From patchwork Thu Jun 3 19:59:15 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: =?utf-8?q?Andr=C3=A9_Almeida?= X-Patchwork-Id: 454394 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=-16.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, UNPARSEABLE_RELAY, USER_AGENT_GIT 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 23D64C47099 for ; Thu, 3 Jun 2021 20:00:52 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 0DFCE6139A for ; Thu, 3 Jun 2021 20:00:52 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230178AbhFCUCg (ORCPT ); Thu, 3 Jun 2021 16:02:36 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:60010 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230175AbhFCUCe (ORCPT ); Thu, 3 Jun 2021 16:02:34 -0400 Received: from bhuna.collabora.co.uk (bhuna.collabora.co.uk [IPv6:2a00:1098:0:82:1000:25:2eeb:e3e3]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 85570C061756; Thu, 3 Jun 2021 13:00:49 -0700 (PDT) Received: from [127.0.0.1] (localhost [127.0.0.1]) (Authenticated sender: tonyk) with ESMTPSA id EC0F01F4350E From: =?utf-8?q?Andr=C3=A9_Almeida?= To: Thomas Gleixner , Ingo Molnar , Peter Zijlstra , Darren Hart , linux-kernel@vger.kernel.org, Steven Rostedt , Sebastian Andrzej Siewior Cc: kernel@collabora.com, krisman@collabora.com, pgriffais@valvesoftware.com, z.figura12@gmail.com, joel@joelfernandes.org, malteskarupke@fastmail.fm, linux-api@vger.kernel.org, fweimer@redhat.com, libc-alpha@sourceware.org, linux-kselftest@vger.kernel.org, shuah@kernel.org, acme@kernel.org, corbet@lwn.net, Peter Oskolkov , Andrey Semashev , Davidlohr Bueso , =?utf-8?q?Andr=C3=A9_Almeida?= Subject: [PATCH v4 06/15] futex2: Add compatibility entry point for x86_x32 ABI Date: Thu, 3 Jun 2021 16:59:15 -0300 Message-Id: <20210603195924.361327-7-andrealmeid@collabora.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210603195924.361327-1-andrealmeid@collabora.com> References: <20210603195924.361327-1-andrealmeid@collabora.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-kselftest@vger.kernel.org New syscalls should use the same entry point for x86_64 and x86_x32 paths. Add a wrapper for x32 calls to use parse functions that assumes 32bit pointers. Signed-off-by: André Almeida --- kernel/futex2.c | 36 +++++++++++++++++++++++++++++++++++- 1 file changed, 35 insertions(+), 1 deletion(-) diff --git a/kernel/futex2.c b/kernel/futex2.c index 1e97e5f2e793..5fd0b3d73b53 100644 --- a/kernel/futex2.c +++ b/kernel/futex2.c @@ -23,6 +23,10 @@ #include #include +#ifdef CONFIG_X86_64 +#include +#endif + /** * struct futex_key - Components to build unique key for a futex * @pointer: Pointer to current->mm or inode's UUID for file backed futexes @@ -910,7 +914,16 @@ SYSCALL_DEFINE4(futex_waitv, struct futex_waitv __user *, waiters, futexv->hint = false; futexv->task = current; - ret = futex_parse_waitv(futexv, waiters, nr_futexes); +#ifdef CONFIG_X86_X32_ABI + if (in_x32_syscall()) { + ret = compat_futex_parse_waitv(futexv, (struct compat_futex_waitv *)waiters, + nr_futexes); + } else +#endif + { + ret = futex_parse_waitv(futexv, waiters, nr_futexes); + } + if (!ret) ret = __futex_waitv(futexv, nr_futexes, timo, flags); @@ -1215,6 +1228,27 @@ SYSCALL_DEFINE6(futex_requeue, struct futex_requeue __user *, uaddr1, if (ret) return ret; +#ifdef CONFIG_X86_X32_ABI + if (in_x32_syscall()) { + ret = compat_futex_parse_requeue(&rq1, (struct compat_futex_requeue *)uaddr1); + if (ret) + return ret; + + ret = compat_futex_parse_requeue(&rq2, (struct compat_futex_requeue *)uaddr2); + if (ret) + return ret; + } else +#endif + { + ret = futex_parse_requeue(&rq1, uaddr1); + if (ret) + return ret; + + ret = futex_parse_requeue(&rq2, uaddr2); + if (ret) + return ret; + } + return __futex_requeue(rq1, rq2, nr_wake, nr_requeue, cmpval); }