linux-kernel - Re: [PATCH v2 seccomp 3/6] seccomp/cache: Add "emulator" to check if filter is arg-dependent

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Date:   Fri, 25 Sep 2020 11:45:05 -0500
From:   YiFei Zhu <zhuyifei1999@...il.com>
To:     Kees Cook <keescook@...omium.org>
Cc:     Linux Containers <containers@...ts.linux-foundation.org>,
        YiFei Zhu <yifeifz2@...inois.edu>, bpf <bpf@...r.kernel.org>,
        kernel list <linux-kernel@...r.kernel.org>,
        Aleksa Sarai <cyphar@...har.com>,
        Andrea Arcangeli <aarcange@...hat.com>,
        Andy Lutomirski <luto@...capital.net>,
        Dimitrios Skarlatos <dskarlat@...cmu.edu>,
        Giuseppe Scrivano <gscrivan@...hat.com>,
        Hubertus Franke <frankeh@...ibm.com>,
        Jack Chen <jianyan2@...inois.edu>,
        Jann Horn <jannh@...gle.com>,
        Josep Torrellas <torrella@...inois.edu>,
        Tianyin Xu <tyxu@...inois.edu>,
        Tobin Feldman-Fitzthum <tobin@....com>,
        Tycho Andersen <tycho@...ho.pizza>,
        Valentin Rothberg <vrothber@...hat.com>,
        Will Drewry <wad@...omium.org>
Subject: Re: [PATCH v2 seccomp 3/6] seccomp/cache: Add "emulator" to check if
 filter is arg-dependent

On Thu, Sep 24, 2020 at 10:04 PM YiFei Zhu <zhuyifei1999@...il.com> wrote:
> > Why do the prepare here instead of during attach? (And note that it
> > should not be written to fail.)
>
> Right.

During attach a spinlock (current->sighand->siglock) is held. Do we
really want to put the emulator in the "atomic section"?

YiFei Zhu