From: YiFei Zhu <zhuyifei1999@gmail.com>
To: Kees Cook <keescook@chromium.org>
Cc: Jann Horn <jannh@google.com>,
Christian Brauner <christian.brauner@ubuntu.com>,
Tycho Andersen <tycho@tycho.pizza>,
Andy Lutomirski <luto@amacapital.net>,
Will Drewry <wad@chromium.org>,
Andrea Arcangeli <aarcange@redhat.com>,
Giuseppe Scrivano <gscrivan@redhat.com>,
Tobin Feldman-Fitzthum <tobin@ibm.com>,
Dimitrios Skarlatos <dskarlat@cs.cmu.edu>,
Valentin Rothberg <vrothber@redhat.com>,
Hubertus Franke <frankeh@us.ibm.com>, bpf <bpf@vger.kernel.org>,
Linux Containers <containers@lists.linux-foundation.org>,
linux-api@vger.kernel.org,
kernel list <linux-kernel@vger.kernel.org>,
Jack Chen <jianyan2@illinois.edu>,
Josep Torrellas <torrella@illinois.edu>,
Tianyin Xu <tyxu@illinois.edu>, YiFei Zhu <yifeifz2@illinois.edu>
Subject: Re: [PATCH 3/6] seccomp: Implement constant action bitmaps
Date: Wed, 23 Sep 2020 19:36:47 -0500 [thread overview]
Message-ID: <CABqSeAS=b6NQ=mqrD=hV60md3isYSDyAnE9QE_AT4=oYYFkAfQ@mail.gmail.com> (raw)
In-Reply-To: <DM6PR11MB271492D0565E91475D949F5DEF390@DM6PR11MB2714.namprd11.prod.outlook.com>
On Wed, Sep 23, 2020 at 6:29 PM Kees Cook <keescook@chromium.org> wrote:
> In order to optimize these cases from O(n) to O(1), seccomp can
> use bitmaps to immediately determine the desired action. A critical
> observation in the prior paragraph bears repeating: the common case for
> syscall tests do not check arguments. For any given filter, there is a
> constant mapping from the combination of architecture and syscall to the
> seccomp action result. (For kernels/architectures without CONFIG_COMPAT,
> there is a single architecture.). As such, it is possible to construct
> a mapping of arch/syscall to action, which can be updated as new filters
> are attached to a process.
Would you mind educating me how this patch plan one handling MIPS? For
one kernel they seem to have up to three arch numbers per build,
AUDIT_ARCH_MIPS{,64,64N32}. Though ARCH_TRACE_IGNORE_COMPAT_SYSCALLS
does not seem to be defined for MIPS so I'm assuming the syscall
numbers are the same, but I think it is possible some client uses that
arch number to pose different constraints for different processes, so
it would better not accelerate them rather than break them.
YiFei Zhu
next prev parent reply other threads:[~2020-09-24 0:38 UTC|newest]
Thread overview: 40+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-09-23 23:29 [PATCH v1 0/6] seccomp: Implement constant action bitmaps Kees Cook
2020-09-23 23:29 ` [PATCH 1/6] seccomp: Introduce SECCOMP_PIN_ARCHITECTURE Kees Cook
2020-09-24 0:41 ` Jann Horn
2020-09-24 7:11 ` Kees Cook
2020-09-23 23:29 ` [PATCH 2/6] x86: Enable seccomp architecture tracking Kees Cook
2020-09-24 0:45 ` Jann Horn
2020-09-24 7:12 ` Kees Cook
2020-09-23 23:29 ` [PATCH 3/6] seccomp: Implement constant action bitmaps Kees Cook
2020-09-24 0:25 ` Jann Horn
2020-09-24 7:36 ` Kees Cook
2020-09-24 8:07 ` YiFei Zhu
2020-09-24 8:15 ` Kees Cook
2020-09-24 8:22 ` YiFei Zhu
2020-09-24 12:28 ` Jann Horn
2020-09-24 12:37 ` David Laight
2020-09-24 12:56 ` Jann Horn
[not found] ` <DM6PR11MB271492D0565E91475D949F5DEF390@DM6PR11MB2714.namprd11.prod.outlook.com>
2020-09-24 0:36 ` YiFei Zhu [this message]
2020-09-24 7:38 ` Kees Cook
2020-09-24 7:51 ` YiFei Zhu
2020-09-23 23:29 ` [PATCH 4/6] seccomp: Emulate basic filters for constant action results Kees Cook
2020-09-23 23:47 ` Jann Horn
2020-09-24 7:46 ` Kees Cook
2020-09-24 15:28 ` Paul Moore
2020-09-24 19:52 ` Kees Cook
2020-09-24 20:46 ` Paul Moore
2020-09-24 21:35 ` Kees Cook
2020-09-23 23:29 ` [PATCH 5/6] selftests/seccomp: Compare bitmap vs filter overhead Kees Cook
2020-09-23 23:29 ` [PATCH 6/6] [DEBUG] seccomp: Report bitmap coverage ranges Kees Cook
2020-09-24 13:40 ` [PATCH v1 0/6] seccomp: Implement constant action bitmaps Rasmus Villemoes
2020-09-24 13:58 ` YiFei Zhu
2020-09-25 5:56 ` Rasmus Villemoes
2020-09-25 7:07 ` YiFei Zhu
2020-09-26 18:11 ` YiFei Zhu
2020-09-28 20:04 ` Kees Cook
2020-09-28 20:16 ` YiFei Zhu
2020-09-24 14:05 ` Jann Horn
2020-09-24 18:57 ` Andrea Arcangeli
2020-09-24 19:18 ` Jann Horn
[not found] ` <9dbe8e3bbdad43a1872202ff38c34ca2@DM5PR11MB1692.namprd11.prod.outlook.com>
2020-09-24 19:48 ` Tianyin Xu
2020-09-24 20:00 ` Kees Cook
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