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 382EAC54EBD for ; Thu, 12 Jan 2023 10:30:20 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232271AbjALKaP (ORCPT ); Thu, 12 Jan 2023 05:30:15 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:58884 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236265AbjALK30 (ORCPT ); Thu, 12 Jan 2023 05:29:26 -0500 Received: from mail-il1-f199.google.com (mail-il1-f199.google.com [209.85.166.199]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 473CA2BC3 for ; Thu, 12 Jan 2023 02:26:50 -0800 (PST) Received: by mail-il1-f199.google.com with SMTP id i14-20020a056e020d8e00b003034b93bd07so13056602ilj.14 for ; Thu, 12 Jan 2023 02:26:50 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=to:from:subject:message-id:date:mime-version:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=ODnPLG0v7ynTFtyJV/A9n2rGTO7qvfzZOsZ9+IJTkSs=; b=1sS85c4knvaUOdaFJglw4tE2R37ne/s3Lrd8u3KbAB19xiOkaue69S2f2DkvV6Pa+F auY0HqPHGcA6nLbnN6ZdXvjnR+57ZqF+3B93Ui3rBn2wz03pEruUFPIIWemT/n2zadMQ GbFTIMynwSJX09+zGUS+3rZ7LDRONx8EtULsU1nPCODifocT+kYQtqoN2DxhIufxGcBv eyr0HHhC7ll6J9sZrN+lLlNSAJpqVjbjdGgIq8kn1feLF61fF8mbtJFIRBZ+g4vb7t2r QIpQWPtTWQrkP81I+P7uKAA/tUuzqCyw2EOs7vAiUmJA7YMpB0sGD9yAgQBKhCh/wXXw iS5Q== X-Gm-Message-State: AFqh2kr8V2+qfvIgiE5b0ffMTjI8hIjOqS1MN0MzhpnbfKDEqsY6QRSq eX9EHrkOOXbGVFDPjWbpsgnBeqqXNDWWmrsgRQ0Dj8I8Mp+Q X-Google-Smtp-Source: AMrXdXsgRIgGweu5f7ioaEKoEOl5w0XGjNlw+fgdPXlSQS397Lq84hH9NACF+0BQ8hZHVuu8tNm9U+qmBkK9HwNDhYhTdp9RjGDT MIME-Version: 1.0 X-Received: by 2002:a05:6e02:13cb:b0:30d:a755:aa63 with SMTP id v11-20020a056e0213cb00b0030da755aa63mr2392915ilj.323.1673519209661; Thu, 12 Jan 2023 02:26:49 -0800 (PST) Date: Thu, 12 Jan 2023 02:26:49 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <000000000000044bca05f20e8e16@google.com> Subject: [syzbot] KASAN: use-after-free Read in __io_req_task_work_add 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: 0a093b2893c7 Add linux-next specific files for 20230112 git tree: linux-next console output: https://syzkaller.appspot.com/x/log.txt?x=111a5a86480000 kernel config: https://syzkaller.appspot.com/x/.config?x=835f3591019836d5 dashboard link: https://syzkaller.appspot.com/bug?extid=01db4d8aed628ede44b1 compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/8111a570d6cb/disk-0a093b28.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/ecc135b7fc9a/vmlinux-0a093b28.xz kernel image: https://storage.googleapis.com/syzbot-assets/ca8d73b446ea/bzImage-0a093b28.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+01db4d8aed628ede44b1@syzkaller.appspotmail.com ================================================================== BUG: KASAN: use-after-free in __io_req_task_work_add+0x6b4/0x760 io_uring/io_uring.c:1287 Read of size 8 at addr ffff888027236018 by task syz-executor.3/11047 CPU: 0 PID: 11047 Comm: syz-executor.3 Not tainted 6.2.0-rc3-next-20230112-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd1/0x138 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:306 [inline] print_report+0x15e/0x45d mm/kasan/report.c:417 kasan_report+0xc0/0xf0 mm/kasan/report.c:517 __io_req_task_work_add+0x6b4/0x760 io_uring/io_uring.c:1287 io_req_task_work_add