1  /*
       2   * Check decoding of pidfd_open syscall.
       3   *
       4   * Copyright (c) 2019 Dmitry V. Levin <ldv@strace.io>
       5   * Copyright (c) 2019-2021 The strace developers.
       6   * All rights reserved.
       7   *
       8   * SPDX-License-Identifier: GPL-2.0-or-later
       9   */
      10  
      11  #include "tests.h"
      12  #include "scno.h"
      13  
      14  #include <fcntl.h>
      15  #include <stdio.h>
      16  #include <unistd.h>
      17  #include "kernel_fcntl.h"
      18  #include "pidns.h"
      19  
      20  static const char *errstr;
      21  
      22  static long
      23  k_pidfd_open(const unsigned int pid, const unsigned int flags)
      24  {
      25  	const kernel_ulong_t fill = (kernel_ulong_t) 0xdefaced00000000ULL;
      26  	const kernel_ulong_t bad = (kernel_ulong_t) 0xbadc0dedbadc0dedULL;
      27  	const kernel_ulong_t arg1 = fill | pid;
      28  	const kernel_ulong_t arg2 = fill | flags;
      29  	const long rc = syscall(__NR_pidfd_open,
      30  				arg1, arg2, bad, bad, bad, bad);
      31  	errstr = sprintrc(rc);
      32  	return rc;
      33  }
      34  
      35  int
      36  main(void)
      37  {
      38  	PIDNS_TEST_INIT;
      39  
      40  #if defined PATH_TRACING || defined PRINT_PATHS
      41  	skip_if_unavailable("/proc/self/fd/");
      42  #endif
      43  
      44  #ifdef PATH_TRACING
      45  	static const char path_full[] = "/dev/full";
      46  	(void) close(0);
      47  	if (open(path_full, O_WRONLY))
      48  		perror_msg_and_skip(path_full);
      49  #endif
      50  
      51  	k_pidfd_open(0, 0);
      52  #ifndef PATH_TRACING
      53  	pidns_print_leader();
      54  	printf("pidfd_open(0, 0) = %s\n", errstr);
      55  #endif
      56  
      57  	k_pidfd_open(-1U, 0);
      58  #ifndef PATH_TRACING
      59  	pidns_print_leader();
      60  	printf("pidfd_open(-1, 0) = %s\n", errstr);
      61  #endif
      62  
      63  	k_pidfd_open(0, O_NONBLOCK);
      64  #ifndef PATH_TRACING
      65  	pidns_print_leader();
      66  	printf("pidfd_open(0, PIDFD_NONBLOCK) = %s\n", errstr);
      67  #endif
      68  
      69  	k_pidfd_open(-1U, O_NONBLOCK);
      70  #ifndef PATH_TRACING
      71  	pidns_print_leader();
      72  	printf("pidfd_open(-1, PIDFD_NONBLOCK) = %s\n", errstr);
      73  #endif
      74  
      75  	k_pidfd_open(0, -1U);
      76  #ifndef PATH_TRACING
      77  	pidns_print_leader();
      78  	printf("pidfd_open(0, PIDFD_NONBLOCK|%#x) = %s\n",
      79  	       -1U & (~O_NONBLOCK), errstr);
      80  #endif
      81  
      82  	const unsigned int flags = 0xfacefeed & (~O_NONBLOCK);
      83  	const int pid = getpid();
      84  
      85  	k_pidfd_open(pid, flags);
      86  #ifndef PATH_TRACING
      87  	const char *pid_str = pidns_pid2str(PT_TGID);
      88  	pidns_print_leader();
      89  	printf("pidfd_open(%d%s, %#x /* PIDFD_??? */) = %s\n",
      90  		pid, pid_str, flags, errstr);
      91  #endif
      92  
      93  #ifdef PRINT_PATHS
      94  	long rc = k_pidfd_open(pid, 0);
      95  	if (rc < 0)
      96  		perror_msg_and_skip("pidfd_open");
      97  #else
      98  	k_pidfd_open(pid, 0);
      99  #endif
     100  
     101  #ifndef PATH_TRACING
     102  	pidns_print_leader();
     103  	printf("pidfd_open(%d%s, 0) = "
     104  # if defined PRINT_PIDFD
     105  	       "%ld<pid:%d>\n", pid, pid_str, rc, pid
     106  # elif defined PRINT_PATHS
     107  	       "%ld<anon_inode:[pidfd]>\n", pid, pid_str, rc
     108  # else
     109  	       "%s\n", pid, pid_str, errstr
     110  # endif
     111  	       );
     112  #endif
     113  
     114  	pidns_print_leader();
     115  	puts("+++ exited with 0 +++");
     116  	return 0;
     117  }