1 /* 2 * Copyright (c) 2002, Intel Corporation. All rights reserved. 3 * Copyright (c) 2012, Cyril Hrubis <chrubis (at) suse.cz> 4 * 5 * This file is licensed under the GPL license. For the full content 6 * of this license, see the COPYING file at the top level of this 7 * source tree. 8 * 9 * MPR An implementation may permit accesses other than those specified by prot; 10 * however, if the Memory Protection option is supported, the implementation 11 * shall not permit a write to succeed where PROT_WRITE has not been set or 12 * shall not permit any access where PROT_NONE alone has been set. 13 * The implementation shall support at least the following values of prot: 14 * PROT_NONE, PROT_READ, PROT_WRITE, and the bitwise-inclusive OR of PROT_READ 15 * and PROT_WRITE. 16 * 17 * Test Steps: 18 * 19 * If the Memory Protection option is supported: 20 * 21 * 1. Spawn a child process. 22 * 2. The child process mmap a memory region setting prot as PROT_NONE. 23 * 3. Try to read the mapped memory. 24 * 4. If the read will triger SIGSEGV, the PASS. 25 * 26 * Please refer to IEEE_1003.1-2001. 2.8.3.3 Memory Protection. 27 */ 28 29 #include <sys/mman.h> 30 #include <sys/types.h> 31 #include <sys/stat.h> 32 #include <sys/wait.h> 33 #include <errno.h> 34 #include <fcntl.h> 35 #include <signal.h> 36 #include <stdio.h> 37 #include <stdlib.h> 38 #include <string.h> 39 #include <unistd.h> 40 #include "posixtest.h" 41 42 int main(void) 43 { 44 #ifdef _POSIX_MEMORY_PROTECTION 45 char tmpfname[256]; 46 ssize_t size = 1024; 47 char data[size]; 48 void *pa; 49 int fd; 50 51 pid_t child; 52 int status; 53 int sig_num; 54 55 snprintf(tmpfname, sizeof(tmpfname), "/tmp/pts_mmap_6_2_%d", getpid()); 56 unlink(tmpfname); 57 fd = open(tmpfname, O_CREAT | O_RDWR | O_EXCL, S_IRUSR | S_IWUSR); 58 if (fd == -1) { 59 printf("Error at open(): %s\n", strerror(errno)); 60 return PTS_UNRESOLVED; 61 } 62 unlink(tmpfname); 63 64 child = fork(); 65 switch (child) { 66 case 0: 67 memset(data, 'a', size); 68 if (write(fd, data, size) != size) { 69 printf("Error at write(): %s\n", strerror(errno)); 70 return PTS_UNRESOLVED; 71 } 72 73 pa = mmap(NULL, size, PROT_NONE, MAP_SHARED, fd, 0); 74 if (pa == MAP_FAILED) { 75 printf("Error at mmap: %s\n", strerror(errno)); 76 return PTS_FAIL; 77 } 78 79 /* Read acess */ 80 if (*(char *)pa != 'a') { 81 printf("Test Fail: The file is not mapped correctly\n"); 82 return PTS_FAIL; 83 } 84 return 0; 85 break; 86 case -1: 87 printf("Error at fork(): %s\n", strerror(errno)); 88 return PTS_UNRESOLVED; 89 break; 90 default: 91 break; 92 } 93 94 waitpid(child, &status, 0); 95 close(fd); 96 97 if (WIFSIGNALED(status)) { 98 sig_num = WTERMSIG(status); 99 printf("Child process terminated by signal %d\n", sig_num); 100 if (sig_num == SIGSEGV) { 101 printf("Got SIGSEGV when reading the mapped memory, " 102 "setting PROT_NOTE\n" "Test PASSED\n"); 103 return PTS_PASS; 104 } 105 } 106 107 if (WIFEXITED(status)) { 108 if (WEXITSTATUS(status) == 0) { 109 printf 110 ("Did not got SIGSEGV when reading the mapped memory, " 111 "setting PROT_NOTE\n" "Test FAILED\n"); 112 return PTS_FAIL; 113 } 114 115 } 116 117 printf("Test Unresolved\n"); 118 return PTS_UNRESOLVED; 119 #else 120 printf("Test Usupported: _POSIX_MEMORY_PROTECTION not defined\n"); 121 return PTS_UNSUPPORTED; 122 #endif 123 } 124