mirror of
https://github.com/klzgrad/naiveproxy.git
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278 lines
8.2 KiB
C++
278 lines
8.2 KiB
C++
// Copyright (c) 2012 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "base/debug/debugger.h"
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#include <errno.h>
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#include <fcntl.h>
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#include <stddef.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <sys/param.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <unistd.h>
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#include <memory>
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#include <vector>
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#include "base/macros.h"
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#include "base/test/clang_coverage.h"
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#include "base/threading/platform_thread.h"
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#include "base/time/time.h"
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#include "build/build_config.h"
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#if defined(__GLIBCXX__)
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#include <cxxabi.h>
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#endif
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#if defined(OS_MACOSX)
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#include <AvailabilityMacros.h>
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#endif
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#if defined(OS_MACOSX) || defined(OS_BSD)
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#include <sys/sysctl.h>
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#endif
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#if defined(OS_FREEBSD)
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#include <sys/user.h>
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#endif
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#include <ostream>
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#include "base/debug/alias.h"
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#include "base/logging.h"
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#include "base/posix/eintr_wrapper.h"
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#include "base/strings/string_piece.h"
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#if defined(USE_SYMBOLIZE)
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#include "base/third_party/symbolize/symbolize.h"
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#endif
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#if defined(OS_ANDROID)
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#include "base/threading/platform_thread.h"
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#endif
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namespace base {
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namespace debug {
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#if defined(OS_MACOSX) || defined(OS_BSD)
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// Based on Apple's recommended method as described in
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// http://developer.apple.com/qa/qa2004/qa1361.html
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bool BeingDebugged() {
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// NOTE: This code MUST be async-signal safe (it's used by in-process
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// stack dumping signal handler). NO malloc or stdio is allowed here.
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//
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// While some code used below may be async-signal unsafe, note how
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// the result is cached (see |is_set| and |being_debugged| static variables
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// right below). If this code is properly warmed-up early
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// in the start-up process, it should be safe to use later.
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// If the process is sandboxed then we can't use the sysctl, so cache the
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// value.
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static bool is_set = false;
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static bool being_debugged = false;
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if (is_set)
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return being_debugged;
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// Initialize mib, which tells sysctl what info we want. In this case,
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// we're looking for information about a specific process ID.
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int mib[] = {
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CTL_KERN,
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KERN_PROC,
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KERN_PROC_PID,
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getpid()
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#if defined(OS_OPENBSD)
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, sizeof(struct kinfo_proc),
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0
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#endif
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};
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// Caution: struct kinfo_proc is marked __APPLE_API_UNSTABLE. The source and
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// binary interfaces may change.
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struct kinfo_proc info;
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size_t info_size = sizeof(info);
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#if defined(OS_OPENBSD)
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if (sysctl(mib, arraysize(mib), NULL, &info_size, NULL, 0) < 0)
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return -1;
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mib[5] = (info_size / sizeof(struct kinfo_proc));
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#endif
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int sysctl_result = sysctl(mib, arraysize(mib), &info, &info_size, NULL, 0);
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DCHECK_EQ(sysctl_result, 0);
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if (sysctl_result != 0) {
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is_set = true;
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being_debugged = false;
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return being_debugged;
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}
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// This process is being debugged if the P_TRACED flag is set.
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is_set = true;
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#if defined(OS_FREEBSD)
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being_debugged = (info.ki_flag & P_TRACED) != 0;
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#elif defined(OS_BSD)
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being_debugged = (info.p_flag & P_TRACED) != 0;
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#else
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being_debugged = (info.kp_proc.p_flag & P_TRACED) != 0;
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#endif
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return being_debugged;
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}
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#elif defined(OS_LINUX) || defined(OS_ANDROID) || defined(OS_AIX)
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// We can look in /proc/self/status for TracerPid. We are likely used in crash
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// handling, so we are careful not to use the heap or have side effects.
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// Another option that is common is to try to ptrace yourself, but then we
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// can't detach without forking(), and that's not so great.
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// static
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bool BeingDebugged() {
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// NOTE: This code MUST be async-signal safe (it's used by in-process
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// stack dumping signal handler). NO malloc or stdio is allowed here.
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int status_fd = open("/proc/self/status", O_RDONLY);
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if (status_fd == -1)
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return false;
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// We assume our line will be in the first 1024 characters and that we can
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// read this much all at once. In practice this will generally be true.
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// This simplifies and speeds up things considerably.
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char buf[1024];
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ssize_t num_read = HANDLE_EINTR(read(status_fd, buf, sizeof(buf)));
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if (IGNORE_EINTR(close(status_fd)) < 0)
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return false;
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if (num_read <= 0)
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return false;
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StringPiece status(buf, num_read);
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StringPiece tracer("TracerPid:\t");
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StringPiece::size_type pid_index = status.find(tracer);
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if (pid_index == StringPiece::npos)
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return false;
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// Our pid is 0 without a debugger, assume this for any pid starting with 0.
