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Intel CPUs have another bug that can leak sensitive information

By Greg S ยท 30 replies
Jun 14, 2018
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  1. After shaking up the community earlier this year, Spectre and Meltdown flaws found in the vast majority of modern processors have changed the normal state of security patches. Now, Intel has disclosed that it is affected by another bug that can leak information between running processes.

    Lazy FP State Restore deals with how floating point numbers are calculated. All Intel Core processors are considered to be affected by this vulnerability. In order to improve performance, a dedicated hardware portion of the CPU handles all floating point calculations and maintains its own set of registers. When switching between tasks, Intel's CPUs save their current execution states and load in a new set of information.

    During this process, the floating point unit state can be ignored since many applications do not need to pause and resume computation of floating point numbers. In what is known as the lazy restore scheme, the FPU issues a Device not Available exception during a task switch. However, the data stored in the FPU registers is able to be determined by other processes when the lazy restore scheme is used.

    In this case, the fix is already possible via regular software updates and thankfully not another problem that requires microcode updates. Simply avoiding the use of lazy FP state restore mitigates the problem. Eager save and restore is a secondary method of accomplishing the same goal but with slightly lower performance.

    For general consumers this vulnerability is unlikely to have any severe impacts, but for enterprise and data centers, this is going to be another painful round of applying patches. Vendors such as RedHat have already begun issues updates to their software to implement eager save and restore operations.

    Permalink to story.

    kgbme likes this.
  2. HardReset

    HardReset TS Guru Posts: 639   +259

    That's another well deserved punishment for those who bought Intel CPU's.
  3. amghwk

    amghwk TS Maniac Posts: 399   +226

    This got nothing to do with Intel or AMD. Hackers have become more advanced, from hacking software to now exploiting the deep core of the functions of the CPU itself.
  4. MoeJoe

    MoeJoe Banned Posts: 837   +441

    LMAO. Ryzen F T W !
    kgbme and Charles Olson like this.
  5. Misagt

    Misagt TS Maniac Posts: 247   +176

    I'm glad my new build that I bought this week is built around the Ryzen 7 2700x
    kgbme and Charles Olson like this.
  6. MoeJoe

    MoeJoe Banned Posts: 837   +441

    So am I. Cross-hair VII Hero with a 2700 has exceeded ALL my expectations.
    And I saved a boat load of cash.

    The Meltdown/Spectre fiasco and now this has me leaving Intel in the dust.
    And the mobo mfg's and their piss-poor support for security updated BIOS roll-outs (especially MSI) forced me to think differently.
    AMD all the way now ...
    Charles Olson likes this.
  7. Lionvibez

    Lionvibez TS Evangelist Posts: 1,424   +589

    Whats missing from this story is that this flaw only affects Sandy bridge and newer.

    As someone that is still on a gulftown processor i7 970 I'm not affected.
  8. pcnthuziast

    pcnthuziast TS Guru Posts: 427   +62

    Intel's the swiss cheese of cpu's these days. So many holes... smfh
    Charles Olson likes this.
  9. HardReset

    HardReset TS Guru Posts: 639   +259

    Fortunately those hacks work better against Intel CPU's.
    penn919, kgbme, Shadowboxer and 2 others like this.
  10. texasrattler

    texasrattler TS Evangelist Posts: 512   +186

    Ive used i7 3rd gen for the last 4 yrs. still not a single issue with any of these security issues that have been announced.
    im not seeing or being affected by any of these. my comp is just the same as before n my games all play fine.
    as far as I can tell most users wont need to worry or even notice anything.
    Shadowboxer likes this.
  11. Evernessince

    Evernessince TS Evangelist Posts: 3,399   +2,673

    If it were hackers that were getting better these issues would affect AMD as well. This isn't a market agnostic issue, it's a Intel dun screwed up issue.

    Exactly the point, you wouldn't be able to tell if you were exploited in the first place. This isn't a virus that makes it obvious, exploits like Spectre and Meltdown can be executed from a remote computer and gain access to your system without you even knowing.
    HardReset and Charles Olson like this.
  12. Danny101

    Danny101 TS Guru Posts: 579   +231

    This just goes to show that processor optimizations can only go so far until you need a redesign or nanometer reduction for performance. AMD can fall into this trap if they don't watch it.
  13. Dustyn

    Dustyn TS Booster Posts: 86   +33

    I believe the first thing everybody should do here is to panic.
  14. JohnnyStone

    JohnnyStone TS Enthusiast Posts: 67   +34

    I could not have said it better. Many years ago I said that people who buy Intel CPU's share in the evil the company is doing and will share in the result as well. If you walk with people who use the sword, you might die by the sword!
    HardReset likes this.
  15. Shadowboxer

    Shadowboxer TS Booster Posts: 127   +46

    Care to explain why you think Intel buyers deserve to be punished?

