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=-0.7 required=3.0 tests=FROM_LOCAL_HEX, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,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 48475C43381 for ; Sun, 3 Mar 2019 10:22:08 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 0E8FA20863 for ; Sun, 3 Mar 2019 10:22:07 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726095AbfCCKWG (ORCPT ); Sun, 3 Mar 2019 05:22:06 -0500 Received: from mail-io1-f70.google.com ([209.85.166.70]:53287 "EHLO mail-io1-f70.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725999AbfCCKWG (ORCPT ); Sun, 3 Mar 2019 05:22:06 -0500 Received: by mail-io1-f70.google.com with SMTP id z14so2082588ioh.20 for ; Sun, 03 Mar 2019 02:22:05 -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=xZ9s5q2OITHgByZHYni8Oqg5Vb0fLq1SNy5Td6ttjYY=; b=WwzFrqwSb5uUb/eHYAKe+pUr8bTYDImCY3EPxmG6ofzKKOxYmRwskq0zEZNK5avYTu k26MAK9KVp9mwurt4SlF74i7jezQa5nieJjjZpdpINgTDvIQjwJzyy1aAnmRN3J2WVND BHSMtsCiBjouU91uMk0Xipk92xZdeb5lMrjf/g6JQHw3QiUFvvSUvuVj5xRsNP6PI16R G2Gyl7qGH6l+XRPhI7Qy666wFGD4HTrObhO37af4sCQSjUD5ew1M6YaqIR+KPgNktm6a XrsKZJQcTIcgSwlF0Sd0hTNS+lgQb6SNcZFwmHUwCwMmggIVJhgxNrlZ2r6n2Hvc8JFh 70qQ== X-Gm-Message-State: APjAAAX8CfPok08nwk+Qm4O3EYY6Oopkv0Hu3C6mzr+4vwK7HI76+Yjw kfzo5hDenKGgz6XjFqG4pwK8a6Es6+himPAKHYlY/8AY5Tnt X-Google-Smtp-Source: APXvYqxhj6TDZt1iSZq+dQwfb6212duoSOPaFVLz1KBuSJMZbRir+iKJNIhTpMDOqtA+CnOqqTpkedAH5QRz6K1GZLib6GjeuL0w MIME-Version: 1.0 X-Received: by 2002:a6b:f717:: with SMTP id k23mr8473129iog.28.1551608524803; Sun, 03 Mar 2019 02:22:04 -0800 (PST) Date: Sun, 03 Mar 2019 02:22:04 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <000000000000f39c7b05832e0219@google.com> Subject: KASAN: use-after-free Read in unix_dgram_poll From: syzbot To: davem@davemloft.net, jbaron@akamai.com, kgraul@linux.ibm.com, ktkhai@virtuozzo.com, kyeongdon.kim@lge.com, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, pabeni@redhat.com, syzkaller-bugs@googlegroups.com, viro@zeniv.linux.org.uk, xiyou.wangcong@gmail.com Content-Type: text/plain; charset="UTF-8"; format=flowed; delsp=yes Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hello, syzbot found the following crash on: HEAD commit: 7d762d69145a afs: Fix manually set volume location server .. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=131d832ac00000 kernel config: https://syzkaller.appspot.com/x/.config?x=b76ec970784287c dashboard link: https://syzkaller.appspot.com/bug?extid=503d4cc169fcec1cb18c compiler: gcc (GCC) 9.0.0 20181231 (experimental) syz repro: https://syzkaller.appspot.com/x/repro.syz?x=11934262c00000 IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+503d4cc169fcec1cb18c@syzkaller.appspotmail.com ================================================================== BUG: KASAN: use-after-free in unix_dgram_poll+0x5e1/0x690 net/unix/af_unix.c:2695 Read of size 4 at addr ffff88809292aae0 by task syz-executor.1/18946 CPU: 0 PID: 18946 Comm: syz-executor.1 Not tainted 5.0.0-rc8+ #88 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+0x172/0x1f0 lib/dump_stack.c:113 print_address_description.cold+0x7c/0x20d mm/kasan/report.c:187 kasan_report.cold+0x1b/0x40 mm/kasan/report.c:317 __asan_report_load4_noabort+0x14/0x20 mm/kasan/generic_report.c:134 unix_dgram_poll+0x5e1/0x690 net/unix/af_unix.c:2695 sock_poll+0x291/0x340 net/socket.c:1127 vfs_poll include/linux/poll.h:86 [inline] aio_poll fs/aio.c:1766 [inline] __io_submit_one fs/aio.c:1876 [inline] io_submit_one+0xe3e/0x1cf0 fs/aio.c:1909 __do_sys_io_submit fs/aio.c:1954 [inline] __se_sys_io_submit fs/aio.c:1924 [inline] __x64_sys_io_submit+0x1bd/0x580 fs/aio.c:1924 ? 