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      1 /*
      2  * Check decoding of setresuid/setresgid/setresuid32/setresgid32 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 <errno.h>
     31 #include <stdio.h>
     32 #include <unistd.h>
     33 
     34 static int
     35 ugid2int(const unsigned UGID_TYPE ugid)
     36 {
     37 	if ((unsigned UGID_TYPE) -1U == ugid)
     38 		return -1;
     39 	else
     40 		return ugid;
     41 }
     42 
     43 static void
     44 print_int(const unsigned int num)
     45 {
     46 	if (num == -1U)
     47 		printf("-1");
     48 	else
     49 		printf("%u", num);
     50 }
     51 
     52 static int
     53 num_matches_id(const unsigned int num, const unsigned int ugid)
     54 {
     55 	return num == ugid || num == -1U;
     56 }
     57 
     58 #define TRIPLE(val)	\
     59 	{ val, ugid, ugid }, { ugid, val, ugid }, { ugid, ugid, val }
     60 
     61 int
     62 main(void)
     63 {
     64 	unsigned int ugid = GETUGID;
     65 	CHECK_OVERFLOWUGID(ugid);
     66 
     67 	const struct {
     68 		const long r, e, s;
     69 	} tests[] = {
     70 		{ ugid, ugid, ugid },
     71 		TRIPLE((unsigned long) 0xffffffff00000000ULL | ugid),
     72 		TRIPLE(-1U),
     73 		TRIPLE(-1L),
     74 		TRIPLE(0xffff0000U | ugid),
     75 		TRIPLE(0xffff),
     76 		TRIPLE(0xc0deffffU)
     77 	};
     78 
     79 	unsigned int i;
     80 
     81 	for (i = 0; i < ARRAY_SIZE(tests); ++i) {
     82 		const unsigned int rn = ugid2int(tests[i].r);
     83 		const unsigned int en = ugid2int(tests[i].e);
     84 		const unsigned int sn = ugid2int(tests[i].s);
     85 
     86 		if (!num_matches_id(rn, ugid) ||
     87 		    !num_matches_id(en, ugid) ||
     88 		    !num_matches_id(sn, ugid))
     89 			continue;
     90 
     91 		if (syscall(SYSCALL_NR, tests[i].r, tests[i].e, tests[i].s)) {
     92 			if (!i && ENOSYS == errno) {
     93 				printf("%s(%u, %u, %u) = -1 ENOSYS (%m)\n",
     94 				       SYSCALL_NAME, ugid, ugid, ugid);
     95 				break;
     96 			}
     97 			perror_msg_and_fail("%s(%#lx, %#lx, %#lx)",
     98 					    SYSCALL_NAME,
     99 					    tests[i].r, tests[i].e, tests[i].s);
    100 		}
    101 
    102 		printf("%s(", SYSCALL_NAME);
    103 		print_int(rn);
    104 		printf(", ");
    105 		print_int(en);
    106 		printf(", ");
    107 		print_int(sn);
    108 		printf(") = 0\n");
    109 	}
    110 
    111 	puts("+++ exited with 0 +++");
    112 	return 0;
    113 }
    114