From: Mimi Zohar <zohar@linux.ibm.com>
To: Lakshmi Ramasubramanian <nramas@linux.microsoft.com>,
bauerman@linux.ibm.com, robh@kernel.org,
gregkh@linuxfoundation.org, james.morse@arm.com,
catalin.marinas@arm.com, sashal@kernel.org, will@kernel.org,
mpe@ellerman.id.au, benh@kernel.crashing.org, paulus@samba.org,
robh+dt@kernel.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,
kstewart@linuxfoundation.org, takahiro.akashi@linaro.org,
tglx@linutronix.de, masahiroy@kernel.org, bhsharma@redhat.com,
mbrugger@suse.com, hsinyi@chromium.org, tao.li@vivo.com,
christophe.leroy@c-s.fr
Cc: linux-integrity@vger.kernel.org, linux-kernel@vger.kernel.org,
devicetree@vger.kernel.org, prsriva@linux.microsoft.com,
balajib@linux.microsoft.com
Subject: Re: [PATCH v7 1/4] powerpc: Refactor kexec functions to move arch independent code to kernel
Date: Tue, 20 Oct 2020 16:00:34 -0400 [thread overview]
Message-ID: <bfaadaffafa3b8c12fce7e8491ea77e22a5821a8.camel@linux.ibm.com> (raw)
In-Reply-To: <20200930205941.1576-2-nramas@linux.microsoft.com>
Hi Lakshmi,
On Wed, 2020-09-30 at 13:59 -0700, Lakshmi Ramasubramanian wrote:
> The functions remove_ima_buffer() and delete_fdt_mem_rsv() that handle
> carrying forward the IMA measurement logs on kexec for powerpc do not
> have architecture specific code, but they are currently defined for
> powerpc only.
>
> remove_ima_buffer() and delete_fdt_mem_rsv() are used to remove
> the IMA log entry from the device tree and free the memory reserved
> for the log. These functions need to be defined even if the current
> kernel does not support carrying forward IMA log across kexec since
> the previous kernel could have supported that and therefore the current
> kernel needs to free the allocation.
>
> Rename remove_ima_buffer() to remove_ima_kexec_buffer().
> Define remove_ima_kexec_buffer() and delete_fdt_mem_rsv() in kernel.
> A later patch in this series will use these functions to free
> the allocation, if any, made by the previous kernel for ARM64.
>
> Define FDT_PROP_IMA_KEXEC_BUFFER for the chosen node, namely
> "linux,ima-kexec-buffer", that is added to the DTB to hold
> the address and the size of the memory reserved to carry
> the IMA measurement log.
> Co-developed-by: Prakhar Srivastava <prsriva@linux.microsoft.com>
> Signed-off-by: Prakhar Srivastava <prsriva@linux.microsoft.com>
> Signed-off-by: Lakshmi Ramasubramanian <nramas@linux.microsoft.com>
> Reported-by: kernel test robot <lkp@intel.com> error: implicit declaration of function 'delete_fdt_mem_rsv' [-Werror,-Wimplicit-function-declaration]
Much better! This version limits unnecessarily changing the existing
code to adding a couple of debugging statements, but that looks to be
about it.
Based on Chester Lin's "ima_arch" support for arm64 discussion, the IMA generic
EFI support will be defined in ima/ima-efi.c. Similarly, I think it would make sense to put the generic device tree support in ima/ima_kexec_fdt.c or ima/ima_fdt.c, as opposed to kernel/. (Refer to my comments on 2/4 about the new file named ima_kexec_fdt.c.)
thanks,
Mimi
next prev parent reply other threads:[~2020-10-20 20:01 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-09-30 20:59 [PATCH v7 0/3] Carry forward IMA measurement log on kexec on ARM64 Lakshmi Ramasubramanian
2020-09-30 20:59 ` [PATCH v7 1/4] powerpc: Refactor kexec functions to move arch independent code to kernel Lakshmi Ramasubramanian
2020-10-20 20:00 ` Mimi Zohar [this message]
2020-10-21 2:25 ` Lakshmi Ramasubramanian
2020-10-21 3:17 ` Mimi Zohar
2020-10-21 16:58 ` Lakshmi Ramasubramanian
2020-10-23 3:46 ` Thiago Jung Bauermann
2020-10-26 18:36 ` Lakshmi Ramasubramanian
2020-09-30 20:59 ` [PATCH v7 2/4] powerpc: Refactor kexec functions to move arch independent code to ima Lakshmi Ramasubramanian
2020-10-20 20:01 ` Mimi Zohar
2020-10-21 2:38 ` Lakshmi Ramasubramanian
2020-10-21 3:50 ` Mimi Zohar
2020-10-21 16:20 ` Lakshmi Ramasubramanian
2020-09-30 20:59 ` [PATCH v7 3/4] arm64: Store IMA log information in kimage used for kexec Lakshmi Ramasubramanian
2020-09-30 20:59 ` [PATCH v7 4/4] arm64: Add IMA kexec buffer to DTB Lakshmi Ramasubramanian
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