1 /* 2 * Check decoding of prctl operations which use arg2 as pointer to an integer 3 * value: PR_GET_CHILD_SUBREAPER, PR_GET_ENDIAN, PR_GET_FPEMU, and PR_GET_FPEXC. 4 * 5 * Copyright (c) 2016 Eugene Syromyatnikov <evgsyr (at) gmail.com> 6 * Copyright (c) 2016 Dmitry V. Levin <ldv (at) altlinux.org> 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 35 #if defined __NR_prctl 36 37 # include <stdint.h> 38 # include <stdio.h> 39 # include <unistd.h> 40 # include <linux/prctl.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_addr1 = 58 (kernel_ulong_t) 0x1e55c0de00000000ULL; 59 static const kernel_ulong_t bogus_addr2 = 60 (kernel_ulong_t) 0xfffffffffffffffdULL; 61 static const kernel_ulong_t bogus_op_bits = 62 (kernel_ulong_t) 0xbadc0ded00000000ULL; 63 static const struct { 64 kernel_ulong_t val; 65 const char *str; 66 } options[] = { 67 { 37, "PR_GET_CHILD_SUBREAPER" }, 68 { 19, "PR_GET_ENDIAN" }, 69 { 9, "PR_GET_FPEMU" }, 70 { 11, "PR_GET_FPEXC" }, 71 }; 72 73 unsigned int *ptr = tail_alloc(sizeof(*ptr)); 74 long rc; 75 unsigned int i; 76 77 for (i = 0; i < ARRAY_SIZE(options); ++i) { 78 prctl(options[i].val | bogus_op_bits, 0); 79 printf("prctl(%s, NULL) = %s\n", options[i].str, errstr); 80 81 if (bogus_addr1) { 82 prctl(options[i].val | bogus_op_bits, bogus_addr1); 83 printf("prctl(%s, %#llx) = %s\n", options[i].str, 84 (unsigned long long) bogus_addr1, errstr); 85 } 86 87 prctl(options[i].val | bogus_op_bits, bogus_addr2); 88 printf("prctl(%s, %#llx) = %s\n", options[i].str, 89 (unsigned long long) bogus_addr2, errstr); 90 91 prctl(options[i].val | bogus_op_bits, (uintptr_t) (ptr + 1)); 92 printf("prctl(%s, %p) = %s\n", options[i].str, 93 ptr + 1, errstr); 94 95 rc = prctl(options[i].val | bogus_op_bits, (uintptr_t) ptr); 96 if (!rc) { 97 printf("prctl(%s, [%u]) = %s\n", 98 options[i].str, *ptr, errstr); 99 } else { 100 printf("prctl(%s, %p) = %s\n", 101 options[i].str, ptr, errstr); 102 } 103 104 if (F8ILL_KULONG_SUPPORTED) { 105 kernel_ulong_t bogus_addr3 = f8ill_ptr_to_kulong(ptr); 106 prctl(options[i].val | bogus_op_bits, bogus_addr3); 107 printf("prctl(%s, %#llx) = %s\n", options[i].str, 108 (unsigned long long) bogus_addr3, errstr); 109 } 110 } 111 112 puts("+++ exited with 0 +++"); 113 return 0; 114 } 115 116 #else 117 118 SKIP_MAIN_UNDEFINED("__NR_prctl") 119 120 #endif 121
