	}
-
-	nscheck();
-
-	ksft_set_plan(1);
-
-	clock_gettime(CLOCK_MONOTONIC, &now);
-
-	if (unshare_timens())
-		return 1;
-
-	if (_settime(CLOCK_MONOTONIC, OFFSET))
-		return 1;
-
-	for (i = 0; i < 2; i++) {
-		_gettime(CLOCK_MONOTONIC, &tst, i);
-		if (abs(tst.tv_sec - now.tv_sec) > 5)
-			return pr_fail("%ld %ld\n",
-					now.tv_sec, tst.tv_sec);
-	}
-
-	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.
-		for (i = 0; i < 2; i++) {
-			_gettime(CLOCK_MONOTONIC, &tst, i);
-			if (abs(tst.tv_sec - now.tv_sec) > 5)
-				return pr_fail("%ld %ld\n",
-						now.tv_sec, tst.tv_sec);
-		}
-
-		/* 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_test_result_pass("exec\n");
-	ksft_exit_pass();
-	return 0;
-}