src/compiler-rt/test/msan/mmap.cc

   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 >= 0x0000000000ULL && addr <= 0x0200000000ULL) ||
  23          (addr >= 0xa200000000ULL && addr <= 0xc000000000ULL) ||
  24          addr >= 0xe200000000ULL;
  25 #elif defined(__powerpc64__)
  26   return addr < 0x000100000000ULL || addr >= 0x300000000000ULL;
  27 #elif defined(__aarch64__)
  28
  29   struct AddrMapping {
  30     uintptr_t start;
  31     uintptr_t end;
  32   } mappings[] = {
  33     {0x05000000000ULL, 0x06000000000ULL},
  34     {0x07000000000ULL, 0x08000000000ULL},
  35     {0x0F000000000ULL, 0x10000000000ULL},
  36     {0x11000000000ULL, 0x12000000000ULL},
  37     {0x20000000000ULL, 0x21000000000ULL},
  38     {0x2A000000000ULL, 0x2B000000000ULL},
  39     {0x2E000000000ULL, 0x2F000000000ULL},
  40     {0x3B000000000ULL, 0x3C000000000ULL},
  41     {0x3F000000000ULL, 0x40000000000ULL},
  42     {0x0041000000000ULL, 0x0042000000000ULL},
  43     {0x0050000000000ULL, 0x0051000000000ULL},
  44     {0x0058000000000ULL, 0x0059000000000ULL},
  45     {0x0061000000000ULL, 0x0062000000000ULL},
  46     {0x0AAAAA0000000ULL, 0x0AAAB00000000ULL},
  47     {0x0FFFF00000000ULL, 0x1000000000000ULL},
  48   };
  49   const size_t mappingsSize = sizeof (mappings) / sizeof (mappings[0]);
  50
  51   for (int i=0; i<mappingsSize; ++i)
  52     if (addr >= mappings[i].start && addr < mappings[i].end)
  53       return true;
  54   return false;
  55 #endif
  56 }
  57
  58 int main() {
  59   // Large enough to quickly exhaust the entire address space.
  60 #if defined(__mips64) || defined(__aarch64__)
  61   const size_t kMapSize = 0x100000000ULL;
  62 #else
  63   const size_t kMapSize = 0x1000000000ULL;
  64 #endif
  65   int success_count = 0;
  66   while (true) {
  67     void *p = mmap(0, kMapSize, PROT_WRITE,
  68                    MAP_PRIVATE | MAP_ANONYMOUS | MAP_NORESERVE, -1, 0);
  69     printf("%p\n", p);
  70     if (p == MAP_FAILED) {
  71       assert(errno == ENOMEM);
  72       break;
  73     }
  74     assert(AddrIsApp(p));
  75     success_count++;
  76   }
  77   printf("successful mappings: %d\n", success_count);
  78   assert(success_count > 5);
  79 }