today's leftovers
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Linux 5.3 Could Finally See FSGSBASE - Performance Improvements Back To Ivybridge
The FSGSBASE instruction set has been present on Intel processors going back to Ivy Bridge processors and while there have been Linux kernel patches for this feature going on for years, it looks like with the Linux 5.3 kernel cycle is this support for merging. Making us eager for this support is the prospect of better performance, especially for context switching workloads that already have been suffering as a result of recent CPU mitigations.
The FSGSBASE instructions allow for reading/writing FS/GS BASE from any privilege. But the short story is there should be performance benefits from FSGSBASE in context switching thanks to skipping an MSR write for GSBASE. User-space programs like Java are also expected to benefit in being able to avoid system calls for editing the FS/GS BASE.
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Security updates for Monday
Security updates have been issued by Arch Linux (chromium and thunderbird), Debian (php-horde-form, pyxdg, thunderbird, and znc), Fedora (containernetworking-plugins, mediawiki, and podman), openSUSE (chromium), Red Hat (bind, chromium-browser, and flash-plugin), SUSE (docker, glibc, gstreamer-0_10-plugins-base, gstreamer-plugins-base, postgresql10, sqlite3, and thunderbird), and Ubuntu (firefox).
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Self-Audits | Roadmap to Securing Your Infrastructure
As you can see, the security audit can be tailored based on any security controls you have/need. NIST provides the 800-53A (“A” is for audit or assessment) and provides different file formats to use. This is a great place to start creating your own audit document.
To sum it up, embracing self-audits and the benefit they provide will reduce risk and save time. The longer a security control remains in a failed state, the more time threats have to exploit a vulnerability. Protect yourself and add security by prioritizing audits.
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