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83ab62e2bb
Summary: LogBuffer::AddLogToBuffer() uses vsnprintf() in the wrong way, which might cause buffer overflow when log line is too line. Fix it. Test Plan: Add a unit test to cover most LogBuffer's most logic. Reviewers: igor, haobo, dhruba Reviewed By: igor CC: ljin, yhchiang, leveldb Differential Revision: https://reviews.facebook.net/D17103
74 lines
2 KiB
C++
74 lines
2 KiB
C++
// Copyright (c) 2014, Facebook, Inc. All rights reserved.
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// This source code is licensed under the BSD-style license found in the
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// LICENSE file in the root directory of this source tree. An additional grant
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// of patent rights can be found in the PATENTS file in the same directory.
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#include "util/log_buffer.h"
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#include <sys/time.h>
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namespace rocksdb {
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LogBuffer::LogBuffer(const InfoLogLevel log_level,
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Logger*info_log)
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: log_level_(log_level), info_log_(info_log) {}
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void LogBuffer::AddLogToBuffer(const char* format, va_list ap) {
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if (!info_log_ || log_level_ < info_log_->GetInfoLogLevel()) {
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// Skip the level because of its level.
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return;
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}
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const size_t kLogSizeLimit = 512;
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char* alloc_mem = arena_.AllocateAligned(kLogSizeLimit);
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BufferedLog* buffered_log = new (alloc_mem) BufferedLog();
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char* p = buffered_log->message;
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char* limit = alloc_mem + kLogSizeLimit - 1;
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// store the time
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gettimeofday(&(buffered_log->now_tv), nullptr);
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// Print the message
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if (p < limit) {
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va_list backup_ap;
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va_copy(backup_ap, ap);
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auto n = vsnprintf(p, limit - p, format, backup_ap);
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assert(n >= 0);
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p += n;
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va_end(backup_ap);
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}
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if (p > limit) {
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p = limit;
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}
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// Add '\0' to the end
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*p = '\0';
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logs_.push_back(buffered_log);
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}
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void LogBuffer::FlushBufferToLog() {
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for (BufferedLog* log : logs_) {
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const time_t seconds = log->now_tv.tv_sec;
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struct tm t;
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localtime_r(&seconds, &t);
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Log(log_level_, info_log_,
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"(Original Log Time %04d/%02d/%02d-%02d:%02d:%02d.%06d) %s",
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t.tm_year + 1900, t.tm_mon + 1, t.tm_mday, t.tm_hour, t.tm_min,
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t.tm_sec, static_cast<int>(log->now_tv.tv_usec), log->message);
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}
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logs_.clear();
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}
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void LogToBuffer(LogBuffer* log_buffer, const char* format, ...) {
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if (log_buffer != nullptr) {
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va_list ap;
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va_start(ap, format);
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log_buffer->AddLogToBuffer(format, ap);
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va_end(ap);
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}
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}
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} // namespace rocksdb
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