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Thu, 25 Jun 2020 13:26:47 +0000 Received: from b06wcsmtp001.portsmouth.uk.ibm.com (b06wcsmtp001.portsmouth.uk.ibm.com [9.149.105.160]) by b06avi18626390.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 05PDPPVE56295860 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Thu, 25 Jun 2020 13:25:26 GMT Received: from b06wcsmtp001.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id D9D12A405F; Thu, 25 Jun 2020 13:26:44 +0000 (GMT) Received: from b06wcsmtp001.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 888DDA4065; Thu, 25 Jun 2020 13:26:43 +0000 (GMT) Received: from oc7455500831.ibm.com (unknown [9.145.23.225]) by b06wcsmtp001.portsmouth.uk.ibm.com (Postfix) with ESMTP; Thu, 25 Jun 2020 13:26:43 +0000 (GMT) Subject: Re: linux-next: umh: fix processed error when UMH_WAIT_PROC is used seems to break linux bridge on s390x (bisected) From: Christian Borntraeger To: Luis Chamberlain Cc: Christoph Hellwig , ast@kernel.org, axboe@kernel.dk, bfields@fieldses.org, bridge@lists.linux-foundation.org, chainsaw@gentoo.org, christian.brauner@ubuntu.com, chuck.lever@oracle.com, davem@davemloft.net, dhowells@redhat.com, gregkh@linuxfoundation.org, jarkko.sakkinen@linux.intel.com, jmorris@namei.org, josh@joshtriplett.org, keescook@chromium.org, keyrings@vger.kernel.org, kuba@kernel.org, lars.ellenberg@linbit.com, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, linux-nfs@vger.kernel.org, linux-security-module@vger.kernel.org, nikolay@cumulusnetworks.com, philipp.reisner@linbit.com, ravenexp@gmail.com, roopa@cumulusnetworks.com, serge@hallyn.com, slyfox@gentoo.org, viro@zeniv.linux.org.uk, yangtiezhu@loongson.cn, netdev@vger.kernel.org, markward@linux.ibm.com, linux-s390 References: <20200610154923.27510-5-mcgrof@kernel.org> <20200623141157.5409-1-borntraeger@de.ibm.com> <3118dc0d-a3af-9337-c897-2380062a8644@de.ibm.com> <20200624144311.GA5839@infradead.org> <9e767819-9bbe-2181-521e-4d8ca28ca4f7@de.ibm.com> <20200624160953.GH4332@42.do-not-panic.com> <4e27098e-ac8d-98f0-3a9a-ea25242e24ec@de.ibm.com> <4d8fbcea-a892-3453-091f-d57c03f9aa90@de.ibm.com> <1263e370-7cee-24d8-b98c-117bf7c90a83@de.ibm.com> Autocrypt: addr=borntraeger@de.ibm.com; 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Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.8.0 MIME-Version: 1.0 In-Reply-To: <1263e370-7cee-24d8-b98c-117bf7c90a83@de.ibm.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit X-TM-AS-GCONF: 00 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.216,18.0.687 definitions=2020-06-25_08:2020-06-25,2020-06-25 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 malwarescore=0 bulkscore=0 adultscore=0 phishscore=0 suspectscore=0 mlxscore=0 mlxlogscore=999 lowpriorityscore=0 impostorscore=0 spamscore=0 cotscore=-2147483648 clxscore=1015 priorityscore=1501 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2004280000 definitions=main-2006250080 Sender: owner-linux-security-module@vger.kernel.org Precedence: bulk List-ID: On 24.06.20 20:37, Christian Borntraeger wrote: > > > On 24.06.20 20:32, Christian Borntraeger wrote: > [...]> >> So the translations look correct. But your change is actually a sematic change >> if(ret) will only trigger if there is an error >> if (KWIFEXITED(ret)) will always trigger when the process ends. So we will always overwrite -ECHILD >> and we did not do it before. >> > > So the right fix is > > diff --git a/kernel/umh.c b/kernel/umh.c > index f81e8698e36e..a3a3196e84d1 100644 > --- a/kernel/umh.c > +++ b/kernel/umh.c > @@ -154,7 +154,7 @@ static void call_usermodehelper_exec_sync(struct subprocess_info *sub_info) > * the real error code is already in sub_info->retval or > * sub_info->retval is 0 anyway, so don't mess with it then. > */ > - if (KWIFEXITED(ret)) > + if (KWEXITSTATUS(ret)) > sub_info->retval = KWEXITSTATUS(ret); > } Ping. Shall I send this as a proper patch or are we merging this fixup in Andrews patch queue?