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This makes UniversalMachExcServer available on iOS. UniversalMachExcServer is the foundation for a Mach exc and mach_exc server. Some code in UniversalMachExcServer needs to be evaluated to ensure that portions that run in the same process that has sustained the exception are safe to do so at that time. For example, SimplifiedExcServer<ExcTraits>::Interface instantiates and appends to a std::vector<>, which is generally unsafe in this context. However, that code responds to exc requests. The mach_exc equivalent, SimplifiedMachExcServer<MachExcTraits>::Interface, does not use a vector at all. This also enables support code in the form of CompositeMachMessageServer and UniversalExceptionRaise, all of the tests for CompositeMachMessageServer, and most of the test for exc_server_variants.cc. The multiprocess-based exc_server_variants tests remain disabled on iOS. Bug: crashpad:31 Change-Id: I838ed770a33ca29c37383c32245eb340fb3ad2fb Reviewed-on: https://chromium-review.googlesource.com/c/crashpad/crashpad/+/2159287 Reviewed-by: Justin Cohen <justincohen@chromium.org> Commit-Queue: Mark Mentovai <mark@chromium.org>
113 lines
3.8 KiB
C++
113 lines
3.8 KiB
C++
// Copyright 2014 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/mach/mach_extensions.h"
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#include <Availability.h>
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#include <AvailabilityMacros.h>
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#include <pthread.h>
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#include "base/mac/mach_logging.h"
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#include "build/build_config.h"
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#include "util/mac/mac_util.h"
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namespace crashpad {
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thread_t MachThreadSelf() {
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// The pthreads library keeps its own copy of the thread port. Using it does
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// not increment its reference count.
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return pthread_mach_thread_np(pthread_self());
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}
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mach_port_t NewMachPort(mach_port_right_t right) {
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mach_port_t port = MACH_PORT_NULL;
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kern_return_t kr = mach_port_allocate(mach_task_self(), right, &port);
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MACH_LOG_IF(ERROR, kr != KERN_SUCCESS, kr) << "mach_port_allocate";
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return port;
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}
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exception_mask_t ExcMaskAll() {
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// This is necessary because of the way that the kernel validates
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// exception_mask_t arguments to
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// {host,task,thread}_{get,set,swap}_exception_ports(). It is strict,
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// rejecting attempts to operate on any bits that it does not recognize. See
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// 10.9.4 xnu-2422.110.17/osfmk/mach/ipc_host.c and
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// xnu-2422.110.17/osfmk/mach/ipc_tt.c.
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#if defined(OS_IOS) && __IPHONE_OS_VERSION_MIN_REQUIRED < __IPHONE_7_0
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// iOS 7 ≅ OS X 10.9.
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#error This code was not ported to iOS versions older than 7
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#endif
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#if !defined(OS_IOS) && MAC_OS_X_VERSION_MIN_REQUIRED < MAC_OS_X_VERSION_10_9
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const int mac_os_x_minor_version = MacOSXMinorVersion();
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#endif
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// See 10.6.8 xnu-1504.15.3/osfmk/mach/exception_types.h. 10.7 uses the same
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// definition as 10.6. See 10.7.5 xnu-1699.32.7/osfmk/mach/exception_types.h
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constexpr exception_mask_t kExcMaskAll_10_6 =
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EXC_MASK_BAD_ACCESS |
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EXC_MASK_BAD_INSTRUCTION |
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EXC_MASK_ARITHMETIC |
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EXC_MASK_EMULATION |
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EXC_MASK_SOFTWARE |
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EXC_MASK_BREAKPOINT |
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EXC_MASK_SYSCALL |
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EXC_MASK_MACH_SYSCALL |
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EXC_MASK_RPC_ALERT |
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EXC_MASK_MACHINE;
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#if !defined(OS_IOS) && MAC_OS_X_VERSION_MIN_REQUIRED < MAC_OS_X_VERSION_10_8
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if (mac_os_x_minor_version < 8) {
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return kExcMaskAll_10_6;
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}
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#endif
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// 10.8 added EXC_MASK_RESOURCE. See 10.8.5
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// xnu-2050.48.11/osfmk/mach/exception_types.h.
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constexpr exception_mask_t kExcMaskAll_10_8 =
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kExcMaskAll_10_6 | EXC_MASK_RESOURCE;
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#if !defined(OS_IOS) && MAC_OS_X_VERSION_MIN_REQUIRED < MAC_OS_X_VERSION_10_9
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if (mac_os_x_minor_version < 9) {
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return kExcMaskAll_10_8;
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}
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#endif
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// 10.9 added EXC_MASK_GUARD. See 10.9.4
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// xnu-2422.110.17/osfmk/mach/exception_types.h.
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constexpr exception_mask_t kExcMaskAll_10_9 =
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kExcMaskAll_10_8 | EXC_MASK_GUARD;
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return kExcMaskAll_10_9;
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}
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exception_mask_t ExcMaskValid() {
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const exception_mask_t kExcMaskValid_10_6 = ExcMaskAll() | EXC_MASK_CRASH;
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#if defined(OS_IOS) && __IPHONE_OS_VERSION_MIN_REQUIRED < __IPHONE_9_0
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// iOS 9 ≅ OS X 10.11.
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#error This code was not ported to iOS versions older than 9
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#endif
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#if !defined(OS_IOS) && MAC_OS_X_VERSION_MIN_REQUIRED < MAC_OS_X_VERSION_10_11
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if (MacOSXMinorVersion() < 11) {
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return kExcMaskValid_10_6;
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}
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#endif
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// 10.11 added EXC_MASK_CORPSE_NOTIFY. See 10.11 <mach/exception_types.h>.
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const exception_mask_t kExcMaskValid_10_11 =
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kExcMaskValid_10_6 | EXC_MASK_CORPSE_NOTIFY;
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return kExcMaskValid_10_11;
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}
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} // namespace crashpad
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