From patchwork Fri Mar 12 00:49:11 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sami Tolvanen X-Patchwork-Id: 12133433 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=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 55E62C2BA19 for ; Fri, 12 Mar 2021 00:50:20 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 4628F64FA3 for ; Fri, 12 Mar 2021 00:50:20 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231367AbhCLAts (ORCPT ); Thu, 11 Mar 2021 19:49:48 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:52100 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231423AbhCLAti (ORCPT ); Thu, 11 Mar 2021 19:49:38 -0500 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 E600AC061761 for ; Thu, 11 Mar 2021 16:49:37 -0800 (PST) Received: by mail-yb1-xb4a.google.com with SMTP id 6so27799808ybq.7 for ; Thu, 11 Mar 2021 16:49:37 -0800 (PST) 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=6JZKTL3cv5f+QsuwZswDwzrYuKZX5rkh1eIr4Zfx2fE=; b=SdFCtfB+Erk7sy687mtu53wuRF76AZGcEYo50hTsFl58FIcew0neCPwcU/JyE46Lyg 8uupf7fpGQiaWZJfLEYQ0iXlShGOCOxPpJWgx6+iNKLuBORfG5z9+ozjbITPTcWG8Hp+ krp3MjMp6k/F0pZwOXtdRZPjpcC9Nm+ia4KgnZ9oLej4ik6gd92kTLPwNqBbKFbK3zA5 B9vR9YaYjXCmZHFwxIvqh6hEpiNTXSDXUsKDBpLApQYr5+dm/rhtWB/el9ryHg6pZMAI CbS9EPvPMgf2ILbU+iFK2S/kxe2X4eyXHiBnQjBNkmTdJFgT+3hcKhAMd9EtUZ2izmPG 2tew== 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=6JZKTL3cv5f+QsuwZswDwzrYuKZX5rkh1eIr4Zfx2fE=; b=AkIKMNbzZhMDNxfC3Q/HxOQF8tFQah7A8Gna6wW/odk5gXagH7BvALLeEN8jvB/5tI +WuIkVxaGyxxwVej9phgdVCAegfNZsZjplWFRfWJtCNhM6kNi/21FnQs1L0JqngJcnsU qew2CDa9S0xrLn/HUK1yvAKq6rlAaiC/oD/XJfpX0KGqTezRS8JXOzcTTdde2KZwfuzm 5oBYmzYFuyjH8Y0ZYj+zXeJ2g4Y0q5v0rhaEwwIyMRfZw7dy97z3PuBrAFIzyFayiJlK 8Y5uCjjUHzcb1RwddvV1/WIiQya4t3DN+D3nti5mBwzgWlLEJ1U0Dj2YP3Dfuq2nmtp4 KyKw== X-Gm-Message-State: AOAM531OUwnID3zElPC+L9EJwI2c+RR1UVyUuG98vvRWMI0wk85VvKfV cr/Gw1MW3105mJT4baSZZ6H1f4MN1zv3WVt8EnI= X-Google-Smtp-Source: ABdhPJx1YGkGp7cqKP4eWzC8MMNMuq4xIKNrPn1tsOPZo78IMlccqylVp5+hUcgOYd8xYJ5Qbwkysj1kalvbYUi0TXY= X-Received: from samitolvanen1.mtv.corp.google.com ([2620:15c:201:2:c86b:8269:af92:55a]) (user=samitolvanen job=sendgmr) by 2002:a25:4ce:: with SMTP id 197mr15054589ybe.462.1615510177158; Thu, 11 Mar 2021 16:49:37 -0800 (PST) Date: Thu, 11 Mar 2021 16:49:11 -0800 In-Reply-To: <20210312004919.669614-1-samitolvanen@google.com> Message-Id: <20210312004919.669614-10-samitolvanen@google.com> Mime-Version: 1.0 References: <20210312004919.669614-1-samitolvanen@google.com> X-Mailer: git-send-email 2.31.0.rc2.261.g7f71774620-goog Subject: [PATCH 09/17] lib/list_sort: fix function type mismatches From: Sami Tolvanen To: Kees Cook Cc: Nathan Chancellor , Nick Desaulniers , Masahiro Yamada , Will Deacon , Jessica Yu , Arnd Bergmann , Tejun Heo , 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: linux-pci@vger.kernel.org Casting the comparison function to a different type trips indirect call Control-Flow Integrity (CFI) checking. Remove the additional consts from cmp_func, and the now unneeded casts. Fixes: 043b3f7b6388 ("lib/list_sort: simplify and remove MAX_LIST_LENGTH_BITS") Signed-off-by: Sami Tolvanen Reviewed-by: Kees Cook --- lib/list_sort.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/lib/list_sort.c b/lib/list_sort.c index 52f0c258c895..b14accf4ef83 100644 --- a/lib/list_sort.c +++ b/lib/list_sort.c @@ -8,7 +8,7 @@ #include typedef int __attribute__((nonnull(2,3))) (*cmp_func)(void *, - struct list_head const *, struct list_head const *); + struct list_head *, struct list_head *); /* * Returns a list organized in an intermediate format suited @@ -227,7 +227,7 @@ void list_sort(void *priv, struct list_head *head, if (likely(bits)) { struct list_head *a = *tail, *b = a->prev; - a = merge(priv, (cmp_func)cmp, b, a); + a = merge(priv, cmp, b, a); /* Install the merged result in place of the inputs */ a->prev = b->prev; *tail = a; @@ -249,10 +249,10 @@ void list_sort(void *priv, struct list_head *head, if (!next) break; - list = merge(priv, (cmp_func)cmp, pending, list); + list = merge(priv, cmp, pending, list); pending = next; } /* The final merge, rebuilding prev links */ - merge_final(priv, (cmp_func)cmp, head, pending, list); + merge_final(priv, cmp, head, pending, list); } EXPORT_SYMBOL(list_sort);