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=-0.7 required=3.0 tests=FROM_LOCAL_HEX, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_PASS,URIBL_BLOCKED autolearn=ham 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 6AF58C4321D for ; Tue, 21 Aug 2018 15:24:11 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 27914217BE for ; Tue, 21 Aug 2018 15:24:11 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 27914217BE Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727824AbeHUSoo (ORCPT ); Tue, 21 Aug 2018 14:44:44 -0400 Received: from mail-io0-f199.google.com ([209.85.223.199]:55484 "EHLO mail-io0-f199.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727498AbeHUSoj (ORCPT ); Tue, 21 Aug 2018 14:44:39 -0400 Received: by mail-io0-f199.google.com with SMTP id m15-v6so3526681ioj.22 for ; Tue, 21 Aug 2018 08:24:03 -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=xDyFo747txhxyPwAV7w1MbW9TxQuUjOYeQ95xs6an3Y=; b=nZyGEZo8bINM96Yv2EpLl9llGroAc6i/wGS0p0HKPL5/D8/OV3lo7t3UxmLddOT1qd XM0BYAXLLR0lZW9vWnefasKU3DnEK8TXcd6qx5hKpSUcFpOvkkecnpS42JHLztbAJteb 7tAl6U6/lDq0tpo5WeDbRkgHtMgBM7gDIrleRb3E0n0YiZQS1F5A6TP/W6XBkuEFyqfK 5HDQFekXAh4HdLHVryvF7foubpPZvW2mzrmu7hJD4S3nu3SFBIBrqpU+Vm4cLrEa8/PS jNYcoXiRaNWJhZB18ZqTk4uT3QzR1XPhcCMcwRrPmNvRJf+oR5l21+RgVq/KGclFQOS8 YsLQ== X-Gm-Message-State: AOUpUlFyB4Kq8lH0MIMCnp7Bvu7O1TASmBCsbxI0pKen29+8WZf1aF+p cokwrmFXnpNLZyLUd5drfvUig+OCDk+++/2PGppox0w/Jqnt X-Google-Smtp-Source: AA+uWPxDR2wlZicfFuosqfS/3aexRA1OfkkJSMweUKF80xxXWaMGJ/ArMMhMQMPCmioOTQTIbKxjVVjvZZu0Gv6sWK4tqEhDML6K MIME-Version: 1.0 X-Received: by 2002:a24:3cc3:: with SMTP id m186-v6mr8150785ita.30.1534865043236; Tue, 21 Aug 2018 08:24:03 -0700 (PDT) Date: Tue, 21 Aug 2018 08:24:03 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <000000000000ae329e0573f39d2c@google.com> Subject: KASAN: use-after-free Read in __loaded_vmcs_clear From: syzbot To: hpa@zytor.com, kvm@vger.kernel.org, linux-kernel@vger.kernel.org, mingo@redhat.com, pbonzini@redhat.com, rkrcmar@redhat.com, syzkaller-bugs@googlegroups.com, tglx@linutronix.de, x86@kernel.org Content-Type: text/plain; charset="UTF-8"; format=flowed; delsp=yes Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hello, syzbot found the following crash on: HEAD commit: cc26ebbebde8 ia64: Fix kernel BUG at lib/ioremap.c:72! git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=144c89de400000 kernel config: https://syzkaller.appspot.com/x/.config?x=79e695838ce7a210 dashboard link: https://syzkaller.appspot.com/bug?extid=c26aa916bc6caa4853dd compiler: gcc (GCC) 8.0.1 20180413 (experimental) Unfortunately, I don't have any reproducer for this crash yet. IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+c26aa916bc6caa4853dd@syzkaller.appspotmail.com RDX: 0000000000000000 RSI: 000000000000ae01 RDI: 0000000000000006 RBP: 00000000009300a0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000004ce9b8 R14: 00000000004c50d7 R15: 0000000000000000 ================================================================== BUG: KASAN: use-after-free in __list_del_entry_valid+0xf1/0xf3 lib/list_debug.c:51 Read of size 8 at addr ffff880191f766e0 by task syz-executor3/1383 CPU: 1 PID: 1383 Comm: syz-executor3 Not tainted 4.18.0+ #199 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1c9/0x2b4 lib/dump_stack.c:113 print_address_description+0x6c/0x20b