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 -m64 -O0 -DFIXED=0 %s -o %t && %run %t
7// RUN: %clangxx_msan -m64 -O0 -DFIXED=1 %s -o %t && %run %t
8// RUN: %clangxx_msan -m64 -O0 -DFIXED=0 -D_FILE_OFFSET_BITS=64 %s -o %t && %run %t
9// RUN: %clangxx_msan -m64 -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
16int main(void) {
17  // Hint address just below shadow.
18  uintptr_t hint = 0x4f0000000000ULL;
19  const uintptr_t app_start = 0x600000000000ULL;
20  uintptr_t p = (uintptr_t)mmap(
21      (void *)hint, 4096, PROT_WRITE,
22      MAP_PRIVATE | MAP_ANONYMOUS | (FIXED ? MAP_FIXED : 0), -1, 0);
23  if (FIXED)
24    assert(p == (uintptr_t)-1 && errno == EINVAL);
25  else
26    assert(p >= app_start);
27  return 0;
28}
29