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d5b3a1d531
Adds wrapper to vm_read and vm_deallocate memory to allow for safe in-process memory reads during crashes. Also adds a logging utility safe for in-process exception handling. Bug: crashpad: 31 Change-Id: I658f3181cbec40a79e304b7306466e10c003564f Reviewed-on: https://chromium-review.googlesource.com/c/crashpad/crashpad/+/2875349 Reviewed-by: Mark Mentovai <mark@chromium.org> Commit-Queue: Justin Cohen <justincohen@chromium.org>
84 lines
2.8 KiB
C++
84 lines
2.8 KiB
C++
// Copyright 2021 The Crashpad Authors. All rights reserved.
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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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#include "util/ios/scoped_vm_read.h"
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#include <sys/time.h>
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#include "base/mac/scoped_mach_vm.h"
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#include "gtest/gtest.h"
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namespace crashpad {
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namespace test {
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namespace {
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TEST(ScopedVMReadTest, BasicFunctionality) {
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// bad data or count.
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internal::ScopedVMRead<vm_address_t> vmread_bad;
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ASSERT_FALSE(vmread_bad.Read(nullptr, 100));
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ASSERT_FALSE(vmread_bad.Read(reinterpret_cast<void*>(0x1000), 100));
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vm_address_t address = 1;
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ASSERT_FALSE(vmread_bad.Read(&address, 1000000000));
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// array
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constexpr char read_me[] = "read me";
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internal::ScopedVMRead<char> vmread_string;
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ASSERT_TRUE(vmread_string.Read(read_me, strlen(read_me)));
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EXPECT_STREQ(read_me, vmread_string.get());
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// struct
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timeval time_of_day;
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EXPECT_TRUE(gettimeofday(&time_of_day, nullptr) == 0);
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internal::ScopedVMRead<timeval> vmread_time;
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ASSERT_TRUE(vmread_time.Read(&time_of_day));
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EXPECT_EQ(time_of_day.tv_sec, vmread_time->tv_sec);
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EXPECT_EQ(time_of_day.tv_usec, vmread_time->tv_usec);
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// reset.
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timeval time_of_day2;
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EXPECT_TRUE(gettimeofday(&time_of_day2, nullptr) == 0);
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ASSERT_TRUE(vmread_time.Read(&time_of_day2));
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EXPECT_EQ(time_of_day2.tv_sec, vmread_time->tv_sec);
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EXPECT_EQ(time_of_day2.tv_usec, vmread_time->tv_usec);
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}
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TEST(ScopedVMReadTest, MissingMiddleVM) {
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char* region;
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vm_size_t page_size = getpagesize();
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vm_size_t region_size = page_size * 3;
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ASSERT_EQ(vm_allocate(mach_task_self(),
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reinterpret_cast<vm_address_t*>(®ion),
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region_size,
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VM_FLAGS_ANYWHERE),
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0);
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base::mac::ScopedMachVM vm_owner(reinterpret_cast<vm_address_t>(region),
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region_size);
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internal::ScopedVMRead<char> vmread_missing_middle;
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ASSERT_TRUE(vmread_missing_middle.Read(region, region_size));
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// Dealloc middle page.
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ASSERT_EQ(vm_deallocate(mach_task_self(),
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reinterpret_cast<vm_address_t>(region + page_size),
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page_size),
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0);
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ASSERT_FALSE(vmread_missing_middle.Read(region, region_size));
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ASSERT_TRUE(vmread_missing_middle.Read(region, page_size));
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}
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} // namespace
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} // namespace test
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} // namespace crashpad
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