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Date: Tue, 12 Jan 2021 18:28:30 -0500 From: Mimi Zohar <zohar@...ux.ibm.com> To: Lakshmi Ramasubramanian <nramas@...ux.microsoft.com>, bauerman@...ux.ibm.com, robh@...nel.org, takahiro.akashi@...aro.org, gregkh@...uxfoundation.org, will@...nel.org, catalin.marinas@....com, mpe@...erman.id.au Cc: james.morse@....com, sashal@...nel.org, benh@...nel.crashing.org, paulus@...ba.org, frowand.list@...il.com, vincenzo.frascino@....com, mark.rutland@....com, dmitry.kasatkin@...il.com, jmorris@...ei.org, serge@...lyn.com, pasha.tatashin@...een.com, allison@...utok.net, masahiroy@...nel.org, bhsharma@...hat.com, mbrugger@...e.com, hsinyi@...omium.org, tao.li@...o.com, christophe.leroy@....fr, prsriva@...ux.microsoft.com, balajib@...ux.microsoft.com, linux-integrity@...r.kernel.org, linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org, linuxppc-dev@...r.kernel.org Subject: Re: [PATCH v14 6/6] arm64: Add IMA log information in kimage used for kexec Hi Lakshmi, On Mon, 2021-01-04 at 11:26 -0800, Lakshmi Ramasubramanian wrote: > 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. Perhaps for some previous version of this patch set, this patch description was appropriate, but for the code below it's kind of overkill. Mimi > > Co-developed-by: Prakhar Srivastava <prsriva@...ux.microsoft.com> > Signed-off-by: Prakhar Srivastava <prsriva@...ux.microsoft.com> > Signed-off-by: Lakshmi Ramasubramanian <nramas@...ux.microsoft.com> > --- > 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 a6b5b7ef40ae..312b4d5ad232 100644 > --- a/arch/arm64/Kconfig > +++ b/arch/arm64/Kconfig > @@ -1095,6 +1095,7 @@ config KEXEC > config KEXEC_FILE > bool "kexec file based system call" > select KEXEC_CORE > + select HAVE_IMA_KEXEC if IMA > help > This is new version of kexec system call. This system call is > file based and takes file descriptors as system call argument > diff --git a/arch/arm64/include/asm/kexec.h b/arch/arm64/include/asm/kexec.h > index d24b527e8c00..2bd19ccb6c43 100644 > --- a/arch/arm64/include/asm/kexec.h > +++ b/arch/arm64/include/asm/kexec.h > @@ -100,6 +100,11 @@ struct kimage_arch { > void *elf_headers; > unsigned long elf_headers_mem; > unsigned long elf_headers_sz; > + > +#ifdef CONFIG_IMA_KEXEC > + phys_addr_t ima_buffer_addr; > + size_t ima_buffer_size; > +#endif > }; > > extern const struct kexec_file_ops kexec_image_ops;
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