Kernel: Linux 4.19 and Security Aspects
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Some Of The Smaller Features Hitting The Linux 4.19 Kernel This Week
Here is a look at some of the smaller features landing in the Linux 4.19 kernel this week in a variety of different subsystems.
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Linux Kernel Diverts Question To Distros: Trust CPU Hardware Random Number Generators?
In a controversial move, the Linux kernel will be pushing the question off to distribution vendors on whether to put trust in CPU hardware random number generators.
Google's Ted Ts'o sent out the random subsystem updates this week for the Linux 4.19 kernel merge window. In addition to the recent change of better protecting entropy sent in from user-space, the decision on whether to trust the CPU hardware random number generators like Intel's RdRand will now be left up to the Linux distribution vendors or end-users having the final say in overriding that decision.
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L1TF / Foreshadow Mitigations Land In Linux 4.18 / 4.17 / 4.14 / 4.9 / 4.4 Kernel Update
Linux stable maintainer Greg Kroah-Hartman has released new updates across the Linux 4.18, 4.17, 4.14, 4.9, and 4.4 kernel channels to address the recently exposed L1 Terminal Fault "L1TF" / Foreshadow Meltdown-like CPU vulnerability affecting Intel processors.
Linux 4.4.148, 4.9.120, 4.14.63, 4.17.15, and 4.18.1 are all out this morning with their principal changes in these patch releases being the inclusion of L1TF/Foreshadow mitigation. As covered already, the default behavior is to carry out conditional L1D flushes on VMENTER, but there are kernel knobs available for always forcing L1 cache flushes on VMENTER and the full protection of disabling SMP/HT support.
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Linux 4.19 Goes Ahead And Makes Lazy TLB Mode Lazier For Small Performance Benefit
Last month I wrote about lazy TLB mode improvements on the way to the mainline kernel and this week the changes were indeed merged for the in-development Linux 4.19 kernel.
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