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=-3.7 required=3.0 tests=BAYES_00,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 A436BC4363A for ; Mon, 5 Oct 2020 08:56:20 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 69B592078D for ; Mon, 5 Oct 2020 08:56:20 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726003AbgJEI4T (ORCPT ); Mon, 5 Oct 2020 04:56:19 -0400 Received: from mail-il1-f206.google.com ([209.85.166.206]:42408 "EHLO mail-il1-f206.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725909AbgJEI4S (ORCPT ); Mon, 5 Oct 2020 04:56:18 -0400 Received: by mail-il1-f206.google.com with SMTP id 18so6754024ilt.9 for ; Mon, 05 Oct 2020 01:56:17 -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=Amwp1aqa7bTc2xanzlXXNgO7NgBXnd0zxzTo/kSRKZ4=; b=Xsg/actd4yDtZvnL7wkHWK/TrDvpF0drBoGl9KRFbJqcGHqbmxq2OiuR/e08iOnaIg +X5V/0Hl/vaO3+mLTeFuIyW0NOUtbcawbbM+cz83xPZWe9M3TggLiEnY+pBxVZ3mkUxa +iTpPdJ3Q2RGYGoZVGAWrPWK+l31Pow1YJWXY5mFmAdXzZC9MZlNLio15WFtiYlD3Qy3 YlCo2ISGMULf4LD7lzVmG1vPoFCMiHAmhPHWqApq8NXZRohUeJOEGNXqTk/X6xcVPStQ CYH7taHS2SA1069eOaRt1EB6zKsnc3C6dNw1eAmq2INjYwtZRjKpmSu7exIVkmMHboqp gpzQ== X-Gm-Message-State: AOAM533rzLeF5MwY7QOy33d7vkdjvlQH5xkV0h1x/+Drwdk8x317xoW2 HXb3NkVSTLK8L5R9blzfhcT9qr2Mc+MscffgFebEiWt3fRgO X-Google-Smtp-Source: ABdhPJz3JXucT/swRsk+KIgFBhBuEK/6ZIeOJpjrlErbuuvYmaYmsTK0T6RYtV+OwHha6Wy2dAHmV1TceajiSoT4jt4LsTh/NmKg MIME-Version: 1.0 X-Received: by 2002:a05:6e02:46:: with SMTP id i6mr9221812ilr.74.1601888177519; Mon, 05 Oct 2020 01:56:17 -0700 (PDT) Date: Mon, 05 Oct 2020 01:56:17 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <000000000000ca835605b0e8a723@google.com> Subject: KASAN: use-after-free Read in idr_for_each (2) From: syzbot To: axboe@kernel.dk, io-uring@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com, viro@zeniv.linux.org.uk Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hello, syzbot found the following issue on: HEAD commit: 472e5b05 pipe: remove pipe_wait() and fix wakeup race with.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=15ae0d47900000 kernel config: https://syzkaller.appspot.com/x/.config?x=89ab6a0c48f30b49 dashboard link: https://syzkaller.appspot.com/bug?extid=12056a09a0311d758e60 compiler: gcc (GCC) 10.1.0-syz 20200507 userspace arch: i386 Unfortunately, I don't have any reproducer for this issue yet. IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+12056a09a0311d758e60@syzkaller.appspotmail.com ================================================================== BUG: KASAN: use-after-free in radix_tree_next_slot include/linux/radix-tree.h:421 [inline] BUG: KASAN: use-after-free in idr_for_each+0x206/0x220 lib/idr.c:202 Read of size 8 at addr ffff88804eb9cb30 by task kworker/u4:8/13668 CPU: 1 PID: 13668 Comm: kworker/u4:8 Not tainted 5.9.0-rc7-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: events_unbound io_ring_exit_work Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x198/0x1fd lib/dump_stack.c:118 print_address_description.constprop.0.cold+0xae/0x497 mm/kasan/report.c:383 __kasan_report mm/kasan/report.c:513 [inline] kasan_report.cold+0x1f/0x37 mm/kasan/report.c:530 radix_tree_next_slot include/linux/radix-tree.h:421 [inline] idr_for_each+0x206/0x220 lib/idr.c:202 io_destroy_buffers fs/io_uring.c:7889 [inline] io_ring_ctx_free fs/io_uring.c:7904 [inline] io_ring_exit_work+0x363/0x6d0 fs/io_uring.c:7979 process_one_work+0x94c/0x1670 kernel/workqueue.c:2269 worker_thread+0x64c/0x1120 kernel/workqueue.c:2415 kthread+0x3b5/0x4a0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 Allocated by task 17016: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:48 kasan_set_track mm/kasan/common.c:56 [inline] __kasan_kmalloc.constprop.0+0xbf/0xd0 mm/kasan/common.c:461 slab_post_alloc_hook mm/slab.h:518 [inline] slab_alloc mm/slab.c:3316 [inline] kmem_cache_alloc+0x13a/0x3f0 mm/slab.c:3486 radix_tree_node_alloc.constprop.0+0x7c/0x350 lib/radix-tree.c:275 idr_get_free+0x4c5/0x940 lib/radix-tree.c:1505 idr_alloc_u32+0x170/0x2d0 lib/idr.c:46 idr_alloc+0xc2/0x130 lib/idr.c:87 io_provide_buffers