From patchwork Mon Feb 15 15:23:56 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: 12088373 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 6DDDEC43219 for ; Mon, 15 Feb 2021 15:26:44 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 44EA7600EF for ; Mon, 15 Feb 2021 15:26:44 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230461AbhBOP0k (ORCPT ); Mon, 15 Feb 2021 10:26:40 -0500 Received: from bhuna.collabora.co.uk ([46.235.227.227]:60150 "EHLO bhuna.collabora.co.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230260AbhBOPZn (ORCPT ); Mon, 15 Feb 2021 10:25:43 -0500 Received: from [127.0.0.1] (localhost [127.0.0.1]) (Authenticated sender: tonyk) with ESMTPSA id F10AE1F44F15 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, =?utf-8?q?Andr=C3=A9_Almeida?= Subject: [RFC PATCH 05/13] futex2: Add compatibility entry point for x86_x32 ABI Date: Mon, 15 Feb 2021 12:23:56 -0300 Message-Id: <20210215152404.250281-6-andrealmeid@collabora.com> X-Mailer: git-send-email 2.30.1 In-Reply-To: <20210215152404.250281-1-andrealmeid@collabora.com> References: <20210215152404.250281-1-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 | 42 +++++++++++++++++++++++++++++++++++------- 1 file changed, 35 insertions(+), 7 deletions(-) diff --git a/kernel/futex2.c b/kernel/futex2.c index bad8c183cf9f..8a8b45f98d3b 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 @@ -875,7 +879,16 @@ 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_set_timer_and_wait(futexv, nr_futexes, timo, flags); @@ -1181,13 +1194,28 @@ SYSCALL_DEFINE6(futex_requeue, struct futex_requeue __user *, uaddr1, if (flags) return -EINVAL; - ret = futex_parse_requeue(&rq1, uaddr1, &shared1); - if (ret) - return ret; +#ifdef CONFIG_X86_X32_ABI + if (in_x32_syscall()) { + ret = compat_futex_parse_requeue(&rq1, (struct compat_futex_requeue *)uaddr1, + &shared1); + if (ret) + return ret; - ret = futex_parse_requeue(&rq2, uaddr2, &shared2); - if (ret) - return ret; + ret = compat_futex_parse_requeue(&rq2, (struct compat_futex_requeue *)uaddr2, + &shared2); + if (ret) + return ret; + } else +#endif + { + ret = futex_parse_requeue(&rq1, uaddr1, &shared1); + if (ret) + return ret; + + ret = futex_parse_requeue(&rq2, uaddr2, &shared2); + if (ret) + return ret; + } return __futex_requeue(rq1, rq2, nr_wake, nr_requeue, cmpval, shared1, shared2); }