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

[Catalin Marinas]

On Thu, Dec 12, 2024 at 04:47:46PM +0000, Mark Brown wrote:
> On Tue, Dec 10, 2024 at 04:09:40PM +0000, Kevin Brodsky wrote:
> > While at it, also take care of copy_siginfo_to_user(): since it may
> > fail, we shouldn't be calling it after setup_return() either. Call
> > it before setup_return() instead, and move the setting of X1/X2
> > inside setup_return() where it belongs (after the "point of no
> > failure").
> 
> > 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.

-- 
Catalin