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

   1 /*
   2  * Check decoding of setresuid/setresgid/setresuid32/setresgid32 syscalls.
   3  *
   4  * Copyright (c) 2016 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 TRIPLE(val)     \
  39         { val, ugid, ugid }, { ugid, val, ugid }, { ugid, ugid, val }
  40
  41 int
  42 main(void)
  43 {
  44         unsigned int ugid = GETUGID;
  45         CHECK_OVERFLOWUGID(ugid);
  46
  47         const struct {
  48                 const long r, e, s;
  49         } tests[] = {
  50                 { ugid, ugid, ugid },
  51                 TRIPLE((unsigned long) 0xffffffff00000000ULL | ugid),
  52                 TRIPLE(-1U),
  53                 TRIPLE(-1L),
  54                 TRIPLE(0xffff0000U | ugid),
  55                 TRIPLE(0xffff),
  56                 TRIPLE(0xc0deffffU)
  57         };
  58
  59         unsigned int i;
  60
  61         for (i = 0; i < ARRAY_SIZE(tests); ++i) {
  62                 const unsigned int rn = ugid2int(tests[i].r);
  63                 const unsigned int en = ugid2int(tests[i].e);
  64                 const unsigned int sn = ugid2int(tests[i].s);
  65
  66                 if (!num_matches_id(rn, ugid) ||
  67                     !num_matches_id(en, ugid) ||
  68                     !num_matches_id(sn, ugid))
  69                         continue;
  70
  71                 if (syscall(SYSCALL_NR, tests[i].r, tests[i].e, tests[i].s)) {
  72                         if (!i && ENOSYS == errno) {
  73                                 printf("%s(%u, %u, %u) = -1 ENOSYS (%m)\n",
  74                                        SYSCALL_NAME, ugid, ugid, ugid);
  75                                 break;
  76                         }
  77                         perror_msg_and_fail("%s(%#lx, %#lx, %#lx)",
  78                                             SYSCALL_NAME,
  79                                             tests[i].r, tests[i].e, tests[i].s);
  80                 }
  81
  82                 printf("%s(", SYSCALL_NAME);
  83                 print_int(rn);
  84                 printf(", ");
  85                 print_int(en);
  86                 printf(", ");
  87                 print_int(sn);
  88                 printf(") = 0\n");
  89         }
  90
  91         puts("+++ exited with 0 +++");
  92         return 0;
  93 }