linux-kernel - Re: [PATCH 05/20] signal/mips: Update (_save|_restore)_fp

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Date:   Sun, 24 Oct 2021 06:24:17 +0200 (CEST)
From:   "Maciej W. Rozycki" <macro@...am.me.uk>
To:     "Eric W. Biederman" <ebiederm@...ssion.com>
cc:     linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Oleg Nesterov <oleg@...hat.com>,
        Al Viro <viro@...IV.linux.org.uk>,
        Kees Cook <keescook@...omium.org>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        linux-mips@...r.kernel.org
Subject: Re: [PATCH 05/20] signal/mips: Update (_save|_restore)_fp_context
 to fail with -EFAULT

On Wed, 20 Oct 2021, Eric W. Biederman wrote:

> When an instruction to save or restore a register from the stack fails
> in _save_fp_context or _restore_fp_context return with -EFAULT.  This
> change was made to r2300_fpu.S[1] but it looks like it got lost with
> the introduction of EX2[2].  This is also what the other implementation
> of _save_fp_context and _restore_fp_context in r4k_fpu.S does, and
> what is needed for the callers to be able to handle the error.

 Umm, right, good catch, thanks!  I think this ought to be backported.

Acked-by: Maciej W. Rozycki <macro@...am.me.uk>

  Maciej