    You AMD fanboys are getting more and more desperate everyday.
    Last edited: Jun 15, 2018
  16. BrianMontanye

    BrianMontanye TS Booster Posts: 81   +53

    You do realize AMD has the same, if not worse flaws right?

  17. BrianMontanye

    BrianMontanye TS Booster Posts: 81   +53

  18. HardReset

    HardReset TS Guru Posts: 639   +259

    For supporting company that does so much dirty tricks.

    No, I don't. "Same or not worse" :D All those "flaws" require admin access, most require local admin access.

    Using Spectre or Meltdown vulnerability do not require admin access, so "(y)"
  19. Shadowboxer

    Shadowboxer TS Booster Posts: 127   +46

    I really pity you.
    HardReset likes this.
  20. Theinsanegamer

    Theinsanegamer TS Evangelist Posts: 1,424   +1,586

    This is a really short sighted statement. Phenom II wasnt on par with sandy bridge, and was almost 3 years old when bulldozer finally came out, after intel sent them through the ringer.

    Bulldozer was an abysmal failure, piledriver was slightly better, then AMD just gave up for about 3-4 years on the CPU market altogether, only finally competing last year. And before that, phenom II was really playing catchup after AMD's phenom was slower then expected, and they sat for years selling athlon 64 when the core 2 chips were getting progressively faster every 6 months.

    You cant blame people for buying Intel CPUs when all AMD could do was drop the ball time and time again while trying to maintain ATi at the same time. If you wanted a fast CPU, you bought Intel, full stop. Especially from 2012-2017, when AMD was too busy sucking its own thumb to pay any attention to the world around it.
    Shadowboxer and BrianMontanye like this.
  21. HardReset

    HardReset TS Guru Posts: 639   +259

    Athlon64 was faster, cheaper and cooler than anything Intel had. Athlon64 didn't sell well because Intel bribed manufacturers for not even accept AMD CPU's for free (that's 0$). Everything you said is direct consequence of Intel's dirty tricks around Athlon64 era. For example Bulldozer had several bugs that AMD never bothered to fix, those resources was added to Zen architecture development. That's why Piledriver never got successor, Steamroller and Excavator were for APU's.

    So you could blame server dumbasses for not buying AMD at time when AMD had clearly superior product. And big reason for that were Intel's dirty tricks. Simple as that.
    kgbme likes this.
  22. texasrattler

    texasrattler TS Evangelist Posts: 512   +186

    Why you act like Intel is the only one playing dirty. You think AMD play fair, your ignorant if you think that.
    All manufacturers do things, there is no exception.
    Shadowboxer and kgbme like this.
  23. kgbme

    kgbme TS Rookie

    My first response, as well: No way, LOL!! xD

    Wait, what?.. Why?? o.0

    I'll agree with most things (here), except for:

    ^^ Such claims are, simply, not true. Why are people quick to mislead, when it comes to AMD being (so much) cheaper than Intel?!

    (Especially when all said and done, Intel still has the upper hand; performance-wise and, also, when it comes to power consumption. Correct?!)
    Last edited: Jun 15, 2018
  24. kgbme

    kgbme TS Rookie

    Um (!), Windows 10 WILL push out (automatic!) updates, right!? Ones that concern Intel CPUs. Not trying to spam the forums, here, but had to make another comment - and ask about this!!

    So, anyone running Windows 10 will get the patches and will experience all (possible slowdown) effects!?

    Unless, ofc., your (Windows) system is configured via Group Policy, Local Group Policy, to not get automagically updated.

    EDIT: Btw., there's a great (new) tool, to control a bunch of privacy options (including updates) @

    (Check their page, they've got Discord, as well!..:))
    HardReset likes this.
  25. HardReset

    HardReset TS Guru Posts: 639   +259

    Sources for AMD playing dirty on CPU market? There are plenty of sources that say Intel plays dirty but nearly zero sources that say AMD plays dirty.

    So much for that "theory".

    Power consumption, incorrect.

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