tools/testing/selftests/pid_namespace/regression_enomem.c

   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