From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mx0a-001b2d01.pphosted.com (mx0a-001b2d01.pphosted.com [148.163.156.1]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 2F7A41757F for ; Fri, 12 Jan 2024 17:45:52 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.ibm.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.ibm.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=ibm.com header.i=@ibm.com header.b="o3VCscoE" Received: from pps.filterd (m0353728.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.17.1.19/8.17.1.19) with ESMTP id 40CH7e7i030685; Fri, 12 Jan 2024 17:44:29 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ibm.com; h=message-id : subject : from : to : cc : date : in-reply-to : references : content-type : mime-version : content-transfer-encoding; s=pp1; bh=l145NYIvG8B5+ZD6CdXEuBjP+4XhXGuLSwNVRWXAn/U=; b=o3VCscoEe/gHHZIbG0RegUkKgPRNha3eIbaU1pN32CUPu2jOTbMzcBbUUH9M1qSGkLaO 4nUCnbBUsZMfIYdpWlX9+kAqWDydZc1QTCs44Y2Wak7vw707gw+QsXkupc6dg5Kyuhf/ u4XP+XjgQlTI7up+rC/OKRPETTNBlWXTeYMONeEviLh3GrUZmJL272tzh7cE82RCQ3dI birfv7MqaEMmcICrBtsfeAiYeTxelhcev4UXtpRFq110Yw9B4yAQ1SsyebdJy1iXhTAF 4HZOVOCF27slbFsJQLLIstSCA4oV8DQoGQ+5FSIVc8ZN3jmcUsadqg1RuBYdx1rhi8CC CA== Received: from ppma23.wdc07v.mail.ibm.com (5d.69.3da9.ip4.static.sl-reverse.com [169.61.105.93]) by mx0a-001b2d01.pphosted.com (PPS) with ESMTPS id 3vk9hx8x7m-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Fri, 12 Jan 2024 17:44:29 +0000 Received: from pps.filterd (ppma23.wdc07v.mail.ibm.com [127.0.0.1]) by ppma23.wdc07v.mail.ibm.com (8.17.1.19/8.17.1.19) with ESMTP id 40CH0FSJ004427; Fri, 12 Jan 2024 17:44:27 GMT Received: from smtprelay01.wdc07v.mail.ibm.com ([172.16.1.68]) by ppma23.wdc07v.mail.ibm.com (PPS) with ESMTPS id 3vfjpmbbch-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Fri, 12 Jan 2024 17:44:27 +0000 Received: from smtpav02.dal12v.mail.ibm.com (smtpav02.dal12v.mail.ibm.com [10.241.53.101]) by smtprelay01.wdc07v.mail.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 40CHiRHj45941230 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Fri, 12 Jan 2024 17:44:27 GMT Received: from smtpav02.dal12v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 12C255805F; Fri, 12 Jan 2024 17:44:27 +0000 (GMT) Received: from smtpav02.dal12v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 5E32F58051; Fri, 12 Jan 2024 17:44:26 +0000 (GMT) Received: from li-f45666cc-3089-11b2-a85c-c57d1a57929f.ibm.com (unknown [9.61.149.108]) by smtpav02.dal12v.mail.ibm.com (Postfix) with ESMTP; Fri, 12 Jan 2024 17:44:26 +0000 (GMT) Message-ID: <6acf82dcefd349941b05ff2a3b7e4bf651dc4429.camel@linux.ibm.com> Subject: Re: [PATCH v3 6/7] ima: configure memory to log events between kexec load and execute From: Mimi Zohar To: Tushar Sugandhi , Stefan Berger , roberto.sassu@huaweicloud.com, roberto.sassu@huawei.com, eric.snowberg@oracle.com, ebiederm@xmission.com, noodles@fb.com, bauermann@kolabnow.com, linux-integrity@vger.kernel.org, kexec@lists.infradead.org Cc: code@tyhicks.com, nramas@linux.microsoft.com, paul@paul-moore.com Date: Fri, 12 Jan 2024 12:44:25 -0500 In-Reply-To: References: <20231216010729.2904751-1-tusharsu@linux.microsoft.com> <20231216010729.2904751-7-tusharsu@linux.microsoft.com> <3e8cb0bd77a2b73613b19febb2b3121ef0ea8255.camel@linux.ibm.com> <0df62e0e-a9d5-434c-866c-936cafeed480@linux.microsoft.com> Content-Type: text/plain; charset="UTF-8" X-Mailer: Evolution 3.28.5 (3.28.5-22.el8) Precedence: bulk X-Mailing-List: linux-integrity@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 Content-Transfer-Encoding: 7bit X-TM-AS-GCONF: 00 X-Proofpoint-GUID: yHuFKTJkjM8GtMyYopA2FCfK3mjXf6j0 X-Proofpoint-ORIG-GUID: yHuFKTJkjM8GtMyYopA2FCfK3mjXf6j0 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.272,Aquarius:18.0.997,Hydra:6.0.619,FMLib:17.11.176.26 definitions=2024-01-12_08,2024-01-12_01,2023-05-22_02 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 bulkscore=0 impostorscore=0 lowpriorityscore=0 spamscore=0 adultscore=0 phishscore=0 mlxscore=0 clxscore=1015 suspectscore=0 malwarescore=0 mlxlogscore=999 priorityscore=1501 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2311290000 definitions=main-2401120140 On Thu, 2024-01-11 at 12:52 -0800, Tushar Sugandhi wrote: [...] > If we go with the KBs approach - > > half-a-page translates to different KBs on different architectures. > And setting the right default value in KBs which would translate to > the desired half-a-page, on a given arch, inside the Kconfig seems > fragile (as I mentioned in the context of Option A in my previous > response. How about setting the default value to 0, indicating not to change the current half page default. Any other value would be KBs, as Stefan suggested. -- thanks, Mimi