fix: MessageQueueShm head index boundary check

CMakeLists.txt

@@ -237,6 +237,8 @@ set(
   src/response_sender.h
   src/pb_stub.h
   src/pb_stub.cc
+  src/pb_stub_log.h
+  src/pb_stub_log.cc
   src/pb_response_iterator.h
   src/pb_response_iterator.cc
   src/pb_cancel.cc

src/message_queue.h

@@ -1,4 +1,4 @@
-// Copyright 2021-2022, NVIDIA CORPORATION & AFFILIATES. All rights reserved.
+// Copyright 2021-2025, NVIDIA CORPORATION & AFFILIATES. All rights reserved.
 //
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions
@@ -32,14 +32,19 @@
 #include <boost/thread/thread_time.hpp>
 #include <cstddef>
 
+#include "pb_utils.h"
 #include "shm_manager.h"
+#ifdef TRITON_PB_STUB
+#include "pb_stub_log.h"
+#endif
 
 namespace triton { namespace backend { namespace python {
 namespace bi = boost::interprocess;
 
 /// Struct holding the representation of a message queue inside the shared
 /// memory.
-/// \param size Total size of the message queue.
+/// \param size Total size of the message queue. Considered invalid after
+/// MessageQueue::LoadFromSharedMemory. Check DLIS-8378 for additional details.
 /// \param mutex Handle of the mutex variable protecting index.
 /// \param index Used element index.
 /// \param sem_empty Semaphore object counting the number of empty buffer slots.
@@ -110,7 +115,22 @@ class MessageQueue {
 
     {
       bi::scoped_lock<bi::interprocess_mutex> lock{*MutexMutable()};
-      Buffer()[Head()] = message;
+      int head_idx = Head();
+      // Additional check to avoid out of bounds read/write. Check DLIS-8378 for
+      // additional details.
+      if (head_idx < 0 || static_cast<uint32_t>(head_idx) >= Size()) {
+        std::string error_msg =
+            "internal error: message queue head index out of bounds. Expects "
+            "positive integer less than the size of message queue " +
+            std::to_string(Size()) + " but got " + std::to_string(head_idx);
+#ifdef TRITON_PB_STUB
+        LOG_ERROR << error_msg;
+#else
+        LOG_MESSAGE(TRITONSERVER_LOG_ERROR, error_msg.c_str());
+#endif
+        return;
+      }
+      Buffer()[head_idx] = message;
       HeadIncrement();
     }
     SemFullMutable()->post();
@@ -145,7 +165,22 @@ class MessageQueue {
       }
       success = true;
 
-      Buffer()[Head()] = message;
+      int head_idx = Head();
+      // Additional check to avoid out of bounds read/write. Check DLIS-8378 for
+      // additional details.
+      if (head_idx < 0 || static_cast<uint32_t>(head_idx) >= Size()) {
+        std::string error_msg =
+            "internal error: message queue head index out of bounds. Expects "
+            "positive integer less than the size of message queue " +
+            std::to_string(Size()) + " but got " + std::to_string(head_idx);
+#ifdef TRITON_PB_STUB
+        LOG_ERROR << error_msg;
+#else
+        LOG_MESSAGE(TRITONSERVER_LOG_ERROR, error_msg.c_str());
+#endif
+        return;
+      }
+      Buffer()[head_idx] = message;
       HeadIncrement();
     }
     SemFullMutable()->post();
@@ -244,7 +279,7 @@ class MessageQueue {
   }
 
  private:
-  std::size_t& Size() { return mq_shm_ptr_->size; }
+  uint32_t Size() { return size_; }
   const bi::interprocess_mutex& Mutex() { return mq_shm_ptr_->mutex; }
   bi::interprocess_mutex* MutexMutable() { return &(mq_shm_ptr_->mutex); }
   int& Head() { return mq_shm_ptr_->head; }
@@ -273,6 +308,7 @@ class MessageQueue {
   MessageQueueShm* mq_shm_ptr_;
   T* mq_buffer_shm_ptr_;
   bi::managed_external_buffer::handle_t mq_handle_;
+  uint32_t size_;
 
   /// Create/load a Message queue.
   /// \param mq_shm Message queue representation in shared memory.
@@ -284,6 +320,7 @@ class MessageQueue {
     mq_buffer_shm_ptr_ = mq_buffer_shm_.data_.get();
     mq_shm_ptr_ = mq_shm_.data_.get();
     mq_handle_ = mq_shm_.handle_;
+    size_ = mq_shm_ptr_->size;
   }
 };
 }}}  // namespace triton::backend::python

src/pb_bls_cancel.cc

@@ -27,6 +27,7 @@
 #include "pb_bls_cancel.h"
 
 #include "pb_stub.h"
+#include "pb_stub_log.h"
 
 namespace triton { namespace backend { namespace python {
 

src/pb_cancel.cc

@@ -1,4 +1,4 @@
-// Copyright 2023-2024, NVIDIA CORPORATION & AFFILIATES. All rights reserved.
+// Copyright 2023-2025, NVIDIA CORPORATION & AFFILIATES. All rights reserved.
 //
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions
@@ -27,6 +27,7 @@
 #include "pb_cancel.h"
 