mm/kasan/report.c:256 kasan_report_error mm/kasan/report.c:354 [inline] kasan_report.cold.7+0x242/0x30d mm/kasan/report.c:412 __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:433 __list_del_entry_valid+0xf1/0xf3 lib/list_debug.c:51 __list_del_entry include/linux/list.h:117 [inline] list_del include/linux/list.h:125 [inline] __loaded_vmcs_clear+0x14f/0x630 arch/x86/kvm/vmx.c:2187 flush_smp_call_function_queue+0x1a8/0x5e0 kernel/smp.c:243 generic_smp_call_function_single_interrupt+0x13/0x2b kernel/smp.c:192 smp_call_function_single_interrupt+0x11a/0x670 arch/x86/kernel/smp.c:296 call_function_single_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:886 RIP: 0010:arch_local_irq_restore+0x4a/0x52 arch/x86/include/asm/paravirt.h:783 Code: 48 c1 ea 03 80 3c 02 00 74 05 e8 b9 ef 0b fb 48 83 3d a9 53 41 01 00 75 07 e8 9a f8 cc fa 0f 0b e8 93 f8 cc fa 48 89 df 57 9d <0f> 1f 44 00 00 5b 5d c3 4c 89 45 d0 e8 6d ef 0b fb 4c 8b 45 d0 e9 RSP: 0018:ffff8801cc1fef90 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff04 RAX: 0000000000040000 RBX: 0000000000000246 RCX: ffffc9000341f000 RDX: 0000000000040000 RSI: ffffffff86b0690d RDI: 0000000000000246 RBP: ffff8801cc1fef98 R08: ffff88018a440df8 R09: 0000000000000006 R10: ffff88018a4405c0 R11: 0000000000000000 R12: 0000000000000200 R13: 1ffff1003983fdfc R14: ffffffff87f1bca0 R15: 00000000ffffffff dump_stack+0x273/0x2b4 lib/dump_stack.c:118 vmwrite_error+0x4c/0x60 arch/x86/kvm/vmx.c:2352 __vmcs_writel arch/x86/kvm/vmx.c:2362 [inline] vmcs_writel arch/x86/kvm/vmx.c:2402 [inline] vmx_vcpu_load+0xcad/0xfe0 arch/x86/kvm/vmx.c:3085 kvm_arch_vcpu_load+0x22b/0x940 arch/x86/kvm/x86.c:3106 kvm_sched_in+0x82/0xa0 arch/x86/kvm/../../../virt/kvm/kvm_main.c:3970 __fire_sched_in_preempt_notifiers kernel/sched/core.c:2481 [inline] fire_sched_in_preempt_notifiers kernel/sched/core.c:2487 [inline] finish_task_switch+0x50d/0x870 kernel/sched/core.c:2679 context_switch kernel/sched/core.c:2826 [inline] __schedule+0x884/0x1ec0 kernel/sched/core.c:3471 preempt_schedule_common+0x22/0x60 kernel/sched/core.c:3595 _cond_resched+0x1d/0x30 kernel/sched/core.c:4961 slab_pre_alloc_hook mm/slab.h:421 [inline] slab_alloc mm/slab.c:3378 [inline] kmem_cache_alloc+0x2a5/0x760 mm/slab.c:3552 alloc_inode+0xb2/0x190 fs/inode.c:212 new_inode_pseudo+0x71/0x1a0 fs/inode.c:903 new_inode+0x1c/0x40 fs/inode.c:932 debugfs_get_inode+0x19/0x120 fs/debugfs/inode.c:37 __debugfs_create_file+0xb5/0x400 fs/debugfs/inode.c:352 debugfs_create_file+0x57/0x70 fs/debugfs/inode.c:399 kvm_create_vm_debugfs arch/x86/kvm/../../../virt/kvm/kvm_main.c:615 [inline] kvm_dev_ioctl_create_vm arch/x86/kvm/../../../virt/kvm/kvm_main.c:3209 [inline] kvm_dev_ioctl+0xbf5/0x1b10 arch/x86/kvm/../../../virt/kvm/kvm_main.c:3236 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:500 [inline] do_vfs_ioctl+0x1de/0x1720 fs/ioctl.c:684 ksys_ioctl+0xa9/0xd0 fs/ioctl.c:701 __do_sys_ioctl fs/ioctl.c:708 [inline] __se_sys_ioctl fs/ioctl.c:706 [inline] __x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:706 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x457089 Code: fd b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 cb b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fdd4b708c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007fdd4b7096d4 RCX: 0000000000457089 RDX: 0000000000000000 RSI: 