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      1 /*
      2  * Check decoding of chown/chown32/lchown/lchown32/fchown/fchown32 syscalls.
      3  *
      4  * Copyright (c) 2016 Dmitry V. Levin <ldv (at) altlinux.org>
      5  * All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  * 3. The name of the author may not be used to endorse or promote products
     16  *    derived from this software without specific prior written permission.
     17  *
     18  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     19  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     20  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     21  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     22  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     23  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     24  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     25  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     26  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     27  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     28  */
     29 
     30 #include <fcntl.h>
     31 #include <stdio.h>
     32 #include <unistd.h>
     33 
     34 #ifdef UGID_TYPE_IS_SHORT
     35 # define UGID_TYPE	short
     36 # define GETEUID	syscall(__NR_geteuid)
     37 # define GETEGID	syscall(__NR_getegid)
     38 # define CHECK_OVERFLOWUID(arg)	check_overflowuid(arg)
     39 # define CHECK_OVERFLOWGID(arg)	check_overflowgid(arg)
     40 #else
     41 # define UGID_TYPE	int
     42 # define GETEUID	geteuid()
     43 # define GETEGID	getegid()
     44 # define CHECK_OVERFLOWUID(arg)
     45 # define CHECK_OVERFLOWGID(arg)
     46 #endif
     47 
     48 #define UNLINK_SAMPLE \
     49 	if (unlink(sample)) perror_msg_and_fail("unlink")
     50 #define CLOSE_SAMPLE \
     51 	if (close(fd)) perror_msg_and_fail("close")
     52 
     53 #ifdef ACCESS_BY_DESCRIPTOR
     54 # define SYSCALL_ARG1 fd
     55 # define FMT_ARG1 "%d"
     56 # define EOK_CMD CLOSE_SAMPLE
     57 # define CLEANUP_CMD UNLINK_SAMPLE
     58 #else
     59 # define SYSCALL_ARG1 sample
     60 # define FMT_ARG1 "\"%s\""
     61 # define EOK_CMD UNLINK_SAMPLE
     62 # define CLEANUP_CMD CLOSE_SAMPLE
     63 #endif
     64 
     65 static int
     66 ugid2int(const unsigned UGID_TYPE id)
     67 {
     68 	if ((unsigned UGID_TYPE) -1U == id)
     69 		return -1;
     70 	else
     71 		return id;
     72 }
     73 
     74 static void
     75 print_int(const unsigned int num)
     76 {
     77 	if (num == -1U)
     78 		printf(", -1");
     79 	else
     80 		printf(", %u", num);
     81 }
     82 
     83 static int
     84 num_matches_id(const unsigned int num, const unsigned int id)
     85 {
     86 	return num == id || num == -1U;
     87 }
     88 
     89 #define PAIR(val)	{ val, gid }, { uid, val }
     90 
     91 int
     92 main(void)
     93 {
     94 	static const char sample[] = SYSCALL_NAME "_sample";
     95 
     96 	unsigned int uid = GETEUID;
     97 	CHECK_OVERFLOWUID(uid);
     98 	unsigned int gid = GETEGID;
     99 	CHECK_OVERFLOWUID(gid);
    100 
    101 	const struct {
    102 		const long uid, gid;
    103 	} tests[] = {
    104 		{ uid, gid },
    105 		{ (unsigned long) 0xffffffff00000000ULL | uid, gid },
    106 		{ uid, (unsigned long) 0xffffffff00000000ULL | gid },
    107 		PAIR(-1U),
    108 		PAIR(-1L),
    109 		{ 0xffff0000U | uid, gid },
    110 		{ uid, 0xffff0000U | gid },
    111 		PAIR(0xffff),
    112 		PAIR(0xc0deffffU),
    113 		PAIR(0xfacefeedU),
    114 		PAIR((long) 0xfacefeeddeadbeefULL)
    115 	};
    116 
    117 	int fd = open(sample, O_RDONLY | O_CREAT, 0400);
    118 	if (fd < 0)
    119 		perror_msg_and_fail("open");
    120 
    121 	CLEANUP_CMD;
    122 
    123 	unsigned int i;
    124 	long expected = 0;
    125 
    126 	for (i = 0; i < ARRAY_SIZE(tests); ++i) {
    127 		const unsigned int unum = ugid2int(tests[i].uid);
    128 		const unsigned int gnum = ugid2int(tests[i].gid);
    129 
    130 		if (num_matches_id(unum, uid) &&
    131 		    num_matches_id(gnum, gid)) {
    132 			if (expected)
    133 				continue;
    134 		} else {
    135 			if (!expected) {
    136 				expected = -1;
    137 				EOK_CMD;
    138 			}
    139 		}
    140 
    141 		const long rc = syscall(SYSCALL_NR, SYSCALL_ARG1,
    142 					tests[i].uid, tests[i].gid);
    143 		const char *errstr = sprintrc(rc);
    144 		printf("%s(" FMT_ARG1, SYSCALL_NAME, SYSCALL_ARG1);
    145 		print_int(unum);
    146 		print_int(gnum);
    147 		printf(") = %s\n", errstr);
    148 	}
    149 
    150 	puts("+++ exited with 0 +++");
    151 	return 0;
    152 }
    153