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=-6.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED 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 D2DB0C433E2 for ; Fri, 5 Jun 2020 04:24:08 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id ACADD207D3 for ; Fri, 5 Jun 2020 04:24:08 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1591331048; bh=Ger2JKf4foukIoxJhsp2lpcdnsKngWBWA02v1OQp51Y=; h=Date:From:To:Cc:Subject:References:In-Reply-To:List-ID:From; b=jlt+Nixjg1w0DiMtlypyt0rcYvxIRe8c9/RtRxRbijhuXKSe3TJVVbdPPx3U0X1S7 y2yeFPNUbYKrm4h3nWxIamZIG6UEBf7CSzCps2eto8xsECxM5Jwr4s33AQ6LBBpCrX er8BhLJG+in6uqF28FH88nSowxxHBJ33YbLB0adI= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726090AbgFEEYF (ORCPT ); Fri, 5 Jun 2020 00:24:05 -0400 Received: from mail.kernel.org ([198.145.29.99]:56694 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726039AbgFEEYE (ORCPT ); Fri, 5 Jun 2020 00:24:04 -0400 Received: from sol.localdomain (c-107-3-166-239.hsd1.ca.comcast.net [107.3.166.239]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id C98CA206E6; Fri, 5 Jun 2020 04:24:03 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1591331044; bh=Ger2JKf4foukIoxJhsp2lpcdnsKngWBWA02v1OQp51Y=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=0wRsVBPYDfhuBPXJhNEprgX7yrwQg0lkOBlGoz4O9jEC+lVNlLQWhfMSciuYkRSKF tR2wZxyLj9N1kziXCwugwlLQRH47af8NFACLXOevvhB6Wi/eonfPM8oDsgehwYXdGg XThOmBu1ey/i1g9+k9IDIgZUxKvQoijjfHVxPMfY= Date: Thu, 4 Jun 2020 21:24:02 -0700 From: Eric Biggers To: kvm@vger.kernel.org Cc: syzbot , linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com, viro@zeniv.linux.org.uk Subject: Re: memory leak in do_eventfd Message-ID: <20200605042402.GO2667@sol.localdomain> References: <0000000000001daa8d05a61e3440@google.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <0000000000001daa8d05a61e3440@google.com> Sender: linux-fsdevel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org [+Cc kvm mailing list] On Wed, May 20, 2020 at 06:12:17PM -0700, syzbot wrote: > Hello, > > syzbot found the following crash on: > > HEAD commit: 5a9ffb95 Merge tag '5.7-rc5-smb3-fixes' of git://git.samba.. > git tree: upstream > console output: https://syzkaller.appspot.com/x/log.txt?x=10b72a02100000 > kernel config: https://syzkaller.appspot.com/x/.config?x=f8295ae5b3f8268d > dashboard link: https://syzkaller.appspot.com/bug?extid=f196caa45793d6374707 > compiler: gcc (GCC) 9.0.0 20181231 (experimental) > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=17585b76100000 > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=12500a02100000 > > IMPORTANT: if you fix the bug, please add the following tag to the commit: > Reported-by: syzbot+f196caa45793d6374707@syzkaller.appspotmail.com > > BUG: memory leak > unreferenced object 0xffff888117169ac0 (size 64): > comm "syz-executor012", pid 6609, jiffies 4294942172 (age 13.720s) > hex dump (first 32 bytes): > 01 00 00 00 ff ff ff ff 00 00 00 00 00 c9 ff ff ................ > d0 9a 16 17 81 88 ff ff d0 9a 16 17 81 88 ff ff ................ > backtrace: > [<00000000351bb234>] kmalloc include/linux/slab.h:555 [inline] > [<00000000351bb234>] do_eventfd+0x35/0xf0 fs/eventfd.c:418 > [<00000000c2f69a77>] __do_sys_eventfd fs/eventfd.c:443 [inline] > [<00000000c2f69a77>] __se_sys_eventfd fs/eventfd.c:441 [inline] > [<00000000c2f69a77>] __x64_sys_eventfd+0x14/0x20 fs/eventfd.c:441 > [<0000000086d6f989>] do_syscall_64+0x6e/0x220 arch/x86/entry/common.c:295 > [<000000006c5bcb63>] entry_SYSCALL_64_after_hwframe+0x44/0xa9 > > BUG: memory leak > unreferenced object 0xffff888117169100 (size 64): > comm "syz-executor012", pid 6609, jiffies 4294942172 (age 13.720s) > hex dump (first 32 bytes): > e8 99 dd 00 00 c9 ff ff e8 99 dd 00 00 c9 ff ff ................ > 00 00 00 20 00 00 00 00 00 00 00 00 00 00 00 00 ... ............ > backtrace: > [<00000000436d2955>] kmalloc include/linux/slab.h:555 [inline] > [<00000000436d2955>] kzalloc include/linux/slab.h:669 [inline] > [<00000000436d2955>] kvm_assign_ioeventfd_idx+0x4f/0x270 arch/x86/kvm/../../../virt/kvm/eventfd.c:798 > [<00000000e89390cc>] kvm_assign_ioeventfd arch/x86/kvm/../../../virt/kvm/eventfd.c:934 [inline] > [<00000000e89390cc>] kvm_ioeventfd+0xbb/0x194 arch/x86/kvm/../../../virt/kvm/eventfd.c:961 > [<00000000ba9f6732>] kvm_vm_ioctl+0x1e6/0x1030 arch/x86/kvm/../../../virt/kvm/kvm_main.c:3670 > [<000000005da94937>] vfs_ioctl fs/ioctl.c:47 [inline] > [<000000005da94937>] ksys_ioctl+0xa6/0xd0 fs/ioctl.c:771 > [<00000000a583d097>] __do_sys_ioctl fs/ioctl.c:780 [inline] > [<00000000a583d097>] __se_sys_ioctl fs/ioctl.c:778 [inline] > [<00000000a583d097>] __x64_sys_ioctl+0x1a/0x20 fs/ioctl.c:778 > [<0000000086d6f989>] do_syscall_64+0x6e/0x220 arch/x86/entry/common.c:295 > [<000000006c5bcb63>] entry_SYSCALL_64_after_hwframe+0x44/0xa9 > > > > --- > This bug is generated by a bot. It may contain errors. > See https://goo.gl/tpsmEJ for more information about syzbot. > syzbot engineers can be reached at syzkaller@googlegroups.com. > > syzbot will keep track of this bug report. See: > https://goo.gl/tpsmEJ#status for how to communicate with syzbot. > syzbot can test patches for this bug, for details see: > https://goo.gl/tpsmEJ#testing-patches > > -- > You received this message because you are subscribed to the Google Groups "syzkaller-bugs" group. > To unsubscribe from this group and stop receiving emails from it, send an email to syzkaller-bugs+unsubscribe@googlegroups.com. > To view this discussion on the web visit https://groups.google.com/d/msgid/syzkaller-bugs/0000000000001daa8d05a61e3440%40google.com.