forked from OSchip/llvm-project
37 lines
1.1 KiB
C++
37 lines
1.1 KiB
C++
|
// Test that a module constructor can not map memory over the MSan heap
|
||
|
|
// (without MAP_FIXED, of course). Current implementation ensures this by
|
||
|
|
// mapping the heap early, in __msan_init.
|
||
|
|
//
|
||
|
|
// RUN: %clangxx_msan -O0 %s -o %t_1
|
||
|
|
// RUN: %clangxx_msan -O0 -DHEAP_ADDRESS=$(%run %t_1) %s -o %t_2 && %run %t_2
|
||
|
|
//
|
||
|
|
// This test only makes sense for the 64-bit allocator. The 32-bit allocator
|
||
|
|
// does not have a fixed mapping. Exclude platforms that use the 32-bit
|
||
|
|
// allocator.
|
||
|
|
// UNSUPPORTED: target-is-mips64,target-is-mips64el,aarch64
|
||
|
|
|
||
|
|
#include <assert.h>
|
||
|
|
#include <stdio.h>
|
||
|
|
#include <sys/mman.h>
|
||
|
|
#include <stdlib.h>
|
||
|
|
|
||
|
|
#ifdef HEAP_ADDRESS
|
||
|
|
struct A {
|
||
|
|
A() {
|
||
|
|
void *const hint = reinterpret_cast<void *>(HEAP_ADDRESS);
|
||
|
|
void *p = mmap(hint, 4096, PROT_READ | PROT_WRITE,
|
||
|
|
MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
|
||
|
|
// This address must be already mapped. Check that mmap() succeeds, but at a
|
||
|
|
// different address.
|
||
|
|
assert(p != reinterpret_cast<void *>(-1));
|
||
|
|
assert(p != hint);
|
||
|
|
}
|
||
|
|
} a;
|
||
|
|
#endif
|
||
|
|
|
||
|
|
int main() {
|
||
|
|
void *p = malloc(10);
|
||
|
|
printf("0x%zx\n", reinterpret_cast<size_t>(p) & (~0xfff));
|
||
|
|
free(p);
|
||
|
|
}
|