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

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Subject: Re: [PATCH v2 seccomp 3/6] seccomp/cache: Add "emulator" to check if filter is arg-dependent
From: YiFei Zhu <zhuyifei1999@xxxxxxxxx>
Date: Fri, 25 Sep 2020 11:45:05 -0500
Cc: Linux Containers <containers@xxxxxxxxxxxxxxxxxxxxxxxxxx>, YiFei Zhu <yifeifz2@xxxxxxxxxxxx>, bpf <bpf@xxxxxxxxxxxxxxx>, kernel list <linux-kernel@xxxxxxxxxxxxxxx>, Aleksa Sarai <cyphar@xxxxxxxxxx>, Andrea Arcangeli <aarcange@xxxxxxxxxx>, Andy Lutomirski <luto@xxxxxxxxxxxxxx>, Dimitrios Skarlatos <dskarlat@xxxxxxxxxx>, Giuseppe Scrivano <gscrivan@xxxxxxxxxx>, Hubertus Franke <frankeh@xxxxxxxxxx>, Jack Chen <jianyan2@xxxxxxxxxxxx>, Jann Horn <jannh@xxxxxxxxxx>, Josep Torrellas <torrella@xxxxxxxxxxxx>, Tianyin Xu <tyxu@xxxxxxxxxxxx>, Tobin Feldman-Fitzthum <tobin@xxxxxxx>, Tycho Andersen <tycho@tycho.pizza>, Valentin Rothberg <vrothber@xxxxxxxxxx>, Will Drewry <wad@xxxxxxxxxxxx>
In-reply-to: <CABqSeARb7GNU9+sVgGzgqqOmpQNpxq1JsMrZJvS2EC05AyfAVw@mail.gmail.com>

On Thu, Sep 24, 2020 at 10:04 PM YiFei Zhu <zhuyifei1999@xxxxxxxxx> 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

Follow-Ups:
- Re: [PATCH v2 seccomp 3/6] seccomp/cache: Add "emulator" to check if filter is arg-dependent
  - From: Kees Cook

References:
- [PATCH v2 seccomp 0/6] seccomp: Add bitmap cache of arg-independent filter results that allow syscalls
  - From: YiFei Zhu
- [PATCH v2 seccomp 3/6] seccomp/cache: Add "emulator" to check if filter is arg-dependent
  - From: YiFei Zhu
- Re: [PATCH v2 seccomp 3/6] seccomp/cache: Add "emulator" to check if filter is arg-dependent
  - From: Kees Cook
- Re: [PATCH v2 seccomp 3/6] seccomp/cache: Add "emulator" to check if filter is arg-dependent
  - From: YiFei Zhu

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