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pid_index += tracer.size();
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return pid_index < status.size() && status[pid_index] != '0';
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}
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#elif defined(OS_FUCHSIA)
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bool BeingDebugged() {
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// TODO(fuchsia): No gdb/gdbserver in the SDK yet.
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return false;
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}
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#else
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bool BeingDebugged() {
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NOTIMPLEMENTED();
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return false;
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}
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#endif
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// We want to break into the debugger in Debug mode, and cause a crash dump in
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// Release mode. Breakpad behaves as follows:
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//
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// +-------+-----------------+-----------------+
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// | OS | Dump on SIGTRAP | Dump on SIGABRT |
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// +-------+-----------------+-----------------+
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// | Linux | N | Y |
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// | Mac | Y | N |
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// +-------+-----------------+-----------------+
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//
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// Thus we do the following:
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// Linux: Debug mode if a debugger is attached, send SIGTRAP; otherwise send
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// SIGABRT
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// Mac: Always send SIGTRAP.
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#if defined(ARCH_CPU_ARMEL)
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#define DEBUG_BREAK_ASM() asm("bkpt 0")
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#elif defined(ARCH_CPU_ARM64)
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#define DEBUG_BREAK_ASM() asm("brk 0")
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#elif defined(ARCH_CPU_MIPS_FAMILY)
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#define DEBUG_BREAK_ASM() asm("break 2")
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#elif defined(ARCH_CPU_X86_FAMILY)
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#define DEBUG_BREAK_ASM() asm("int3")
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#endif
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#if defined(NDEBUG) && !defined(OS_MACOSX) && !defined(OS_ANDROID)
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#define DEBUG_BREAK() abort()
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#elif defined(OS_NACL)
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// The NaCl verifier doesn't let use use int3. For now, we call abort(). We
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// should ask for advice from some NaCl experts about the optimum thing here.
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// http://code.google.com/p/nativeclient/issues/detail?id=645
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#define DEBUG_BREAK() abort()
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#elif !defined(OS_MACOSX)
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// Though Android has a "helpful" process called debuggerd to catch native
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// signals on the general assumption that they are fatal errors. If no debugger
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// is attached, we call abort since Breakpad needs SIGABRT to create a dump.
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// When debugger is attached, for ARM platform the bkpt instruction appears
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// to cause SIGBUS which is trapped by debuggerd, and we've had great
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// difficulty continuing in a debugger once we stop from SIG triggered by native
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// code, use GDB to set |go| to 1 to resume execution; for X86 platform, use
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// "int3" to setup breakpiont and raise SIGTRAP.
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//
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// On other POSIX architectures, except Mac OS X, we use the same logic to
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// ensure that breakpad creates a dump on crashes while it is still possible to
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// use a debugger.
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namespace {
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void DebugBreak() {
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if (!BeingDebugged()) {
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abort();
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} else {
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#if defined(DEBUG_BREAK_ASM)
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DEBUG_BREAK_ASM();
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#else
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volatile int go = 0;
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while (!go) {
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base::PlatformThread::Sleep(base::TimeDelta::FromMilliseconds(100));
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}
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#endif
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}
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}
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} // namespace
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#define DEBUG_BREAK() DebugBreak()
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#elif defined(DEBUG_BREAK_ASM)
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#define DEBUG_BREAK() DEBUG_BREAK_ASM()
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#else
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#error "Don't know how to debug break on this architecture/OS"
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#endif
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void BreakDebugger() {
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#if defined(CLANG_COVERAGE)
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WriteClangCoverageProfile();
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#endif
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// NOTE: This code MUST be async-signal safe (it's used by in-process
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// stack dumping signal handler). NO malloc or stdio is allowed here.
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// Linker's ICF feature may merge this function with other functions with the
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// same definition (e.g. any function whose sole job is to call abort()) and
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// it may confuse the crash report processing system. http://crbug.com/508489
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static int static_variable_to_make_this_function_unique = 0;
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base::debug::Alias(&static_variable_to_make_this_function_unique);
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DEBUG_BREAK();
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#if defined(OS_ANDROID) && !defined(OFFICIAL_BUILD)
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// For Android development we always build release (debug builds are
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// unmanageably large), so the unofficial build is used for debugging. It is
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// helpful to be able to insert BreakDebugger() statements in the source,
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// attach the debugger, inspect the state of the program and then resume it by
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// setting the 'go' variable above.
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#elif defined(NDEBUG)
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// Terminate the program after signaling the debug break.
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_exit(1);
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#endif
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}
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} // namespace debug
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} // namespace base
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