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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id CC30CC433F5 for ; Sat, 19 Feb 2022 09:20:27 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S238925AbiBSJUo (ORCPT ); Sat, 19 Feb 2022 04:20:44 -0500 Received: from mxb-00190b01.gslb.pphosted.com ([23.128.96.19]:41534 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236876AbiBSJUo (ORCPT ); Sat, 19 Feb 2022 04:20:44 -0500 Received: from mail-il1-f200.google.com (mail-il1-f200.google.com [209.85.166.200]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 7E24D207FE9 for ; Sat, 19 Feb 2022 01:20:25 -0800 (PST) Received: by mail-il1-f200.google.com with SMTP id x6-20020a92d306000000b002bdff65a8e1so5429471ila.3 for ; Sat, 19 Feb 2022 01:20:25 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:mime-version:date:message-id:subject:from:to; bh=ckvJmtS+yRVhxy+A79GduUDFZwqPmpPSNh3O8zJ0EkU=; b=YGjf+PK1usKs7zMZG69y7IYKn2UJsJ+5tZ80aA8rQeBfPfSrX4wZ0j8DE2kvkPaCpW uwZbDVyyCkNTJJuY3X7G8zpY0YMNJ2E5gK1dPBwi8Ksqrnu4xHs+N+BXl8MIN1CP+YwM GjJZ4JBZrCijsL/fbhTHIU/Ja2eubU7oa6GMHeGtQJ2QsCK0No2anhhmdbs0hDGG3RVr SZocGEITAkzRuGplWtlMHIG7Aj9QnMFrNcyGw9PjWH6XoPFui2yDTQNkSYQBQVQr39bZ bn8N6u+AzPFx6qEJLn1N/iAWT5CajEgm0BIRXGl9oCC5/ACnhGaR5qNjNkm5NYW9dDs3 7XSw== X-Gm-Message-State: AOAM532mkHvymhZmealUPEFdZXzxpyZy6iOTuXkzWEaA+jQlhq6d4svY NB//NNqlCjFAAGWZFrWgrL/r1IMeSQaGoM2O3h+9E8nW7mcB X-Google-Smtp-Source: ABdhPJwebZdHdIzFMONM1uJsoutpR4znRB4ODc+YKE99903UIXtDRzSQUDhvwO8U0ut2poXVCkp61f7r1100ZYkoajnFyVOhbN5k MIME-Version: 1.0 X-Received: by 2002:a5e:c64a:0:b0:640:7b5a:3446 with SMTP id s10-20020a5ec64a000000b006407b5a3446mr4376673ioo.82.1645262424834; Sat, 19 Feb 2022 01:20:24 -0800 (PST) Date: Sat, 19 Feb 2022 01:20:24 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <00000000000065061a05d85b8262@google.com> Subject: [syzbot] KASAN: use-after-free Read in io_poll_check_events From: syzbot To: asml.silence@gmail.com, axboe@kernel.dk, io-uring@vger.kernel.org, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: io-uring@vger.kernel.org Hello, syzbot found the following issue on: HEAD commit: d567f5db412e Merge tag 'regulator-fix-v5.17-rc4' of git://.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=137545a4700000 kernel config: https://syzkaller.appspot.com/x/.config?x=c252f01504189189 dashboard link: https://syzkaller.appspot.com/bug?extid=edb9c7738ba8cbdbf197 compiler: Debian clang version 11.0.1-2, GNU ld (GNU Binutils for Debian) 2.35.2 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+edb9c7738ba8cbdbf197@syzkaller.appspotmail.com ================================================================== BUG: KASAN: use-after-free in io_poll_check_events+0x994/0x9a0 fs/io_uring.c:5516 Read of size 4 at addr ffff88802452ba2c by task kworker/1:21/2630 CPU: 1 PID: 2630 Comm: kworker/1:21 Not tainted 5.17.0-rc4-syzkaller-00002-gd567f5db412e #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: events io_fallback_req_func Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1dc/0x2d8 lib/dump_stack.c:106 print_address_description+0x65/0x3a0 mm/kasan/report.c:255 __kasan_report mm/kasan/report.c:442 [inline] kasan_report+0x19a/0x1f0 mm/kasan/report.c:459 io_poll_check_events+0x994/0x9a0 fs/io_uring.c:5516 io_apoll_task_func+0x4c/0xb10 fs/io_uring.c:5590 io_fallback_req_func+0x118/0x1fd fs/io_uring.c:1400 process_one_work+0x86c/0x1190 kernel/workqueue.c:2307 worker_thread+0xab1/0x1300 kernel/workqueue.c:2454 kthread+0x2a3/0x2d0 kernel/kthread.c:377 ret_from_fork+0x1f/0x30 Allocated by task 9351: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track mm/kasan/common.c:45 [inline] set_alloc_info mm/kasan/common.c:436 [inline] __kasan_slab_alloc+0xb2/0xe0 mm/kasan/common.c:469 kasan_slab_alloc include/linux/kasan.h:260 [inline] slab_post_alloc_hook mm/slab.h:732 [inline] slab_alloc_node mm/slub.c:3230 [inline] kmem_cache_alloc_node+0x201/0x370 mm/slub.c:3266 alloc_task_struct_node kernel/fork.c:171 [inline] dup_task_struct+0x52/0x9a0 kernel/fork.c:883 copy_process+0x64a/0x5aa0 kernel/fork.c:1998 kernel_clone+0x22a/0x7e0 kernel/fork.c:2555 __do_sys_clone kernel/fork.c:2672 [inline] __se_sys_clone kernel/fork.c:2656 [inline] __x64_sys_clone+0x245/0x2b0 kernel/fork.c:2656 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae Freed by task 2630: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track+0x4c/0x70 mm/kasan/common.c:45 kasan_set_free_info+0x1f/0x40 