 #include "pb_stub.h"
+#include "pb_stub_log.h"
 
 namespace triton { namespace backend { namespace python {
 

src/pb_stub.cc

@@ -49,6 +49,7 @@
 #include "pb_preferred_memory.h"
 #include "pb_response_iterator.h"
 #include "pb_string.h"
+#include "pb_stub_log.h"
 #include "pb_utils.h"
 #include "response_sender.h"
 #include "scoped_defer.h"
@@ -1569,138 +1570,6 @@ Stub::ProcessBLSResponseDecoupled(std::unique_ptr<IPCMessage>& ipc_message)
   }
 }
 
-std::unique_ptr<Logger> Logger::log_instance_;
-
-std::unique_ptr<Logger>&
-Logger::GetOrCreateInstance()
-{
-  if (Logger::log_instance_.get() == nullptr) {
-    Logger::log_instance_ = std::make_unique<Logger>();
-  }
-
-  return Logger::log_instance_;
-}
-
-// Bound function, called from the python client
-void
-Logger::Log(const std::string& message, LogLevel level)
-{
-  std::unique_ptr<Stub>& stub = Stub::GetOrCreateInstance();
-  py::object frame = py::module_::import("inspect").attr("currentframe");
-  py::object caller_frame = frame();
-  py::object info = py::module_::import("inspect").attr("getframeinfo");
-  py::object caller_info = info(caller_frame);
-  py::object filename_python = caller_info.attr("filename");
-  std::string filename = filename_python.cast<std::string>();
-  py::object lineno = caller_info.attr("lineno");
-  uint32_t line = lineno.cast<uint32_t>();
-
-  if (!stub->StubToParentServiceActive()) {
-    Logger::GetOrCreateInstance()->Log(filename, line, level, message);
-  } else {
-    std::unique_ptr<PbLog> log_msg(new PbLog(filename, line, message, level));
-    stub->EnqueueLogRequest(log_msg);
-  }
-}
-
-// Called internally (.e.g. LOG_ERROR << "Error"; )
-void
-Logger::Log(
-    const std::string& filename, uint32_t lineno, LogLevel level,
-    const std::string& message)
-{
-  // If the log monitor service is not active yet, format
-  // and pass messages to cerr
-  if (!BackendLoggingActive()) {
-    std::string path(filename);
-    size_t pos = path.rfind(std::filesystem::path::preferred_separator);
-    if (pos != std::string::npos) {
-      path = path.substr(pos + 1, std::string::npos);
-    }
-#ifdef _WIN32
-    std::stringstream ss;
-    SYSTEMTIME system_time;
-    GetSystemTime(&system_time);
-    ss << LeadingLogChar(level) << std::setfill('0') << std::setw(2)
-       << system_time.wMonth << std::setw(2) << system_time.wDay << ' '
-       << std::setw(2) << system_time.wHour << ':' << std::setw(2)
-       << system_time.wMinute << ':' << std::setw(2) << system_time.wSecond
-       << '.' << std::setw(6) << system_time.wMilliseconds * 1000 << ' '
-       << static_cast<uint32_t>(GetCurrentProcessId()) << ' ' << path << ':'
-       << lineno << "] ";
-#else
-    std::stringstream ss;
-    struct timeval tv;
-    gettimeofday(&tv, NULL);
-    struct tm tm_time;
-    gmtime_r(((time_t*)&(tv.tv_sec)), &tm_time);
-    ss << LeadingLogChar(level) << std::setfill('0') << std::setw(2)
-       << (tm_time.tm_mon + 1) << std::setw(2) << tm_time.tm_mday << " "
-       << std::setw(2) << tm_time.tm_hour << ':' << std::setw(2)
-       << tm_time.tm_min << ':' << std::setw(2) << tm_time.tm_sec << "."
-       << std::setw(6) << tv.tv_usec << ' ' << static_cast<uint32_t>(getpid())
-       << ' ' << path << ':' << lineno << "] ";
-    std::cerr << ss.str() << " " << message << std::endl;
-#endif
-  } else {
-    // Ensure we do not create a stub instance before it has initialized
-    std::unique_ptr<Stub>& stub = Stub::GetOrCreateInstance();
-    std::unique_ptr<PbLog> log_msg(new PbLog(filename, lineno, message, level));
-    stub->EnqueueLogRequest(log_msg);
-  }
-}
-
-void
-Logger::LogInfo(const std::string& message)
-{
-  Logger::Log(message, LogLevel::kInfo);
-}
-
-void
-Logger::LogWarn(const std::string& message)
-{
-  Logger::Log(message, LogLevel::kWarning);
-}
-
-void
-Logger::LogError(const std::string& message)
-{
-  Logger::Log(message, LogLevel::kError);
-}
-
-void
-Logger::LogVerbose(const std::string& message)
-{
-  Logger::Log(message, LogLevel::kVerbose);
-}
-
-const std::string
-Logger::LeadingLogChar(const LogLevel& level)
-{
-  switch (level) {
-    case LogLevel::kWarning:
-      return "W";
-    case LogLevel::kError:
-      return "E";
-    case LogLevel::kInfo:
-    case LogLevel::kVerbose:
-    default:
-      return "I";
-  }
-}
-
-void
-Logger::SetBackendLoggingActive(bool status)
-{
-  backend_logging_active_ = status;
-}
-
-bool
-Logger::BackendLoggingActive()
-{
-  return backend_logging_active_;
-}
-
 PYBIND11_EMBEDDED_MODULE(c_python_backend_utils, module)
 {
   py::class_<PbError, std::shared_ptr<PbError>> triton_error(