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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 6/8] powerpc: Move ima_get_kexec_buffer() and ima_free_kexec_buffer() to ima
Date: Sat, 05 Dec 2020 18:02:07 -0300	[thread overview]
Message-ID: <87mtysm0fk.fsf@manicouagan.localdomain> (raw)
In-Reply-To: <20201204195149.611-7-nramas@linux.microsoft.com>


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

> ima_get_kexec_buffer() retrieves the address and size of the buffer
> used for carrying forward the IMA measurement logs on kexec from
> the device tree.
>
> ima_free_kexec_buffer() removes the chosen node
> "linux,ima-kexec-buffer" from the device tree, and frees the buffer
> used for carrying forward the IMA measurement logs on kexec.
>
> These functions do not have architecture specific code, but are
> currently limited to powerpc. Move ima_get_kexec_buffer() and
> ima_free_kexec_buffer() to ima_kexec.c in IMA so that they are
> accessible for other architectures as well.
>
> With the above change the functions in arch/powerpc/kexec/ima.c are
> defined only when the kernel config CONFIG_IMA_KEXEC is enabled.
> Update the Makefile to build arch/powerpc/kexec/ima.c only when
> CONFIG_IMA_KEXEC is enabled and remove "#ifdef CONFIG_IMA_KEXEC"
> in arch/powerpc/kexec/ima.c.

Nice.

> 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>
> Reviewed-by: Mimi Zohar <zohar@linux.ibm.com>

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

Just a small nit below:

> ---
>  arch/powerpc/include/asm/ima.h     |  3 --
>  arch/powerpc/kexec/Makefile        |  7 +---
>  arch/powerpc/kexec/ima.c           | 50 -----------------------------
>  security/integrity/ima/ima_kexec.c | 51 ++++++++++++++++++++++++++++++
>  4 files changed, 52 insertions(+), 59 deletions(-)
>
> diff --git a/arch/powerpc/include/asm/ima.h b/arch/powerpc/include/asm/ima.h
> index a2fc71bc3b23..d8444d27f0d8 100644
> --- a/arch/powerpc/include/asm/ima.h
> +++ b/arch/powerpc/include/asm/ima.h
> @@ -6,9 +6,6 @@
>  
>  struct kimage;
>  
> -int ima_get_kexec_buffer(void **addr, size_t *size);
> -int ima_free_kexec_buffer(void);
> -
>  #ifdef CONFIG_IMA_KEXEC
>  int arch_ima_add_kexec_buffer(struct kimage *image, unsigned long load_addr,
>  			      size_t size);
> diff --git a/arch/powerpc/kexec/Makefile b/arch/powerpc/kexec/Makefile
> index 4aff6846c772..f54a9dbff4c8 100644
> --- a/arch/powerpc/kexec/Makefile
> +++ b/arch/powerpc/kexec/Makefile
> @@ -9,12 +9,7 @@ obj-$(CONFIG_PPC32)		+= relocate_32.o
>  
>  obj-$(CONFIG_KEXEC_FILE)	+= file_load.o ranges.o file_load_$(BITS).o elf_$(BITS).o
>  
> -ifdef CONFIG_HAVE_IMA_KEXEC
> -ifdef CONFIG_IMA
> -obj-y				+= ima.o
> -endif
> -endif
> -
> +obj-$(CONFIG_IMA_KEXEC)		+= ima.o
>  
>  # Disable GCOV, KCOV & sanitizers in odd or sensitive code
>  GCOV_PROFILE_core_$(BITS).o := n
> diff --git a/arch/powerpc/kexec/ima.c b/arch/powerpc/kexec/ima.c
> index 68017123b07d..bf7084c0c4da 100644
> --- a/arch/powerpc/kexec/ima.c
> +++ b/arch/powerpc/kexec/ima.c
> @@ -13,55 +13,6 @@
>  #include <linux/libfdt.h>
>  #include <asm/ima.h>

With this patch, the following includes become unnecessary and can be
removed from this file:

#include <linux/of.h>
#include <linux/memblock.h>

> -/**
> - * ima_get_kexec_buffer - get IMA buffer from the previous kernel
> - * @addr:	On successful return, set to point to the buffer contents.
> - * @size:	On successful return, set to the buffer size.
> - *
> - * Return: 0 on success, negative errno on error.
> - */
> -int ima_get_kexec_buffer(void **addr, size_t *size)
> -{
> -	int ret;
> -	unsigned long tmp_addr;
> -	size_t tmp_size;
> -
> -	ret = get_ima_kexec_buffer(NULL, 0, &tmp_addr, &tmp_size);
> -	if (ret)
> -		return ret;
> -
> -	*addr = __va(tmp_addr);
> -	*size = tmp_size;
> -
> -	return 0;
> -}
> -
> -/**
> - * ima_free_kexec_buffer - free memory used by the IMA buffer
> - */
> -int ima_free_kexec_buffer(void)
> -{
> -	int ret;
> -	unsigned long addr;
> -	size_t size;
> -	struct property *prop;
> -
> -	prop = of_find_property(of_chosen, "linux,ima-kexec-buffer", NULL);
> -	if (!prop)
> -		return -ENOENT;
> -
> -	ret = get_ima_kexec_buffer(NULL, 0, &addr, &size);
> -	if (ret)
> -		return ret;
> -
> -	ret = of_remove_property(of_chosen, prop);
> -	if (ret)
> -		return ret;
> -
> -	return memblock_free(addr, size);
> -}
> -
> -#ifdef CONFIG_IMA_KEXEC
>  /**
>   * arch_ima_add_kexec_buffer - do arch-specific steps to add the IMA buffer
>   *
> @@ -154,4 +105,3 @@ int setup_ima_buffer(const struct kimage *image, void *fdt, int chosen_node)
>  
>  	return 0;
>  }
> -#endif /* CONFIG_IMA_KEXEC */

-- 
Thiago Jung Bauermann
IBM Linux Technology Center

  reply	other threads:[~2020-12-05 21:03 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 [this message]
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
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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