[Phoronix] Intel's Mitigation For CVE-2019-14615 Graphics Vulnerability Obliterates Gen7 iGPU Performance - Overclock.net - An Overclocking Community
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[Phoronix] Intel's Mitigation For CVE-2019-14615 Graphics Vulnerability Obliterates Gen7 iGPU Performance

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post #1 of 36 (permalink) Old 01-15-2020, 05:53 PM - Thread Starter
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[Phoronix] Intel's Mitigation For CVE-2019-14615 Graphics Vulnerability Obliterates Gen7 iGPU Performance

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Yesterday we noted that the Linux kernel picked up a patch mitigating an Intel Gen9 graphics vulnerability. It didn't sound too bad at first but then seeing Ivy Bridge Gen7 and Haswell Gen7.5 graphics are also affected raised eyebrows especially with that requiring a much larger mitigation. Now in testing the performance impact, the current mitigation patches completely wreck the performance of Ivybridge/Haswell graphics performance.

The CVE-2019-14615 vulnerability amounts to a new information disclosure issue due to insufficient control flow in certain data structures. Local access is required for exploiting this control flow issue in the hardware, but it's not yet known/published if say WebGL within web browsers could exploit this issue. This is a hardware issue with all operating systems being affected. Our testing today, of course, is under Linux.

With the Intel Gen9 graphics mitigation it's resorting to clearing all execution unit (EU) state at each context switch. That patch was merged to mainline right away and quickly backported to the stable series seeing new point releases. All is fairly well there (including minimal performance impact, as to be shown in this article) but with the Gen7/Gen7.5 mitigation is where the situation becomes quite messy.
https://www.phoronix.com/scan.php?pa...gen7-hit&num=1

Oh Intel...

#EnthusiastLivesMatter

Last edited by Imouto; 01-15-2020 at 06:03 PM.
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post #2 of 36 (permalink) Old 01-15-2020, 06:22 PM
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Ouch.

If the impact is similar in Windows, Intel are really going to need to get their new GPU out the door quickly.

I foresee a lot of unhappy punters who bought cheap-as-chips Dells with Intel Integrated...


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post #3 of 36 (permalink) Old 01-15-2020, 06:24 PM
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post #4 of 36 (permalink) Old 01-15-2020, 06:28 PM
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Hi,
Who is using onboard graphic's now days ?
Besides maybe a cheap laptop.

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post #5 of 36 (permalink) Old 01-15-2020, 06:38 PM
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Quote: Originally Posted by ThrashZone View Post
Hi,
Who is using onboard graphic's now days ?
Besides maybe a cheap laptop.
my first thought is how this would affect the corporate space. CSCs gonna be on fire tomorrow all across the country as systems 3-18 months behind get dragged up to date by halfwit infrastructure teams puckering while the top brass & 3rd parties spam them with threat assessment

my email, and team, right now

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post #6 of 36 (permalink) Old 01-15-2020, 06:40 PM - Thread Starter
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Quote: Originally Posted by ThrashZone View Post
Hi,
Who is using onboard graphic's now days ?
Besides maybe a cheap laptop.
Every single Intel + Nvidia laptop. iGPU for everyday tasks and dGPU for demanding ones. Nvidia Optimus.

#EnthusiastLivesMatter
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post #7 of 36 (permalink) Old 01-15-2020, 07:51 PM
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Quote: Originally Posted by ThrashZone View Post
Hi,
Who is using onboard graphic's now days ?
Besides maybe a cheap laptop.
Anyone with an Intel CPU with their iGPU is potentially at risk, I think? Windows 10 will install the Intel GPU driver regardless of whether or not I'm using a dGPU. The desktop board I had for testing had such a terrible BIOS (minimal options) it was embarrassing. If selecting "PCI-E GPU" totally disabled the Intel iGPU, you might be OK? If not... I dunno.

I'll need to get that box back and do some tests.

