Re: [uml-devel] SYSCALL, ptrace and syscall restart breakages (Re: [RFC] weird crap with vdso on uml/i386)

Linus Torvalds
2011-08-23T19:44:28Z

On Tue, Aug 23, 2011 at 12:41 PM, Al Viro <viro@zeniv.linux.org.uk> wrote:
>
> And it's not cheap - doing that on each syscall will be unpleasant...
> Frankly, I'd rather stopped telling the uml userland about vdso in such
> setups.  And anything that plays with SYSCALL outside of vdso... <shrug>
> we already have a "don't run it native on 32bit", adding "don't run
> it on 32bit uml on amd64 host" is not too serious.  At least for now...

I do agree that the solution might well be to just stop using the
non-int80 vdsos for UML. That may just solve everything in practice.

Linus