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=-5.4 required=3.0 tests=FROM_LOCAL_HEX, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING, SPF_HELO_NONE,SPF_PASS 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 2C67BC3F2D7 for ; Fri, 6 Mar 2020 05:28:05 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id EEE832072D for ; Fri, 6 Mar 2020 05:28:04 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1725935AbgCFF1R (ORCPT ); Fri, 6 Mar 2020 00:27:17 -0500 Received: from mail-il1-f197.google.com ([209.85.166.197]:37731 "EHLO mail-il1-f197.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725853AbgCFF1R (ORCPT ); Fri, 6 Mar 2020 00:27:17 -0500 Received: by mail-il1-f197.google.com with SMTP id c3so96947ilm.4 for ; Thu, 05 Mar 2020 21:27:15 -0800 (PST) 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=XpNzTvzq5EHM5WEsacHC/1juJjuwUn9CLnulicmybuc=; b=GV1aWBmiMHcBC5kwf9U+RWwqR6WgcCl6SSr2+FWdfPRXWEcJTZeykSdxOWSlC4Clp4 Zx8EfRnZf41beTZMXyKdb3iThddeA885xmd/m0TKpMLdrYc70saTkyOJIeq1kvcigV3+ 9/JlHxsl06CikqXQhe3K3hMvoGc79CGGt3rr+U4jzu3Dj5+1DBVTAyRZup+uTo2GW0DC KEFecEh0tuGsRE35IJJGfgXNt4QYIdAhOYnjlEh0QbSYcNZ9MoE+HnagmgJAt8oRcNyR 9cU6qduqZl+zIc1fcbBQ6KG8L1dj6GArdf29txaG2Yq8JBiQHE5aTljhogdWwWtdNXGM 9I7g== X-Gm-Message-State: ANhLgQ3okt2z/ZOaY+mUIeSZE7KAa/eF+GeWpVRPxwGXdh3/leC9fG95 vTw+WpDtAD9u5Yn5zp2Sr8NvEpa1vzjrSB5nspJhIEeFBvoi X-Google-Smtp-Source: ADFU+vuha1tM16qQIo8iZp2i8jMWDrpAwS/MsWYB+cNdZz7WlQhBQsCtlwgaOjvqAY80jW+hFsFH2MiSpPJNqP0UjbWkRnlkETaf MIME-Version: 1.0 X-Received: by 2002:a02:85cc:: with SMTP id d70mr1359122jai.107.1583472433557; Thu, 05 Mar 2020 21:27:13 -0800 (PST) Date: Thu, 05 Mar 2020 21:27:13 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <000000000000e9fbaa05a028e759@google.com> Subject: BUG: unable to handle kernel NULL pointer dereference in do_syscall_64 (2) From: syzbot To: bp@alien8.de, hpa@zytor.com, linux-kernel@vger.kernel.org, luto@kernel.org, mingo@redhat.com, syzkaller-bugs@googlegroups.com, tglx@linutronix.de, x86@kernel.org Content-Type: text/plain; charset="UTF-8" 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: 63623fd4 Merge tag 'for-linus' of git://git.kernel.org/pub.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=11813529e00000 kernel config: https://syzkaller.appspot.com/x/.config?x=9833e26bab355358 dashboard link: https://syzkaller.appspot.com/bug?extid=d6d57d324860c94d5836 compiler: gcc (GCC) 9.0.0 20181231 (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+d6d57d324860c94d5836@syzkaller.appspotmail.com BUG: kernel NULL pointer dereference, address: 0000000000000000 #PF: supervisor write access in kernel mode #PF: error_code(0x0002) - not-present page PGD 464fa067 P4D 464fa067 PUD 94e6f067 PMD 0 Oops: 0002 [#1] PREEMPT SMP KASAN CPU: 0 PID: 410 Comm: syz-executor.3 Not tainted 5.6.0-rc3-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:prepare_exit_to_usermode arch/x86/entry/common.c:189 [inline] RIP: 0010:syscall_return_slowpath arch/x86/entry/common.c:278 [inline] RIP: 0010:do_syscall_64+0x2c9/0x790 arch/x86/entry/common.c:304 Code: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 <00> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 RSP: 0018:ffffc900073cff20 EFLAGS: 00010046 RAX: 0000000000000000 RBX: ffff888054c1e200 RCX: ffffffff8100a857 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000001 RBP: ffffc900073cff48 R08: ffff888054c1e200 R09: ffffed100a983c41 R10: ffffed100a983c40 R11: ffff888054c1e207 R12: ffffc900073cff58 R13: 0000000000000000 R14: 0000000000004000 R15: 0000000000000000 FS: 000000000285a940(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 