1 #define _GNU_SOURCE
2 #include <assert.h>
3 #include <errno.h>
4 #include <fcntl.h>
5 #include <linux/types.h>
6 #include <sched.h>
7 #include <signal.h>
8 #include <stdio.h>
9 #include <stdlib.h>
10 #include <string.h>
11 #include <syscall.h>
12 #include <sys/wait.h>
13
14 #include "../kselftest_harness.h"
15 #include "../pidfd/pidfd.h"
16
17 /*
18 * Regression test for:
19 * 35f71bc0a09a ("fork: report pid reservation failure properly")
20 * b26ebfe12f34 ("pid: Fix error return value in some cases")
21 */
22 TEST(regression_enomem)
23 {
24 pid_t pid;
25
26 if (geteuid())
27 EXPECT_EQ(0, unshare(CLONE_NEWUSER));
28
29 EXPECT_EQ(0, unshare(CLONE_NEWPID));
30
31 pid = fork();
32 ASSERT_GE(pid, 0);
33
34 if (pid == 0)
35 exit(EXIT_SUCCESS);
36
37 EXPECT_EQ(0, wait_for_pid(pid));
38
39 pid = fork();
40 ASSERT_LT(pid, 0);
41 ASSERT_EQ(errno, ENOMEM);
42 }
43
44 TEST_HARNESS_MAIN
45
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