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From: Thiago Jung Bauermann <bauerman@linux.ibm.com>
To: Lakshmi Ramasubramanian <nramas@linux.microsoft.com>
Cc: zohar@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, 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 v10 7/8] powerpc: Move arch_ima_add_kexec_buffer to ima
Date: Sat, 05 Dec 2020 18:36:46 -0300	[thread overview]
Message-ID: <87k0twlytt.fsf@manicouagan.localdomain> (raw)
In-Reply-To: <20201204195149.611-8-nramas@linux.microsoft.com>


Lakshmi Ramasubramanian <nramas@linux.microsoft.com> writes:

> arch_ima_add_kexec_buffer() sets the address and size of the IMA
> measurement log in the architecture specific field in struct kimage.
> This function does not have architecture specific code, but is
> currently limited to powerpc.
>
> Move arch_ima_add_kexec_buffer() to
> security/integrity/ima/ima_kexec.c so that it is accessible for
> other architectures as well.
>
> Signed-off-by: Lakshmi Ramasubramanian <nramas@linux.microsoft.com>

Not sure if the maintainers will agree with me (see below), but FWIW:

Reviewed-by: Thiago Jung Bauermann <bauerman@linux.ibm.com>

> ---
>  arch/powerpc/include/asm/ima.h     |  3 ---
>  arch/powerpc/kexec/ima.c           | 21 ---------------------
>  security/integrity/ima/ima_kexec.c | 22 ++++++++++++++++++++++
>  3 files changed, 22 insertions(+), 24 deletions(-)
>
> diff --git a/arch/powerpc/include/asm/ima.h b/arch/powerpc/include/asm/ima.h
> index d8444d27f0d8..d6ab5d944dcd 100644
> --- a/arch/powerpc/include/asm/ima.h
> +++ b/arch/powerpc/include/asm/ima.h
> @@ -7,9 +7,6 @@
>  struct kimage;
>  
>  #ifdef CONFIG_IMA_KEXEC
> -int arch_ima_add_kexec_buffer(struct kimage *image, unsigned long load_addr,
> -			      size_t size);
> -
>  int setup_ima_buffer(const struct kimage *image, void *fdt, int chosen_node);
>  #else
>  static inline int setup_ima_buffer(const struct kimage *image, void *fdt,
> diff --git a/arch/powerpc/kexec/ima.c b/arch/powerpc/kexec/ima.c
> index bf7084c0c4da..b2793be353a9 100644
> --- a/arch/powerpc/kexec/ima.c
> +++ b/arch/powerpc/kexec/ima.c
> @@ -13,27 +13,6 @@
>  #include <linux/libfdt.h>
>  #include <asm/ima.h>
>  
> -/**
> - * arch_ima_add_kexec_buffer - do arch-specific steps to add the IMA buffer
> - *
> - * @image: kimage struct to set IMA buffer data
> - * @load_addr: Starting address where IMA buffer is loaded at
> - * @size: Number of bytes in the IMA buffer
> - *
> - * Architectures should use this function to pass on the IMA buffer
> - * information to the next kernel.
> - *
> - * Return: 0 on success, negative errno on error.
> - */
> -int arch_ima_add_kexec_buffer(struct kimage *image, unsigned long load_addr,
> -			      size_t size)
> -{
> -	image->arch.ima_buffer_addr = load_addr;
> -	image->arch.ima_buffer_size = size;
> -
> -	return 0;
> -}
> -
>  static int write_number(void *p, u64 value, int cells)
>  {
>  	if (cells == 1) {
> diff --git a/security/integrity/ima/ima_kexec.c b/security/integrity/ima/ima_kexec.c
> index 4d354593aecf..5263dafe8f4d 100644
> --- a/security/integrity/ima/ima_kexec.c
> +++ b/security/integrity/ima/ima_kexec.c
> @@ -74,6 +74,28 @@ static int ima_dump_measurement_list(unsigned long *buffer_size, void **buffer,
>  	return ret;
>  }
>  
> +/**
> + * arch_ima_add_kexec_buffer - do arch-specific steps to add the IMA buffer
> + *
> + * @image: kimage struct to set IMA buffer data
> + * @load_addr: Starting address where IMA buffer is loaded at
> + * @size: Number of bytes in the IMA buffer
> + *
> + * Architectures should use this function to pass on the IMA buffer
> + * information to the next kernel.
> + *
> + * Return: 0 on success, negative errno on error.
> + */
> +static int arch_ima_add_kexec_buffer(struct kimage *image,
> +				     unsigned long load_addr,
> +				     size_t size)
> +{
> +	image->arch.ima_buffer_addr = load_addr;
> +	image->arch.ima_buffer_size = size;
> +
> +	return 0;
> +}
> +

Both powerpc and arm64 use the definition above for
arch_ima_add_kexec_buffer(), so it makes sense to share them as you do
in this patch. This file isn't the best one to put arch-specific code
which happens to be identical among architectures, but I can't think of
somewhere else to put it.

For now this isn't an issue since powerpc and arm64 are the only arches
implementing tihs feature. If a third arch implemented it and also used
the same function definition as above, it wouldn't be an issue either so
perhaps this is good enough for the time being? :-)

With this patch, the `#include <asm/ima.h>` in
security/integrity/ima/ima.h can be removed. It was there just to
provide a declaration of arch_ima_add_kexec_buffer().

-- 
Thiago Jung Bauermann
IBM Linux Technology Center

  reply	other threads:[~2020-12-05 21:38 UTC|newest]

Thread overview: 29+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-12-04 19:51 [PATCH v10 0/8] Carry forward IMA measurement log on kexec on ARM64 Lakshmi Ramasubramanian
2020-12-04 19:51 ` [PATCH v10 1/8] powerpc: fix compiler warnings and errors Lakshmi Ramasubramanian
2020-12-05  1:20   ` Thiago Jung Bauermann
2020-12-04 19:51 ` [PATCH v10 2/8] powerpc: Move delete_fdt_mem_rsv() to drivers/of/kexec.c Lakshmi Ramasubramanian
2020-12-05  2:22   ` Thiago Jung Bauermann
2020-12-07  1:50     ` Lakshmi Ramasubramanian
2020-12-11 16:37       ` Lakshmi Ramasubramanian
2020-12-11 18:19         ` Thiago Jung Bauermann
2020-12-11 19:25           ` Lakshmi Ramasubramanian
2020-12-12  1:14             ` Thiago Jung Bauermann
2020-12-04 19:51 ` [PATCH v10 3/8] powerpc: Move ima buffer functions " Lakshmi Ramasubramanian
2020-12-05 19:48   ` Thiago Jung Bauermann
2020-12-07  1:53     ` Lakshmi Ramasubramanian
2020-12-04 19:51 ` [PATCH v10 4/8] powerpc: Use ima kexec node functions Lakshmi Ramasubramanian
2020-12-05 19:51   ` Thiago Jung Bauermann
2020-12-07  1:54     ` Lakshmi Ramasubramanian
2020-12-04 19:51 ` [PATCH v10 5/8] powerpc: Move remove_ima_buffer() to drivers/of/kexec.c Lakshmi Ramasubramanian
2020-12-05 20:14   ` Thiago Jung Bauermann
2020-12-07  1:57     ` Lakshmi Ramasubramanian
2020-12-04 19:51 ` [PATCH v10 6/8] powerpc: Move ima_get_kexec_buffer() and ima_free_kexec_buffer() to ima Lakshmi Ramasubramanian
2020-12-05 21:02   ` Thiago Jung Bauermann
2020-12-07  1:58     ` Lakshmi Ramasubramanian
2020-12-04 19:51 ` [PATCH v10 7/8] powerpc: Move arch_ima_add_kexec_buffer " Lakshmi Ramasubramanian
2020-12-05 21:36   ` Thiago Jung Bauermann [this message]
2020-12-07  2:03     ` Lakshmi Ramasubramanian
2020-12-07 14:57       ` Mimi Zohar
2020-12-04 19:51 ` [PATCH v10 8/8] arm64: Add IMA log information in kimage used for kexec Lakshmi Ramasubramanian
2020-12-05 21:44   ` Thiago Jung Bauermann
2020-12-07  2:05     ` Lakshmi Ramasubramanian

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