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Wed, 27 Jan 2021 18:02:34 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1611770560; bh=/DgxQRCaQ+bjOKRCBN5t16Filx/2Xbp2TwXvChsBqCQ=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=qSG9vSF3mDlNwCCULEl6l24OPcV44Jmusij7YRPP1IC5bdAh7ceBgqKWM0xuAOewn NVHyVRKDbbYRehmj2RGQ5BtIopm9rf+shq+6+R77lDYxwuKOvU7jYvtiQ8hjF4U4ro eTJIQw8PxFZr1SRr+dFs6CglAsDv7dSS9CflXFYv8CLnw/k809/kWy5K5L4Eg7g/Bh +PPnE3LazntbQjf9i14fz+0P48+8LWQ7Nv2FA/qvIDqt7Wd0pijK2k8F5M2R2f4GSi KsncqGDHnG1EZwHY1IkZUASFGR6P03jG3HIiV1CC9i3Z/VOy5WaFGFlnG1hKn4Zzxf w0WRGvIEhS7cQ== Date: Wed, 27 Jan 2021 18:02:30 +0000 From: Will Deacon To: Lakshmi Ramasubramanian Subject: Re: [PATCH v15 10/10] arm64: Add IMA log information in kimage used for kexec Message-ID: <20210127180230.GA593@willie-the-truck> References: <20210115173017.30617-1-nramas@linux.microsoft.com> <20210115173017.30617-11-nramas@linux.microsoft.com> <20210127165424.GB358@willie-the-truck> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.10.1 (2018-07-13) X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: mark.rutland@arm.com, bhsharma@redhat.com, tao.li@vivo.com, zohar@linux.ibm.com, paulus@samba.org, vincenzo.frascino@arm.com, frowand.list@gmail.com, sashal@kernel.org, robh@kernel.org, masahiroy@kernel.org, jmorris@namei.org, takahiro.akashi@linaro.org, linux-arm-kernel@lists.infradead.org, catalin.marinas@arm.com, serge@hallyn.com, devicetree@vger.kernel.org, pasha.tatashin@soleen.com, prsriva@linux.microsoft.com, hsinyi@chromium.org, allison@lohutok.net, christophe.leroy@c-s.fr, mbrugger@suse.com, balajib@linux.microsoft.com, dmitry.kasatkin@gmail.com, linux-kernel@vger.kernel.org, james.morse@arm.com, gregkh@linuxfoundation.org, linux-integrity@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, bauerman@linux.ibm.com Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" On Wed, Jan 27, 2021 at 09:56:53AM -0800, Lakshmi Ramasubramanian wrote: > On 1/27/21 8:54 AM, Will Deacon wrote: > > On Fri, Jan 15, 2021 at 09:30:17AM -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. > > > > > > Add address and size fields to "struct kimage_arch" for ARM64 platform > > > to hold the address and size of the IMA measurement log buffer. > > > > > > Update CONFIG_KEXEC_FILE to select CONFIG_HAVE_IMA_KEXEC, if CONFIG_IMA > > > is enabled, 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 > > > Reviewed-by: Thiago Jung Bauermann > > > --- > > > 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..ea7f7fe3dccd 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 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 > > > > Why do these need to be in the arch structure instead of 'struct kimage'? > > > > Currently, only powerpc and, with this patch set, arm64 have support for > carrying forward IMA measurement list across kexec system call. The above > fields are used for tracking IMA measurement list. > > Do you see a reason to move these fields to "struct kimage"? If they're gated on CONFIG_IMA_KEXEC, then it seems harmless for them to be added to the shared structure. Or are you saying that there are architectures which have CONFIG_IMA_KEXEC but do not want these fields? Will