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([43.132.98.44]) by smtp.googlemail.com with ESMTPSA id gj6-20020a17090b108600b00285a2d14184sm660717pjb.0.2023.11.28.21.35.03 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 28 Nov 2023 21:35:04 -0800 (PST) From: Hengqi Chen To: linux-kernel@vger.kernel.org Cc: keescook@chromium.org, luto@amacapital.net, wad@chromium.org, alexyonghe@tencent.com, hengqi.chen@gmail.com Subject: [PATCH v3 0/3] seccomp: Make seccomp filter reusable Date: Wed, 29 Nov 2023 05:34:37 +0000 Message-Id: <20231129053440.41522-1-hengqi.chen@gmail.com> X-Mailer: git-send-email 2.34.1 MIME-Version: 1.0 X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,FREEMAIL_FROM, RCVD_IN_DNSWL_BLOCKED,SPF_HELO_NONE,SPF_PASS,T_SCC_BODY_TEXT_LINE autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net 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 (snail.vger.email [0.0.0.0]); Tue, 28 Nov 2023 21:35:11 -0800 (PST) X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1783875358837413729 X-GMAIL-MSGID: 1783875358837413729 This patchset introduces a new operation and a new flag to split the SECCOMP_SET_MODE_FILTER process into two steps: load filter and attach filter. Thus we can reuse the filter. The new SECCOMP_LOAD_FILTER loads the filter and returns a fd which can be reused for different processes via UDS. 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 new flag SECCOMP_FILTER_FLAG_FILTER_FD is used to attach a filter which is loaded via SECCOMP_LOAD_FILTER and represented by a seccomp filter fd. Change logs: v2 -> v3: - Stick to cBPF, don't interfere with bpffs v1 -> v2: - Add a flag to attach filter from fd - Update selftests RFC -> v1: - Addressed comments from Kees - Reuse filter copy/create code (patch 1) - Add a selftest (patch 4) Hengqi Chen (3): seccomp: Introduce SECCOMP_LOAD_FILTER operation seccomp: Introduce new flag SECCOMP_FILTER_FLAG_FILTER_FD selftests/seccomp: Test seccomp filter load and attach include/linux/seccomp.h | 3 +- include/uapi/linux/seccomp.h | 3 + kernel/seccomp.c | 78 ++++++++++++++++++- tools/testing/selftests/seccomp/seccomp_bpf.c | 71 +++++++++++++++++ 4 files changed, 151 insertions(+), 4 deletions(-) --- 2.34.1