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 Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id 04BC1C43334 for ; Tue, 7 Jun 2022 19:27:33 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 711B36B0088; Tue, 7 Jun 2022 15:27:32 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 6C1F66B008A; Tue, 7 Jun 2022 15:27:32 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 5627E6B008C; Tue, 7 Jun 2022 15:27:32 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0017.hostedemail.com [216.40.44.17]) by kanga.kvack.org (Postfix) with ESMTP id 43E716B0088 for ; Tue, 7 Jun 2022 15:27:32 -0400 (EDT) Received: from smtpin12.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay13.hostedemail.com (Postfix) with ESMTP id EF67C6077B for ; Tue, 7 Jun 2022 19:27:31 +0000 (UTC) X-FDA: 79552423902.12.0A4B4FA Received: from casper.infradead.org (casper.infradead.org [90.155.50.34]) by imf24.hostedemail.com (Postfix) with ESMTP id 0974618005C for ; Tue, 7 Jun 2022 19:27:29 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=In-Reply-To:Content-Type:MIME-Version: References:Message-ID:Subject:Cc:To:From:Date:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=bjf+JB+wVxqKYyInjDis734wWz+kHKNkj5PzDHZNhCY=; b=mxldPOzI0bYYj/2pAoTFTm9amq sn5MLz64QAnytFq6wXehCPig00lmm86lbLq+wxD8+iRl8Xq6DI/aN52oBO7oDoy1Gy7jj6IFJcskF obq2f1BRzfcfZIAazBNrZh7R5OlSxjxWOIdVe8Vns47JRQNHhBfdBXn4NKZdRsfpdXsbLAHrenByn BXfbzDuc2dQ+f8KuS5svQEd3NDDj82SRB2nf0r8C/Hh8bMPAxWOsjh8OBrIV7dEVL9UIF1ZOujXX0 RQzOR3h8aOXwQdQTpCDn2Z20Nl81+LMX6nlKqiYxOtuLOPYeG+4OUug9vNzxvWNF9hB6ntpwwJ5os SWj9xVkg==; Received: from willy by casper.infradead.org with local (Exim 4.94.2 #2 (Red Hat Linux)) id 1nyerO-00Buo2-WF; Tue, 07 Jun 2022 19:27:27 +0000 Date: Tue, 7 Jun 2022 20:27:26 +0100 From: Matthew Wilcox To: syzbot Cc: akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, syzkaller-bugs@googlegroups.com Subject: Re: [syzbot] KASAN: stack-out-of-bounds Write in check_move_unevictable_pages Message-ID: References: <0000000000003fc46005e0db5390@google.com> <00000000000063ade705e0de053e@google.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <00000000000063ade705e0de053e@google.com> X-Stat-Signature: 53w5hpkw86bkcfyo4nkferwtqztjqoiy X-Rspam-User: Authentication-Results: imf24.hostedemail.com; dkim=pass header.d=infradead.org header.s=casper.20170209 header.b=mxldPOzI; dmarc=none; spf=none (imf24.hostedemail.com: domain of willy@infradead.org has no SPF policy when checking 90.155.50.34) smtp.mailfrom=willy@infradead.org X-Rspamd-Server: rspam09 X-Rspamd-Queue-Id: 0974618005C X-HE-Tag: 1654630049-581979 X-Bogosity: Ham, tests=bogofilter, spamicity=0.001600, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Tue, Jun 07, 2022 at 09:24:21AM -0700, syzbot wrote: > BUG: KASAN: vmalloc-out-of-bounds in folio_batch_add include/linux/pagevec.h:130 [inline] > BUG: KASAN: vmalloc-out-of-bounds in check_move_unevictable_pages+0x3f6/0x440 mm/vmscan.c:4857 Oh, I forgot to call folio_batch_init(), so ->nr contains some stack garbage and we index into hyperspace. I'll fix it up, thanks.