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

   1 // Test mmap behavior when map address is below shadow range.
   2 // With MAP_FIXED, we return EINVAL.
   3 // Without MAP_FIXED, we ignore the address hint and map somewhere in
   4 // application range.
   5
   6 // RUN: %clangxx_msan -O0 -DFIXED=0 %s -o %t && %run %t
   7 // RUN: %clangxx_msan -O0 -DFIXED=1 %s -o %t && %run %t
   8 // RUN: %clangxx_msan -O0 -DFIXED=0 -D_FILE_OFFSET_BITS=64 %s -o %t && %run %t
   9 // RUN: %clangxx_msan -O0 -DFIXED=1 -D_FILE_OFFSET_BITS=64 %s -o %t && %run %t
  10
  11 #include <assert.h>
  12 #include <errno.h>
  13 #include <stdint.h>
  14 #include <sys/mman.h>
  15
  16 int main(void) {
  17   // Hint address just below shadow.
  18 #if defined(__FreeBSD__) && defined(__x86_64__)
  19   uintptr_t hint = 0x0f0000000000ULL;
  20   const uintptr_t app_start = 0x000000000000ULL;
  21 #elif defined(__x86_64__)
  22   uintptr_t hint = 0x4f0000000000ULL;
  23   const uintptr_t app_start = 0x600000000000ULL;
  24 #elif defined (__mips64)
  25   uintptr_t hint = 0x4f00000000ULL;
  26   const uintptr_t app_start = 0x6000000000ULL;
  27 #elif defined (__powerpc64__)
  28   uintptr_t hint = 0x2f0000000000ULL;
  29   const uintptr_t app_start = 0x300000000000ULL;
  30 #elif defined (__aarch64__)
  31   uintptr_t hint = 0x4f0000000ULL;
  32   const uintptr_t app_start = 0x7000000000ULL;
  33 #endif
  34   uintptr_t p = (uintptr_t)mmap(
  35       (void *)hint, 4096, PROT_WRITE,
  36       MAP_PRIVATE | MAP_ANONYMOUS | (FIXED ? MAP_FIXED : 0), -1, 0);
  37   if (FIXED)
  38     assert(p == (uintptr_t)-1 && errno == EINVAL);
  39   else
  40     assert(p >= app_start);
  41   return 0;
  42 }