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.h"
  15 #include "../kselftest_harness.h"
  16 #include "../pidfd/pidfd.h"
  17
  18 /*
  19  * Regression test for:
  20  * 35f71bc0a09a ("fork: report pid reservation failure properly")
  21  * b26ebfe12f34 ("pid: Fix error return value in some cases")
  22  */
  23 TEST(regression_enomem)
  24 {
  25         pid_t pid;
  26
  27         if (geteuid())
  28                 EXPECT_EQ(0, unshare(CLONE_NEWUSER));
  29
  30         EXPECT_EQ(0, unshare(CLONE_NEWPID));
  31
  32         pid = fork();
  33         ASSERT_GE(pid, 0);
  34
  35         if (pid == 0)
  36                 exit(EXIT_SUCCESS);
  37
  38         EXPECT_EQ(0, wait_for_pid(pid));
  39
  40         pid = fork();
  41         ASSERT_LT(pid, 0);
  42         ASSERT_EQ(errno, ENOMEM);
  43 }
  44
  45 TEST_HARNESS_MAIN