Re: [Qemu-devel] [PATCH] seccomp: change configure to avoid arm 32 to break

[Paul Moore]

On Wednesday, November 05, 2014 05:08:20 PM Peter Maydell wrote:
> On 5 November 2014 16:47, Eduardo Otubo wrote:
> > Right now seccomp is breaking the compilation of Qemu on armv7l due
> > to libsecomp current lack of support for this arch. This problem is
> > already fixed on libseccomp upstream but no release date for that is
> > scheduled to far. This patch disables support for seccomp on armv7l
> > temporarily until libseccomp does a new release. Then I'll remove the
> > hack and update libseccomp dependency on configure script.
> > 
> > Related bug: https://bugs.launchpad.net/qemu/+bug/1363641

...

> (How are upstream proposing to fix this anyway? I couldn't
> figure that out from the mailing list thread.)

The problem was that the released version of libseccomp has some "holes" in 
the internal syscall table for 32-bit ARM with respect to all of the other 
supported architectures.  The current libseccomp upstream has some additional 
tooling and checks to ensure that the different ABI syscall tables are kept in 
sync to prevent something like this from happening in the future.

I'm more than happy to discuss how libseccomp handles the different 
architectures, but that's probably a bit off-topic for this thread.

-- 
paul moore
security and virtualization @ redhat