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      1 /*
      2  * Check decoding of setfsuid/setfsgid/setfsuid32/setfsgid32 syscalls.
      3  *
      4  * Copyright (c) 2016 Dmitry V. Levin <ldv (at) altlinux.org>
      5  * Copyright (c) 2016-2017 The strace developers.
      6  * All rights reserved.
      7  *
      8  * Redistribution and use in source and binary forms, with or without
      9  * modification, are permitted provided that the following conditions
     10  * are met:
     11  * 1. Redistributions of source code must retain the above copyright
     12  *    notice, this list of conditions and the following disclaimer.
     13  * 2. Redistributions in binary form must reproduce the above copyright
     14  *    notice, this list of conditions and the following disclaimer in the
     15  *    documentation and/or other materials provided with the distribution.
     16  * 3. The name of the author may not be used to endorse or promote products
     17  *    derived from this software without specific prior written permission.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     20  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     21  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     22  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     23  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     24  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     25  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     26  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     27  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     28  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     29  */
     30 
     31 #include <stdio.h>
     32 #include <unistd.h>
     33 
     34 void
     35 printuid(unsigned UGID_TYPE id)
     36 {
     37 	if (id == (unsigned UGID_TYPE) -1U)
     38 		printf("-1");
     39 	else
     40 		printf("%u", id);
     41 }
     42 
     43 int
     44 main(void)
     45 {
     46 	unsigned int ugid = GETUGID;
     47 
     48 	const kernel_ulong_t tests[] = {
     49 		ugid,
     50 		0xffff0000U | ugid,
     51 		F8ILL_KULONG_MASK | ugid,
     52 		0xffffU,
     53 		-1U,
     54 		-1L,
     55 		0xc0deffffU,
     56 		0xfacefeedU,
     57 		(long) 0xfacefeeddeadbeefULL
     58 	};
     59 
     60 	unsigned int i;
     61 
     62 	for (i = 0; i < ARRAY_SIZE(tests); ++i) {
     63 		const unsigned int num = (unsigned UGID_TYPE) tests[i];
     64 		unsigned int rc;
     65 
     66 		rc = syscall(SYSCALL_NR, tests[i]);
     67 		printf("%s(", SYSCALL_NAME);
     68 		printuid(num);
     69 		printf(") = %u\n", rc);
     70 
     71 		rc = syscall(SYSCALL_NR, ugid);
     72 		printf("%s(%u) = %u\n", SYSCALL_NAME, ugid, rc);
     73 	}
     74 
     75 	puts("+++ exited with 0 +++");
     76 	return 0;
     77 }
     78