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3e065b11d0
CFI attempts to verify that the dynamic type of a function object matches the static type of the function pointer used to call it. https://clang.llvm.org/docs/ControlFlowIntegrity.html#indirect-function-call-checking However, the analyzer does not have enough information to check cross-dso calls. In these instances, CFI crashes upon calling the function with an error like: pthread_create_linux.cc:60:16: runtime error: control flow integrity check for type 'int (unsigned long *, const pthread_attr_t *, void *(*)(void *), void *)' failed during indirect function call (/lib/x86_64-linux-gnu/libpthread.so.0+0x9200): note: (unknown) defined here pthread_create_linux.cc:60:16: note: check failed in crashpad_handler, destination function located in /lib/x86_64-linux-gnu/libpthread.so.0 Change-Id: Ib29dabfe714f2ee9cc06a5d17e6899ff81a06df4 Reviewed-on: https://chromium-review.googlesource.com/c/crashpad/crashpad/+/2339332 Commit-Queue: Joshua Peraza <jperaza@chromium.org> Reviewed-by: Mark Mentovai <mark@chromium.org>
48 lines
1.6 KiB
C++
48 lines
1.6 KiB
C++
// Copyright 2019 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 <android/log.h>
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#include <dlfcn.h>
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#include <stdlib.h>
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#include "util/misc/no_cfi_icall.h"
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// The first argument passed to the trampoline is the name of the native library
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// exporting the symbol `CrashpadHandlerMain`. The remaining arguments are the
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// same as for `HandlerMain()`.
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int main(int argc, char* argv[]) {
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static constexpr char kTag[] = "crashpad";
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if (argc < 2) {
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__android_log_print(ANDROID_LOG_FATAL, kTag, "usage: %s <path>", argv[0]);
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return EXIT_FAILURE;
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}
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void* handle = dlopen(argv[1], RTLD_LAZY | RTLD_GLOBAL);
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if (!handle) {
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__android_log_print(ANDROID_LOG_FATAL, kTag, "dlopen: %s", dlerror());
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return EXIT_FAILURE;
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}
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using MainType = int (*)(int, char*[]);
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const crashpad::NoCfiIcall<MainType> crashpad_main(
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dlsym(handle, "CrashpadHandlerMain"));
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if (!crashpad_main) {
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__android_log_print(ANDROID_LOG_FATAL, kTag, "dlsym: %s", dlerror());
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return EXIT_FAILURE;
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}
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return crashpad_main(argc - 1, argv + 1);
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}
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