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