fs/io_uring.c:3768 [inline] io_issue_sqe+0x48d2/0x5c50 fs/io_uring.c:5906 __io_queue_sqe+0x280/0x1160 fs/io_uring.c:6178 io_queue_sqe+0x692/0xfa0 fs/io_uring.c:6257 io_submit_sqe fs/io_uring.c:6327 [inline] io_submit_sqes+0x1759/0x23f0 fs/io_uring.c:6521 __do_sys_io_uring_enter+0xeac/0x1bd0 fs/io_uring.c:8349 do_syscall_32_irqs_on arch/x86/entry/common.c:78 [inline] __do_fast_syscall_32+0x60/0x90 arch/x86/entry/common.c:137 do_fast_syscall_32+0x2f/0x70 arch/x86/entry/common.c:160 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c Freed by task 16: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:48 kasan_set_track+0x1c/0x30 mm/kasan/common.c:56 kasan_set_free_info+0x1b/0x30 mm/kasan/generic.c:355 __kasan_slab_free+0xd8/0x120 mm/kasan/common.c:422 __cache_free mm/slab.c:3422 [inline] kmem_cache_free.part.0+0x74/0x1e0 mm/slab.c:3697 rcu_do_batch kernel/rcu/tree.c:2430 [inline] rcu_core+0x5ca/0x1130 kernel/rcu/tree.c:2658 __do_softirq+0x1f8/0xb23 kernel/softirq.c:298 Last call_rcu(): kasan_save_stack+0x1b/0x40 mm/kasan/common.c:48 kasan_record_aux_stack+0x82/0xb0 mm/kasan/generic.c:346 __call_rcu kernel/rcu/tree.c:2896 [inline] call_rcu+0x15e/0x7c0 kernel/rcu/tree.c:2970 radix_tree_node_free lib/radix-tree.c:309 [inline] delete_node+0x591/0x8c0 lib/radix-tree.c:572 __radix_tree_delete+0x190/0x370 lib/radix-tree.c:1378 radix_tree_delete_item+0xe7/0x230 lib/radix-tree.c:1429 __io_remove_buffers fs/io_uring.c:3666 [inline] __io_remove_buffers fs/io_uring.c:3645 [inline] __io_destroy_buffers+0x161/0x200 fs/io_uring.c:7883 idr_for_each+0x113/0x220 lib/idr.c:208 io_destroy_buffers fs/io_uring.c:7889 [inline] io_ring_ctx_free fs/io_uring.c:7904 [inline] io_ring_exit_work+0x363/0x6d0 fs/io_uring.c:7979 process_one_work+0x94c/0x1670 kernel/workqueue.c:2269 worker_thread+0x64c/0x1120 kernel/workqueue.c:2415 kthread+0x3b5/0x4a0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 Second to last call_rcu(): kasan_save_stack+0x1b/0x40 mm/kasan/common.c:48 kasan_record_aux_stack+0x82/0xb0 mm/kasan/generic.c:346 __call_rcu kernel/rcu/tree.c:2896 [inline] call_rcu+0x15e/0x7c0 kernel/rcu/tree.c:2970 radix_tree_node_free lib/radix-tree.c:309 [inline] radix_tree_shrink lib/radix-tree.c:535 [inline] delete_node+0x37a/0x8c0 lib/radix-tree.c:553 __radix_tree_delete+0x190/0x370 lib/radix-tree.c:1378 radix_tree_delete_item+0xe7/0x230 lib/radix-tree.c:1429 free_pid+0xa1/0x260 kernel/pid.c:151 __change_pid+0x1c7/0x2d0 kernel/pid.c:352 __unhash_process kernel/exit.c:77 [inline] __exit_signal kernel/exit.c:147 [inline] release_task+0xd29/0x14d0 kernel/exit.c:198 wait_task_zombie kernel/exit.c:1088 [inline] wait_consider_task+0x2fd2/0x3b70 kernel/exit.c:1315 do_wait_thread kernel/exit.c:1378 [inline] do_wait+0x376/0xa00 kernel/exit.c:1449 kernel_wait4+0x14c/0x260 kernel/exit.c:1621 do_syscall_32_irqs_on arch/x86/entry/common.c:78 [inline] __do_fast_syscall_32+0x60/0x90 arch/x86/entry/common.c:137 do_fast_syscall_32+0x2f/0x70 arch/x86/entry/common.c:160 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c The buggy address belongs to the object at ffff88804eb9cb00 which belongs to the cache radix_tree_node of size 576 The buggy address is located 48 bytes inside of 576-byte region [ffff88804eb9cb00, ffff88804eb9cd40) The buggy address belongs to the page: page:00000000a35d3b6e refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88804eb9cffb pfn:0x4eb9c flags: 0xfffe0000000200(slab) raw: 00fffe0000000200 ffffea00013ab388 ffffea0002927748 ffff8880aa06f000 raw: ffff88804eb9cffb ffff88804eb9c000 0000000100000005 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88804eb9ca00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88804eb9ca80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88804eb9cb00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88804eb9cb80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88804eb9cc00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== --- This report 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 issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot.