From mboxrd@z Thu Jan 1 00:00:00 1970 From: syzbot Subject: Re: WARNING in drm_mode_createblob_ioctl Date: Wed, 06 Nov 2019 04:30:09 -0800 Message-ID: <000000000000aa02cb0596acb5fc@google.com> References: <000000000000b2de3a0594d8b4ca@google.com> Mime-Version: 1.0 Content-Type: text/plain; charset="UTF-8"; format=flowed; delsp=yes Return-path: In-Reply-To: <000000000000b2de3a0594d8b4ca@google.com> Sender: linux-kernel-owner@vger.kernel.org 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 List-Id: dri-devel@lists.freedesktop.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.. 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mail.kernel.org; spf=none smtp.mailfrom=dri-devel-bounces@lists.freedesktop.org Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id E76CD6EE9D; Thu, 7 Nov 2019 07:43:24 +0000 (UTC) Received: from mail-il1-f197.google.com (mail-il1-f197.google.com [209.85.166.197]) by gabe.freedesktop.org (Postfix) with ESMTPS id D4EA76ED0D for ; Wed, 6 Nov 2019 12:30:10 +0000 (UTC) Received: by mail-il1-f197.google.com with SMTP id y17so9449013ila.20 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=Lf2k1tDO59NCLeM7KoePsGnJ6UKdx2oekuHn21t53KL9c1pCHZHCm6nuRNJqNxwEaT ex8z4sO7OwOvg/OpfXnAS402DqeMSJTtBr+gkvMzSxiRQIg2zZaV9iNmTuCHBIPGWttr +f0REYup1LOGZi4Ui7EdNS+yPXZdv5t1f3eXx3kgGNNXmZDBUwwBjTncfxMbesPonVws te6ddRrrkq9kSin3ZUhXt312TuIhJJtcg7fn8MDIpjGYMPMRY3v3alRpRti56D2rLcQB YC0Nx1DN9JkQK0as8/rwpoUnC+p0s5jdcVlfYLj4XhMLQwtU3xBEFbZ8EdDv4W6qocE0 W6+A== X-Gm-Message-State: APjAAAUiKQwb8v3Y4dGwNAjgIArPny1LL7e+IjuFbJ9X7f6b6lvw+9m3 gphDTcEPiTcS37RzkewYIxQy3ur0VPv/WZIL11mWT1bjfEhN 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 X-Mailman-Approved-At: Thu, 07 Nov 2019 07:43:23 +0000 X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Transfer-Encoding: base64 Content-Type: text/plain; charset="utf-8"; Format="flowed"; DelSp="yes" Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" Message-ID: <20191106123009.mKy942IEWsGX8yD96EJ_2tSv2fQqh4oqrvQtrFI8c-c@z> c3l6Ym90IGhhcyBmb3VuZCBhIHJlcHJvZHVjZXIgZm9yIHRoZSBmb2xsb3dpbmcgY3Jhc2ggb246 CgpIRUFEIGNvbW1pdDogICAgNTEzMDliOWQgQWRkIGxpbnV4LW5leHQgc3BlY2lmaWMgZmlsZXMg Zm9yIDIwMTkxMTA1CmdpdCB0cmVlOiAgICAgICBsaW51eC1uZXh0CmNvbnNvbGUgb3V0cHV0OiBo dHRwczovL3N5emthbGxlci5hcHBzcG90LmNvbS94L2xvZy50eHQ/eD0xM2Y1YzA3OGUwMDAwMApr ZXJuZWwgY29uZmlnOiAgaHR0cHM6Ly9zeXprYWxsZXIuYXBwc3BvdC5jb20veC8uY29uZmlnP3g9 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