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@gmail.com> 6 * Copyright (c) 2016 Dmitry V. Levin <ldv@altlinux.org> 7 * Copyright (c) 2016-2017 The strace developers. 8 * All rights reserved. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. The name of the author may not be used to endorse or promote products 19 * derived from this software without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 22 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 23 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 24 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 25 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 26 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 27 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 28 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 29 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 30 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 31 */ 32 33 #include "tests.h" 34 #include <asm/unistd.h> 35 36 #if defined __NR_prctl 37 38 # include <stdint.h> 39 # include <stdio.h> 40 # include <unistd.h> 41 # include <linux/prctl.h> 42 43 static const char *errstr; 44 45 static long prctl(kernel_ulong_t arg1,kernel_ulong_t arg2)46 prctl(kernel_ulong_t arg1, kernel_ulong_t arg2) 47 { 48 static const kernel_ulong_t bogus_arg = 49 (kernel_ulong_t) 0xdeadbeefbadc0dedULL; 50 long rc = syscall(__NR_prctl, arg1, arg2, bogus_arg); 51 errstr = sprintrc(rc); 52 return rc; 53 } 54 55 int main(void)56 main(void) 57 { 58 static const kernel_ulong_t bogus_addr1 = 59 (kernel_ulong_t) 0x1e55c0de00000000ULL; 60 static const kernel_ulong_t bogus_addr2 = 61 (kernel_ulong_t) 0xfffffffffffffffdULL; 62 static const kernel_ulong_t bogus_op_bits = 63 (kernel_ulong_t) 0xbadc0ded00000000ULL; 64 static const struct { 65 kernel_ulong_t val; 66 const char *str; 67 } options[] = { 68 { 37, "PR_GET_CHILD_SUBREAPER" }, 69 { 19, "PR_GET_ENDIAN" }, 70 { 9, "PR_GET_FPEMU" }, 71 { 11, "PR_GET_FPEXC" }, 72 }; 73 74 TAIL_ALLOC_OBJECT_CONST_PTR(unsigned int, ptr); 75 long rc; 76 unsigned int i; 77 78 for (i = 0; i < ARRAY_SIZE(options); ++i) { 79 prctl(options[i].val | bogus_op_bits, 0); 80 printf("prctl(%s, NULL) = %s\n", options[i].str, errstr); 81 82 if (bogus_addr1) { 83 prctl(options[i].val | bogus_op_bits, bogus_addr1); 84 printf("prctl(%s, %#llx) = %s\n", options[i].str, 85 (unsigned long long) bogus_addr1, errstr); 86 } 87 88 prctl(options[i].val | bogus_op_bits, bogus_addr2); 89 printf("prctl(%s, %#llx) = %s\n", options[i].str, 90 (unsigned long long) bogus_addr2, errstr); 91 92 prctl(options[i].val | bogus_op_bits, (uintptr_t) (ptr + 1)); 93 printf("prctl(%s, %p) = %s\n", options[i].str, 94 ptr + 1, errstr); 95 96 rc = prctl(options[i].val | bogus_op_bits, (uintptr_t) ptr); 97 if (!rc) { 98 printf("prctl(%s, [%u]) = %s\n", 99 options[i].str, *ptr, errstr); 100 } else { 101 printf("prctl(%s, %p) = %s\n", 102 options[i].str, ptr, errstr); 103 } 104 105 if (F8ILL_KULONG_SUPPORTED) { 106 kernel_ulong_t bogus_addr3 = f8ill_ptr_to_kulong(ptr); 107 prctl(options[i].val | bogus_op_bits, bogus_addr3); 108 printf("prctl(%s, %#llx) = %s\n", options[i].str, 109 (unsigned long long) bogus_addr3, errstr); 110 } 111 } 112 113 puts("+++ exited with 0 +++"); 114 return 0; 115 } 116 117 #else 118 119 SKIP_MAIN_UNDEFINED("__NR_prctl") 120 121 #endif 122