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Date:   Sun, 24 Oct 2021 06:24:17 +0200 (CEST)
From:   "Maciej W. Rozycki" <>
To:     "Eric W. Biederman" <>
        Linus Torvalds <>,
        Oleg Nesterov <>,
        Al Viro <>,
        Kees Cook <>,
        Thomas Bogendoerfer <>,
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 <>


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