granicus.if.org Git - strace/blob - tests/setreugid.c

   1 /*
   2  * Check decoding of setreuid/setregid/setreuid32/setregid32 syscalls.
   3  *
   4  * Copyright (c) 2016-2018 Dmitry V. Levin <ldv@altlinux.org>
   5  * All rights reserved.
   6  *
   7  * SPDX-License-Identifier: GPL-2.0-or-later
   8  */
   9
  10 #include <errno.h>
  11 #include <stdio.h>
  12 #include <unistd.h>
  13
  14 static int
  15 ugid2int(const unsigned UGID_TYPE ugid)
  16 {
  17         if ((unsigned UGID_TYPE) -1U == ugid)
  18                 return -1;
  19         else
  20                 return ugid;
  21 }
  22
  23 static void
  24 print_int(const unsigned int num)
  25 {
  26         if (num == -1U)
  27                 printf("-1");
  28         else
  29                 printf("%u", num);
  30 }
  31
  32 static int
  33 num_matches_id(const unsigned int num, const unsigned int ugid)
  34 {
  35         return num == ugid || num == -1U;
  36 }
  37
  38 #define PAIR(val)       { val, ugid }, { ugid, val }
  39
  40 int
  41 main(void)
  42 {
  43         unsigned int ugid = GETUGID;
  44         CHECK_OVERFLOWUGID(ugid);
  45
  46         const struct {
  47                 const long r, e;
  48         } tests[] = {
  49                 { ugid, ugid },
  50                 PAIR((unsigned long) 0xffffffff00000000ULL | ugid),
  51                 PAIR(-1U),
  52                 PAIR(-1L),
  53                 PAIR(0xffff0000U | ugid),
  54                 PAIR(0xffff),
  55                 PAIR(0xc0deffffU)
  56         };
  57
  58         unsigned int i;
  59
  60         for (i = 0; i < ARRAY_SIZE(tests); ++i) {
  61                 const unsigned int rn = ugid2int(tests[i].r);
  62                 const unsigned int en = ugid2int(tests[i].e);
  63
  64                 if (!num_matches_id(rn, ugid) || !num_matches_id(en, ugid))
  65                         continue;
  66
  67                 if (syscall(SYSCALL_NR, tests[i].r, tests[i].e)) {
  68                         if (!i && ENOSYS == errno) {
  69                                 printf("%s(%u, %u) = -1 ENOSYS (%m)\n",
  70                                        SYSCALL_NAME, ugid, ugid);
  71                                 break;
  72                         }
  73                         perror_msg_and_fail("%s(%#lx, %#lx)", SYSCALL_NAME,
  74                                             tests[i].r, tests[i].e);
  75                 }
  76
  77                 printf("%s(", SYSCALL_NAME);
  78                 print_int(rn);
  79                 printf(", ");
  80                 print_int(en);
  81                 printf(") = 0\n");
  82         }
  83
  84         puts("+++ exited with 0 +++");
  85         return 0;
  86 }