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

   1 /*
   2  * Check decoding of chown/chown32/lchown/lchown32/fchown/fchown32 syscalls.
   3  *
   4  * Copyright (c) 2016 Dmitry V. Levin <ldv@altlinux.org>
   5  * Copyright (c) 2016-2018 The strace developers.
   6  * All rights reserved.
   7  *
   8  * SPDX-License-Identifier: GPL-2.0-or-later
   9  */
  10
  11 #include <fcntl.h>
  12 #include <stdio.h>
  13 #include <unistd.h>
  14
  15 #ifdef UGID_TYPE_IS_SHORT
  16 # define UGID_TYPE      short
  17 # define GETEUID        syscall(__NR_geteuid)
  18 # define GETEGID        syscall(__NR_getegid)
  19 # define CHECK_OVERFLOWUID(arg) check_overflowuid(arg)
  20 # define CHECK_OVERFLOWGID(arg) check_overflowgid(arg)
  21 #else
  22 # define UGID_TYPE      int
  23 # define GETEUID        geteuid()
  24 # define GETEGID        getegid()
  25 # define CHECK_OVERFLOWUID(arg)
  26 # define CHECK_OVERFLOWGID(arg)
  27 #endif
  28
  29 #define UNLINK_SAMPLE                                   \
  30         do {                                            \
  31                 if (unlink(sample))                     \
  32                         perror_msg_and_fail("unlink");  \
  33         } while (0)
  34
  35 #define CLOSE_SAMPLE                                    \
  36         do {                                            \
  37                 if (close(fd))                          \
  38                         perror_msg_and_fail("close");   \
  39         } while (0)
  40
  41 #ifdef ACCESS_BY_DESCRIPTOR
  42 # define SYSCALL_ARG1 fd
  43 # define FMT_ARG1 "%d"
  44 # define EOK_CMD CLOSE_SAMPLE
  45 # define CLEANUP_CMD UNLINK_SAMPLE
  46 #else
  47 # define SYSCALL_ARG1 sample
  48 # define FMT_ARG1 "\"%s\""
  49 # define EOK_CMD UNLINK_SAMPLE
  50 # define CLEANUP_CMD CLOSE_SAMPLE
  51 #endif
  52
  53 static int
  54 ugid2int(const unsigned UGID_TYPE id)
  55 {
  56         if ((unsigned UGID_TYPE) -1U == id)
  57                 return -1;
  58         else
  59                 return id;
  60 }
  61
  62 static void
  63 print_int(const unsigned int num)
  64 {
  65         if (num == -1U)
  66                 printf(", -1");
  67         else
  68                 printf(", %u", num);
  69 }
  70
  71 static int
  72 num_matches_id(const unsigned int num, const unsigned int id)
  73 {
  74         return num == id || num == -1U;
  75 }
  76
  77 #define PAIR(val)       { val, gid }, { uid, val }
  78
  79 int
  80 main(void)
  81 {
  82         static const char sample[] = SYSCALL_NAME "_sample";
  83
  84         unsigned int uid = GETEUID;
  85         CHECK_OVERFLOWUID(uid);
  86         unsigned int gid = GETEGID;
  87         CHECK_OVERFLOWUID(gid);
  88
  89         const struct {
  90                 const long uid, gid;
  91         } tests[] = {
  92                 { uid, gid },
  93                 { (unsigned long) 0xffffffff00000000ULL | uid, gid },
  94                 { uid, (unsigned long) 0xffffffff00000000ULL | gid },
  95                 PAIR(-1U),
  96                 PAIR(-1L),
  97                 { 0xffff0000U | uid, gid },
  98                 { uid, 0xffff0000U | gid },
  99                 PAIR(0xffff),
 100                 PAIR(0xc0deffffU),
 101                 PAIR(0xfacefeedU),
 102                 PAIR((long) 0xfacefeeddeadbeefULL)
 103         };
 104
 105         int fd = open(sample, O_RDONLY | O_CREAT, 0400);
 106         if (fd < 0)
 107                 perror_msg_and_fail("open");
 108
 109         CLEANUP_CMD;
 110
 111         unsigned int i;
 112         long expected = 0;
 113
 114         for (i = 0; i < ARRAY_SIZE(tests); ++i) {
 115                 const unsigned int unum = ugid2int(tests[i].uid);
 116                 const unsigned int gnum = ugid2int(tests[i].gid);
 117
 118                 if (num_matches_id(unum, uid) &&
 119                     num_matches_id(gnum, gid)) {
 120                         if (expected)
 121                                 continue;
 122                 } else {
 123                         if (!expected) {
 124                                 expected = -1;
 125                                 EOK_CMD;
 126                         }
 127                 }
 128
 129                 const long rc = syscall(SYSCALL_NR, SYSCALL_ARG1,
 130                                         tests[i].uid, tests[i].gid);
 131                 const char *errstr = sprintrc(rc);
 132                 printf("%s(" FMT_ARG1, SYSCALL_NAME, SYSCALL_ARG1);
 133                 print_int(unum);
 134                 print_int(gnum);
 135                 printf(") = %s\n", errstr);
 136         }
 137
 138         puts("+++ exited with 0 +++");
 139         return 0;
 140 }