000000000000ae01 RDI: 0000000000000006 RBP: 00000000009300a0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000004ce9b8 R14: 00000000004c50d7 R15: 0000000000000000 Allocated by task 1383: save_stack+0x43/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] kasan_kmalloc+0xc4/0xe0 mm/kasan/kasan.c:553 kasan_slab_alloc+0x12/0x20 mm/kasan/kasan.c:490 kmem_cache_alloc+0x12e/0x760 mm/slab.c:3554 kmem_cache_zalloc include/linux/slab.h:697 [inline] vmx_create_vcpu+0xcf/0x27c0 arch/x86/kvm/vmx.c:10926 kvm_arch_vcpu_create+0xe5/0x220 arch/x86/kvm/x86.c:8433 kvm_vm_ioctl_create_vcpu arch/x86/kvm/../../../virt/kvm/kvm_main.c:2471 [inline] kvm_vm_ioctl+0x488/0x1d80 arch/x86/kvm/../../../virt/kvm/kvm_main.c:2972 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:500 [inline] do_vfs_ioctl+0x1de/0x1720 fs/ioctl.c:684 ksys_ioctl+0xa9/0xd0 fs/ioctl.c:701 __do_sys_ioctl fs/ioctl.c:708 [inline] __se_sys_ioctl fs/ioctl.c:706 [inline] __x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:706 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 1374: save_stack+0x43/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] __kasan_slab_free+0x11a/0x170 mm/kasan/kasan.c:521 kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:528 __cache_free mm/slab.c:3498 [inline] kmem_cache_free+0x86/0x2d0 mm/slab.c:3756 vmx_free_vcpu+0x26b/0x300 arch/x86/kvm/vmx.c:10920 kvm_arch_vcpu_free arch/x86/kvm/x86.c:8419 [inline] kvm_free_vcpus arch/x86/kvm/x86.c:8869 [inline] kvm_arch_destroy_vm+0x365/0x7c0 arch/x86/kvm/x86.c:8966 kvm_destroy_vm arch/x86/kvm/../../../virt/kvm/kvm_main.c:747 [inline] kvm_put_kvm+0x73f/0x1060 arch/x86/kvm/../../../virt/kvm/kvm_main.c:768 kvm_vcpu_release+0x7b/0xa0 arch/x86/kvm/../../../virt/kvm/kvm_main.c:2402 __fput+0x39b/0x860 fs/file_table.c:251 ____fput+0x15/0x20 fs/file_table.c:282 task_work_run+0x1e8/0x2a0 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:193 [inline] exit_to_usermode_loop+0x318/0x380 arch/x86/entry/common.c:166 prepare_exit_to_usermode arch/x86/entry/common.c:197 [inline] syscall_return_slowpath arch/x86/entry/common.c:268 [inline] do_syscall_64+0x6be/0x820 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe The buggy address belongs to the object at ffff880191f70f40 which belongs to the cache kvm_vcpu(17:syz3) of size 23872 The buggy address is located 22432 bytes inside of 23872-byte region [ffff880191f70f40, ffff880191f76c80) The buggy address belongs to the page: page:ffffea000647dc00 count:1 mapcount:0 mapping:ffff8801b4ea0c80 index:0x0 compound_mapcount: 0 flags: 0x2fffc0000008100(slab|head) raw: 02fffc0000008100 ffffea00064da208 ffffea00066ad408 ffff8801b4ea0c80 raw: 0000000000000000 ffff880191f70f40 0000000100000001 ffff8801d055a1c0 page dumped because: kasan: bad access detected page->mem_cgroup:ffff8801d055a1c0 Memory state around the buggy address: ffff880191f76580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff880191f76600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb > ffff880191f76680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff880191f76700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff880191f76780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== --- This bug 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 bug report. See: https://goo.gl/tpsmEJ#bug-status-tracking for how to communicate with syzbot.