Received: by 2002:a05:6358:a55:b0:ec:fcf4:3ecf with SMTP id 21csp440266rwb; Thu, 12 Jan 2023 08:02:04 -0800 (PST) X-Google-Smtp-Source: AMrXdXtIgeH+VA+weYmPNdrUIWr9esmhdONILrZTG76ZLtZUYoZnqTIiZP/XNw67y2iSXOelveN0 X-Received: by 2002:a05:6402:3706:b0:499:70a8:f919 with SMTP id ek6-20020a056402370600b0049970a8f919mr14712158edb.32.1673539324627; Thu, 12 Jan 2023 08:02:04 -0800 (PST) ARC-Seal: i=1; a=rsa-sha256; t=1673539324; cv=none; d=google.com; s=arc-20160816; b=ASvtD0oWrqaYjB/jgIBdsHJrRygI5WpV3ENO45gU1mAKuAklgwI4opj/ld4CqUAc8O MfXCL8wPKamlVwLv0gr1BHbUJEvsl0yGNOBLST7NIda35PPhgrWG+MzIxOIsSWW0xyBV U7c5E6jSOxFC2QA+N27UvQjYVJSIcrtfz3HpKlLBc+AccXL8KlZx4E1TJCADjyujP5aK jQwOSM30T7TguFyrNty+YVNn+1U0p7oHdiQtIpBws1oKM+dWXrxFRihO3thqCp8ILlZa r7StGagFzSU+e8SQNfxiXYYQwiobwU8KF7HHCoodcZxfYFGchGXseMDTpnjuyXUn7tBw lZuw== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:to:from:subject:message-id:in-reply-to:date :mime-version; bh=M9Zf/miwcHLHdjuwhn1tof/VbQJRtjvI28zo155yc28=; b=VyjfSiUPXukxWkdDW8LVqo3VzLL0G9BaGrWW/5lsgxiWaGE5K7FrD2CFa5HiLWFxnY 1kU8ZmtB3FmUChxSn/gGv0RjpehGoYQIcBQPdiZxQ+0eV9NiIymeVSOOAJLtf47sW8fS ciETsS2TA8GlJbdAr31WVop7ylP98pMGds1Ax3xPnV2cr2r9TkCsHwqI03gPGXrtdu7h dxWcn2iyJ1Amxt5qTxrXmQUi+nM6TSoWTSslFeOAgInKr5GKr1qDc40ACR8nseiaxMjX mJbR86lxwIOUGvW9252tUJ23Fk2RGgigrzpeDAbiMPEYfQzzPYcULcmlwEAWUnTKEOdK 85Dg== ARC-Authentication-Results: i=1; mx.google.com; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=appspotmail.com Return-Path: Received: from out1.vger.email (out1.vger.email. [2620:137:e000::1:20]) by mx.google.com with ESMTP id e12-20020a056402190c00b0048e86e30ff1si23172357edz.194.2023.01.12.08.01.51; Thu, 12 Jan 2023 08:02:04 -0800 (PST) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; Authentication-Results: mx.google.com; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=appspotmail.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S240425AbjALPep (ORCPT + 50 others); Thu, 12 Jan 2023 10:34:45 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:50074 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233104AbjALPeN (ORCPT ); Thu, 12 Jan 2023 10:34:13 -0500 Received: from mail-io1-f72.google.com (mail-io1-f72.google.com [209.85.166.72]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id ED58661463 for ; Thu, 12 Jan 2023 07:24:57 -0800 (PST) Received: by mail-io1-f72.google.com with SMTP id u24-20020a6be918000000b006ed1e9ad302so11587972iof.22 for ; Thu, 12 Jan 2023 07:24:57 -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:in-reply-to:date:mime-version :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=M9Zf/miwcHLHdjuwhn1tof/VbQJRtjvI28zo155yc28=; b=ejLfCA9rOpevgHEwjpjTtsml4D2GeT0+u6rkoU9P4atP+bss5I7tbIYB8xpOy97EA9 EMvcNI9P7sBWEYptG437XQCQU9xU5UX0mrOK1qejTYkeH4faCqlefm813EyL0WdI+8x7 xLaiYr/Euoc7QdNn7NUiCMp9UeGAXXre9s0E+zyQqq6htHDxEY/Cfi2+DMojtYUVuoVW uAp189JdRWnWawcfJ8q2aQ+HS40LWgoPpWXCg4lnzlP1sNczvN78NStoPzsw8BA7SDKS mk2xhqXrHAxlrcy7upWOVoRaUDfY5yEoXQMR4ftICIkz6dfqQ152ZiwyqSI/PBMjiJrL G67w== X-Gm-Message-State: AFqh2kqNV6lxLnCqeYMJrjps8YMsDiwt3x70odyKmmbNW/uzmqvohnic WXlZVU4m+v9bYqHjkwdNCiNCVZbPYUYVESaB5hC3mM1y09Ns MIME-Version: 1.0 X-Received: by 2002:a6b:cd45:0:b0:6e2:ca58:69c with SMTP id