1 // Test that a module constructor can not map memory over the MSan heap 2 // (without MAP_FIXED, of course). Current implementation ensures this by 3 // mapping the heap early, in __msan_init. 4 // 5 // RUN: %clangxx_msan -O0 %s -o %t_1 6 // RUN: %clangxx_msan -O0 -DHEAP_ADDRESS=$(%run %t_1) %s -o %t_2 && %run %t_2 7 // 8 // This test only makes sense for the 64-bit allocator. The 32-bit allocator 9 // does not have a fixed mapping. Exclude platforms that use the 32-bit 10 // allocator. 11 // UNSUPPORTED: mips64,aarch64 12 13 #include <assert.h> 14 #include <stdio.h> 15 #include <sys/mman.h> 16 #include <stdlib.h> 17 18 #ifdef HEAP_ADDRESS 19 struct A { 20 A() { 21 void *const hint = reinterpret_cast<void *>(HEAP_ADDRESS); 22 void *p = mmap(hint, 4096, PROT_READ | PROT_WRITE, 23 MAP_PRIVATE | MAP_ANONYMOUS, -1, 0); 24 // This address must be already mapped. Check that mmap() succeeds, but at a 25 // different address. 26 assert(p != reinterpret_cast<void *>(-1)); 27 assert(p != hint); 28 } 29 } a; 30 #endif 31 32 int main() { 33 void *p = malloc(10); 34 printf("0x%zx\n", reinterpret_cast<size_t>(p) & (~0xfff)); 35 free(p); 36 } 37
