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 Received: from lists1p.gnu.org (lists1p.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 99D82C5CFC1 for ; Fri, 14 Aug 2026 17:18:38 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists1p.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1wuvXm-0003SU-7W; Fri, 14 Aug 2026 13:18:10 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists1p.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1wuvXj-0003Rf-Mk; Fri, 14 Aug 2026 13:18:07 -0400 Received: from mx0b-001b2d01.pphosted.com ([148.163.158.5]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1wuvXi-0005zQ-A3; Fri, 14 Aug 2026 13:18:07 -0400 Received: from pps.filterd (m0356516.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.18.1.11/8.18.1.11) with ESMTP id 67EH1dEd1626778; 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Fri, 14 Aug 2026 17:18:03 GMT Received: from smtprelay06.wdc07v.mail.ibm.com ([172.16.1.73]) by ppma11.dal12v.mail.ibm.com (PPS) with ESMTPS id 4g1rpvaxjp-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Fri, 14 Aug 2026 17:18:03 +0000 (GMT) Received: from smtpav03.dal12v.mail.ibm.com (smtpav03.dal12v.mail.ibm.com [10.241.53.102]) by smtprelay06.wdc07v.mail.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 67EHI14G4195028 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Fri, 14 Aug 2026 17:18:01 GMT Received: from smtpav03.dal12v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 72AC958056; Fri, 14 Aug 2026 17:18:01 +0000 (GMT) Received: from smtpav03.dal12v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 69CF65803F; Fri, 14 Aug 2026 17:18:00 +0000 (GMT) Received: from [9.61.136.224] (unknown [9.61.136.224]) by smtpav03.dal12v.mail.ibm.com (Postfix) with ESMTP; Fri, 14 Aug 2026 17:18:00 +0000 (GMT) Message-ID: Date: Fri, 14 Aug 2026 13:18:00 -0400 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] s390x/sclp: pv: only copy the original SCCB buffer To: Christian Borntraeger , Cornelia Huck Cc: qemu-devel , qemu-s390x , David Hildenbrand , Richard Henderson , Janosch Frank , Halil Pasic , Jason Herne , Ilya Leoshkevich , Matthew Rosato , Christian Borntraeger References: <20260814125857.1729543-1-borntraeger@de.ibm.com> Content-Language: en-US From: Eric Farman Autocrypt: addr=farman@linux.ibm.com; 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envelope-from=farman@linux.ibm.com; helo=mx0b-001b2d01.pphosted.com X-Spam_score_int: -26 X-Spam_score: -2.7 X-Spam_bar: -- X-Spam_report: (-2.7 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H3=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: qemu development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org On 8/14/26 8:58 AM, Christian Borntraeger wrote: > From: Christian Borntraeger > > With variable length and EXTENDED_LENGTH_SCCB, some callbacks might > change the length field. For example read SCP info might write a new > length into the SCCB header. We must not use that new length for the > buffer copy, since the buffer was allocated with the original length. > Only the length field in the work SCCB is changed, to indicate the > "necessary" size. Using the new length reads past the allocation, so > tools like ASAN might detect a buffer overrun. > > Secure guests do not have EXTENDED_LENGTH_SCCB, and the ultravisor checks > and sanitizes the length field, so no qemu heap contents are exposed to > the guest and the non pv-path already has the same header.length. > > Fixes: 0f73c5b30b8b ("s390x: protvirt: SCLP interpretation") > Signed-off-by: Christian Borntraeger > --- > hw/s390x/sclp.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) Reviewed-by: Eric Farman