Perhaps that is a (post fact) justification for why Intel CPUs with no iGPU were/are more expensive - less vulnerabilities!

Quote: Originally Posted by skupples View Post
my first thought is how this would affect the corporate space. CSCs gonna be on fire tomorrow all across the country as systems 3-18 months behind get dragged up to date by halfwit infrastructure teams puckering while the top brass & 3rd parties spam them with threat assessment

my email, and team, right now
Oh yeah, it's really going to hurt all the corporate cheapest-possible-box-in-each-cubicle scenarios...

Quote: Originally Posted by Imouto View Post
Every single Intel + Nvidia laptop. iGPU for everyday tasks and dGPU for demanding ones. Nvidia Optimus.
Yup.


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post #8 of 36 (permalink) Old 01-15-2020, 08:23 PM
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Looks like mostly just Haswell igpus that get their gaming and 2d java rendering hurt. Not enough to make Netflix stutter, unless maybe you are using a 2013-2014 bay trail atom. Cherry trail atoms are fine, they're gen 8.

I have one of those bay trail atoms in a tablet. Maybe my daughter will complain if her Minecraft gets slow. Not going to bother me, I'll tell her to watch her youtube on that and leave the gaming for her Haswell desktop.
But my office pc that I actually mitigate and even has Malwarebytes on it has the king of gen 7.5: the iris 5200 igpu in a 4980hq. But I don't game on it so still don't care. Maybe some with old 2014 MacBook pros with that same chip are going to have their gaming impacted if Apple even updates such old stuff idk.

As for laptops with combo intel/NVidia graphics, the intel part will still be more than fast enough for web browsing and media playback and you will only notice if you choose the "Integrated graphics" option in the NVidia control panel for gaming. Default is "Auto-select" I.E. igpu for light and dgpu for 3d.

Quick Sync on Haswell might be slower. I really stopped transcoding back when my internet got fast enough to stream video though. I'm sure some people still do it to save storage space? Maybe watch the same thing over and over and save on data? Or to stay disconnected from the internet? Maybe there is some reason if you upload a lot to youtube?

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post #9 of 36 (permalink) Old 01-15-2020, 08:48 PM
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Quote: Originally Posted by Paradigm Shifter View Post
Anyone with an Intel CPU with their iGPU is potentially at risk, I think? Windows 10 will install the Intel GPU driver regardless of whether or not I'm using a dGPU. The desktop board I had for testing had such a terrible BIOS (minimal options) it was embarrassing. If selecting "PCI-E GPU" totally disabled the Intel iGPU, you might be OK? If not... I dunno.

I'll need to get that box back and do some tests.

Perhaps that is a (post fact) justification for why Intel CPUs with no iGPU were/are more expensive - less vulnerabilities!


Oh yeah, it's really going to hurt all the corporate cheapest-possible-box-in-each-cubicle scenarios...


Yup.
If my igpu is disabled in bios, it doesn't show up in the device manager, so I don't think windows can access it. If I enable it in bios, it shows up in device manager, but without the display hooked up to it the Intel graphics options aren't available. MSI AB sees it and can measure it's constant 0% use. Which makes sense since it doesn't make the signal for my dgpu. So you could use that to check.
This article was about the performance penalty from a vulnerability after it has been mitigated. Another exploit that has olny been found to work if you have local access and administrative privileges. The author says maybe someday somebody might be able to do it remotely. That author should probably worry more about the remote possibility that hackers develop plasmids to get telekinesis and quietly slip the dollars from his wallet and out the window

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Last edited by rluker5; 01-15-2020 at 09:12 PM.
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post #10 of 36 (permalink) Old 01-15-2020, 09:13 PM
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Pretty unfortunate for anyone impacted but Haswell.. 2013. If you are still using this cpu + iGPU its probably time for a upgrade

Even from a corporate standpoint, oldest laptops where I work have skylake chips (2015)
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