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=-0.4 required=3.0 tests=FROM_LOCAL_HEX, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED autolearn=no 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 076AFC433E0 for ; Tue, 16 Jun 2020 07:24:20 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id DDF5120734 for ; Tue, 16 Jun 2020 07:24:19 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726625AbgFPHYS (ORCPT ); Tue, 16 Jun 2020 03:24:18 -0400 Received: from mail-il1-f199.google.com ([209.85.166.199]:51561 "EHLO mail-il1-f199.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725768AbgFPHYS (ORCPT ); Tue, 16 Jun 2020 03:24:18 -0400 Received: by mail-il1-f199.google.com with SMTP id q14so13819961ils.18 for ; Tue, 16 Jun 2020 00:24:17 -0700 (PDT) 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=ZdWIOYvkiIOg4vYGvFgi1tPGOJbPhRJ3Ki0mZxvE4Iw=; b=qcDLLwchWySsMkb6PoNfTJ9hptrSyUyKRfRAuYm4uRpntWFjNiXf1cm9j122XPgOMY lHDlHMtin7wr5+m4KGEcbKokoFrmjhROsf9dAE0nt+DBXV25tCy+qwFteW9AtG5uuZcC OVKL0b07vdcBx0z9qhMhqI4G5f0PbVc2XoUO8rbrr+8xu1rqV9zVDDHnZOY4otxXwQjN 5riTc4EOlMiNC5Tq+IhMDJ6p3oognA485eiD0nCTzSoQ1QwAzxtaVUdkQBujNiBPfGxw LerCv23a4s9Mj8a+6hfID/BUTGzK0Iz9xa1HqU6xseYYHuOpWlwEYvncYI93dA9qzoG4 YHJA== X-Gm-Message-State: AOAM533VQyjjNWg31cNODDNwh/u6u1zu/p46+c1oqLHW+kkiRCizY3gF /4dKJ6pIvW7qIrt6cjqmMZYhKqs9F/rEETQn9XHNdTFa4piq X-Google-Smtp-Source: ABdhPJyvu1bXzVNFDliZkRhDbUl4/BzWQ/PjagkbT4ZRZwOzlBcnKfW/wGz/l3MTc0z/cWl8QJIxLsMmJYNF0rXlkk/KRWwZudiO MIME-Version: 1.0 X-Received: by 2002:a02:cc56:: with SMTP id i22mr24915874jaq.31.1592292257033; Tue, 16 Jun 2020 00:24:17 -0700 (PDT) Date: Tue, 16 Jun 2020 00:24:17 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <0000000000005bf70205a82e6e74@google.com> Subject: upstream test error: KASAN: use-after-free Write in afs_wake_up_async_call From: syzbot To: dhowells@redhat.com, linux-afs@lists.infradead.org, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" 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: a5dc8300 scripts/decode_stacktrace: warn when modpath is n.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=178a88b9100000 kernel config: https://syzkaller.appspot.com/x/.config?x=b8ad29058cb749bc dashboard link: https://syzkaller.appspot.com/bug?extid=82523b7c170a6f515f9a compiler: gcc (GCC) 9.0.0 20181231 (experimental) IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+82523b7c170a6f515f9a@syzkaller.appspotmail.com tipc: TX() has been purged, node left! ================================================================== BUG: KASAN: use-after-free in afs_wake_up_async_call+0x6aa/0x770 fs/afs/rxrpc.c:707 Write of size 1 at addr ffff88809f3489e4 by task kworker/u4:7/273 CPU: 0 PID: 273 Comm: kworker/u4:7 Not tainted 5.8.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: netns cleanup_net Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x18f/0x20d lib/dump_stack.c:118 print_address_description.constprop.0.cold+0xd3/0x413 mm/kasan/report.c:383 __kasan_report mm/kasan/report.c:513 [inline] kasan_report.cold+0x1f/0x37 mm/kasan/report.c:530 afs_wake_up_async_call+0x6aa/0x770 fs/afs/rxrpc.c:707 rxrpc_notify_socket+0x1db/0x5d0 net/rxrpc/recvmsg.c:40 __rxrpc_set_call_completion.part.0+0x172/0x410 net/rxrpc/recvmsg.c:76 __rxrpc_call_completed net/rxrpc/recvmsg.c:112 [inline] rxrpc_call_completed+0xca/0xf0 