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=-3.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,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 0D341C432BE for ; Fri, 30 Jul 2021 09:51:50 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id F1E4660230 for ; Fri, 30 Jul 2021 09:51:49 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S238297AbhG3Jvw (ORCPT ); Fri, 30 Jul 2021 05:51:52 -0400 Received: from mx0b-001b2d01.pphosted.com ([148.163.158.5]:21702 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S238223AbhG3Jvv (ORCPT ); Fri, 30 Jul 2021 05:51:51 -0400 Received: from pps.filterd (m0098416.ppops.net [127.0.0.1]) by mx0b-001b2d01.pphosted.com (8.16.0.43/8.16.0.43) with SMTP id 16U9Wma0032673; Fri, 30 Jul 2021 05:49:24 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ibm.com; h=date : from : to : cc : subject : message-id : references : mime-version : content-type : in-reply-to; s=pp1; bh=RYVrVB0Cv2/R3lfmKnDGtLWGBHS277MIQR61B43z3uM=; b=dGwRHMW+dV44draTp+TTntVOVZQoJjo0X1i/5LdgoAcqjM8JLU7lkDxlZoaKCMUKaNvy M+ZjKdhpw34/vrKYLtUjIcBj6RIwv6+gThIzOeXw63W5RhwZ8jEpeJ8lUJRSg2zz7PKT zOASTY1gTLrCWIjcz6bYSEGewtcDHLwf8Fzcaot81sFOXT7yz2HvFqBZo3EV+0ejZ807 GKQxJOKRmMFhInRW8OmWGMh92ydIzQl4xBQTCE6PhqZ4pcTf9HFmQHnHKz/7RK4PlcBW De6pJGr9HrSc0qCw+yczs0r3u8j6/ghV1t4+xXF8c6L5aVgh19eC+7GvSO/OXLM2ZsPF Kw== Received: from pps.reinject (localhost [127.0.0.1]) by mx0b-001b2d01.pphosted.com with ESMTP id 3a4e9j1cme-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Fri, 30 Jul 2021 05:49:24 -0400 Received: from m0098416.ppops.net (m0098416.ppops.net [127.0.0.1]) by pps.reinject (8.16.0.43/8.16.0.43) with SMTP id 16U9WmsP032691; Fri, 30 Jul 2021 05:49:23 -0400 Received: from ppma06fra.de.ibm.com (48.49.7a9f.ip4.static.sl-reverse.com [159.122.73.72]) by mx0b-001b2d01.pphosted.com with ESMTP id 3a4e9j1ckr-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Fri, 30 Jul 2021 05:49:23 -0400 Received: from pps.filterd (ppma06fra.de.ibm.com [127.0.0.1]) by ppma06fra.de.ibm.com (8.16.1.2/8.16.1.2) with SMTP id 16U9lRKT013772; Fri, 30 Jul 2021 09:49:21 GMT Received: from b06avi18626390.portsmouth.uk.ibm.com (b06avi18626390.portsmouth.uk.ibm.com [9.149.26.192]) by ppma06fra.de.ibm.com with ESMTP id 3a235kjwrx-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Fri, 30 Jul 2021 09:49:21 +0000 Received: from d06av24.portsmouth.uk.ibm.com (mk.ibm.com [9.149.105.60]) by b06avi18626390.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 16U9kYNh23789872 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Fri, 30 Jul 2021 09:46:34 GMT Received: from d06av24.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id ABB9742052; Fri, 30 Jul 2021 09:49:17 +0000 (GMT) Received: from d06av24.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 77B664203F; Fri, 30 Jul 2021 09:49:16 +0000 (GMT) Received: from osiris (unknown [9.145.161.212]) by d06av24.portsmouth.uk.ibm.com (Postfix) with ESMTPS; Fri, 30 Jul 2021 09:49:16 +0000 (GMT) Date: Fri, 30 Jul 2021 11:49:15 +0200 From: Heiko Carstens To: Arnd Bergmann Cc: Andrew Morton , Arnd Bergmann , Catalin Marinas , Will Deacon , Thomas Bogendoerfer , "James E.J. Bottomley" , Helge Deller , Michael Ellerman , Benjamin Herrenschmidt , Paul Mackerras , Vasily Gorbik , Christian Borntraeger , "David S. Miller" , Thomas Gleixner , Ingo Molnar , Borislav Petkov , x86@kernel.org, "H. Peter Anvin" , Al Viro , "Eric W. Biederman" , Christoph Hellwig , Feng Tang , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-mips@vger.kernel.org, linux-parisc@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-s390@vger.kernel.org, sparclinux@vger.kernel.org, linux-arch@vger.kernel.org, linux-api@vger.kernel.org, linux-mm@kvack.org Subject: Re: [PATCH v5 0/6] compat: remove compat_alloc_user_space