1. Computers
  2. Display Drivers
  3. Graphics Cards
  4. Memory
  5. Motherboards
  6. Processors
  7. Software
  8. Storage
  9. Operating Systems


Facebook RSS Twitter Twitter Google Plus


Phoronix Test Suite

OpenBenchmarking.org

Improved Memory Security For Radeon DRM

AMD

Published on 18 June 2009 01:29 PM EDT
Written by Michael Larabel in AMD
27 Comments

Yesterday the TTM memory manager and Radeon kernel mode-setting code entered the mainline Linux kernel Git tree, which means it will be part of the next Linux 2.6.31 kernel release. In the 2.6.31 series this new Radeon driver will be marked as "staging" as there is still some work left to be accomplished and further testing needs to be done with this driver and different Radeon graphics cards. One of the items that had not been addressed in this initial code push was much in the way of security, however, already that has partially changed.

Jerome Glisse, who has long been involved with the development of open-source ATI X.Org drivers and was the original developer behind the short-lived xf86-video-avivo driver, has submitted a command stream state checker for the Radeon DRM code. With the ATI GPU memory management being done within the kernel, there must be safeguards in place that prevent user-space processes from exploiting that by accessing system memory beyond its allowed GPU memory objects.

This command stream state checker currently supports the ATI R300, R400, and R500 generations of hardware. This code checks against color buffers, z-buffers, vertex buffers, and textures. Right now this newly-proposed code does not guard against 2D rendering states. With the additional overhead now of having to monitor the GPU's command stream to ensure that no commands are violating their memory rights, there is a performance cost. Jerome mentions that he is currently seeing about a 3% decrease in performance, but further optimization can still be done via caching support.

Jerome's R300-R500 series command state checker is just over 1,000 lines of code long and can be found on the DRI development list.

Latest Linux Hardware Reviews
  1. Mini-Box M350: A Simple, Affordable Mini-ITX Case
  2. Overclocking The AMD AM1 Athlon & Sempron APUs
  3. AMD Athlon 5350 / 5150 & Sempron 3850 / 2650
  4. Upgraded Kernel & Mesa Yield A Big Boost For Athlon R3 Graphics
Latest Linux Articles
  1. A Quick Look At GCC 4.9 vs. LLVM Clang 3.5
  2. Are AMD Athlon/Sempron APUs Fast Enough For Steam On Linux?
  3. AMD Athlon's R3 Graphics: RadeonSI Gallium3D vs. Catalyst
  4. GCC 4.9 Compiler Optimization Benchmarks For Faster Binaries
Latest Linux News
  1. Fedora Workstation Is Making Me Quite Excited
  2. Maynard: A Lightweight Wayland Desktop
  3. Chromium Browser Going Through Growing Pains In Ubuntu 14.04
  4. KDE 4.13 Is Being Released Today With New Features
  5. Trying Out Radeon R9 290 Graphics On Open-Source
  6. Intel Broadwell GT3 Graphics Have Dual BSD Rings
  7. Early Linux 3.15 Benchmarks Of Intel Core i7 + Radeon
  8. Red Hat Releases Its RHEL 7 Release Candidate
  9. New Features Coming To Xubuntu 14.04 LTS
  10. NVIDIA Officially Releases CUDA 6
  11. Google Releases An AutoFDO Converter For Perf In LLVM
  12. Fedora 21 To Evaluate Remote Journal Logging, 64-bit ARM Emulation
Latest Forum Discussions
  1. The GNOME Foundation Is Running Short On Money
  2. Change installation destination from home directory
  3. After Jack Keane, RuseSoft will briing Ankh 3 to Linux through Desura
  4. Linux Kernel Developers Fed Up With Ridiculous Bugs In Systemd
  5. Bye bye BSD, Hello Linux: A Sys Admin's Story
  6. New tool for undervolt/overclock AMD K8L and K10 processors
  7. How to enable opengl 3.3 on r9 270?
  8. R290x sound problems