0000000047f4e000 CR4: 00000000001426f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: entry_SYSCALL_64_after_hwframe+0x49/0xbe invalid opcode: 0000 [#2] PREEMPT SMP KASAN CPU: 0 PID: 410 Comm: syz-executor.3 Not tainted 5.6.0-rc3-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:in_gate_area_no_mm+0x3a/0x70 arch/x86/entry/vsyscall/vsyscall_64.c:344 Code: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 <60> ff 48 89 de e8 7c b7 74 00 48 81 fb 00 00 60 ff 74 10 e8 ce b5 RSP: 0018:ffffc900073cf398 EFLAGS: 00010046 RAX: ffff888054c1e200 RBX: 0000000000000000 RCX: ffffffff816c3c90 RDX: 0000000000000000 RSI: ffffffff816c3cbb RDI: 000000000045a941 RBP: ffffc900073cf3d8 R08: ffff888054c1e200 R09: fffffbfff1708c62 R10: fffffbfff1708c61 R11: ffffffff8b846309 R12: 000000000045a941 R13: ffffc900073cf458 R14: ffffc900073cf538 R15: ffffc900073cf438 FS: 000000000285a940(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 0000000047f4e000 CR4: 00000000001426f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __sprint_symbol+0xb7/0x1e0 kernel/kallsyms.c:365 sprint_symbol+0x25/0x30 kernel/kallsyms.c:396 symbol_string+0x16f/0x230 lib/vsprintf.c:961 pointer+0x17b/0x740 lib/vsprintf.c:2188 vsnprintf+0x6b6/0x19a0 lib/vsprintf.c:2578 vscnprintf+0x2d/0x80 lib/vsprintf.c:2677 vprintk_store+0x44/0x4a0 kernel/printk/printk.c:1917 vprintk_emit+0x135/0x700 kernel/printk/printk.c:1978 vprintk_default+0x28/0x30 kernel/printk/printk.c:2023 vprintk_func+0x7e/0x189 kernel/printk/printk_safe.c:386 printk+0xba/0xed kernel/printk/printk.c:2056 show_ip+0x27/0x38 arch/x86/kernel/dumpstack.c:124 show_iret_regs+0x14/0x38 arch/x86/kernel/dumpstack.c:131 __show_regs+0x1c/0x60 arch/x86/kernel/process_64.c:74 show_regs_if_on_stack.constprop.0+0x39/0x3c arch/x86/kernel/dumpstack.c:149 show_trace_log_lvl+0x25d/0x28c arch/x86/kernel/dumpstack.c:274 show_regs arch/x86/kernel/dumpstack.c:447 [inline] show_regs.cold+0x1a/0x1f arch/x86/kernel/dumpstack.c:437 __die_body+0x1b/0x60 arch/x86/kernel/dumpstack.c:392 __die+0x26/0x37 arch/x86/kernel/dumpstack.c:406 no_context+0x596/0xa30 arch/x86/mm/fault.c:821 __bad_area_nosemaphore+0xae/0x420 arch/x86/mm/fault.c:913 __bad_area arch/x86/mm/fault.c:934 [inline] bad_area+0x69/0x80 arch/x86/mm/fault.c:940 do_user_addr_fault arch/x86/mm/fault.c:1405 [inline] do_page_fault+0xc17/0x12e1 arch/x86/mm/fault.c:1517 page_fault+0x39/0x40 arch/x86/entry/entry_64.S:1203 RIP: 0010:prepare_exit_to_usermode arch/x86/entry/common.c:189 [inline] RIP: 0010:syscall_return_slowpath arch/x86/entry/common.c:278 [inline] RIP: 0010:do_syscall_64+0x2c9/0x790 arch/x86/entry/common.c:304 Code: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 <00> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 RSP: 0018:ffffc900073cff20 EFLAGS: 00010046 RAX: 0000000000000000 RBX: ffff888054c1e200 RCX: ffffffff8100a857 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000001 RBP: ffffc900073cff48 R08: ffff888054c1e200 R09: ffffed100a983c41 R10: ffffed100a983c40 R11: ffff888054c1e207 R12: ffffc900073cff58 R13: 0000000000000000 R14: 0000000000004000 R15: 0000000000000000 entry_SYSCALL_64_after_hwframe+0x49/0xbe invalid opcode: 0000 [#3] PREEMPT SMP KASAN CPU: 0 PID: 410 Comm: syz-executor.3 Not tainted 5.6.0-rc3-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:in_gate_area_no_mm+0x3a/0x70 arch/x86/entry/vsyscall/vsyscall_64.c:344 Code: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 <60> ff 48 89 de e8 7c b7 74 00 48 81 fb 00 00 60 ff 74 10 e8 ce b5 RSP: 0018:ffffc900073ce920 EFLAGS: 00010046 RAX: ffff888054c1e200 RBX: 