V4 [PATCH 04/12] x86/CET: Extend arch_prctl syscall for CET control

[Sergey Senozhatsky]

On (08/13/18 13:10), Florian Weimer wrote:
> On 08/13/2018 06:51 AM, Sergey Senozhatsky wrote:
> > [    8.864561] process: tty: Unsupported common prctl 3001
> > [    8.865664] expr: Unsupported prctl 3001
> > [..]
> > 
> > Which is, maybe fine, though I'm not entirely sure since I don't
> > really see ARCH_CET being supported by any arch (neither in linux-next
> > nor in Linus' tree), so maybe as of now those syscalls are unneeded.
> 
> Which kernel version is that?  The above looks like a kernel bug because
> there doesn't seem to be any rate limiting.

Oh, my bad. Sorry, I should have mentioned that it was my own kernel
modification just to see how often I get -EINVAL prctl syscalls.

> > The part where, I believe, these -EINVAL prctls begin to backfire is
> > valgrind - I can't run it anymore with glibc 2.28. It gives me the
> > following error:
> 
> valgrind has already been fixed:
> 
>   https://bugs.kde.org/show_bug.cgi?id=396887

Nice, thanks for the info!

The fact that there are so many -EINVAL syscalls is still a bit
misleading, tho.

	-ss