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Message-Id: <20231003083836.100706-1-hengqi.chen@gmail.com>
Date: Tue, 3 Oct 2023 08:38:34 +0000
From: Hengqi Chen <hengqi.chen@...il.com>
To: linux-kernel@...r.kernel.org, bpf@...r.kernel.org
Cc: keescook@...omium.org, luto@...capital.net, wad@...omium.org,
alexyonghe@...cent.com, hengqi.chen@...il.com
Subject: [RFC PATCH 0/2] seccomp: Split set filter into two steps
This patchset introduces two new operations which essentially
splits the SECCOMP_SET_MODE_FILTER process into two steps:
SECCOMP_LOAD_FILTER and SECCOMP_ATTACH_FILTER.
The SECCOMP_LOAD_FILTER loads the filter and returns a fd
which can be pinned to bpffs. This extends the lifetime of the
filter and thus can be reused by different processes.
With this new operation, we can eliminate a hot path of JITing
BPF program (the filter) where we apply the same seccomp filter
to thousands of micro VMs on a bare metal instance.
The SECCOMP_ATTACH_FILTER is used to attach a loaded filter.
The filter is represented by a fd which is either returned
from SECCOMP_LOAD_FILTER or obtained from bpffs using bpf syscall.
Hengqi Chen (2):
seccomp: Introduce SECCOMP_LOAD_FILTER operation
seccomp: Introduce SECCOMP_ATTACH_FILTER operation
include/uapi/linux/seccomp.h | 2 +
kernel/seccomp.c | 138 ++++++++++++++++++++++++++++++++++-
2 files changed, 136 insertions(+), 4 deletions(-)
--
2.34.1
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