Message-ID: References: <20210727144859.4150043-1-arnd@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20210727144859.4150043-1-arnd@kernel.org> X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: zR7p1uPVJVzE85QHjW8aYnuNusoUj_ko X-Proofpoint-GUID: cr8jFOyeRsqaNkR-GlUmXQX1PdWeweCa X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.391,18.0.790 definitions=2021-07-30_05:2021-07-29,2021-07-30 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 malwarescore=0 mlxlogscore=697 impostorscore=0 suspectscore=0 adultscore=0 spamscore=0 priorityscore=1501 mlxscore=0 clxscore=1015 phishscore=0 bulkscore=0 lowpriorityscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2107140000 definitions=main-2107300057 Precedence: bulk List-ID: X-Mailing-List: linux-mips@vger.kernel.org On Tue, Jul 27, 2021 at 04:48:53PM +0200, Arnd Bergmann wrote: > From: Arnd Bergmann > > Going through compat_alloc_user_space() to convert indirect system call > arguments tends to add complexity compared to handling the native and > compat logic in the same code. > > Out of the other remaining callers, the linux-media series went into > v5.14, and the network ioctl handling is now fixed in net-next, so > these are the last remaining users, and I now include the final > patch to remove the definitions as well. > > Since these patches are now all that remains, it would be nice to > merge it all through Andrew's Linux-mm tree, which is already based > on top of linux-next. ... > > Arnd Bergmann (6): > kexec: move locking into do_kexec_load > kexec: avoid compat_alloc_user_space > mm: simplify compat_sys_move_pages > mm: simplify compat numa syscalls > compat: remove some compat entry points > arch: remove compat_alloc_user_space Our CI reports this with linux-next and running strace selftest in compat mode: Unable to handle kernel pointer dereference in virtual kernel address space Failing address: 0000038003e7c000 TEID: 0000038003e7c803 Fault in home space mode while using kernel ASCE. AS:00000001fb388007 R3:000000008021c007 S:0000000082142000 P:0000000000000400 Oops: 0011 ilc:3 [#1] SMP CPU: 0 PID: 1017495 Comm: get_mempolicy Tainted: G OE 5.14.0-20210730.rc3.git0.4ccc9e2db7ac.300.fc34.s390x+next #1 Hardware name: IBM 2827 H66 708 (LPAR) Krnl PSW : 0704e00180000000 00000001f9f11000 (compat_put_bitmap+0x48/0xd0) R:0 T:1 IO:1 EX:1 Key:0 M:1 W:0 P:0 AS:3 CC:2 PM:0 RI:0 EA:3 Krnl GPRS: 0000000000810000 0000000000000000 000000007d9df1c0 0000038003e7c008 0000000000000004 000000007d9df1c4 0000038003e7be40 0000000000010000 0000000000008000 0000000000000000 0000000000000390 00000000000001c8 000000020d6ea000 000002aa00401a48 00000001fa0a85fa 0000038003e7bd50 Krnl Code: 00000001f9f10ff4: a7bb0001 aghi %r11,1 00000001f9f10ff8: 41303008 la %r3,8(%r3) #00000001f9f10ffc: 41502004 la %r5,4(%r2) >00000001f9f11000: e3103ff8ff04 lg %r1,-8(%r3) 00000001f9f11006: 5010f0a4 st %r1,164(%r15) 00000001f9f1100a: a50e0081 llilh %r0,129 00000001f9f1100e: c8402000f0a4 mvcos 0(%r2),164(%r15),%r4 00000001f9f11014: 1799 xr %r9,%r9 Call Trace: [<00000001f9f11000>] compat_put_bitmap+0x48/0xd0 [<00000001fa0a85fa>] kernel_get_mempolicy+0x102/0x178 [<00000001fa0a86b0>] __s390_sys_get_mempolicy+0x40/0x50 [<00000001fa92be30>] __do_syscall+0x1c0/0x1e8 [<00000001fa939148>] system_call+0x78/0xa0 Last Breaking-Event-Address: [<0000038003e7bc00>] 0x38003e7bc00 Kernel panic - not syncing: Fatal exception: panic_on_oops Note: I did not try to bisect this, since it looks to me like this patch series causes the problem. Also, please don't get confused with the kernel version name. The date encoded is the build date, not the linux-next version. linux-next commit 4ccc9e2db7ac ("Add linux-next specific files for 20210729") was used to build the kernel (s390 defconfig).