From patchwork Thu Mar 18 17:11:02 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sami Tolvanen X-Patchwork-Id: 12148815 X-Patchwork-Delegate: bpf@iogearbox.net 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=-26.3 required=3.0 tests=BAYES_00,DKIMWL_WL_MED, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_GIT,USER_IN_DEF_DKIM_WL 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 E6D10C4646C for ; Thu, 18 Mar 2021 17:12:17 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id D5B7464F30 for ; Thu, 18 Mar 2021 17:12:17 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232389AbhCRRLp (ORCPT ); Thu, 18 Mar 2021 13:11:45 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:33272 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232321AbhCRRLe (ORCPT ); Thu, 18 Mar 2021 13:11:34 -0400 Received: from mail-qv1-xf4a.google.com (mail-qv1-xf4a.google.com [IPv6:2607:f8b0:4864:20::f4a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 499B5C061761 for ; Thu, 18 Mar 2021 10:11:34 -0700 (PDT) Received: by mail-qv1-xf4a.google.com with SMTP id l7so10833836qvz.19 for ; Thu, 18 Mar 2021 10:11:34 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=date:in-reply-to:message-id:mime-version:references:subject:from:to :cc; bh=hHyY7qre9OXEm5PJ4BWXLYwsH5KdHQkHk/skTedwvAs=; b=Lde7CebUF+4MxFHwi/QJePFqufNlE/xCS5gC7b6UYbWiT83z2QpxmEMFBH6B9+0bKu RhxhEy/0hJzTcT6jiCO9gz0BR3b9RfC3YFtEhlWvSsaiN8+yZEftdB2vRtJbab9pJGnz hhwyh3gK1jRpm2AHlwxPUp8zEWKcK6N0fKUecc4oGnZfI3XAfmpaFwlV/7CfzGpeoEIu goWoD51rPTb8RPqdYHUhm0haB65coJQBNiJsljlUPOYKHXrHl36/fcEE89f3gqz2makA D8Y9Fop2eU0OGiHWOJqP9vl/G1TmJkyHQj6G615Ry5DyKmRyqFjqOyQp9kAArmMMqUR1 awKQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:in-reply-to:message-id:mime-version :references:subject:from:to:cc; bh=hHyY7qre9OXEm5PJ4BWXLYwsH5KdHQkHk/skTedwvAs=; b=eii2VwPW44yxC00pnzxy8mU3L1B+W2Eykiou204yK2dFnwiCDu41gap23WLG7hiFUA 2DQMwIuN+AYRbmphopsk6z0EzWa5NNecCVmK8/jZ5WHPsq9TKbFyUPan3s2mgJTaVqgn hVU//9HTWYdZhaSltQFg0QsQIAYOnnFdLy2p6QrmnefuI57iziobZRxBigPfQA0jk9Qr mcS7JTl//LT00iAfHTZgJq5go9fMPMFFxVsqlOnAfciMVXqVAA+Zg+kFQnLxsGfAh4Zb ssP2LsmbUCVZRwx48gZRpjUQp5x+qaVM7eCD7FQLVg4pQ6lKL7yIcE2UU2QC+YTo5lls tSbw== X-Gm-Message-State: AOAM533GZmOvK0HBVOBUvnU24m9tpojNM+E+3qnG5w32nUR/Dxhigv6g wgMmhJVTulaDVXMu1tY68BFSYXzrXQoYzYgiuhM= X-Google-Smtp-Source: ABdhPJxE/giZ7AfYJ0TH9vEAyheMLl0QRNdj9iBaMv7F1HWLJlNkEqoVklDlggjrilm1xsf++JBcogV4/Smdr50eqyk= X-Received: from samitolvanen1.mtv.corp.google.com ([2620:15c:201:2:c0d7:a7ba:fb41:a35a]) (user=samitolvanen job=sendgmr) by 2002:a05:6214:1484:: with SMTP id bn4mr5338692qvb.8.1616087493471; Thu, 18 Mar 2021 10:11:33 -0700 (PDT) Date: Thu, 18 Mar 2021 10:11:02 -0700 In-Reply-To: <20210318171111.706303-1-samitolvanen@google.com> Message-Id: <20210318171111.706303-9-samitolvanen@google.com> Mime-Version: 1.0 References: <20210318171111.706303-1-samitolvanen@google.com> X-Mailer: git-send-email 2.31.0.291.g576ba9dcdaf-goog Subject: [PATCH v2 08/17] bpf: disable CFI in dispatcher functions From: Sami Tolvanen To: Kees Cook Cc: Nathan Chancellor , Nick Desaulniers , Masahiro Yamada , Will Deacon , Jessica Yu , Arnd Bergmann , Tejun Heo , "Paul E. McKenney" , Christoph Hellwig , bpf@vger.kernel.org, linux-hardening@vger.kernel.org, linux-arch@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kbuild@vger.kernel.org, linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org, Sami Tolvanen Precedence: bulk List-ID: X-Mailing-List: bpf@vger.kernel.org X-Patchwork-Delegate: bpf@iogearbox.net BPF dispatcher functions are patched at runtime to perform direct instead of indirect calls. Disable CFI for the dispatcher functions to avoid conflicts. Signed-off-by: Sami Tolvanen Reviewed-by: Kees Cook --- include/linux/bpf.h | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/include/linux/bpf.h b/include/linux/bpf.h index cccaef1088ea..9acdca574527 100644 --- a/include/linux/bpf.h +++ b/include/linux/bpf.h @@ -635,7 +635,7 @@ struct bpf_dispatcher { struct bpf_ksym ksym; }; -static __always_inline unsigned int bpf_dispatcher_nop_func( +static __always_inline __nocfi unsigned int bpf_dispatcher_nop_func( const void *ctx, const struct bpf_insn *insnsi, unsigned int (*bpf_func)(const void *, @@ -663,7 +663,7 @@ void bpf_trampoline_put(struct bpf_trampoline *tr); } #define DEFINE_BPF_DISPATCHER(name) \ - noinline unsigned int bpf_dispatcher_##name##_func( \ + noinline __nocfi unsigned int bpf_dispatcher_##name##_func( \ const void *ctx, \ const struct bpf_insn *insnsi, \ unsigned int (*bpf_func)(const void *, \