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([43.132.98.112]) by smtp.googlemail.com with ESMTPSA id t28-20020aa7939c000000b0068a46cd4120sm7044809pfe.199.2023.10.09.19.02.11 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 09 Oct 2023 19:02:12 -0700 (PDT) From: Hengqi Chen To: linux-kernel@vger.kernel.org, bpf@vger.kernel.org Cc: keescook@chromium.org, ast@kernel.org, daniel@iogearbox.net, andrii@kernel.org, luto@amacapital.net, wad@chromium.org, alexyonghe@tencent.com, hengqi.chen@gmail.com Subject: [PATCH 0/4] seccomp: Make seccomp filter reusable Date: Mon, 9 Oct 2023 12:40:42 +0000 Message-Id: <20231009124046.74710-1-hengqi.chen@gmail.com> X-Mailer: git-send-email 2.34.1 MIME-Version: 1.0 X-Spam-Status: No, score=3.8 required=5.0 tests=DATE_IN_PAST_12_24,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,RCVD_IN_SBL_CSS, SPF_HELO_NONE,SPF_PASS autolearn=no autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on pete.vger.email Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-Greylist: Sender passed SPF test, not delayed by milter-greylist-4.6.4 (pete.vger.email [0.0.0.0]); Mon, 09 Oct 2023 19:02:31 -0700 (PDT) X-Spam-Level: *** X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1779332130675618810 X-GMAIL-MSGID: 1779332130675618810 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-hengqi.chen@gmail.com/ 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(-)