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 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 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
