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 Benchmarking Platform
Phoromatic Test Orchestration

Intel SMAP Comes To Try To Better Secure Linux

Intel

Published on 02 October 2012 10:40 AM EDT
Written by Michael Larabel in Intel
11 Comments

Intel SMAP support has landed in the mainline Linux kernel, which is a Supervisor Mode Access Prevention found on newer Intel CPUs.

The Supervisor Mode Access Prevention feature is an instruction set extension whereby the kernel cannot access pages that are user-space. However, when the need comes about for the kernel to access a user-space page, an override is available. This work from Intel was originally published last month and has now been merged into the mainline kernel for Linux 3.7.

Basically SMAP comes down to a hardware feature preventing unintended user-space data access from kernel code. SMAP works alongside SMEP (Supervisor Mode Execution Protection) to try to prevent kernel bugs from being exploited. Intel SMAP is turned on by default for supported hardware. The kernel config option for SMAP does mention though, "There is a small performance cost if this enabled and turned on; there is also a small increase in the kernel size if this is enabled."

The merge of SMAP for Linux 3.7 happened with this commit.

About The Author
Michael Larabel is the principal author of Phoronix.com and founded the web-site in 2004 with a focus on enriching the Linux hardware experience and being the largest web-site devoted to Linux hardware reviews, particularly for products relevant to Linux gamers and enthusiasts but also commonly reviewing servers/workstations and embedded Linux devices. Michael has written more than 10,000 articles covering the state of Linux hardware support, Linux performance, graphics hardware drivers, and other topics. Michael is also the lead developer of the Phoronix Test Suite, Phoromatic, and OpenBenchmarking.org automated testing software. He can be followed via and or contacted via .
Latest Linux News
  1. Phoronix Test Suite 5.8 Milestone 5 Brings Near Final "Belev" Experience
  2. For AMD Users, Linux 4.2 Will Bring The New AMDGPU Driver & VCE1 For Radeon
  3. Atomic Mode-Setting Still Baking For Samsung's Exynos DRM Driver
  4. Ubuntu Phone Update This Month Brings Many Improvements
  5. Fedora's "Fedup" To Be Replaced In Fedora 23
  6. Android M Should Bring Greater Performance & Efficiency
  7. AMD Teases Upcoming Radeon "Fiji" GPU Launch
  8. Dell Makes An Ubuntu Installation Guide, Suggests Users Try It Out
  9. Running Linux On The Intel Compute Stick
  10. AMD Launches The A10-7870K "Godavari" APU
Latest Articles & Reviews
  1. Opening The Gates To Our Daily Open-Source Linux Benchmark Results
  2. The Latest Features For Linux Performance Management + Benchmark Monitoring
  3. Noctua NH-U12DX i4 + NF-F12
  4. Btrfs RAID 0/1 Benchmarks On The Linux 4.1 Kernel
Most Viewed News This Week
  1. NVIDIA's Proprietary Driver Is Moving Closer With Kernel Mode-Setting
  2. Zapcc Claims To Be A "Much Faster C++ Compiler"
  3. OpenWRT 15.05 Preparing Improved Security & Better Networking
  4. Features Added To Mesa 10.6 For Open-Source GPU Drivers
  5. Ubuntu's LXD vs. KVM For The Linux Cloud
  6. The Latest Linux Kernel Git Code Fixes The EXT4 RAID0 Corruption Problem
  7. Fedora 22 Is Being Released Next Tuesday
  8. Friction Building Around An Ubuntu Community Council Decision