50 lines · cpp
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 in4// application range.5 6// RUN: %clangxx_msan -O0 -DFIXED=0 %s -o %t && %run %t7// RUN: %clangxx_msan -O0 -DFIXED=1 %s -o %t && %run %t8// RUN: %clangxx_msan -O0 -DFIXED=0 -D_FILE_OFFSET_BITS=64 %s -o %t && %run %t9// RUN: %clangxx_msan -O0 -DFIXED=1 -D_FILE_OFFSET_BITS=64 %s -o %t && %run %t10 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#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(__loongarch_lp64)25 uintptr_t hint = 0x4f0000000000ULL;26 const uintptr_t app_start = 0x600000000000ULL;27#elif defined (__mips64)28 uintptr_t hint = 0x4f00000000ULL;29 const uintptr_t app_start = 0x6000000000ULL;30#elif defined (__powerpc64__)31 uintptr_t hint = 0x2f0000000000ULL;32 const uintptr_t app_start = 0x300000000000ULL;33#elif defined(__s390x__)34 uintptr_t hint = 0x07f000000000ULL;35 const uintptr_t app_start = 0x020000000000ULL;36#elif defined (__aarch64__)37 uintptr_t hint = 0X0110000000000;38 // Unfortunately we don't have a stronger condition for this39 const uintptr_t app_start = 0x0ULL;40#endif41 uintptr_t p = (uintptr_t)mmap(42 (void *)hint, 4096, PROT_WRITE,43 MAP_PRIVATE | MAP_ANONYMOUS | (FIXED ? MAP_FIXED : 0), -1, 0);44 if (FIXED)45 assert(p == (uintptr_t)-1 && errno == EINVAL);46 else47 assert(p >= app_start);48 return 0;49}50