1 /* 2 * Check decoding of prctl PR_GET_DUMPABLE/PR_SET_DUMPABLE operations. 3 * 4 * Copyright (c) 2016 Eugene Syromyatnikov <evgsyr (at) gmail.com> 5 * Copyright (c) 2016 Dmitry V. Levin <ldv (at) altlinux.org> 6 * Copyright (c) 2016-2018 The strace developers. 7 * All rights reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. The name of the author may not be used to endorse or promote products 18 * derived from this software without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 21 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 22 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 23 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 24 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 25 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 26 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 27 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 28 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 29 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 #include "tests.h" 33 #include <asm/unistd.h> 34 #include <linux/prctl.h> 35 36 #if defined __NR_prctl && defined PR_GET_DUMPABLE && defined PR_SET_DUMPABLE \ 37 && !defined __ia64__ 38 39 # include <stdio.h> 40 # include <unistd.h> 41 42 static const char *errstr; 43 44 static long 45 prctl(kernel_ulong_t arg1, kernel_ulong_t arg2) 46 { 47 static const kernel_ulong_t bogus_arg = 48 (kernel_ulong_t) 0xdeadbeefbadc0dedULL; 49 long rc = syscall(__NR_prctl, arg1, arg2, bogus_arg); 50 errstr = sprintrc(rc); 51 return rc; 52 } 53 54 int 55 main(void) 56 { 57 static const kernel_ulong_t bogus_dumpable1 = 58 (kernel_ulong_t) 0xdeadc0de00000001ULL; 59 static const kernel_ulong_t bogus_dumpable2 = 60 (kernel_ulong_t) 0xdeadc0defacebeefULL; 61 62 static const char * const args[] = { 63 "SUID_DUMP_DISABLE", 64 "SUID_DUMP_USER", 65 "SUID_DUMP_ROOT", 66 }; 67 68 unsigned int i; 69 70 prctl(PR_SET_DUMPABLE, 3); 71 printf("prctl(PR_SET_DUMPABLE, 0x3 /* SUID_DUMP_??? */) = %s\n", 72 errstr); 73 74 prctl(PR_SET_DUMPABLE, bogus_dumpable1); 75 if (bogus_dumpable1 == 1) { 76 printf("prctl(PR_SET_DUMPABLE, SUID_DUMP_USER) = %s\n", errstr); 77 } else { 78 printf("prctl(PR_SET_DUMPABLE, %#llx /* SUID_DUMP_??? */)" 79 " = %s\n", 80 (unsigned long long) bogus_dumpable1, errstr); 81 } 82 83 prctl(PR_SET_DUMPABLE, bogus_dumpable2); 84 printf("prctl(PR_SET_DUMPABLE, %#llx /* SUID_DUMP_??? */) = %s\n", 85 (unsigned long long) bogus_dumpable2, errstr); 86 87 for (i = 0; i < ARRAY_SIZE(args); ++i) { 88 prctl(PR_SET_DUMPABLE, i); 89 printf("prctl(PR_SET_DUMPABLE, %s) = %s\n", args[i], errstr); 90 91 long rc = prctl(PR_GET_DUMPABLE, bogus_dumpable2); 92 if (rc >= 0 && rc < (long) ARRAY_SIZE(args)) { 93 printf("prctl(PR_GET_DUMPABLE) = %s (%s)\n", 94 errstr, args[rc]); 95 } else { 96 printf("prctl(PR_GET_DUMPABLE) = %s\n", errstr); 97 } 98 } 99 100 puts("+++ exited with 0 +++"); 101 return 0; 102 } 103 104 #else 105 106 SKIP_MAIN_UNDEFINED("__NR_prctl && PR_GET_DUMPABLE && PR_SET_DUMPABLE" 107 " && !__ia64__") 108 109 #endif 110
