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=-0.4 required=3.0 tests=FROM_LOCAL_HEX, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED autolearn=no 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 49303C5DF62 for ; Wed, 6 Nov 2019 12:30:15 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 2271421848 for ; Wed, 6 Nov 2019 12:30:15 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731265AbfKFMaO (ORCPT ); Wed, 6 Nov 2019 07:30:14 -0500 Received: from mail-il1-f197.google.com ([209.85.166.197]:45272 "EHLO mail-il1-f197.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728716AbfKFMaK (ORCPT ); Wed, 6 Nov 2019 07:30:10 -0500 Received: by mail-il1-f197.google.com with SMTP id n84so21350677ila.12 for ; Wed, 06 Nov 2019 04:30:10 -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:in-reply-to:message-id:subject :from:to; bh=iRhI5NwnBLucK2zozAdK0bz0+ws3CagjTnecUEM3SuU=; b=ObLmYGUtp1QEGBF+hl5ACBA0WrP/eYrRPePLkCw64LGgwGws/Gk8stAlaUiOZZ1pOV 5CF9mYqfyPjGcW0wJQnVoouEt7PRPZi4Ydf20EnMvd+DiffYfP5WorPfpIKvulY0T31P S6gtkDe6dlwOEQU9WyTymhEsKz+CbOIU26lgyWrjpm7s+UmIEVQOeQeVoPD6lcFlqOtK Ngw1MyDi7ivN88T2itlc4woHUKguxNOWkLFOb1J32bDnyNpoldxMSxfxxBs4jvdU6ziO m/iOHcjI1oHDri33KTYeaFnchEgsLiNEeG2vNFypHCxDZOn8L+ho29yV+OUGzyLjLWMk vVRg== X-Gm-Message-State: APjAAAV5qz3IaP2nYfXDOADtINLoLH69GrccAq/uPxdkmQMl/avSMWYH e/eQk8vHm8gwA6AySif4lnsyvItZEHyxfohVQlLUgIMj0QWY X-Google-Smtp-Source: APXvYqyugGD4OFrvktm1f/c9de8OeBgencviDpDWhJjtAxOyUpp629Pyg+KPjHDS8+yGrqEJt6HcrXRA6lDQDJjRcf7MiFynny/C MIME-Version: 1.0 X-Received: by 2002:a6b:3b50:: with SMTP id i77mr8192919ioa.241.1573043409910; Wed, 06 Nov 2019 04:30:09 -0800 (PST) Date: Wed, 06 Nov 2019 04:30:09 -0800 In-Reply-To: <000000000000b2de3a0594d8b4ca@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <000000000000aa02cb0596acb5fc@google.com> Subject: Re: WARNING in drm_mode_createblob_ioctl From: syzbot To: airlied@linux.ie, daniel@ffwll.ch, dri-devel@lists.freedesktop.org, dvyukov@google.com, linux-kernel@vger.kernel.org, maarten.lankhorst@linux.intel.com, mripard@kernel.org, sean@poorly.run, syzkaller-bugs@googlegroups.com 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 syzbot has found a reproducer for the following crash on: HEAD commit: 51309b9d Add linux-next specific files for 20191105 git tree: linux-next console output: https://syzkaller.appspot.com/x/log.txt?x=13f5c078e00000 kernel config: https://syzkaller.appspot.com/x/.config?x=a9b1a641c1f1fc52 dashboard link: https://syzkaller.appspot.com/bug?extid=fb77e97ebf0612ee6914 compiler: gcc (GCC) 9.0.0 20181231 (experimental) syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1212dc3ae00000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=145f604ae00000 IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+fb77e97ebf0612ee6914@syzkaller.appspotmail.com ------------[ cut here ]------------ WARNING: CPU: 0 PID: 8842 at include/linux/thread_info.h:150 check_copy_size include/linux/thread_info.h:150 [inline] WARNING: CPU: 0 PID: 8842 at include/linux/thread_info.h:150 copy_from_user include/linux/uaccess.h:143 [inline] WARNING: CPU: 0 PID: 8842 at include/linux/thread_info.h:150 drm_mode_createblob_ioctl+0x398/0x490 drivers/gpu/drm/drm_property.c:800 Kernel panic - not syncing: panic_on_warn set ... CPU: 0 PID: 8842 Comm: syz-executor938 Not tainted 5.4.0-rc6-next-20191105 #0 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+0x197/0x210 lib/dump_stack.c:118 panic+0x2e3/0x75c kernel/panic.c:221 __warn.cold+0x2f/0x35 kernel/panic.c:582 report_bug+0x289/0x300 lib/bug.c:195 fixup_bug arch/x86/kernel/traps.c:174 [inline] fixup_bug arch/x86/kernel/traps.c:169 [inline] do_error_trap+0x11b/0x200 arch/x86/kernel/traps.c:267 do_invalid_op+0x37/0x50 arch/x86/kernel/traps.c:286 invalid_op+0x23/0x30 arch/x86/entry/entry_64.S:1027 RIP: 0010:check_copy_size include/linux/thread_info.h:150 [inline] RIP: 0010:copy_from_user include/linux/uaccess.h:143 [inline] RIP: 0010:drm_mode_createblob_ioctl+0x398/0x490 drivers/gpu/drm/drm_property.c:800 Code: c1 ea 03 80 3c 02 00 0f 85 ed 00 00 00 49 89 5d 00 e8 0c f2 c6 fd 4c 89 f7 e8 24 af aa 03 31 c0 e9 75 fd ff ff e8 f8 f1 c6 fd <0f> 0b e8 f1 f1 c6 fd 4d 85 e4 b8 f2 ff ff ff 0f 84 5b fd ff ff 89 RSP: 0018:ffff8880a5e07aa8 EFLAGS: 00010293 RAX: ffff88809f3a0440 RBX: ffff8880a387c000 RCX: ffffffff83ac75e2 RDX: 0000000000000000 RSI: ffffffff83ac77a8 RDI: 0000000000000007 RBP: ffff8880a5e07ae8 R08: ffff88809f3a0440 R09: ffffed101470f910 R10: ffffed101470f90f R11: ffff8880a387c87f R12: ffffc90005f5d000 R13: ffff8880a4d78000 R14: 0000000096e170d0 R15: ffffc90005f5d058 drm_ioctl_kernel+0x244/0x300 drivers/gpu/drm/drm_ioctl.c:786 drm_ioctl+0x54e/0xa60 drivers/gpu/drm/drm_ioctl.c:886 vfs_ioctl fs/ioctl.c:47 [inline] file_ioctl fs/ioctl.c:545 [inline] do_vfs_ioctl+0x977/0x14e0 fs/ioctl.c:732 ksys_ioctl+0xab/0xd0 fs/ioctl.c:749 __do_sys_ioctl fs/ioctl.c:756 [inline] __se_sys_ioctl fs/ioctl.c:754 [inline] __x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:754 do_syscall_64+0xfa/0x760 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x449659 Code: e8 fc b8 02 00 48 83 c4 18 c3 0f 1f 80 00 00 00 00 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 ab d6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f6951f91db8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00000000006dac38 RCX: 0000000000449659 RDX: 0000000020000000 RSI: ffffffffffffffbd RDI: 0000000000000004 RBP: 00000000006dac30 R08: 00007f6951f92700 R09: 0000000000000000 R10: 00007f6951f92700 R11: 0000000000000246 R12: 00000000006dac3c R13: 00007ffeae0e7e9f R14: 00007f6951f929c0 R15: 20c49ba5e353f7cf Kernel Offset: disabled Rebooting in 86400 seconds..