| // 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; |
| } |