From patchwork Tue Mar 23 20:39:44 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sami Tolvanen X-Patchwork-Id: 12159283 X-Patchwork-Delegate: kuba@kernel.org 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, USER_AGENT_GIT,USER_IN_DEF_DKIM_WL autolearn=ham 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 D98CBC433E0 for ; Tue, 23 Mar 2021 20:41:11 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id B0221619D3 for ; Tue, 23 Mar 2021 20:41:11 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233665AbhCWUkn (ORCPT ); Tue, 23 Mar 2021 16:40:43 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:45008 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233565AbhCWUkR (ORCPT ); Tue, 23 Mar 2021 16:40:17 -0400 Received: from mail-yb1-xb4a.google.com (mail-yb1-xb4a.google.com [IPv6:2607:f8b0:4864:20::b4a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 4C12CC0613DD for ; Tue, 23 Mar 2021 13:40:17 -0700 (PDT) Received: by mail-yb1-xb4a.google.com with SMTP id v124so3798429ybc.15 for ; Tue, 23 Mar 2021 13:40:17 -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=qAbADIQAzXUoq/ElYpa9rjjQHxphEP8wPywcql//gEU=; b=T9lYeG1vNkvikIi777MRSbbTtj3IaPeu7RN7uXeSPXvS4b9+WLGfOdasWEAHo+i17u 3080AmXMs2xVaLte8P7ahk8JJEdHsGELqvOLIoahy4V4PMsoqaf2aZV65W6Qbg5iWS+h b6ti/m6+OZ84hMZziyoN5GFocxb13Za6OwHGFrBaUy1iO+H9JEiP0tyCwkF3p/KzGz5a KI2Lj51XAl8PJy62wWStBc6KSEOp8id1hQ564UGK3S0iIjj4kUsIubPJjw5De4OUhc9s huAxEcZhyUcc7CzcBmMkKd6YmZw4qc0E+2UxOVGGUsXyQLc3FPDMC5xWzijn66SgJ0Xs vHJQ== 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=qAbADIQAzXUoq/ElYpa9rjjQHxphEP8wPywcql//gEU=; b=GUpLz/Rd7ljz24nSWR0Q5/J5FvhFHSDfeLwMFBgJwtkSdrH04GCDiH9QB4bjGuptfb 5a49eTHGd1VduFDo7CtflReYdRZpTsOXrZJjuShryMfhLezePsAO2v0Ct8xpKOeMYW2c /juiaPmFTMnmgZxNkAJAfoh0gF90Fy8WbEgfFOqb2uXF9lj3ADJAUaFhXJ8SB8LAanp/ M1V2pcX8GcraqULpQFAxZP5mg99lT5qts4HNySOrZ7S+b/SUICVBoiTvBMpBTN1jAW+X Ff2mNRZhDO/fu4WUh+UCnsr7bemwDhCe3NwBtUPbxfj13NUFH1I5MMwsk7sKeJsqOLNI hTlQ== X-Gm-Message-State: AOAM532XNt8mcXAG1LUk6ViaSHVtwPn6+6EWyyjcv8Bmaoml315+4Jx4 B/TcAD7Q2et2Rc+eq0YkQQ6Fp6fcGjznI5p1mvI= X-Google-Smtp-Source: ABdhPJwmStks0YRxHTnj25YBiyDAjN/ixvNa9lapKnlHKARYrFssO9o0nOXAMkPoRpi0g6QTRn8BhWyhoUBcjcDwMF8= X-Received: from samitolvanen1.mtv.corp.google.com ([2620:15c:201:2:e9a3:260d:763b:67dc]) (user=samitolvanen job=sendgmr) by 2002:a25:3493:: with SMTP id b141mr100244yba.342.1616532016542; Tue, 23 Mar 2021 13:40:16 -0700 (PDT) Date: Tue, 23 Mar 2021 13:39:44 -0700 In-Reply-To: <20210323203946.2159693-1-samitolvanen@google.com> Message-Id: <20210323203946.2159693-16-samitolvanen@google.com> Mime-Version: 1.0 References: <20210323203946.2159693-1-samitolvanen@google.com> X-Mailer: git-send-email 2.31.0.291.g576ba9dcdaf-goog Subject: [PATCH v3 15/17] arm64: add __nocfi to __apply_alternatives 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 , Peter Zijlstra , 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 __apply_alternatives makes indirect calls to functions whose address is taken in assembly code using the alternative_cb macro. With non-canonical CFI, the compiler won't replace these function references with the jump table addresses, which trips CFI. Disable CFI checking in the function to work around the issue. Signed-off-by: Sami Tolvanen Reviewed-by: Kees Cook --- arch/arm64/kernel/alternative.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/arch/arm64/kernel/alternative.c b/arch/arm64/kernel/alternative.c index 1184c44ea2c7..abc84636af07 100644 --- a/arch/arm64/kernel/alternative.c +++ b/arch/arm64/kernel/alternative.c @@ -133,8 +133,8 @@ static void clean_dcache_range_nopatch(u64 start, u64 end) } while (cur += d_size, cur < end); } -static void __apply_alternatives(void *alt_region, bool is_module, - unsigned long *feature_mask) +static void __nocfi __apply_alternatives(void *alt_region, bool is_module, + unsigned long *feature_mask) { struct alt_instr *alt; struct alt_region *region = alt_region;