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 write to 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 void *pa; 47 size_t size = 1024; 48 int fd; 49 50 pid_t child; 51 int status; 52 int sig_num; 53 54 snprintf(tmpfname, sizeof(tmpfname), "/tmp/pts_mmap_6_2_%d", getpid()); 55 unlink(tmpfname); 56 fd = open(tmpfname, O_CREAT | O_RDWR | O_EXCL, S_IRUSR | S_IWUSR); 57 if (fd == -1) { 58 printf("Error at open(): %s\n", strerror(errno)); 59 return PTS_UNRESOLVED; 60 } 61 unlink(tmpfname); 62 63 child = fork(); 64 switch (child) { 65 case 0: 66 pa = mmap(NULL, size, PROT_NONE, MAP_SHARED, fd, 0); 67 if (pa == MAP_FAILED) { 68 printf("Error at mmap: %s\n", strerror(errno)); 69 return PTS_FAIL; 70 } 71 72 /* Write acess */ 73 *(char *)pa = 'b'; 74 return 0; 75 break; 76 case -1: 77 perror("fork()"); 78 return PTS_UNRESOLVED; 79 break; 80 default: 81 break; 82 } 83 84 waitpid(child, &status, 0); 85 close(fd); 86 87 if (WIFSIGNALED(status)) { 88 sig_num = WTERMSIG(status); 89 printf("Child process terminated by signal %d\n", sig_num); 90 if (sig_num == SIGSEGV) { 91 printf("Got SIGSEGV when writing to the mapped memory, " 92 "setting PROT_NOTE\n" "Test PASSED\n"); 93 return PTS_PASS; 94 } 95 } 96 97 if (WIFEXITED(status)) { 98 if (WEXITSTATUS(status) == 0) { 99 printf 100 ("Did not got SIGSEGV when writing to the mapped memory, " 101 "setting PROT_NOTE\n" "Test FAILED\n"); 102 return PTS_FAIL; 103 } 104 105 } 106 107 printf("Test Unresolved\n"); 108 return PTS_UNRESOLVED; 109 #else 110 printf("Test Usupported: _POSIX_MEMORY_PROTECTION not defined\n"); 111 return PTS_UNSUPPORTED; 112 #endif 113 } 114