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=-5.4 required=3.0 tests=FROM_LOCAL_HEX, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED 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 7EB0EC432C3 for ; Sat, 30 Nov 2019 07:19:10 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 1453F2072C for ; Sat, 30 Nov 2019 07:19:09 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1725821AbfK3HTJ (ORCPT ); Sat, 30 Nov 2019 02:19:09 -0500 Received: from mail-io1-f72.google.com ([209.85.166.72]:39445 "EHLO mail-io1-f72.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725298AbfK3HTJ (ORCPT ); Sat, 30 Nov 2019 02:19:09 -0500 Received: by mail-io1-f72.google.com with SMTP id u13so19416335iol.6 for ; Fri, 29 Nov 2019 23:19:08 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:date:message-id:subject:from:to; bh=Iszxj3xslkgFiHBpTht8Zqpoj8q3iHoILKi1CRIqeFo=; b=sW0wOnfLKT64fWmyxvUFh+pVtq7Fs4XkN6+MmemCtCD9kfuClJqPoV+PcdF4GSzCAx Djr8MX0CvBqkLlsucJCetDhKhm5S1R0tXv1ZwGLM95LcQmDqOcxVVub8/oIKKHPIS2kw UOPJykZ+i6AGXc0Du+32B9hnhLygyaqfAci0KfrY6oOwNyhD+BN0IlwGdBWxKKoPadgz F9zKsMDCPFgzx1FHC80uOLR2OOSXxgQO0PtDPpc46VH4Clr/dJA+b3T1hYAf0daVO1ch eQG60HLBFxa7u8f3UTQ09w5og5IukxNssGPMsRUFLhJDT6CyK/WZjUe4SGTyiMIUBT/X Gqig== X-Gm-Message-State: APjAAAV60z8g05fnrFe+D00YRxiRKbMfNHGDw7KMgP8FB+Uvqtqx/ibX RGZ9hQF2bripHF/4KCiZuVmx2fENBIXNFG2d1WRZtE7yGkta X-Google-Smtp-Source: APXvYqxMt060BD8gSa++k51h6Fp7squipmwrA4vm7Riv4aIzuKEn/9cvlou91jaqXCGEVS2ftXaKCqBjw7WzXdD6/yYNsXYosfFh MIME-Version: 1.0 X-Received: by 2002:a6b:9302:: with SMTP id v2mr36196070iod.12.1575098348190; Fri, 29 Nov 2019 23:19:08 -0800 (PST) Date: Fri, 29 Nov 2019 23:19:08 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <00000000000087c51905988b297b@google.com> Subject: KASAN: use-after-free Read in xlog_alloc_log (2) From: syzbot To: darrick.wong@oracle.com, linux-kernel@vger.kernel.org, linux-xfs@vger.kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8"; format=flowed; delsp=yes Sender: linux-xfs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-xfs@vger.kernel.org Hello, syzbot found the following crash on: HEAD commit: 81b6b964 Merge branch 'master' of git://git.kernel.org/pub.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=13b27696e00000 kernel config: https://syzkaller.appspot.com/x/.config?x=773597fe8d7cb41a dashboard link: https://syzkaller.appspot.com/bug?extid=c732f8644185de340492 compiler: gcc (GCC) 9.0.0 20181231 (experimental) Unfortunately, I don't have any reproducer for this crash yet. IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+c732f8644185de340492@syzkaller.appspotmail.com ================================================================== BUG: KASAN: use-after-free in xlog_alloc_log+0x1398/0x14b0 fs/xfs/xfs_log.c:1495 Read of size 8 at addr ffff888068139890 by task syz-executor.3/32544 CPU: 0 PID: 32544 Comm: syz-executor.3 Not tainted 5.4.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x197/0x210 lib/dump_stack.c:118 print_address_description.constprop.0.cold+0xd4/0x30b mm/kasan/report.c:374 __kasan_report.cold+0x1b/0x41 mm/kasan/report.c:506 kasan_report+0x12/0x20 mm/kasan/common.c:634 __asan_report_load8_noabort+0x14/0x20 mm/kasan/generic_report.c:132 xlog_alloc_log+0x1398/0x14b0 fs/xfs/xfs_log.c:1495 xfs_log_mount+0xdc/0x780 fs/xfs/xfs_log.c:599 xfs_mountfs+0xdb9/0x1be0 fs/xfs/xfs_mount.c:811 xfs_fs_fill_super+0xd24/0x1750 fs/xfs/xfs_super.c:1732 mount_bdev+0x304/0x3c0 fs/super.c:1415 xfs_fs_mount+0x35/0x40 fs/xfs/xfs_super.c:1806 legacy_get_tree+0x108/0x220 fs/fs_context.c:647 vfs_get_tree+0x8e/0x300 fs/super.c:1545 do_new_mount fs/namespace.c:2822 [inline] do_mount+0x135a/0x1b50 fs/namespace.c:3142 ksys_mount+0xdb/0x150 fs/namespace.c:3351 __do_sys_mount fs/namespace.c:3365 [inline] __se_sys_mount fs/namespace.c:3362 [inline] __x64_sys_mount+0xbe/0x150 fs/namespace.c:3362 do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45d0ca Code: b8 a6 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 4d 8c fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 2a 8c fb ff c3 66 0f 1f 84 00 00 00 00 00 RSP: 002b:00007f525b430a88 EFLAGS: 00000206 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007f525b430b40 RCX: 000000000045d0ca RDX: 00007f525b430ae0 RSI: 0000000020000100 RDI: 00007f525b430b00 RBP: 0000000000000001 R08: 00007f525b430b40 R09: 00007f525b430ae0 R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000004 R13: 00000000004ca258 R14: 00000000004e2870 R15: 00000000ffffffff Allocated by task 32544: save_stack+0x23/0x90 mm/kasan/common.c:69 set_track mm/kasan/common.c:77 [inline] __kasan_kmalloc mm/kasan/common.c:510 [inline] __kasan_kmalloc.constprop.0+0xcf/0xe0 mm/kasan/common.c:483 kasan_kmalloc+0x9/0x10 mm/kasan/common.c:524 __do_kmalloc mm/slab.c:3655 [inline] __kmalloc+0x163/0x770 mm/slab.c:3664 kmalloc include/linux/slab.h:561 [inline] kmem_alloc+0x15b/0x4d0 fs/xfs/kmem.c:21 kmem_zalloc fs/xfs/kmem.h:68 [inline] xlog_alloc_log+0xcce/0x14b0 fs/xfs/xfs_log.c:1437 xfs_log_mount+0xdc/0x780 fs/xfs/xfs_log.c:599 xfs_mountfs+0xdb9/0x1be0 fs/xfs/xfs_mount.c:811 xfs_fs_fill_super+0xd24/0x1750 fs/xfs/xfs_super.c:1732 mount_bdev+0x304/0x3c0 fs/super.c:1415 xfs_fs_mount+0x35/0x40 fs/xfs/xfs_super.c:1806 legacy_get_tree+0x108/0x220 fs/fs_context.c:647 vfs_get_tree+0x8e/0x300 fs/super.c:1545 do_new_mount fs/namespace.c:2822 [inline] do_mount+0x135a/0x1b50 fs/namespace.c:3142 ksys_mount+0xdb/0x150 fs/namespace.c:3351 __do_sys_mount fs/namespace.c:3365 [inline] __se_sys_mount fs/namespace.c:3362 [inline] __x64_sys_mount+0xbe/0x150 fs/namespace.c:3362 do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 32544: save_stack+0x23/0x90 mm/kasan/common.c:69 set_track mm/kasan/common.c:77 [inline] kasan_set_free_info mm/kasan/common.c:332 [inline] __kasan_slab_free+0x102/0x150 mm/kasan/common.c:471 kasan_slab_free+0xe/0x10 mm/kasan/common.c:480 __cache_free mm/slab.c:3425 [inline] kfree+0x10a/0x2c0 mm/slab.c:3756 kvfree+0x61/0x70 mm/util.c:593 kmem_free fs/xfs/kmem.h:61 [inline] xlog_alloc_log+0xeb5/0x14b0 fs/xfs/xfs_log.c:1497 xfs_log_mount+0xdc/0x780 fs/xfs/xfs_log.c:599 xfs_mountfs+0xdb9/0x1be0 fs/xfs/xfs_mount.c:811 xfs_fs_fill_super+0xd24/0x1750 fs/xfs/xfs_super.c:1732 mount_bdev+0x304/0x3c0 fs/super.c:1415 xfs_fs_mount+0x35/0x40 fs/xfs/xfs_super.c:1806 legacy_get_tree+0x108/0x220 fs/fs_context.c:647 vfs_get_tree+0x8e/0x300 fs/super.c:1545 do_new_mount fs/namespace.c:2822 [inline] do_mount+0x135a/0x1b50 fs/namespace.c:3142 ksys_mount+0xdb/0x150 fs/namespace.c:3351 __do_sys_mount fs/namespace.c:3365 [inline] __se_sys_mount fs/namespace.c:3362 [inline] __x64_sys_mount+0xbe/0x150 fs/namespace.c:3362 do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe The buggy address belongs to the object at ffff888068139800 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 144 bytes inside of 1024-byte region [ffff888068139800, ffff888068139c00) The buggy address belongs to the page: page:ffffea0001a04e40 refcount:1 mapcount:0 mapping:ffff8880aa400c40 index:0x0 raw: 00fffe0000000200 ffffea0002728148 ffffea00015604c8 ffff8880aa400c40 raw: 0000000000000000 ffff888068139000 0000000100000002 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff888068139780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888068139800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb > ffff888068139880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888068139900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888068139980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== --- 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.