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 B0383C54EBC for ; Thu, 12 Jan 2023 10:12:01 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237195AbjALKMA (ORCPT ); Thu, 12 Jan 2023 05:12:00 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:46314 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S237511AbjALKLJ (ORCPT ); Thu, 12 Jan 2023 05:11:09 -0500 Received: from mail-io1-f71.google.com (mail-io1-f71.google.com [209.85.166.71]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 68B14F0D for ; Thu, 12 Jan 2023 02:09:43 -0800 (PST) Received: by mail-io1-f71.google.com with SMTP id t15-20020a5d81cf000000b006f95aa9ba6eso10934198iol.16 for ; Thu, 12 Jan 2023 02:09:43 -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=kL4dCH663Y91IgXPc1uA9oWX+JA++Dgb92FuGb43z24=; b=RtFdYZwguZrwthwPepn1C6/g8Y7AL0l2oQ9OOVad4oytYAU8+0xDmF20GKD4UjZRcv sGDPozGedRK9lm4rpzhlvbsKbZeT5/MPz4yosdiJWBa6SaNYDfi1+4bhHOpuKWswAg/g pywi2/ww1kCt28fdGAagPDk/NnfW0R16oyzSwLz51aVwR83AyJUjJWsIrBwaBZXfaCAy 331OuAoC9oIyHD2ucuGNNSTw7cn/YETfNa8Xwc0JZ/8sCM3XwM6paVkgOecyU6AxVQId fQ4i7BqeHWeYsOGotgmfUD/pTXm18mu+u9qNSi6dcAzK5SHhG5/y/aEuemR/82gtpr4k K/9A== X-Gm-Message-State: AFqh2krmCNTs2CJp/GHNYoRRKwn/cpsDZ7K3h2+CMqjC7MPQ6CO+CYY1 7L/KGWPf3gBJ69Ic42F8R0PRjKToOpdHdGk1eEn32xcwpzUq X-Google-Smtp-Source: AMrXdXtreEYcVZ19eYluopR11N/j8aA4DoDBJxDwX/BolqT4nB30Bua9C/p6nZhe2J3tg1V4Eu3lzh50i4IZmozi/qBGmeZ8atoF MIME-Version: 1.0 X-Received: by 2002:a05:6638:4101:b0:39e:5302:38c0 with SMTP id ay1-20020a056638410100b0039e530238c0mr2890396jab.128.1673518182762; Thu, 12 Jan 2023 02:09:42 -0800 (PST) Date: Thu, 12 Jan 2023 02:09:42 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <000000000000cf0f4905f20e504c@google.com> Subject: [syzbot] KASAN: use-after-free Read in io_fallback_req_func 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=103269ce480000 kernel config: https://syzkaller.appspot.com/x/.config?x=835f3591019836d5 dashboard link: https://syzkaller.appspot.com/bug?extid=bc022c162e3b001bf607 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+bc022c162e3b001bf607@syzkaller.appspotmail.com ================================================================== BUG: KASAN: use-after-free in io_fallback_req_func+0xc7/0x204 io_uring/io_uring.c:251 Read of size 8 at addr ffff888070ac2e48 by task kworker/0:0/7 CPU: 0 PID: 7 Comm: kworker/0:0 Not tainted 6.2.0-rc3-next-20230112-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 Workqueue: events io_fallback_req_func 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_fallback_req_func+0xc7/0x204 io_uring/io_uring.c:251 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 Allocated by task 7766: 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] kmem_cache_alloc_bulk+0x3aa/0x730 mm/slub.c:4033 __io_alloc_req_refill+0xcc/0x40b io_uring/io_uring.c:1062 io_alloc_req_refill io_uring/io_uring.h:348 [inline] io_submit_sqes.cold+0x7c/0xc2 io_uring/io_uring.c:2407 __do_sys_io_uring_enter+0x9e4/0x2c10 io_uring/io_uring.c:3429 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 5179: 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 io_req_caches_free+0x1a9/0x1e6 io_uring/io_uring.c:2737 io_ring_exit_work+0x2e7/0xc80 io_uring/io_uring.c:2967 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 The buggy address belongs to the object at ffff888070ac2dc0 which belongs to the cache io_kiocb of size 216 The buggy address is located 136 bytes inside of 216-byte region [ffff888070ac2dc0, ffff888070ac2e98) The buggy address belongs to the physical page: page:ffffea0001c2b080 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x70ac2 memcg:ffff88802a81d181 flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000000200 ffff8881461d1780 dead000000000122 0000000000000000 raw: 0000000000000000 00000000800c000c 00000001ffffffff ffff88802a81d181 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Unmovable, gfp_mask 0x112cc0(GFP_USER|__GFP_NOWARN|__GFP_NORETRY), pid 5547, tgid 5545 (syz-executor.4), ts 182131630120, free_ts 181898498774 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 __kmem_cache_alloc_bulk mm/slub.c:3951 [inline] kmem_cache_alloc_bulk+0x23d/0x730 mm/slub.c:4026 __io_alloc_req_refill+0xcc/0x40b io_uring/io_uring.c:1062 io_alloc_req_refill io_uring/io_uring.h:348 [inline] io_submit_sqes.cold+0x7c/0xc2 io_uring/io_uring.c:2407 __do_sys_io_uring_enter+0x9e4/0x2c10 io_uring/io_uring.c:3429 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 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1451 [inline] free_pcp_prepare+0x4d0/0x910 mm/page_alloc.c:1501 free_unref_page_prepare mm/page_alloc.c:3387 [inline] free_unref_page+0x1d/0x490 mm/page_alloc.c:3482 qlink_free mm/kasan/quarantine.c:168 [inline] qlist_free_all+0x6a/0x170 mm/kasan/quarantine.c:187 kasan_quarantine_reduce+0x192/0x220 mm/kasan/quarantine.c:294 __kasan_slab_alloc+0x63/0x90 mm/kasan/common.c:302 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] slab_alloc mm/slub.c:3460 [inline] __kmem_cache_alloc_lru mm/slub.c:3467 [inline] kmem_cache_alloc+0x175/0x320 mm/slub.c:3476 kmem_cache_zalloc include/linux/slab.h:710 [inline] taskstats_tgid_alloc kernel/taskstats.c:583 [inline] taskstats_exit+0x5f3/0xb80 kernel/taskstats.c:622 do_exit+0x822/0x2a90 kernel/exit.c:852 do_group_exit+0xd4/0x2a0 kernel/exit.c:1012 get_signal+0x225f/0x24f0 kernel/signal.c:2859 arch_do_signal_or_restart+0x79/0x5c0 arch/x86/kernel/signal.c:306 exit_to_user_mode_loop kernel/entry/common.c:168 [inline] exit_to_user_mode_prepare+0x11f/0x240 kernel/entry/common.c:204 __syscall_exit_to_user_mode_work kernel/entry/common.c:286 [inline] syscall_exit_to_user_mode+0x1d/0x50 kernel/entry/common.c:297 do_syscall_64+0x46/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x63/0xcd Memory state around the buggy address: ffff888070ac2d00: fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc fc ffff888070ac2d80: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb >ffff888070ac2e00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888070ac2e80: fb fb fb fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888070ac2f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ================================================================== --- This report is generated by a bot. 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