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[2620:137:e000::1:20]) by mx.google.com with ESMTP id cm7-20020a170907938700b008b14042fa1bsi1418702ejc.255.2023.02.16.01.27.54; Thu, 16 Feb 2023 01:28:17 -0800 (PST) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; Authentication-Results: mx.google.com; dkim=pass header.i=@collabora.com header.s=mail header.b=hXppeNF6; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=REJECT sp=REJECT dis=NONE) header.from=collabora.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229882AbjBPJSI (ORCPT + 99 others); Thu, 16 Feb 2023 04:18:08 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:32854 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229800AbjBPJSD (ORCPT ); Thu, 16 Feb 2023 04:18:03 -0500 Received: from madras.collabora.co.uk (madras.collabora.co.uk [46.235.227.172]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id A59F82068A for ; Thu, 16 Feb 2023 01:18:01 -0800 (PST) Received: from localhost.localdomain (unknown [39.45.217.110]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) (Authenticated sender: usama.anjum) by madras.collabora.co.uk (Postfix) with ESMTPSA id B6820660219B; Thu, 16 Feb 2023 09:17:58 +0000 (GMT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=collabora.com; s=mail; t=1676539080; bh=eN35qv1LQnqiL94LOpdwsRPxsfQxNRRB3+34BVt+3/g=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=hXppeNF6RgBlcVGgaFAGBHmpAy9Zonunn8zH1SUsH0SbgvHwyDQ6xVh8Q/nxGdKFs 495IqxX+srlyIzYUvEvCyQortt7XmNpJJD/9gIdbyZ9xQi17ioi30ymeUajEeWYC83 4NxxHC/EeJnyJ4XK54d7AW+2IbrnTU/NcELTXRrHUQhgFQDztv+lMzZJTkp6yUQXhI vhoIewxGXKTkkD1izP+GxMFpAbSmMDPfm3RIoIdfZEQDsAFclK60r940C6p4XqQx8T cVTO2CKICrClksWOIx5b2asP1noUwXIORO3Y9rYczrtt8n9apz+wXM8QatF6yS+gI3 AIGihfHZqYJfg== From: Muhammad Usama Anjum To: peterx@redhat.com, david@redhat.com, Andrew Morton Cc: Muhammad Usama Anjum , kernel@collabora.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: [PATCH v4 2/2] mm/userfaultfd: add VM_WARN_ONCE() Date: Thu, 16 Feb 2023 14:16:56 +0500 Message-Id: <20230216091656.2045471-2-usama.anjum@collabora.com> X-Mailer: git-send-email 2.39.1 In-Reply-To: <20230216091656.2045471-1-usama.anjum@collabora.com> References: <20230216091656.2045471-1-usama.anjum@collabora.com> MIME-Version: 1.0 X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1757979290465422269?= X-GMAIL-MSGID: =?utf-8?q?1757979290465422269?= Add VM_WARN_ONCE() to uffd_wp_range() to detect range (start, len) abuse. Signed-off-by: Muhammad Usama Anjum --- mm/userfaultfd.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/mm/userfaultfd.c b/mm/userfaultfd.c index 77c5839e591c..d89ed44d2668 100644 --- a/mm/userfaultfd.c +++ b/mm/userfaultfd.c @@ -717,6 +717,8 @@ long uffd_wp_range(struct mm_struct *dst_mm, struct vm_area_struct *dst_vma, struct mmu_gather tlb; long ret; + VM_WARN_ONCE(start < dst_vma->vm_start || start + len > dst_vma->vm_end, + "The address range exceeds VMA boundary.\n"); if (enable_wp) mm_cp_flags = MM_CP_UFFD_WP; else