1 /* 2 * Check decoding of prctl PR_GET_TID_ADDRESS operation. 3 * 4 * Copyright (c) 2016 Eugene Syromyatnikov <evgsyr (at) gmail.com> 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 "tests.h" 32 #include <asm/unistd.h> 33 #include <linux/prctl.h> 34 35 #if defined __NR_prctl && defined __NR_set_tid_address && \ 36 defined PR_GET_TID_ADDRESS 37 38 # include <inttypes.h> 39 # include <stdio.h> 40 # include <unistd.h> 41 42 static const char * 43 sprintaddr(kernel_ulong_t addr) 44 { 45 static char buf[sizeof("0x") + sizeof(addr) * 2]; 46 47 if (addr) { 48 snprintf(buf, sizeof(buf), "%#llx", (unsigned long long) addr); 49 50 return buf; 51 } 52 53 return "NULL"; 54 } 55 56 int 57 main(void) 58 { 59 static const kernel_ulong_t bogus_addr = 60 (kernel_ulong_t) 0xfffffffffffffffdULL; 61 62 /* Note that kernel puts kernel-sized pointer even on x32 */ 63 TAIL_ALLOC_OBJECT_CONST_PTR(kernel_ulong_t, ptr); 64 long rc; 65 long set_ok; 66 67 *ptr = (kernel_ulong_t) 0xbadc0dedda7a1057ULL; 68 69 rc = syscall(__NR_prctl, PR_GET_TID_ADDRESS, NULL); 70 printf("prctl(PR_GET_TID_ADDRESS, NULL) = %s\n", sprintrc(rc)); 71 72 rc = syscall(__NR_prctl, PR_GET_TID_ADDRESS, bogus_addr); 73 printf("prctl(PR_GET_TID_ADDRESS, %#llx) = %s\n", 74 (unsigned long long) bogus_addr, sprintrc(rc)); 75 76 rc = syscall(__NR_prctl, PR_GET_TID_ADDRESS, ptr); 77 if (rc) { 78 printf("prctl(PR_GET_TID_ADDRESS, %p) = %s\n", 79 ptr, sprintrc(rc)); 80 } else { 81 printf("prctl(PR_GET_TID_ADDRESS, [%s]) = %s\n", 82 sprintaddr(*ptr), sprintrc(rc)); 83 } 84 85 set_ok = syscall(__NR_set_tid_address, bogus_addr); 86 87 rc = syscall(__NR_prctl, PR_GET_TID_ADDRESS, ptr); 88 if (rc) { 89 printf("prctl(PR_GET_TID_ADDRESS, %p) = %s\n", 90 ptr, sprintrc(rc)); 91 } else { 92 printf("prctl(PR_GET_TID_ADDRESS, [%s]) = %s\n", 93 sprintaddr(set_ok ? bogus_addr : *ptr), sprintrc(rc)); 94 } 95 96 puts("+++ exited with 0 +++"); 97 return 0; 98 } 99 100 #else 101 102 SKIP_MAIN_UNDEFINED("__NR_prctl && __NR_set_tid_address && PR_GET_TID_ADDRESS") 103 104 #endif 105
