linux-kernel - Re: [PATCH] riscv: Remove unnecessary path for syscall

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Message-ID: <20200525143648.GM2605652@cisco>
Date:   Mon, 25 May 2020 08:36:48 -0600
From:   Tycho Andersen <tycho@...ho.ws>
To:     guoren@...nel.org
Cc:     keescook@...omium.org, palmerdabbelt@...gle.com,
        paul.walmsley@...ive.com, anup@...infault.org,
        linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Guo Ren <guoren@...ux.alibaba.com>
Subject: Re: [PATCH] riscv: Remove unnecessary path for syscall_trace

On Mon, May 25, 2020 at 02:18:26PM +0000, guoren@...nel.org wrote:
> From: Guo Ren <guoren@...ux.alibaba.com>
> 
> Obviously, there is no need to recover a0-a7 in reject path.
> 
> Previous modification is from commit af33d243 by Tycho, to
> fixup seccomp reject syscall code path.

Doesn't this suffer from the same problem, though? a7 is clobbered, so
the -ERESTARTSYS behavior won't work?

I haven't run the test case that was failing before.

Tycho