1  /*
       2   * Check decoding of setuid/setgid/setuid32/setgid32 syscalls.
       3   *
       4   * Copyright (c) 2016 Dmitry V. Levin <ldv@strace.io>
       5   * Copyright (c) 2016-2021 The strace developers.
       6   * All rights reserved.
       7   *
       8   * SPDX-License-Identifier: GPL-2.0-or-later
       9   */
      10  
      11  #include <errno.h>
      12  #include <stdio.h>
      13  #include <unistd.h>
      14  
      15  static void
      16  printuid(unsigned UGID_TYPE id)
      17  {
      18  	if (id == (unsigned UGID_TYPE) -1U)
      19  		printf("-1");
      20  	else
      21  		printf("%u", id);
      22  }
      23  
      24  int
      25  main(void)
      26  {
      27  	unsigned int ugid = GETUGID;
      28  	CHECK_OVERFLOWUGID(ugid);
      29  
      30  	const long tests[] = {
      31  		ugid,
      32  		0xffff0000U | ugid,
      33  		(unsigned long) 0xffffffff00000000ULL | ugid,
      34  		0xffffU,
      35  		-1U,
      36  		-1L
      37  	};
      38  
      39  	for (unsigned int i = 0; i < ARRAY_SIZE(tests); ++i) {
      40  		const unsigned int num = (unsigned UGID_TYPE) tests[i];
      41  		long expected;
      42  
      43  		errno = 0;
      44  
      45  		if (num == ugid)
      46  			expected = 0;
      47  		else if ((UGID_TYPE) num == (UGID_TYPE) -1U)
      48  			expected = -1;
      49  		else
      50  			continue;
      51  
      52  		const long rc = syscall(SYSCALL_NR, tests[i]);
      53  		const char *errstr = sprintrc(rc);
      54  
      55  		if (rc != expected) {
      56  			if (!i && ENOSYS == errno) {
      57  				printf("%s(%u) = %s\n",
      58  				       SYSCALL_NAME, ugid, errstr);
      59  				break;
      60  			}
      61  			perror_msg_and_fail("%s(%#lx) = %ld != %ld",
      62  					    SYSCALL_NAME, tests[i],
      63  					    rc, expected);
      64  		}
      65  
      66  		printf("%s(", SYSCALL_NAME);
      67  		printuid(num);
      68  		printf(") = %s\n", errstr);
      69  	}
      70  
      71  	puts("+++ exited with 0 +++");
      72  	return 0;
      73  }