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

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On Tue, Apr 6, 2021 at 7:33 PM Zbigniew Jędrzejewski-Szmek
<zbyszek@xxxxxxxxx> wrote:
> On Tue, Apr 06, 2021 at 06:57:27PM +0200, Ondrej Mosnacek wrote:
> > Hi all,
> >
> > 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.
>
> https://codesearch.debian.net/search?q=userfaultfd(&literal=1
> lists a few candidates…

Thanks, that's a nice tool!

Filtering out false-positives, the kernel itself, and user programs
that would normally run under unconfined_t, packages dead in Fedora,
..., the only relevant one seems to be 'criu' (already mentioned in
this thread). Strange that it didn't find QEMU... maybe needs a more
generic search...

--
Ondrej Mosnacek
Software Engineer, Linux Security - SELinux kernel
Red Hat, Inc.
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