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Wed, 23 Dec 2020 01:17:55 +0000 (GMT) Received: from b03ledav005.gho.boulder.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 8397BBE051; Wed, 23 Dec 2020 01:17:46 +0000 (GMT) Received: from manicouagan.localdomain (unknown [9.80.219.136]) by b03ledav005.gho.boulder.ibm.com (Postfix) with ESMTPS; Wed, 23 Dec 2020 01:17:46 +0000 (GMT) References: <20201219175713.18888-1-nramas@linux.microsoft.com> <20201219175713.18888-7-nramas@linux.microsoft.com> User-agent: mu4e 1.4.10; emacs 27.1 From: Thiago Jung Bauermann To: Lakshmi Ramasubramanian Cc: zohar@linux.ibm.com, robh@kernel.org, takahiro.akashi@linaro.org, gregkh@linuxfoundation.org, will@kernel.org, catalin.marinas@arm.com, mpe@ellerman.id.au, james.morse@arm.com, sashal@kernel.org, benh@kernel.crashing.org, paulus@samba.org, frowand.list@gmail.com, vincenzo.frascino@arm.com, mark.rutland@arm.com, dmitry.kasatkin@gmail.com, jmorris@namei.org, serge@hallyn.com, pasha.tatashin@soleen.com, allison@lohutok.net, masahiroy@kernel.org, bhsharma@redhat.com, mbrugger@suse.com, hsinyi@chromium.org, tao.li@vivo.com, christophe.leroy@c-s.fr, prsriva@linux.microsoft.com, balajib@linux.microsoft.com, linux-integrity@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, devicetree@vger.kernel.org Subject: Re: [PATCH v13 6/6] arm64: Add IMA log information in kimage used for kexec In-reply-to: <20201219175713.18888-7-nramas@linux.microsoft.com> Date: Tue, 22 Dec 2020 22:17:44 -0300 Message-ID: <87sg7xjp6v.fsf@manicouagan.localdomain> MIME-Version: 1.0 Content-Type: text/plain X-TM-AS-GCONF: 00 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.343,18.0.737 definitions=2020-12-22_13:2020-12-21,2020-12-22 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 adultscore=0 mlxscore=0 priorityscore=1501 phishscore=0 malwarescore=0 bulkscore=0 clxscore=1015 lowpriorityscore=0 mlxlogscore=999 spamscore=0 suspectscore=0 impostorscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2009150000 definitions=main-2012230003 Precedence: bulk List-ID: X-Mailing-List: linux-integrity@vger.kernel.org Lakshmi Ramasubramanian writes: > Address and size of the buffer containing the IMA measurement log need > to be passed from the current kernel to the next kernel on kexec. > > Any existing "linux,ima-kexec-buffer" property in the device tree > needs to be removed and its corresponding memory reservation in > the currently running kernel needs to be freed. The address and > size of the current kernel's IMA measurement log need to be added > to the device tree's IMA kexec buffer node and memory for the buffer > needs to be reserved for the log to be carried over to the next kernel > on the kexec call. > > Add address and size fields to "struct kimage_arch" for ARM64 platform > to hold the address and size of the IMA measurement log buffer. Remove > any existing "linux,ima-kexec-buffer" property in the device tree and > free the corresponding memory reservation in the currently running > kernel. Add "linux,ima-kexec-buffer" property to the device tree and > reserve the memory for storing the IMA log that needs to be passed from > the current kernel to the next one. > > Update CONFIG_KEXEC_FILE to select CONFIG_HAVE_IMA_KEXEC to indicate > that the IMA measurement log information is present in the device tree > for ARM64. > > Co-developed-by: Prakhar Srivastava > Signed-off-by: Prakhar Srivastava > Signed-off-by: Lakshmi Ramasubramanian > --- > arch/arm64/Kconfig | 1 + > arch/arm64/include/asm/kexec.h | 5 +++++ > 2 files changed, 6 insertions(+) > > diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig > index 1d466addb078..c85d18b1f2fd 100644 > --- a/arch/arm64/Kconfig > +++ b/arch/arm64/Kconfig > @@ -1094,6 +1094,7 @@ config KEXEC > config KEXEC_FILE > bool "kexec file based system call" > select KEXEC_CORE > + select HAVE_IMA_KEXEC > help > This is new version of kexec system call. This system call is > file based and takes file descriptors as system call argument As I suggested in the other email, this should be: select HAVE_IMA_KEXEC if IMA -- Thiago Jung Bauermann IBM Linux Technology Center