sewardj | cbdddcf | 2005-03-10 23:23:45 +0000 | [diff] [blame] | 1 | /* Test different kinds of addressability and definedness */ |
| 2 | #include "../memcheck.h" |
njn | 83b62cb | 2009-04-15 03:12:43 +0000 | [diff] [blame] | 3 | #include "tests/sys_mman.h" |
sewardj | cbdddcf | 2005-03-10 23:23:45 +0000 | [diff] [blame] | 4 | #include <stdio.h> |
| 5 | #include <sys/resource.h> |
| 6 | #include <unistd.h> |
| 7 | #include <sys/wait.h> |
| 8 | #include <assert.h> |
| 9 | #include <errno.h> |
| 10 | #include <string.h> |
| 11 | #include <stdlib.h> |
| 12 | |
| 13 | static int pgsz; |
| 14 | |
| 15 | static char *mm(char *addr, int size, int prot) |
| 16 | { |
| 17 | int flags = MAP_PRIVATE | MAP_ANONYMOUS; |
| 18 | char *ret; |
| 19 | |
| 20 | if (addr) |
| 21 | flags |= MAP_FIXED; |
| 22 | |
| 23 | ret = mmap(addr, size, prot, flags, -1, 0); |
| 24 | if (ret == (char *)-1) { |
| 25 | perror("mmap failed"); |
| 26 | exit(1); |
| 27 | } |
| 28 | |
| 29 | return ret; |
| 30 | } |
| 31 | |
| 32 | /* Case 1 - mmaped memory is defined */ |
| 33 | static void test1() |
| 34 | { |
| 35 | char *m = mm(0, pgsz * 5, PROT_READ); |
| 36 | |
njn | dbf7ca7 | 2006-03-31 11:57:59 +0000 | [diff] [blame] | 37 | VALGRIND_CHECK_MEM_IS_DEFINED(m, pgsz*5); /* all defined */ |
sewardj | cbdddcf | 2005-03-10 23:23:45 +0000 | [diff] [blame] | 38 | } |
| 39 | |
| 40 | /* Case 2 - unmapped memory is unaddressable+undefined */ |
| 41 | static void test2() |
| 42 | { |
| 43 | char *m = mm(0, pgsz * 5, PROT_READ|PROT_WRITE); |
njn | dbf7ca7 | 2006-03-31 11:57:59 +0000 | [diff] [blame] | 44 | VALGRIND_CHECK_MEM_IS_DEFINED(m, pgsz*5); /* all OK */ |
sewardj | cbdddcf | 2005-03-10 23:23:45 +0000 | [diff] [blame] | 45 | |
| 46 | munmap(&m[pgsz*2], pgsz); |
| 47 | |
njn | dbf7ca7 | 2006-03-31 11:57:59 +0000 | [diff] [blame] | 48 | VALGRIND_CHECK_MEM_IS_DEFINED(&m[pgsz*2], pgsz); /* undefined */ |
sewardj | cbdddcf | 2005-03-10 23:23:45 +0000 | [diff] [blame] | 49 | |
njn | 1d0825f | 2006-03-27 11:37:07 +0000 | [diff] [blame] | 50 | /* XXX need a memcheck request to test addressability */ |
sewardj | cbdddcf | 2005-03-10 23:23:45 +0000 | [diff] [blame] | 51 | m[pgsz*2] = 'x'; /* unmapped fault */ |
| 52 | } |
| 53 | |
| 54 | /* Case 3 - memory definedness doesn't survive remapping */ |
| 55 | static void test3() |
| 56 | { |
| 57 | char *m = mm(0, pgsz * 5, PROT_READ|PROT_WRITE); |
| 58 | |
njn | dbf7ca7 | 2006-03-31 11:57:59 +0000 | [diff] [blame] | 59 | VALGRIND_MAKE_MEM_UNDEFINED(&m[pgsz], pgsz); |
sewardj | cbdddcf | 2005-03-10 23:23:45 +0000 | [diff] [blame] | 60 | mm(&m[pgsz], pgsz, PROT_READ); |
njn | dbf7ca7 | 2006-03-31 11:57:59 +0000 | [diff] [blame] | 61 | VALGRIND_CHECK_MEM_IS_DEFINED(&m[pgsz], pgsz); /* OK */ |
sewardj | cbdddcf | 2005-03-10 23:23:45 +0000 | [diff] [blame] | 62 | } |
| 63 | |
| 64 | /* Case 4 - mprotect doesn't affect addressability */ |
| 65 | static void test4() |
| 66 | { |
| 67 | char *m = mm(0, pgsz * 5, PROT_READ|PROT_WRITE); |
| 68 | |
| 69 | mprotect(m, pgsz, PROT_WRITE); |
njn | dbf7ca7 | 2006-03-31 11:57:59 +0000 | [diff] [blame] | 70 | VALGRIND_CHECK_MEM_IS_DEFINED(m, pgsz); /* OK */ |
sewardj | cbdddcf | 2005-03-10 23:23:45 +0000 | [diff] [blame] | 71 | m[44] = 'y'; /* OK */ |
| 72 | |
| 73 | mprotect(m, pgsz*5, PROT_NONE); |
| 74 | m[55] = 'x'; /* permission fault, but no tool complaint */ |
| 75 | } |
| 76 | |
| 77 | /* Case 5 - mprotect doesn't affect definedness */ |
| 78 | static void test5() |
| 79 | { |