io_uring/io_uring.h:95 [inline] __io_poll_execute io_uring/poll.c:366 [inline] io_poll_execute.constprop.0+0x15b/0x190 io_uring/poll.c:372 io_poll_cancel_req io_uring/poll.c:379 [inline] io_poll_remove_all_table+0x26d/0x2bd io_uring/poll.c:741 io_poll_remove_all+0x2e/0x4b io_uring/poll.c:759 io_ring_ctx_wait_and_kill+0x1a0/0x340 io_uring/io_uring.c:3017 io_uring_release+0x46/0x4a io_uring/io_uring.c:3042 __fput+0x27c/0xa90 fs/file_table.c:321 task_work_run+0x16f/0x270 kernel/task_work.c:179 exit_task_work include/linux/task_work.h:38 [inline] do_exit+0xb17/0x2a90 kernel/exit.c:867 do_group_exit+0xd4/0x2a0 kernel/exit.c:1012 __do_sys_exit_group kernel/exit.c:1023 [inline] __se_sys_exit_group kernel/exit.c:1021 [inline] __x64_sys_exit_group+0x3e/0x50 kernel/exit.c:1021 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7fd01608c0c9 Code: Unable to access opcode bytes at 0x7fd01608c09f. RSP: 002b:00007ffe4aaf8e78 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 RAX: ffffffffffffffda RBX: 000000000000001e RCX: 00007fd01608c0c9 RDX: 00007fd01603df7b RSI: ffffffffffffffb8 RDI: 0000000000000000 RBP: 0000000000000000 R08: 0000000023b38e02 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 R13: 0000000000000000 R14: 0000000000000001 R15: 00007ffe4aaf8f60 Allocated by task 11047: kasan_save_stack+0x22/0x40 mm/kasan/common.c:45 kasan_set_track+0x25/0x30 mm/kasan/common.c:52 __kasan_slab_alloc+0x7f/0x90 mm/kasan/common.c:325 kasan_slab_alloc include/linux/kasan.h:186 [inline] slab_post_alloc_hook mm/slab.h:769 [inline] slab_alloc_node mm/slub.c:3452 [inline] kmem_cache_alloc_node+0x183/0x350 mm/slub.c:3497 alloc_task_struct_node kernel/fork.c:171 [inline] dup_task_struct kernel/fork.c:979 [inline] copy_process+0x3aa/0x7740 kernel/fork.c:2103 kernel_clone+0xeb/0x9a0 kernel/fork.c:2687 __do_sys_clone+0xba/0x100 kernel/fork.c:2828 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd Freed by task 15: kasan_save_stack+0x22/0x40 mm/kasan/common.c:45 kasan_set_track+0x25/0x30 mm/kasan/common.c:52 kasan_save_free_info+0x2e/0x40 mm/kasan/generic.c:518 ____kasan_slab_free mm/kasan/common.c:236 [inline] ____kasan_slab_free+0x160/0x1c0 mm/kasan/common.c:200 kasan_slab_free include/linux/kasan.h:162 [inline] slab_free_hook mm/slub.c:1781 [inline] slab_free_freelist_hook+0x8b/0x1c0 mm/slub.c:1807 slab_free mm/slub.c:3787 [inline] kmem_cache_free+0xec/0x4e0 mm/slub.c:3809 put_task_struct include/linux/sched/task.h:119 [inline] delayed_put_task_struct+0x26e/0x3f0 kernel/exit.c:225 rcu_do_batch kernel/rcu/tree.c:2113 [inline] rcu_core+0x821/0x1920 kernel/rcu/tree.c:2373 __do_softirq+0x1fb/0xaf6 kernel/softirq.c:571 Last potentially related work creation: kasan_save_stack+0x22/0x40 mm/kasan/common.c:45 __kasan_record_aux_stack+0xbc/0xd0 mm/kasan/generic.c:488 __call_rcu_common.constprop.0+0x99/0x780 kernel/rcu/tree.c:2622 put_task_struct_rcu_user+0x83/0xc0 kernel/exit.c:231 context_switch kernel/sched/core.c:5304 [inline] __schedule+0x25d8/0x5a70 kernel/sched/core.c:6619 preempt_schedule_common+0x45/0xc0 kernel/sched/core.c:6788 preempt_schedule_thunk+0x1a/0x20 arch/x86/entry/thunk_64.S:34 __raw_spin_unlock_irq include/linux/spinlock_api_smp.h:160 [inline] _raw_spin_unlock_irq+0x40/0x50 