From patchwork Mon Aug 1 18:01:44 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Frederick Lawler X-Patchwork-Id: 12933967 X-Patchwork-Delegate: paul@paul-moore.com Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id ECFD8C19F2C for ; Mon, 1 Aug 2022 18:02:46 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234275AbiHASCq (ORCPT ); Mon, 1 Aug 2022 14:02:46 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:42102 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234053AbiHASCV (ORCPT ); Mon, 1 Aug 2022 14:02:21 -0400 Received: from mail-oo1-xc2e.google.com (mail-oo1-xc2e.google.com [IPv6:2607:f8b0:4864:20::c2e]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 7FC6827CD0 for ; Mon, 1 Aug 2022 11:02:19 -0700 (PDT) Received: by mail-oo1-xc2e.google.com with SMTP id c203-20020a4a4fd4000000b0043566a4e265so2153911oob.2 for ; Mon, 01 Aug 2022 11:02:19 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=cloudflare.com; s=google; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc; bh=5eI4oBHRscjr08ZHNzQwOqsOD+3+F4rjZrnwT2lhjk8=; b=uLJivFt0JrijlTz4WiJCVuEF8oDRzf5Y7+H6eH45jC4nOYPshmi66MEhwrgCTE8YjQ yODopqvVSRyhcT85GJMk/fAiiPPldOdUR5F7OuR5KoOm4IRWjSJfjRi8lsTM6R3QM+QD UTvK9WXbkNelJtyCDqvAY/Rpe445Qz2Gi9NSI= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc; bh=5eI4oBHRscjr08ZHNzQwOqsOD+3+F4rjZrnwT2lhjk8=; b=AD98mAJaULtgWu9u7OYB5nVToytZTHDRlI4WP9o7BxtpaahTV0hRz5M/vRLaga0PEU /NZiF9TyFp5CBZQiGWZZlxq6JY6O/zbZZjdTyiiZh67Bio83c51QitaNOPfWzSik8y1f hEs6pbtCdp7RloMz1Z69z9TcfK81aV+MbIIwb7koOFAegoVgjzfe6xyXYCzChhxBc8OF OxvHPoWRr/xNHkJCIRDc0FOMLvbjnRDmoM7JqoUi78f/N5Ut9tudwmDy+dagQC7b7P2P n8SMkuqhWPZyfklO9AXaAq5gNMrWLvzZp7O1YrPQKI85bboDNf3QbNtLtIjcN9pVRZuY R3bw== X-Gm-Message-State: AJIora9m1MDez8aFQjpRh24Mad8NRgZqW2RSvXIi/OVmiU4xdLTAbmQA z36Mda2SjQB7vSjhIaUOEEjtCQ== X-Google-Smtp-Source: AGRyM1vzfAiBBDDyxwIMaZa0k2G9WulhjNQ80UDh1E2ApA6+RCreR0vgWj58f08ozl+TDSXb29hD7w== X-Received: by 2002:a4a:e7d8:0:b0:435:9a05:58b5 with SMTP id y24-20020a4ae7d8000000b004359a0558b5mr5600538oov.54.1659376938810; Mon, 01 Aug 2022 11:02:18 -0700 (PDT) Received: from localhost.localdomain ([184.4.90.121]) by smtp.gmail.com with ESMTPSA id n14-20020a9d64ce000000b00618fa37308csm2881348otl.35.2022.08.01.11.02.17 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 01 Aug 2022 11:02:18 -0700 (PDT) From: Frederick Lawler To: kpsingh@kernel.org, revest@chromium.org, jackmanb@chromium.org, ast@kernel.org, daniel@iogearbox.net, andrii@kernel.org, kafai@fb.com, songliubraving@fb.com, yhs@fb.com, john.fastabend@gmail.com, jmorris@namei.org, serge@hallyn.com, paul@paul-moore.com, stephen.smalley.work@gmail.com, eparis@parisplace.org, shuah@kernel.org, brauner@kernel.org, casey@schaufler-ca.com, ebiederm@xmission.com, bpf@vger.kernel.org, linux-security-module@vger.kernel.org, selinux@vger.kernel.org, linux-kselftest@vger.kernel.org Cc: linux-kernel@vger.kernel.org, netdev@vger.kernel.org, kernel-team@cloudflare.com, cgzones@googlemail.com, karl@bigbadwolfsecurity.com, Frederick Lawler Subject: [PATCH v4 2/4] bpf-lsm: Make bpf_lsm_userns_create() sleepable Date: Mon, 1 Aug 2022 13:01:44 -0500 Message-Id: <20220801180146.1157914-3-fred@cloudflare.com> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20220801180146.1157914-1-fred@cloudflare.com> References: <20220801180146.1157914-1-fred@cloudflare.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: selinux@vger.kernel.org Users may want to audit calls to security_create_user_ns() and access user space memory. Also create_user_ns() runs without pagefault_disabled(). Therefore, make bpf_lsm_userns_create() sleepable for mandatory access control policies. Signed-off-by: Frederick Lawler Acked-by: Christian Brauner (Microsoft) Acked-by: Alexei Starovoitov Acked-by: KP Singh --- Changes since v3: - None Changes since v2: - Rename create_user_ns hook to userns_create Changes since v1: - None --- kernel/bpf/bpf_lsm.c | 1 + 1 file changed, 1 insertion(+) diff --git a/kernel/bpf/bpf_lsm.c b/kernel/bpf/bpf_lsm.c index c1351df9f7ee..4593437809cc 100644 --- a/kernel/bpf/bpf_lsm.c +++ b/kernel/bpf/bpf_lsm.c @@ -250,6 +250,7 @@ BTF_ID(func, bpf_lsm_task_getsecid_obj) BTF_ID(func, bpf_lsm_task_prctl) BTF_ID(func, bpf_lsm_task_setscheduler) BTF_ID(func, bpf_lsm_task_to_inode) +BTF_ID(func, bpf_lsm_userns_create) BTF_SET_END(sleepable_lsm_hooks) bool bpf_lsm_is_sleepable_hook(u32 btf_id)