net/rxrpc/recvmsg.c:111 rxrpc_discard_prealloc+0x781/0xab0 net/rxrpc/call_accept.c:233 rxrpc_listen+0x147/0x360 net/rxrpc/af_rxrpc.c:245 afs_close_socket+0x95/0x320 fs/afs/rxrpc.c:110 afs_net_exit+0x1bc/0x310 fs/afs/main.c:155 ops_exit_list.isra.0+0xa8/0x150 net/core/net_namespace.c:186 cleanup_net+0x511/0xa50 net/core/net_namespace.c:603 process_one_work+0x965/0x1690 kernel/workqueue.c:2269 worker_thread+0x96/0xe10 kernel/workqueue.c:2415 kthread+0x3b5/0x4a0 kernel/kthread.c:291 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:293 Allocated by task 6853: save_stack+0x1b/0x40 mm/kasan/common.c:48 set_track mm/kasan/common.c:56 [inline] __kasan_kmalloc mm/kasan/common.c:494 [inline] __kasan_kmalloc.constprop.0+0xbf/0xd0 mm/kasan/common.c:467 kmem_cache_alloc_trace+0x153/0x7d0 mm/slab.c:3551 kmalloc include/linux/slab.h:555 [inline] kzalloc include/linux/slab.h:669 [inline] afs_alloc_call+0x55/0x630 fs/afs/rxrpc.c:141 afs_charge_preallocation+0xe9/0x2d0 fs/afs/rxrpc.c:757 afs_open_socket+0x292/0x360 fs/afs/rxrpc.c:92 afs_net_init+0xa6c/0xe30 fs/afs/main.c:125 ops_init+0xaf/0x420 net/core/net_namespace.c:151 setup_net+0x2de/0x860 net/core/net_namespace.c:341 copy_net_ns+0x293/0x590 net/core/net_namespace.c:482 create_new_namespaces+0x3fb/0xb30 kernel/nsproxy.c:110 unshare_nsproxy_namespaces+0xbd/0x1f0 kernel/nsproxy.c:231 ksys_unshare+0x43d/0x8e0 kernel/fork.c:2983 __do_sys_unshare kernel/fork.c:3051 [inline] __se_sys_unshare kernel/fork.c:3049 [inline] __x64_sys_unshare+0x2d/0x40 kernel/fork.c:3049 do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:359 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Freed by task 273: save_stack+0x1b/0x40 mm/kasan/common.c:48 set_track mm/kasan/common.c:56 [inline] kasan_set_free_info mm/kasan/common.c:316 [inline] __kasan_slab_free+0xf7/0x140 mm/kasan/common.c:455 __cache_free mm/slab.c:3426 [inline] kfree+0x109/0x2b0 mm/slab.c:3757 afs_put_call+0x585/0xa40 fs/afs/rxrpc.c:190 rxrpc_discard_prealloc+0x764/0xab0 net/rxrpc/call_accept.c:230 rxrpc_listen+0x147/0x360 net/rxrpc/af_rxrpc.c:245 afs_close_socket+0x95/0x320 fs/afs/rxrpc.c:110 afs_net_exit+0x1bc/0x310 fs/afs/main.c:155 ops_exit_list.isra.0+0xa8/0x150 net/core/net_namespace.c:186 cleanup_net+0x511/0xa50 net/core/net_namespace.c:603 process_one_work+0x965/0x1690 kernel/workqueue.c:2269 worker_thread+0x96/0xe10 kernel/workqueue.c:2415 kthread+0x3b5/0x4a0 kernel/kthread.c:291 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:293 The buggy address belongs to the object at ffff88809f348800 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 484 bytes inside of 1024-byte region [ffff88809f348800, ffff88809f348c00) The buggy address belongs to the page: page:ffffea00027cd200 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 flags: 0xfffe0000000200(slab) raw: 00fffe0000000200 ffffea00029b8bc8 ffffea00024a2608 ffff8880aa000c40 raw: 0000000000000000 ffff88809f348000 0000000100000002 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88809f348880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88809f348900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88809f348980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88809f348a00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88809f348a80: 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.