d66-20020a6bcd45000000b006e2ca58069cmr6772959iog.42.1673537083294; Thu, 12 Jan 2023 07:24:43 -0800 (PST) Date: Thu, 12 Jan 2023 07:24:43 -0800 In-Reply-To: <000000000000cf0f4905f20e504c@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <0000000000005e4ea205f212b7ac@google.com> Subject: Re: [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" X-Spam-Status: No, score=-1.6 required=5.0 tests=BAYES_00,FROM_LOCAL_HEX, HEADER_FROM_DIFFERENT_DOMAINS,RCVD_IN_DNSWL_NONE,RCVD_IN_MSPIKE_H2, SPF_HELO_NONE,SPF_PASS autolearn=no autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org syzbot has found a reproducer for the following issue on: HEAD commit: 0a093b2893c7 Add linux-next specific files for 20230112 git tree: linux-next console+strace: https://syzkaller.appspot.com/x/log.txt?x=176167ba480000 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 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=17d58fbe480000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=151b0316480000 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 ffff8880793aa948 by task kworker/0:3/4401 CPU: 0 PID: 4401 Comm: kworker/0:3 Not tainted 6.2.0-rc3-next-20230112-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 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 5077: 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 31: 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 ffff8880793aa8c0 which belongs to the cache io_kiocb of size 216 The buggy address is located 136 bytes inside of 216-byte region [ffff8880793aa8c0, ffff8880793aa998) The buggy address belongs to the physical page: page:ffffea0001e4ea80 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x793aa flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000000200 ffff88814610fc80 dead000000000122 0000000000000000 raw: 0000000000000000 00000000800c000c 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Unmovable, gfp_mask 0x12cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY), pid 5077, tgid 5077 (syz-executor134), ts 60034717602, free_ts 59988620363 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_list+0x176/0xcd0 mm/page_alloc.c:3528 release_pages+0xcb1/0x1330 mm/swap.c:1072 tlb_batch_pages_flush+0xa8/0x1a0 mm/mmu_gather.c:97 tlb_flush_mmu_free mm/mmu_gather.c:292 [inline] tlb_flush_mmu mm/mmu_gather.c:299 [inline] tlb_finish_mmu+0x14b/0x7e0 mm/mmu_gather.c:391 exit_mmap+0x202/0x7c0 mm/mmap.c:3100 __mmput+0x128/0x4c0 kernel/fork.c:1212 mmput+0x60/0x70 kernel/fork.c:1234 exit_mm kernel/exit.c:563 [inline] do_exit+0x9ac/0x2a90 kernel/exit.c:854 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 irqentry_exit_to_user_mode+0x9/0x40 kernel/entry/common.c:310 exc_page_fault+0xc0/0x170 arch/x86/mm/fault.c:1557 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:570 Memory state around the buggy address: ffff8880793aa800: fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc fc ffff8880793aa880: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb >ffff8880793aa900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8880793aa980: fb fb fb fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8880793aaa00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================