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// Copyright 2017 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "sandbox/mac/sandbox_logging.h"
#include <errno.h>
#include <os/log.h>
#include <stdarg.h>
#include <stdio.h>
#include <string.h>
#include <syslog.h>
#include <unistd.h>
#include <limits>
#include <string>
#include "build/build_config.h"
#include "sandbox/mac/sandbox_crash_message.h"
#if defined(ARCH_CPU_X86_64)
#define ABORT() \
{ \
asm volatile( \
"int3; ud2; push %0;" ::"i"(static_cast<unsigned char>(__COUNTER__))); \
__builtin_unreachable(); \
}
#elif defined(ARCH_CPU_ARM64)
#define ABORT() \
{ \
asm volatile("udf %0;" ::"i"(static_cast<unsigned char>(__COUNTER__))); \
__builtin_unreachable(); \
}
#endif
extern "C" {
void abort_report_np(const char*, ...);
}
namespace sandbox::logging {
namespace {
enum class Level { FATAL, ERR, WARN, INFO };
void SendOsLog(Level level, const char* message) {
const class OSLog {
public:
explicit OSLog()
: os_log_(os_log_create("org.chromium.sandbox", "chromium_logging")) {}
OSLog(const OSLog&) = delete;
OSLog& operator=(const OSLog&) = delete;
~OSLog() { os_release(os_log_); }
os_log_t get() const { return os_log_; }
private:
os_log_t os_log_;
} log;
const os_log_type_t os_log_type = [](Level level) {
switch (level) {
case Level::FATAL:
return OS_LOG_TYPE_FAULT;
case Level::ERR:
return OS_LOG_TYPE_ERROR;
case Level::WARN:
return OS_LOG_TYPE_DEFAULT;
case Level::INFO:
return OS_LOG_TYPE_INFO;
}
}(level);
os_log_with_type(log.get(), os_log_type, "%{public}s", message);
if (level == Level::ERR) {
sandbox::crash_message::SetCrashMessage(message);
}
if (level == Level::FATAL) {
abort_report_np(message);
}
}
// |error| is strerror(errno) when a P* logging function is called. Pass
// |nullptr| if no errno is set.
void DoLogging(Level level,
const char* fmt,
va_list args,
const std::string* error) {
char message[4096];
int ret = vsnprintf(message, sizeof(message), fmt, args);
if (ret < 0) {
SendOsLog(level, "warning: log message could not be formatted");
return;
}
// int |ret| is not negative so casting to a larger type is safe.
bool truncated = static_cast<unsigned long>(ret) > sizeof(message) - 1;
std::string final_message = message;
if (error)
final_message += ": " + *error;
SendOsLog(level, final_message.c_str());
if (truncated) {
SendOsLog(level, "warning: previous log message truncated");
}
}
} // namespace
void Info(const char* fmt, ...) {
va_list args;
va_start(args, fmt);
DoLogging(Level::INFO, fmt, args, nullptr);
va_end(args);
}
void Warning(const char* fmt, ...) {
va_list args;
va_start(args, fmt);
DoLogging(Level::WARN, fmt, args, nullptr);
va_end(args);
}
void Error(const char* fmt, ...) {
va_list args;
va_start(args, fmt);
DoLogging(Level::ERR, fmt, args, nullptr);
va_end(args);
}
void Fatal(const char* fmt, ...) {
va_list args;
va_start(args, fmt);
DoLogging(Level::FATAL, fmt, args, nullptr);
va_end(args);
ABORT();
}
void PError(const char* fmt, ...) {
std::string error = strerror(errno);
va_list args;
va_start(args, fmt);
DoLogging(Level::ERR, fmt, args, &error);
va_end(args);
}
void PFatal(const char* fmt, ...) {
std::string error = strerror(errno);
va_list args;
va_start(args, fmt);
DoLogging(Level::FATAL, fmt, args, &error);
va_end(args);
ABORT();
}
} // namespace sandbox::logging
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