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Old 03-01-18, 09:43 AM
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Initial benchmarks for Linux's performance impacting security update are out

Both Intel and AMD x86 products are affected at the time of writing.



Read more about the performance impact of the Linux Kernel's Intel bug-fixing update.

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Old 03-01-18, 09:44 AM
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Quote:
Originally Posted by WYP View Post
Both Intel and AMD x86 products are affected at the time of writing.
AMD are on it
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Old 03-01-18, 10:07 AM
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TheF34RChannel TheF34RChannel is offline
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Ah, so AMD wasn't uncorking champagne then...
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Old 03-01-18, 10:18 AM
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Originally Posted by TheF34RChannel View Post
Ah, so AMD wasn't uncorking champagne then...
They will be as soon as their "unpatch the indiscriminate patch" goes live
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Old 03-01-18, 10:51 AM
wozza365 wozza365 is offline
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Originally Posted by TheF34RChannel View Post
Ah, so AMD wasn't uncorking champagne then...
The patch is only going to affect AMD temporarily, it's going to affect pretty much all Intel CPUs permanently until they release new hardware.
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Old 03-01-18, 11:31 AM
Gothmoth Gothmoth is offline
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it is most likely that developers are taking the "better safe than sorry" approach to security. AMD should be able to demonstrate that their products are unaffected by the bug and should be able to get the kernel patched with exceptions in the near future, leaving this mess solely at Intel's feet.
they (at least microsoft) work on this patch since october.

they should be able to confirm if AMD is affected or not...
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Old 03-01-18, 01:21 PM
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Linux are just being cautious with the inclusion of ALL x86 processors being tagged as insecure. We all know the flaw in Intels and there are yet to be any confirmation that AMD is affected. Still I think it is right to err on the side of caution just in case
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Old 03-01-18, 01:22 PM
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Quote:
Originally Posted by wozza365 View Post
The patch is only going to affect AMD temporarily, it's going to affect pretty much all Intel CPUs permanently until they release new hardware.
new patch arrived already here it is:
https://patchwork.kernel.org/patch/10133447/
hopefully the OP can update the article
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Old 03-01-18, 02:36 PM
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Originally Posted by cj09bruno View Post
new patch arrived already here it is:
https://patchwork.kernel.org/patch/10133447/
hopefully the OP can update the article
I have updated the article to link the patch and the known workaround. The problem is that the patch doesn't seem to be merged with the mainline Kernel.

Latest patch notes:
https://cdn.kernel.org/pub/linux/ker...ngeLog-4.14.11

Quote:
Many x86 CPUs leak information to user space due to missing isolation of
user space and kernel space page tables. There are many well documented
ways to exploit that.

The upcoming software migitation of isolating the user and kernel space
page tables needs a misfeature flag so code can be made runtime
conditional.

Add the BUG bits which indicates that the CPU is affected and add a feature
bit which indicates that the software migitation is enabled.

Assume for now that _ALL_ x86 CPUs are affected by this. Exceptions can be
made later.
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Old 03-01-18, 02:57 PM
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With a drop in performance of up to 30% for Intel CPUs, that's going to make AMD even more attractive, and in some cases a complete no brainer.
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