linux-kernel - Re: [PATCH V4 14/22] LoongArch: Add signal handling support

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Message-ID: <YVkVeREEIy23yVFX@zeniv-ca.linux.org.uk>
Date:   Sun, 3 Oct 2021 02:29:13 +0000
From:   Al Viro <viro@...iv.linux.org.uk>
To:     Huacai Chen <chenhuacai@...ngson.cn>
Cc:     Arnd Bergmann <arnd@...db.de>, Andy Lutomirski <luto@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Peter Zijlstra <peterz@...radead.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        David Airlie <airlied@...ux.ie>,
        Jonathan Corbet <corbet@....net>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        linux-arch@...r.kernel.org, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org, Xuefeng Li <lixuefeng@...ngson.cn>,
        Yanteng Si <siyanteng@...ngson.cn>,
        Huacai Chen <chenhuacai@...il.com>,
        Jiaxun Yang <jiaxun.yang@...goat.com>,
        Eric Biederman <ebiederm@...ssion.com>
Subject: Re: [PATCH V4 14/22] LoongArch: Add signal handling support

On Mon, Sep 27, 2021 at 02:42:51PM +0800, Huacai Chen wrote:
> This patch adds signal handling support for LoongArch.

No matter what you get in regs[4] after sys_rt_sigreturn(),
you should *NOT* treat it as restartable.  IOW, you need to set
regs[0] to 0 in there (or in restore_sigcontext()).  See e.g.
653d48b22166 for details of similar bug on arm.