acd6f4f9f5
* HWASan report invalid use of the allocator api (like alignment not being power of two, or allocation size too large) in a way tests do not expect. * Code in .preinit_array runs before HWASan shadow is initialized and needs to be excluded from instrumentation. * It looks that mm system calls (mmap/mprotect/etc) will not allow tagged pointers. In fact, the use of mprotect on malloc()ed memory is doubtful - one can imagine some kind of speculative load from such memory, as compiler knows that it is addressable. Bug: 114279110 Test: bionic-unit-tests with hwasan Change-Id: I6ba4b46a0d554de77c923ad134cf156ce4ddba1b
56 lines
1.8 KiB
C++
56 lines
1.8 KiB
C++
/*
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* Copyright (C) 2017 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <assert.h>
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#include <stdint.h>
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#include <stdlib.h>
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#include "libs_utils.h"
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// This library is built for all targets, including host tests, so __cfi_slowpath may not be
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// present. But it is only used in the bionic loader tests.
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extern "C" __attribute__((weak)) void __cfi_slowpath(uint64_t, void*);
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static int g_count;
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// Mock a CFI-enabled library without relying on the compiler.
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extern "C" __attribute__((no_sanitize("hwaddress"))) __attribute__((aligned(4096)))
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void __cfi_check(uint64_t /*CallSiteTypeId*/, void* /*TargetAddr*/, void* /*Diag*/) {
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++g_count;
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}
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// This code runs before hwasan is initialized.
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__attribute__((no_sanitize("hwaddress")))
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void preinit_ctor() {
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CHECK(g_count == 0);
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__cfi_slowpath(42, reinterpret_cast<void*>(&preinit_ctor));
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CHECK(g_count == 1);
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}
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__attribute__((section(".preinit_array"), used)) void (*preinit_ctor_p)(void) = preinit_ctor;
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__attribute__((constructor, used)) void ctor() {
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CHECK(g_count == 1);
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__cfi_slowpath(42, reinterpret_cast<void*>(&ctor));
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CHECK(g_count == 2);
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}
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int main(void) {
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CHECK(g_count == 2);
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__cfi_slowpath(42, reinterpret_cast<void*>(&main));
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CHECK(g_count == 3);
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return 0;
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}
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