| From: |
| Hengqi Chen <hengqi.chen-AT-gmail.com> |
| To: |
| linux-kernel-AT-vger.kernel.org, bpf-AT-vger.kernel.org |
| Subject: |
| [PATCH 0/4] seccomp: Make seccomp filter reusable |
| Date: |
| Mon, 09 Oct 2023 12:40:42 +0000 |
| Message-ID: |
| <20231009124046.74710-1-hengqi.chen@gmail.com> |
| Cc: |
| keescook-AT-chromium.org, ast-AT-kernel.org, daniel-AT-iogearbox.net, andrii-AT-kernel.org, luto-AT-amacapital.net, wad-AT-chromium.org, alexyonghe-AT-tencent.com, hengqi.chen-AT-gmail.com |
| Archive-link: |
| Article |
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.
Changes from RFC ([0]):
- Addressed comments from Kees
- Reuse filter copy/create code (patch 1)
- Add a selftest (patch 4)
[0]: https://lore.kernel.org/all/20231003083836.100706-1-hengq...
Hengqi Chen (4):
seccomp: Refactor filter copy/create for reuse
seccomp, bpf: Introduce SECCOMP_LOAD_FILTER operation
seccomp: Introduce SECCOMP_ATTACH_FILTER operation
selftests/seccomp: Test SECCOMP_LOAD_FILTER and SECCOMP_ATTACH_FILTER
include/uapi/linux/bpf.h | 1 +
include/uapi/linux/seccomp.h | 2 +
kernel/seccomp.c | 184 +++++++++++++++---
tools/testing/selftests/seccomp/seccomp_bpf.c | 20 ++
4 files changed, 180 insertions(+), 27 deletions(-)
--
2.34.1
