Re: Looking for users of userfaultfd(2) syscall in Fedora

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* Colin Walters:

> On Tue, Apr 6, 2021, at 4:30 PM, Florian Weimer wrote:
>> * Ondrej Mosnacek:
>> 
>> > Kernel 5.12 added support to SELinux for controlling access to the
>> > userfaultfd interface [1][2] and we'd like to implement this in
>> > Fedora's selinux-policy. However, once we add the corresponding class
>> > to the policy, all SELinux domains for which we don't add the
>> > appropriate rules will have any usage of userfaultfd(2) denied.
>> 
>> What's special about this system call that this is necessary?
>
> https://lwn.net/Articles/835373/

I have some understanding of what the system call does, which is why I'm
asking the question.

Thanks,
Florian
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