[PATCH v2] arm64: signal: Ensure signal delivery failure is recoverable

[Catalin Marinas]

On Thu, Dec 12, 2024 at 05:26:47PM +0000, Mark Brown wrote:
> On Thu, Dec 12, 2024 at 05:10:14PM +0000, Catalin Marinas wrote:
> > On Thu, Dec 12, 2024 at 04:47:46PM +0000, Mark Brown wrote:
> > > > Fixes: eaf62ce1563b ("arm64/signal: Set up and restore the GCS context for signal handlers")
> > > 
> > > Presumably we also need a Fixes for whatever introduced the above copy.
> > 
> > Hmm, it was like this from the beginning. If we are to do a cc stable to
> > the oldest maintained LTS, I'd rather have a separate patch for
> > copy_siginfo_to_user(), it doesn't make much sense to backport a GCS
> > patch to early kernels.
> 
> Hrm, good point about it triggering backports.  I'm not sure it's worth
> doing that TBH.

I had the same thoughts. I think this was mostly triggered by the
POR_EL0 changes when Will raised the point that the kernel might return
with a more privileged value in this sysreg.

-- 
Catalin