Correct.

Zac Hansen <xax...@gmail.com> schrieb am Sa., 6. Jan. 2018, 21:43:

>
> There's no (meaningful) runtime performance difference between disabling
> it at compile vs runtime, correct?
>
>
> On Friday, January 5, 2018 at 9:33:12 AM UTC-8, Thomas Nattestad wrote:
>>
>> Hello users and embedders of V8,
>>
>> On January 3rd, researchers from Google's Project Zero
>> <https://googleprojectzero.blogspot.com/2014/07/announcing-project-zero.html>
>> disclosed a new class of attacks
>> <https://googleprojectzero.blogspot.com/> which exploit speculative
>> execution optimizations used by modern CPUs.
>>
>> As a user or embedder of V8, you may have questions regarding these
>> attacks and if they have any implications for you. We’ve put together a
>> new wiki page <https://github.com/v8/v8/wiki/Untrusted-code-mitigations>
>> regarding this topic that should serve to answer some of your questions.
>>
>> The main takeaway is that if you are an embedder such as Node.js that
>> only executes trustworthy code then there should be no security concerns
>> from these attack methods. In order to take advantage of the vulnerability,
>> an attacker has to execute carefully crafted JavaScript or WebAssembly code
>> in your embedded environment. If, as a developer, you have complete control
>> over the code executed in your embedded V8 instance, then that is very
>> unlikely to be possible.
>>
>> V8 is including some mitigation strategies for these attack methods as
>> part of V8 6.4.388.16. These will be on by default and we are putting them
>> behind a build flag to give embedders the option of whether they are
>> needed. More details can be found on the wiki page
>> <https://github.com/v8/v8/wiki/Untrusted-code-mitigations>.
>>
>> Sincerely,
>> The V8 Team
>>
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