| 80 | char *m = mm(0, pgsz * 5, PROT_READ|PROT_WRITE); |
| 81 | |
njn | dbf7ca7 | 2006-03-31 11:57:59 +0000 | [diff] [blame] | 82 | VALGRIND_MAKE_MEM_UNDEFINED(m, pgsz*5); |
sewardj | cbdddcf | 2005-03-10 23:23:45 +0000 | [diff] [blame] | 83 | memset(m, 'x', 10); |
njn | dbf7ca7 | 2006-03-31 11:57:59 +0000 | [diff] [blame] | 84 | VALGRIND_CHECK_MEM_IS_DEFINED(m, 10); /* OK */ |
| 85 | VALGRIND_CHECK_MEM_IS_DEFINED(m+10, 10); /* BAD */ |
sewardj | cbdddcf | 2005-03-10 23:23:45 +0000 | [diff] [blame] | 86 | |
| 87 | mprotect(m, pgsz*5, PROT_NONE); |
| 88 | mprotect(m, pgsz*5, PROT_READ); |
| 89 | |
njn | dbf7ca7 | 2006-03-31 11:57:59 +0000 | [diff] [blame] | 90 | VALGRIND_CHECK_MEM_IS_DEFINED(m, 10); /* still OK */ |
| 91 | VALGRIND_CHECK_MEM_IS_DEFINED(m+20, 10); /* BAD */ |
sewardj | cbdddcf | 2005-03-10 23:23:45 +0000 | [diff] [blame] | 92 | } |
| 93 | |
| 94 | static struct test { |
| 95 | void (*test)(void); |
njn | 36fce1b | 2009-04-28 01:55:01 +0000 | [diff] [blame] | 96 | int faults; |
sewardj | cbdddcf | 2005-03-10 23:23:45 +0000 | [diff] [blame] | 97 | } tests[] = { |
| 98 | { test1, 0 }, |
njn | 36fce1b | 2009-04-28 01:55:01 +0000 | [diff] [blame] | 99 | { test2, 1 }, |
sewardj | cbdddcf | 2005-03-10 23:23:45 +0000 | [diff] [blame] | 100 | { test3, 0 }, |
njn | 36fce1b | 2009-04-28 01:55:01 +0000 | [diff] [blame] | 101 | { test4, 1 }, |
sewardj | cbdddcf | 2005-03-10 23:23:45 +0000 | [diff] [blame] | 102 | { test5, 0 }, |
| 103 | }; |
| 104 | static const int n_tests = sizeof(tests)/sizeof(*tests); |
| 105 | |
| 106 | int main() |
| 107 | { |
| 108 | static const struct rlimit zero = { 0, 0 }; |
| 109 | int i; |
| 110 | |
| 111 | pgsz = getpagesize(); |
| 112 | setvbuf(stdout, NULL, _IOLBF, 0); |
| 113 | |
| 114 | setrlimit(RLIMIT_CORE, &zero); |
| 115 | |
| 116 | for(i = 0; i < n_tests; i++) { |
| 117 | int pid; |
| 118 | |
| 119 | pid = fork(); |
| 120 | if (pid == -1) { |
| 121 | perror("fork"); |
| 122 | exit(1); |
| 123 | } |
| 124 | if (pid == 0) { |
| 125 | (*tests[i].test)(); |
| 126 | exit(0); |
| 127 | } else { |
| 128 | int status; |
| 129 | int ret; |
| 130 | |
| 131 | printf("Test %d: ", i+1); |
| 132 | fflush(stdout); |
| 133 | |
| 134 | while((ret = waitpid(pid, &status, 0)) != pid) { |
| 135 | if (errno != EINTR) { |
| 136 | perror("waitpid"); |
| 137 | exit(1); |
| 138 | } |
| 139 | } |
| 140 | if (WIFSIGNALED(status)) { |
| 141 | assert(WTERMSIG(status) != 0); |
| 142 | |
njn | 36fce1b | 2009-04-28 01:55:01 +0000 | [diff] [blame] | 143 | if (1 == tests[i].faults && |
| 144 | (WTERMSIG(status) == SIGSEGV || |
| 145 | WTERMSIG(status) == SIGBUS)) |
sewardj | cbdddcf | 2005-03-10 23:23:45 +0000 | [diff] [blame] | 146 | printf("PASS\n"); |
| 147 | else |
| 148 | printf("died with unexpected signal %d\n", |
| 149 | WTERMSIG(status)); |
| 150 | } else if (WIFEXITED(status)) { |
| 151 | if (WEXITSTATUS(status) == 0) { |
njn | 36fce1b | 2009-04-28 01:55:01 +0000 | [diff] [blame] | 152 | if (tests[i].faults == 0) |
sewardj | cbdddcf | 2005-03-10 23:23:45 +0000 | [diff] [blame] | 153 | printf("PASS\n"); |
| 154 | else |
njn | 36fce1b | 2009-04-28 01:55:01 +0000 | [diff] [blame] | 155 | printf("exited without expected SIGSEGV or SIGBUS signal\n"); |
sewardj | cbdddcf | 2005-03-10 23:23:45 +0000 | [diff] [blame] | 156 | } else |
| 157 | printf("exited with unexpected status %d\n", |
| 158 | WEXITSTATUS(status)); |
| 159 | } else { |
| 160 | printf("strange status %x?\n", status); |
| 161 | } |
| 162 | } |
| 163 | } |
| 164 | exit(0); |
| 165 | } |