mm/kasan/generic.c:370 ____kasan_slab_free+0x126/0x180 mm/kasan/common.c:366 kasan_slab_free include/linux/kasan.h:236 [inline] slab_free_hook mm/slub.c:1728 [inline] slab_free_freelist_hook+0x12e/0x1a0 mm/slub.c:1754 slab_free mm/slub.c:3509 [inline] kmem_cache_free+0xb6/0x1c0 mm/slub.c:3526 __io_req_complete_post+0x25c/0x470 fs/io_uring.c:1960 io_req_complete_post fs/io_uring.c:1972 [inline] io_req_complete_failed fs/io_uring.c:2003 [inline] io_apoll_task_func+0x226/0xb10 fs/io_uring.c:5602 io_fallback_req_func+0x118/0x1fd fs/io_uring.c:1400 process_one_work+0x86c/0x1190 kernel/workqueue.c:2307 worker_thread+0xab1/0x1300 kernel/workqueue.c:2454 kthread+0x2a3/0x2d0 kernel/kthread.c:377 ret_from_fork+0x1f/0x30 Last potentially related work creation: kasan_save_stack+0x3b/0x60 mm/kasan/common.c:38 __kasan_record_aux_stack+0xb2/0xc0 mm/kasan/generic.c:348 __call_rcu kernel/rcu/tree.c:3026 [inline] call_rcu+0x1c4/0xa70 kernel/rcu/tree.c:3106 context_switch kernel/sched/core.c:4990 [inline] __schedule+0x92e/0x1080 kernel/sched/core.c:6296 preempt_schedule_common kernel/sched/core.c:6462 [inline] preempt_schedule+0x14d/0x190 kernel/sched/core.c:6487 preempt_schedule_thunk+0x16/0x18 __raw_spin_unlock_irq include/linux/spinlock_api_smp.h:160 [inline] _raw_spin_unlock_irq+0x3c/0x40 kernel/locking/spinlock.c:202 spin_unlock_irq include/linux/spinlock.h:399 [inline] do_group_exit+0x29f/0x2b0 kernel/exit.c:932 __do_sys_exit_group+0x13/0x20 kernel/exit.c:946 __ia32_sys_exit_group+0x0/0x40 kernel/exit.c:944 __x64_sys_exit_group+0x37/0x40 kernel/exit.c:944 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae Second to last potentially related work creation: kasan_save_stack+0x3b/0x60 mm/kasan/common.c:38 __kasan_record_aux_stack+0xb2/0xc0 mm/kasan/generic.c:348 __call_rcu kernel/rcu/tree.c:3026 [inline] call_rcu+0x1c4/0xa70 kernel/rcu/tree.c:3106 put_task_struct_rcu_user kernel/exit.c:180 [inline] release_task+0x133b/0x15d0 kernel/exit.c:226 wait_task_zombie kernel/exit.c:1121 [inline] wait_consider_task+0x1995/0x3020 kernel/exit.c:1348 do_wait_thread kernel/exit.c:1411 [inline] do_wait+0x291/0x9d0 kernel/exit.c:1528 kernel_wait4+0x2a3/0x3c0 kernel/exit.c:1691 __do_sys_wait4 kernel/exit.c:1719 [inline] __se_sys_wait4 kernel/exit.c:1715 [inline] __x64_sys_wait4+0x130/0x1e0 kernel/exit.c:1715 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae The buggy address belongs to the object at ffff88802452ba00 which belongs to the cache task_struct of size 7168 The buggy address is located 44 bytes inside of 7168-byte region [ffff88802452ba00, ffff88802452d600) The buggy address belongs to the page: page:ffffea0000914a00 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff888024528000 pfn:0x24528 head:ffffea0000914a00 order:3 compound_mapcount:0 compound_pincount:0 memcg:ffff88801b05ff01 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 ffffea00008c1408 ffffea0001f56408 ffff888140006280 raw: ffff888024528000 0000000000040002 00000001ffffffff ffff88801b05ff01 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 3, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 2, ts 12556673292, free_ts 0 prep_new_page mm/page_alloc.c:2434 [inline] get_page_from_freelist+0x729/0x9e0 mm/page_alloc.c:4165 __alloc_pages+0x255/0x580 mm/page_alloc.c:5389 alloc_slab_page mm/slub.c:1799 [inline] allocate_slab+0xce/0x3f0 mm/slub.c:1944 new_slab mm/slub.c:2004 [inline] ___slab_alloc+0x3fe/0xc30 mm/slub.c:3018 __slab_alloc mm/slub.c:3105 [inline] slab_alloc_node mm/slub.c:3196 [inline] kmem_cache_alloc_node+0x2bb/0x370 mm/slub.c:3266 alloc_task_struct_node kernel/fork.c:171 [inline] dup_task_struct+0x52/0x9a0 kernel/fork.c:883 copy_process+0x64a/0x5aa0 kernel/fork.c:1998 kernel_clone+0x22a/0x7e0 kernel/fork.c:2555 kernel_thread+0x155/0x1d0 kernel/fork.c:2607 create_kthread kernel/kthread.c:400 [inline] kthreadd+0x5b5/0x7a0 kernel/kthread.c:746 ret_from_fork+0x1f/0x30 page_owner free stack trace missing Memory state around the buggy address: ffff88802452b900: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88802452b980: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88802452ba00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88802452ba80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88802452bb00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== --- This report is generated by a bot. 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