mmap_below_shadow.cpp
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// Test mmap behavior when map address is below shadow range.
// With MAP_FIXED, we return EINVAL.
// Without MAP_FIXED, we ignore the address hint and map somewhere in
// application range.
// RUN: %clangxx_msan -O0 -DFIXED=0 %s -o %t && %run %t
// RUN: %clangxx_msan -O0 -DFIXED=1 %s -o %t && %run %t
// RUN: %clangxx_msan -O0 -DFIXED=0 -D_FILE_OFFSET_BITS=64 %s -o %t && %run %t
// RUN: %clangxx_msan -O0 -DFIXED=1 -D_FILE_OFFSET_BITS=64 %s -o %t && %run %t
#include <assert.h>
#include <errno.h>
#include <stdint.h>
#include <sys/mman.h>
int main(void) {
// Hint address just below shadow.
#if defined(__FreeBSD__) && defined(__x86_64__)
uintptr_t hint = 0x0f0000000000ULL;
const uintptr_t app_start = 0x000000000000ULL;
#elif defined(__x86_64__)
uintptr_t hint = 0x4f0000000000ULL;
const uintptr_t app_start = 0x600000000000ULL;
#elif defined (__mips64)
uintptr_t hint = 0x4f00000000ULL;
const uintptr_t app_start = 0x6000000000ULL;
#elif defined (__powerpc64__)
uintptr_t hint = 0x2f0000000000ULL;
const uintptr_t app_start = 0x300000000000ULL;
#elif defined(__s390x__)
uintptr_t hint = 0x07f000000000ULL;
const uintptr_t app_start = 0x020000000000ULL;
#elif defined (__aarch64__)
uintptr_t hint = 0x4f0000000ULL;
const uintptr_t app_start = 0x7000000000ULL;
#endif
uintptr_t p = (uintptr_t)mmap(
(void *)hint, 4096, PROT_WRITE,
MAP_PRIVATE | MAP_ANONYMOUS | (FIXED ? MAP_FIXED : 0), -1, 0);
if (FIXED)
assert(p == (uintptr_t)-1 && errno == EINVAL);
else
assert(p >= app_start);
return 0;
}