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 * 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 "tests.h" 32 #include <asm/unistd.h> 33 #include <linux/prctl.h> 34 35 #if defined __NR_prctl && defined PR_GET_DUMPABLE && defined PR_SET_DUMPABLE 36 37 # include <stdio.h> 38 # include <unistd.h> 39 40 static const char *errstr; 41 42 static long 43 prctl(kernel_ulong_t arg1, kernel_ulong_t arg2) 44 { 45 static const kernel_ulong_t bogus_arg = 46 (kernel_ulong_t) 0xdeadbeefbadc0dedULL; 47 long rc = syscall(__NR_prctl, arg1, arg2, bogus_arg); 48 errstr = sprintrc(rc); 49 return rc; 50 } 51 52 int 53 main(void) 54 { 55 static const kernel_ulong_t bogus_dumpable1 = 56 (kernel_ulong_t) 0xdeadc0de00000001ULL; 57 static const kernel_ulong_t bogus_dumpable2 = 58 (kernel_ulong_t) 0xdeadc0defacebeefULL; 59 60 static const char * const args[] = { 61 "SUID_DUMP_DISABLE", 62 "SUID_DUMP_USER", 63 "SUID_DUMP_ROOT", 64 }; 65 66 unsigned int i; 67 68 prctl(PR_SET_DUMPABLE, 3); 69 printf("prctl(PR_SET_DUMPABLE, 0x3 /* SUID_DUMP_??? */) = %s\n", 70 errstr); 71 72 prctl(PR_SET_DUMPABLE, bogus_dumpable1); 73 if (bogus_dumpable1 == 1) { 74 printf("prctl(PR_SET_DUMPABLE, SUID_DUMP_USER) = %s\n", errstr); 75 } else { 76 printf("prctl(PR_SET_DUMPABLE, %#llx /* SUID_DUMP_??? */)" 77 " = %s\n", 78 (unsigned long long) bogus_dumpable1, errstr); 79 } 80 81 prctl(PR_SET_DUMPABLE, bogus_dumpable2); 82 printf("prctl(PR_SET_DUMPABLE, %#llx /* SUID_DUMP_??? */) = %s\n", 83 (unsigned long long) bogus_dumpable2, errstr); 84 85 for (i = 0; i < ARRAY_SIZE(args); ++i) { 86 prctl(PR_SET_DUMPABLE, i); 87 printf("prctl(PR_SET_DUMPABLE, %s) = %s\n", args[i], errstr); 88 89 long rc = prctl(PR_GET_DUMPABLE, bogus_dumpable2); 90 if (rc >= 0 && rc < (long) ARRAY_SIZE(args)) { 91 printf("prctl(PR_GET_DUMPABLE) = %s (%s)\n", 92 errstr, args[rc]); 93 } else { 94 printf("prctl(PR_GET_DUMPABLE) = %s\n", errstr); 95 } 96 } 97 98 puts("+++ exited with 0 +++"); 99 return 0; 100 } 101 102 #else 103 104 SKIP_MAIN_UNDEFINED("__NR_prctl && PR_GET_DUMPABLE && PR_SET_DUMPABLE") 105 106 #endif 107