0000000000000000 RCX: ffffffff816c3c90 RDX: 0000000000000000 RSI: ffffffff816c3cbb RDI: 000000000045a941 RBP: ffffc900073ce960 R08: ffff888054c1e200 R09: ffffed1015d04b78 R10: ffffed1015d04b77 R11: ffff8880ae825bb9 R12: 000000000045a941 R13: ffffc900073ce9e0 R14: ffffc900073ceac0 R15: ffffc900073ce9c0 FS: 000000000285a940(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 0000000047f4e000 CR4: 00000000001426f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __sprint_symbol+0xb7/0x1e0 kernel/kallsyms.c:365 sprint_symbol+0x25/0x30 kernel/kallsyms.c:396 symbol_string+0x16f/0x230 lib/vsprintf.c:961 pointer+0x17b/0x740 lib/vsprintf.c:2188 vsnprintf+0x6b6/0x19a0 lib/vsprintf.c:2578 vscnprintf+0x2d/0x80 lib/vsprintf.c:2677 printk_safe_log_store+0x106/0x270 kernel/printk/printk_safe.c:93 vprintk_safe kernel/printk/printk_safe.c:346 [inline] vprintk_func+0x131/0x189 kernel/printk/printk_safe.c:383 printk+0xba/0xed kernel/printk/printk.c:2056 show_ip+0x27/0x38 arch/x86/kernel/dumpstack.c:124 show_iret_regs+0x14/0x38 arch/x86/kernel/dumpstack.c:131 __show_regs+0x1c/0x60 arch/x86/kernel/process_64.c:74 show_regs_if_on_stack.constprop.0+0x39/0x3c arch/x86/kernel/dumpstack.c:149 show_trace_log_lvl+0x25d/0x28c arch/x86/kernel/dumpstack.c:274 show_regs arch/x86/kernel/dumpstack.c:447 [inline] show_regs.cold+0x1a/0x1f arch/x86/kernel/dumpstack.c:437 __die_body+0x1b/0x60 arch/x86/kernel/dumpstack.c:392 __die+0x26/0x37 arch/x86/kernel/dumpstack.c:406 die+0x2b/0x50 arch/x86/kernel/dumpstack.c:419 do_trap_no_signal arch/x86/kernel/traps.c:207 [inline] do_trap+0x101/0x230 arch/x86/kernel/traps.c:246 do_error_trap+0xd6/0x200 arch/x86/kernel/traps.c:273 do_invalid_op+0x37/0x50 arch/x86/kernel/traps.c:286 invalid_op+0x23/0x30 arch/x86/entry/entry_64.S:1027 RIP: 0010:in_gate_area_no_mm+0x3a/0x70 arch/x86/entry/vsyscall/vsyscall_64.c:344 Code: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 <60> ff 48 89 de e8 7c b7 74 00 48 81 fb 00 00 60 ff 74 10 e8 ce b5 RSP: 0018:ffffc900073cf398 EFLAGS: 00010046 RAX: ffff888054c1e200 RBX: 0000000000000000 RCX: ffffffff816c3c90 RDX: 0000000000000000 RSI: ffffffff816c3cbb RDI: 000000000045a941 RBP: ffffc900073cf3d8 R08: ffff888054c1e200 R09: fffffbfff1708c62 R10: fffffbfff1708c61 R11: ffffffff8b846309 R12: 000000000045a941 R13: ffffc900073cf458 R14: ffffc900073cf538 R15: ffffc900073cf438 __sprint_symbol+0xb7/0x1e0 kernel/kallsyms.c:365 sprint_symbol+0x25/0x30 kernel/kallsyms.c:396 symbol_string+0x16f/0x230 lib/vsprintf.c:961 pointer+0x17b/0x740 lib/vsprintf.c:2188 vsnprintf+0x6b6/0x19a0 lib/vsprintf.c:2578 vscnprintf+0x2d/0x80 lib/vsprintf.c:2677 vprintk_store+0x44/0x4a0 kernel/printk/printk.c:1917 vprintk_emit+0x135/0x700 kernel/printk/printk.c:1978 vprintk_default+0x28/0x30 kernel/printk/printk.c:2023 vprintk_func+0x7e/0x189 kernel/printk/printk_safe.c:386 printk+0xba/0xed kernel/printk/printk.c:2056 show_ip+0x27/0x38 arch/x86/kernel/dumpstack.c:124 show_iret_regs+0x14/0x38 arch/x86/kernel/dumpstack.c:131 __show_regs+0x1c/0x60 arch/x86/kernel/process_64.c:74 show_regs_if_on_stack.constprop.0+0x39/0x3c arch/x86/kernel/dumpstack.c:149 show_trace_log_lvl+0x25d/0x28c arch/x86/kernel/dumpstack.c:274 show_regs arch/x86/kernel/dumpstack.c:447 [inline] show_regs.cold+0x1a/0x1f arch/x86/kernel/dumpstack.c:437 __die_body+0x1b/0x60 arch/x86/kernel/dumpstack.c:392 __die+0x26/0x37 arch/x86/kernel/dumpstack.c:406 no_context+0x596/0xa30 arch/x86/mm/fault.c:821 __bad_area_nosemaphore+0xae/0x420 arch/x86/mm/fault.c:913 bad_a Lost 42 message(s)! --- This bug is generated by a bot. 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