From patchwork Tue Oct 27 17:03:12 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: KP Singh X-Patchwork-Id: 11861053 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-11.9 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 72459C55179 for ; Tue, 27 Oct 2020 17:04:02 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 1E4BC20809 for ; Tue, 27 Oct 2020 17:04:02 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=chromium.org header.i=@chromium.org header.b="bu6iuWWp" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1815587AbgJ0RDZ (ORCPT ); Tue, 27 Oct 2020 13:03:25 -0400 Received: from mail-ed1-f66.google.com ([209.85.208.66]:42173 "EHLO mail-ed1-f66.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1815581AbgJ0RDY (ORCPT ); Tue, 27 Oct 2020 13:03:24 -0400 Received: by mail-ed1-f66.google.com with SMTP id v19so2189077edx.9 for ; Tue, 27 Oct 2020 10:03:22 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; h=from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=VcwOwa9EHhzsLgIT0w+isolvWhZrELRj+sCf5wcyL5o=; b=bu6iuWWpweGAMhCSz/ektPdwFCA/R7pnbEw9LoYrlMJ+sbahe1oO6FFaIjNuaVzpZx Uf9AuMFXhFodPPYhIIjV4xpMslgCGY3fp8ZqAMvOr9FZzlzjW4pt7+tZavv//VfZVtVy EAKFROGybNBzpGmu9Vs+lckBwI/oAvY0L4SVA= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=VcwOwa9EHhzsLgIT0w+isolvWhZrELRj+sCf5wcyL5o=; b=FpJzMt/NwDhk3BAhrL0ZQQWiiQP2TOQno52wLoDC2fXt9oMk+znBTWixETsgqkP5H0 1kJgkNpu/VP7sYFzWexQizdfDV5iE9M9rwolbaJiHTtGZr/p6C78CAgv2gsOKTOpdpIT If0EQZgIzpgrNHMmr1WHcqBwhepbcyiJWTbIzT9DCpK0HoYyyFY1V1cYT/A8eHfKdo0K GOggMtzuWrTteoV76VUeTTUXTrOtl8NzwLZiENumbnmheY419ABQltUrPtQiRMNOQHVp JVosR37fTrEyKLydPaVzG6TMwQZwt/wJDTUozxOwGM23quZCcwbo9Q5pYbp+JVT+i61n Dgkw== X-Gm-Message-State: AOAM532MwWjKSXvNayVVW/fKSReGKcjTMYEwbGjlTijKUNz51Th0uDr8 ns0za8VfZI5jOuz1LGVWffkhXw== X-Google-Smtp-Source: ABdhPJxr6mJXRzOgH1Mizg8jwVSb6kkt7H3J5bQ1rwoJ4/eDrIB7JU+oab7eG697io25gxJbaFOdXA== X-Received: by 2002:a50:fc85:: with SMTP id f5mr3345693edq.187.1603818201541; Tue, 27 Oct 2020 10:03:21 -0700 (PDT) Received: from kpsingh.zrh.corp.google.com ([81.6.44.51]) by smtp.gmail.com with ESMTPSA id ba6sm1315006edb.61.2020.10.27.10.03.20 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 27 Oct 2020 10:03:20 -0700 (PDT) From: KP Singh To: linux-kernel@vger.kernel.org, bpf@vger.kernel.org Cc: Alexei Starovoitov , Daniel Borkmann , Martin KaFai Lau , Paul Turner , Jann Horn , Hao Luo Subject: [PATCH bpf-next 0/5] Implement task_local_storage Date: Tue, 27 Oct 2020 18:03:12 +0100 Message-Id: <20201027170317.2011119-1-kpsingh@chromium.org> X-Mailer: git-send-email 2.29.0.rc2.309.g374f81d7ae-goog MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: bpf@vger.kernel.org X-Patchwork-Delegate: bpf@iogearbox.net From: KP Singh We already have socket and inode local storage since [1] This patch series: * Implements bpf_local_storage for task_struct. * Implements the bpf_get_current_task_btf helper which returns a BTF pointer to the current task. Not only is this generally cleaner (reading from the task_struct currently requires BPF_CORE_READ), it also allows the BTF pointer to be used in task_local_storage helpers. * In order to implement this helper, a RET_PTR_TO_BTF_ID is introduced which works similar to RET_PTR_TO_BTF_ID_OR_NULL but does not require a nullness check. * Implements a detection in selftests which uses the task local storage to deny a running executable from unlinking itself. [1]: https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git/commit/?id=f836a56e84ffc9f1a1cd73f77e10404ca46a4616 KP Singh (5): bpf: Implement task local storage bpf: Implement get_current_task_btf and RET_PTR_TO_BTF_ID bpf: Fix tests for local_storage bpf: Update selftests for local_storage to use vmlinux.h bpf: Add tests for task_local_storage include/linux/bpf.h | 1 + include/linux/bpf_lsm.h | 23 ++ include/linux/bpf_types.h | 1 + include/uapi/linux/bpf.h | 48 +++ kernel/bpf/Makefile | 1 + kernel/bpf/bpf_lsm.c | 4 + kernel/bpf/bpf_task_storage.c | 327 ++++++++++++++++++ kernel/bpf/syscall.c | 3 +- kernel/bpf/verifier.c | 20 +- kernel/trace/bpf_trace.c | 16 + security/bpf/hooks.c | 2 + .../bpf/bpftool/Documentation/bpftool-map.rst | 3 +- tools/bpf/bpftool/bash-completion/bpftool | 2 +- tools/bpf/bpftool/map.c | 4 +- tools/include/uapi/linux/bpf.h | 48 +++ tools/lib/bpf/libbpf_probes.c | 2 + .../bpf/prog_tests/test_local_storage.c | 89 ++++- .../selftests/bpf/progs/local_storage.c | 78 +++-- 18 files changed, 625 insertions(+), 47 deletions(-) create mode 100644 kernel/bpf/bpf_task_storage.c