1 // Test that mmap (without MAP_FIXED) always returns valid application addresses.
2 // RUN: %clangxx_msan -O0 %s -o %t && %run %t
3 // RUN: %clangxx_msan -O0 -fsanitize-memory-track-origins %s -o %t && %run %t
4
5 #include <assert.h>
6 #include <errno.h>
7 #include <stdint.h>
8 #include <sys/mman.h>
9 #include <stdio.h>
10 #include <stdlib.h>
11 #include "test.h"
12
AddrIsApp(void * p)13 bool AddrIsApp(void *p) {
14 uintptr_t addr = (uintptr_t)p;
15 #if defined(__FreeBSD__) && defined(__x86_64__)
16 return addr < 0x010000000000ULL || addr >= 0x600000000000ULL;
17 #elif defined(__x86_64__)
18 return (addr >= 0x000000000000ULL && addr < 0x010000000000ULL) ||
19 (addr >= 0x510000000000ULL && addr < 0x600000000000ULL) ||
20 (addr >= 0x700000000000ULL && addr < 0x800000000000ULL);
21 #elif defined(__mips64)
22 return addr >= 0x00e000000000ULL;
23 #elif defined(__powerpc64__)
24 return addr < 0x000100000000ULL || addr >= 0x300000000000ULL;
25 #elif defined(__aarch64__)
26
27 struct AddrMapping {
28 uintptr_t start;
29 uintptr_t end;
30 } mappings[] = {
31 {0x05000000000ULL, 0x06000000000ULL},
32 {0x07000000000ULL, 0x08000000000ULL},
33 {0x0F000000000ULL, 0x10000000000ULL},
34 {0x11000000000ULL, 0x12000000000ULL},
35 {0x20000000000ULL, 0x21000000000ULL},
36 {0x2A000000000ULL, 0x2B000000000ULL},
37 {0x2E000000000ULL, 0x2F000000000ULL},
38 {0x3B000000000ULL, 0x3C000000000ULL},
39 {0x3F000000000ULL, 0x40000000000ULL},
40 };
41 const size_t mappingsSize = sizeof (mappings) / sizeof (mappings[0]);
42
43 for (int i=0; i<mappingsSize; ++i)
44 if (addr >= mappings[i].start && addr < mappings[i].end)
45 return true;
46 return false;
47 #endif
48 }
49
main()50 int main() {
51 // Large enough to quickly exhaust the entire address space.
52 #if defined(__mips64) || defined(__aarch64__)
53 const size_t kMapSize = 0x100000000ULL;
54 #else
55 const size_t kMapSize = 0x1000000000ULL;
56 #endif
57 int success_count = 0;
58 while (true) {
59 void *p = mmap(0, kMapSize, PROT_WRITE,
60 MAP_PRIVATE | MAP_ANONYMOUS | MAP_NORESERVE, -1, 0);
61 printf("%p\n", p);
62 if (p == MAP_FAILED) {
63 assert(errno == ENOMEM);
64 break;
65 }
66 assert(AddrIsApp(p));
67 success_count++;
68 }
69 printf("successful mappings: %d\n", success_count);
70 assert(success_count > 5);
71 }
72