From mboxrd@z Thu Jan 1 00:00:00 1970 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=-13.1 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT 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 E407EC388F2 for ; Mon, 2 Nov 2020 12:32:29 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 8CBDF24124 for ; Mon, 2 Nov 2020 12:32:29 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1604320349; bh=12WjWXMOhRX8foDpdzTHQclpVL9hhg1uSfIq6xlUw6Q=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=a8HtwK4Kk/7r44ClcX890zScnhgFInxg/4fuL7MBO0j6wwRnxt/uCjsmVRIkjWezx 6ek+/+9h2/wJHJDg3dgs32l/nbP/hK5yI38D/umudki9yGSXZwvZ2OLo1I6rTtD3Xr NEW6BIxXK9R83fqi/jNv8JhqedPtNKAWt5Li775w= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728830AbgKBMc2 (ORCPT ); Mon, 2 Nov 2020 07:32:28 -0500 Received: from mail.kernel.org ([198.145.29.99]:43814 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728815AbgKBMcZ (ORCPT ); Mon, 2 Nov 2020 07:32:25 -0500 Received: from localhost.localdomain (unknown [192.30.34.233]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 591FE22273; Mon, 2 Nov 2020 12:32:20 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1604320344; bh=12WjWXMOhRX8foDpdzTHQclpVL9hhg1uSfIq6xlUw6Q=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=iS2BxigP0ePe7/drkx/OYH1vXm8CFknuPBmYey/ZJnNsk33tcUOlDQjpxE+iiPMmg j3OLiqcQxSlgSThLJ2R9K/cXyzAbhlzRuLbVwnU4yvenCXIbc490mRBibZnOmXqQJt uDCd6/EEDrie0cCv/M/LB28+ZbcZ2E3xbmnNwZKs= From: Arnd Bergmann To: linux-arch@vger.kernel.org Cc: Arnd Bergmann , Alexander Viro , Andrew Morton , Andy Lutomirski , Borislav Petkov , Brian Gerst , Christoph Hellwig , Eric Biederman , Ingo Molnar , "H . Peter Anvin" , Thomas Gleixner , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, kexec@lists.infradead.org Subject: [PATCH v2 2/4] mm: simplify compat_sys_move_pages Date: Mon, 2 Nov 2020 13:31:49 +0100 Message-Id: <20201102123151.2860165-3-arnd@kernel.org> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20201102123151.2860165-1-arnd@kernel.org> References: <20201102123151.2860165-1-arnd@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Arnd Bergmann The compat move_pages() implementation uses compat_alloc_user_space() for converting the pointer array. Moving the compat handling into the function itself is a bit simpler and lets us avoid the compat_alloc_user_space() call. Signed-off-by: Arnd Bergmann --- mm/migrate.c | 45 ++++++++++++++++++++++++++++++--------------- 1 file changed, 30 insertions(+), 15 deletions(-) diff --git a/mm/migrate.c b/mm/migrate.c index 5ca5842df5db..016e39809ca5 100644 --- a/mm/migrate.c +++ b/mm/migrate.c @@ -1830,6 +1830,23 @@ static void do_pages_stat_array(struct mm_struct *mm, unsigned long nr_pages, mmap_read_unlock(mm); } +static int put_compat_pages_array(const void __user *chunk_pages[], + const void __user * __user *pages, + unsigned long chunk_nr) +{ + compat_uptr_t __user *pages32 = (compat_uptr_t __user *)pages; + compat_uptr_t p; + int i; + + for (i = 0; i < chunk_nr; i++) { + if (get_user(p, pages32 + i)) + return -EFAULT; + chunk_pages[i] = compat_ptr(p); + } + + return 0; +} + /* * Determine the nodes of a user array of pages and store it in * a user array of status. @@ -1849,8 +1866,15 @@ static int do_pages_stat(struct mm_struct *mm, unsigned long nr_pages, if (chunk_nr > DO_PAGES_STAT_CHUNK_NR) chunk_nr = DO_PAGES_STAT_CHUNK_NR; - if (copy_from_user(chunk_pages, pages, chunk_nr * sizeof(*chunk_pages))) - break; + if (in_compat_syscall()) { + if (put_compat_pages_array(chunk_pages, pages, + chunk_nr)) + break; + } else { + if (copy_from_user(chunk_pages, pages, + chunk_nr * sizeof(*chunk_pages))) + break; + } do_pages_stat_array(mm, chunk_nr, chunk_pages, chunk_status); @@ -1955,23 +1979,14 @@ SYSCALL_DEFINE6(move_pages, pid_t, pid, unsigned long, nr_pages, #ifdef CONFIG_COMPAT COMPAT_SYSCALL_DEFINE6(move_pages, pid_t, pid, compat_ulong_t, nr_pages, - compat_uptr_t __user *, pages32, + compat_uptr_t __user *, pages, const int __user *, nodes, int __user *, status, int, flags) { - const void __user * __user *pages; - int i; - - pages = compat_alloc_user_space(nr_pages * sizeof(void *)); - for (i = 0; i < nr_pages; i++) { - compat_uptr_t p; - - if (get_user(p, pages32 + i) || - put_user(compat_ptr(p), pages + i)) - return -EFAULT; - } - return kernel_move_pages(pid, nr_pages, pages, nodes, status, flags); + return kernel_move_pages(pid, nr_pages, + (const void __user *__user *)pages, + nodes, status, flags); } #endif /* CONFIG_COMPAT */ -- 2.27.0