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Tue, 25 Aug 2020 00:48:30 +0000 Subject: Re: general protection fault in security_inode_getattr To: syzbot , , , , , , , , , , , , , , , , , , References: <00000000000020e49105ada8d598@google.com> From: Yonghong Song Message-ID: <516ee4af-0db1-9069-bb06-e89216ab49c8@fb.com> Date: Mon, 24 Aug 2020 17:48:24 -0700 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:68.0) Gecko/20100101 Thunderbird/68.11.0 In-Reply-To: <00000000000020e49105ada8d598@google.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit X-ClientProxiedBy: BL0PR05CA0003.namprd05.prod.outlook.com (2603:10b6:208:91::13) To BYAPR15MB4088.namprd15.prod.outlook.com (2603:10b6:a02:c3::18) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from 255.255.255.255 (255.255.255.255) by BL0PR05CA0003.namprd05.prod.outlook.com (2603:10b6:208:91::13) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.3326.10 via Frontend Transport; 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X-MS-Exchange-AntiSpam-MessageData: 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 X-MS-Exchange-CrossTenant-Network-Message-Id: b62a3b81-b2d7-4edd-20e9-08d8489095c2 X-MS-Exchange-CrossTenant-AuthSource: BYAPR15MB4088.namprd15.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 25 Aug 2020 00:48:30.0481 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 8ae927fe-1255-47a7-a2af-5f3a069daaa2 X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: 9zNy4Cdlu9+SPXzI++uI49f73bCMis3EVu9n2yEtvdzczkNn8FF3+S61EhPsc8tQ X-MS-Exchange-Transport-CrossTenantHeadersStamped: BYAPR15MB2775 X-OriginatorOrg: fb.com X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.235,18.0.687 definitions=2020-08-24_12:2020-08-24,2020-08-24 signatures=0 X-Proofpoint-Spam-Details: rule=fb_default_notspam policy=fb_default score=0 mlxscore=0 adultscore=0 bulkscore=0 lowpriorityscore=0 impostorscore=0 malwarescore=0 mlxlogscore=623 phishscore=0 clxscore=1011 spamscore=0 suspectscore=0 priorityscore=1501 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2006250000 definitions=main-2008250004 X-FB-Internal: deliver Sender: owner-linux-security-module@vger.kernel.org Precedence: bulk List-ID: On 8/24/20 5:32 PM, syzbot wrote: > syzbot has bisected this issue to: > > commit 35697c12d7ffd31a56d3c9604066a166b75d0169 > Author: Yonghong Song > Date: Thu Jan 16 17:40:04 2020 +0000 > > selftests/bpf: Fix test_progs send_signal flakiness with nmi mode The above patch changed file: tools/testing/selftests/bpf/prog_tests/send_signal.c It is unlikely it caused the issue. > > bisection log: https://urldefense.proofpoint.com/v2/url?u=https-3A__syzkaller.appspot.com_x_bisect.txt-3Fx-3D13032139900000&d=DwIBaQ&c=5VD0RTtNlTh3ycd41b3MUw&r=DA8e1B5r073vIqRrFz7MRA&m=854z77F3pbTpgGUCFUwM1OSEUj4NbiNIZsaad0Xg4qc&s=Le6D_jfzkec28_qNhbUwMesaUeBGaKEG6RLN3ZCzE1s&e= > start commit: d012a719 Linux 5.9-rc2 > git tree: upstream > final oops: https://urldefense.proofpoint.com/v2/url?u=https-3A__syzkaller.appspot.com_x_report.txt-3Fx-3D10832139900000&d=DwIBaQ&c=5VD0RTtNlTh3ycd41b3MUw&r=DA8e1B5r073vIqRrFz7MRA&m=854z77F3pbTpgGUCFUwM1OSEUj4NbiNIZsaad0Xg4qc&s=VbLXb22TgxAtiPQTEq0t5r0WgNDiFwstWKnme0tWBLE&e= > console output: https://urldefense.proofpoint.com/v2/url?u=https-3A__syzkaller.appspot.com_x_log.txt-3Fx-3D17032139900000&d=DwIBaQ&c=5VD0RTtNlTh3ycd41b3MUw&r=DA8e1B5r073vIqRrFz7MRA&m=854z77F3pbTpgGUCFUwM1OSEUj4NbiNIZsaad0Xg4qc&s=yu72HnqjHzOTtJ5dyD7q0QW9sOwEO6pPHjeYTTutKdc&e= > kernel config: https://urldefense.proofpoint.com/v2/url?u=https-3A__syzkaller.appspot.com_x_.config-3Fx-3D891ca5711a9f1650&d=DwIBaQ&c=5VD0RTtNlTh3ycd41b3MUw&r=DA8e1B5r073vIqRrFz7MRA&m=854z77F3pbTpgGUCFUwM1OSEUj4NbiNIZsaad0Xg4qc&s=6cylIRBZjHQmgkJQoofuLN2XSifb-13qrrj58PQpBYs&e= > dashboard link: https://urldefense.proofpoint.com/v2/url?u=https-3A__syzkaller.appspot.com_bug-3Fextid-3Df07cc9be8d1d226947ed&d=DwIBaQ&c=5VD0RTtNlTh3ycd41b3MUw&r=DA8e1B5r073vIqRrFz7MRA&m=854z77F3pbTpgGUCFUwM1OSEUj4NbiNIZsaad0Xg4qc&s=siCrm2aO-fzR3Nym_zaPQQnmxMlJo0bRj87zgm7o5mY&e= > syz repro: https://urldefense.proofpoint.com/v2/url?u=https-3A__syzkaller.appspot.com_x_repro.syz-3Fx-3D104a650e900000&d=DwIBaQ&c=5VD0RTtNlTh3ycd41b3MUw&r=DA8e1B5r073vIqRrFz7MRA&m=854z77F3pbTpgGUCFUwM1OSEUj4NbiNIZsaad0Xg4qc&s=yNEvyRe2bO4AKgq2UuJc32katp4k4UGKwMUDEBlhM7E&e= > > Reported-by: syzbot+f07cc9be8d1d226947ed@syzkaller.appspotmail.com > Fixes: 35697c12d7ff ("selftests/bpf: Fix test_progs send_signal flakiness with nmi mode") > > For information about bisection process see: https://urldefense.proofpoint.com/v2/url?u=https-3A__goo.gl_tpsmEJ-23bisection&d=DwIBaQ&c=5VD0RTtNlTh3ycd41b3MUw&r=DA8e1B5r073vIqRrFz7MRA&m=854z77F3pbTpgGUCFUwM1OSEUj4NbiNIZsaad0Xg4qc&s=K4KdZK8rBgxDv4M9uwEndkCB4mCatTH-opwefN-0b-M&e= >