0xffffffff81000000 do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x457e29 Code: ad b8 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 7b b8 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fd43ca93c78 EFLAGS: 00000246 ORIG_RAX: 00000000000000d1 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000457e29 RDX: 0000000020000600 RSI: 1ffffffffffffd70 RDI: 00007fd43ca73000 RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fd43ca946d4 R13: 00000000004bf02f R14: 00000000004d09b0 R15: 00000000ffffffff Allocated by task 18946: save_stack+0x45/0xd0 mm/kasan/common.c:73 set_track mm/kasan/common.c:85 [inline] __kasan_kmalloc mm/kasan/common.c:495 [inline] __kasan_kmalloc.constprop.0+0xcf/0xe0 mm/kasan/common.c:468 kasan_slab_alloc+0xf/0x20 mm/kasan/common.c:503 slab_post_alloc_hook mm/slab.h:440 [inline] slab_alloc mm/slab.c:3388 [inline] kmem_cache_alloc+0x11a/0x6f0 mm/slab.c:3548 sk_prot_alloc+0x67/0x2e0 net/core/sock.c:1471 sk_alloc+0x39/0xf70 net/core/sock.c:1531 unix_create1+0xc3/0x530 net/unix/af_unix.c:764 unix_create+0x103/0x1e0 net/unix/af_unix.c:825 __sock_create+0x3e6/0x750 net/socket.c:1275 sock_create net/socket.c:1315 [inline] __sys_socketpair+0x272/0x5e0 net/socket.c:1407 __do_sys_socketpair net/socket.c:1456 [inline] __se_sys_socketpair net/socket.c:1453 [inline] __x64_sys_socketpair+0x97/0xf0 net/socket.c:1453 do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 18944: save_stack+0x45/0xd0 mm/kasan/common.c:73 set_track mm/kasan/common.c:85 [inline] __kasan_slab_free+0x102/0x150 mm/kasan/common.c:457 kasan_slab_free+0xe/0x10 mm/kasan/common.c:465 __cache_free mm/slab.c:3494 [inline] kmem_cache_free+0x86/0x260 mm/slab.c:3754 sk_prot_free net/core/sock.c:1512 [inline] __sk_destruct+0x4b6/0x6d0 net/core/sock.c:1596 sk_destruct+0x7b/0x90 net/core/sock.c:1604 __sk_free+0xce/0x300 net/core/sock.c:1615 sk_free+0x42/0x50 net/core/sock.c:1626 sock_put include/net/sock.h:1707 [inline] unix_release_sock+0x921/0xbb0 net/unix/af_unix.c:573 unix_release+0x44/0x90 net/unix/af_unix.c:835 __sock_release+0xd3/0x250 net/socket.c:579 sock_close+0x1b/0x30 net/socket.c:1139 __fput+0x2df/0x8d0 fs/file_table.c:278 ____fput+0x16/0x20 fs/file_table.c:309 task_work_run+0x14a/0x1c0 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:188 [inline] exit_to_usermode_loop+0x273/0x2c0 arch/x86/entry/common.c:166 prepare_exit_to_usermode arch/x86/entry/common.c:197 [inline] syscall_return_slowpath arch/x86/entry/common.c:268 [inline] do_syscall_64+0x52d/0x610 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe The buggy address belongs to the object at ffff88809292a740 which belongs to the cache UNIX(49:syz1) of size 1728 The buggy address is located 928 bytes inside of 1728-byte region [ffff88809292a740, ffff88809292ae00) The buggy address belongs to the page: page:ffffea00024a4a80 count:1 mapcount:0 mapping:ffff8880920c0800 index:0x0 flags: 0x1fffc0000000200(slab) raw: 01fffc0000000200 ffffea00028223c8 ffffea0002581248 ffff8880920c0800 raw: 0000000000000000 ffff88809292a000 0000000100000002 ffff8880a9718ec0 page dumped because: kasan: bad access detected page->mem_cgroup:ffff8880a9718ec0 Memory state around the buggy address: ffff88809292a980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88809292aa00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb > ffff88809292aa80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88809292ab00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88809292ab80: 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#bug-status-tracking for how to communicate with syzbot. syzbot can test patches for this bug, for details see: https://goo.gl/tpsmEJ#testing-patches