kernel/locking/spinlock.c:202 spin_unlock_irq include/linux/spinlock.h:400 [inline] do_group_exit+0x1c5/0x2a0 kernel/exit.c:1009 __do_sys_exit_group kernel/exit.c:1023 [inline] __se_sys_exit_group kernel/exit.c:1021 [inline] __x64_sys_exit_group+0x3e/0x50 kernel/exit.c:1021 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd Second to last potentially related work creation: kasan_save_stack+0x22/0x40 mm/kasan/common.c:45 __kasan_record_aux_stack+0xbc/0xd0 mm/kasan/generic.c:488 __call_rcu_common.constprop.0+0x99/0x780 kernel/rcu/tree.c:2622 put_task_struct_rcu_user+0x83/0xc0 kernel/exit.c:231 release_task+0xcc8/0x1870 kernel/exit.c:281 wait_task_zombie kernel/exit.c:1198 [inline] wait_consider_task+0x306d/0x3ce0 kernel/exit.c:1425 do_wait_thread kernel/exit.c:1488 [inline] do_wait+0x7cd/0xd90 kernel/exit.c:1605 kernel_wait4+0x150/0x260 kernel/exit.c:1768 __do_sys_wait4+0x13f/0x150 kernel/exit.c:1796 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd The buggy address belongs to the object at ffff8880272357c0 which belongs to the cache task_struct of size 7232 The buggy address is located 2136 bytes inside of 7232-byte region [ffff8880272357c0, ffff888027237400) The buggy address belongs to the physical page: page:ffffea00009c8c00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x27230 head:ffffea00009c8c00 order:3 entire_mapcount:0 nr_pages_mapped:0 pincount:0 memcg:ffff8880219a5c01 ksm flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 ffff8880125ec500 ffffea0000ab3800 dead000000000003 raw: 0000000000000000 0000000000040004 00000001ffffffff ffff8880219a5c01 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 56, tgid 56 (kworker/u4:4), ts 11164250893, free_ts 0 prep_new_page mm/page_alloc.c:2549 [inline] get_page_from_freelist+0x11bb/0x2d50 mm/page_alloc.c:4324 __alloc_pages+0x1cb/0x5c0 mm/page_alloc.c:5590 alloc_pages+0x1aa/0x270 mm/mempolicy.c:2281 alloc_slab_page mm/slub.c:1851 [inline] allocate_slab+0x25f/0x350 mm/slub.c:1998 new_slab mm/slub.c:2051 [inline] ___slab_alloc+0xa91/0x1400 mm/slub.c:3193 __slab_alloc.constprop.0+0x56/0xa0 mm/slub.c:3292 __slab_alloc_node mm/slub.c:3345 [inline] slab_alloc_node mm/slub.c:3442 [inline] kmem_cache_alloc_node+0x136/0x350 mm/slub.c:3497 alloc_task_struct_node kernel/fork.c:171 [inline] dup_task_struct kernel/fork.c:979 [inline] copy_process+0x3aa/0x7740 kernel/fork.c:2103 kernel_clone+0xeb/0x9a0 kernel/fork.c:2687 user_mode_thread+0xb1/0xf0 kernel/fork.c:2763 call_usermodehelper_exec_work kernel/umh.c:175 [inline] call_usermodehelper_exec_work+0xd0/0x180 kernel/umh.c:161 process_one_work+0x9bf/0x1750 kernel/workqueue.c:2293 worker_thread+0x669/0x1090 kernel/workqueue.c:2440 kthread+0x2e8/0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 page_owner free stack trace missing Memory state around the buggy address: ffff888027235f00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888027235f80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888027236000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888027236080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888027236100: 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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