linux-kernel - Re: [PATCH 11/18] Hibernate: introduced RSA key-pair to verify signature of snapshot

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Message-ID: <20130825162554.GH5171@amd.pavel.ucw.cz>
Date:	Sun, 25 Aug 2013 18:25:54 +0200
From:	Pavel Machek <pavel@....cz>
To:	"Lee, Chun-Yi" <joeyli.kernel@...il.com>
Cc:	linux-kernel@...r.kernel.org,
	linux-security-module@...r.kernel.org, linux-efi@...r.kernel.org,
	linux-pm@...r.kernel.org, linux-crypto@...r.kernel.org,
	opensuse-kernel@...nsuse.org, David Howells <dhowells@...hat.com>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Matthew Garrett <mjg59@...f.ucam.org>,
	Len Brown <len.brown@...el.com>,
	Josh Boyer <jwboyer@...hat.com>,
	Vojtech Pavlik <vojtech@...e.cz>,
	Matt Fleming <matt.fleming@...el.com>,
	James Bottomley <james.bottomley@...senpartnership.com>,
	Greg KH <gregkh@...uxfoundation.org>, JKosina@...e.com,
	Rusty Russell <rusty@...tcorp.com.au>,
	Herbert Xu <herbert@...dor.apana.org.au>,
	"David S. Miller" <davem@...emloft.net>,
	"H. Peter Anvin" <hpa@...or.com>, Michal Marek <mmarek@...e.cz>,
	Gary Lin <GLin@...e.com>, Vivek Goyal <vgoyal@...hat.com>,
	"Lee, Chun-Yi" <jlee@...e.com>, Takashi Iwai <tiwai@...e.de>
Subject: Re: [PATCH 11/18] Hibernate: introduced RSA key-pair to verify
 signature of snapshot

On Thu 2013-08-22 19:01:50, Lee, Chun-Yi wrote:
> Introduced a hibernate_key.c file to query the key pair from EFI variables
> and maintain key pair for check signature of S4 snapshot image. We
> loaded the private key when snapshot image stored success.
> 
> This patch introduced 2 EFI variables for store the key to sign S4 image and
> verify signature when S4 wake up. The names and GUID are:
>   S4SignKey-fe141863-c070-478e-b8a3-878a5dc9ef21
>   S4WakeKey-fe141863-c070-478e-b8a3-878a5dc9ef21
> 
> S4SignKey is used by EFI bootloader to pass the RSA private key that packaged
> by PKCS#8 format, kernel will read and parser it when system boot and reload
> it when S4 resume. EFI bootloader need gnerate a new private key when every
> time system boot.
> 
> S4WakeKey is used to pass the RSA public key that packaged by X.509
> certificate, kernel will read and parser it for check the signature of
> S4 snapshot image when S4 resume.
> 
> The follow-up patch will remove S4SignKey and S4WakeKey after load them
> to kernel for avoid anyone can access it through efivarfs.
> 
> v3:
> - Load S4 sign key before ExitBootServices.
>   Load private key before ExitBootServices() then bootloader doesn't need
>   generate key-pair for each booting:
>    + Add setup_s4_keys() to eboot.c to load S4 sign key before ExitBootServices.
>    + Reserve the memory block of sign key data blob in efi.c
> - In Makefile, moved hibernate_keys.o before hibernate.o for load S4 sign
>   key before check hibernate image. It makes sure the new sign key will be
>   transfer to resume target kernel.
> - Set "depends on EFI_STUB" in Kconfig
> 
> v2:
> Add CONFIG_SNAPSHOT_VERIFICATION for build of hibernate_keys.c depend on
> Kconfig.
> 
> Cc: Matthew Garrett <mjg59@...f.ucam.org>
> Cc: Takashi Iwai <tiwai@...e.de>
> Reviewed-by: Jiri Kosina <jkosina@...e.cz>
> Signed-off-by: Lee, Chun-Yi <jlee@...e.com>


> --- a/arch/x86/boot/compressed/eboot.c
> +++ b/arch/x86/boot/compressed/eboot.c
> @@ -368,6 +368,91 @@ free_handle:
>  	return status;
>  }
>  
> +#ifdef CONFIG_SNAPSHOT_VERIFICATION
> +static efi_status_t setup_s4_keys(struct boot_params *params)
> +{
> +	struct setup_data *data;
> +	unsigned long datasize;
> +	u32 attr;
> +	struct efi_s4_key *s4key;
> +	efi_status_t status;
> +
> +	data = (struct setup_data *)(unsigned long)params->hdr.setup_data;

A bit too many casts.

> @@ -1205,6 +1290,10 @@ struct boot_params *efi_main(void *handle, efi_system_table_t *_table,
>  
>  	setup_efi_pci(boot_params);
>  
> +#ifdef CONFIG_SNAPSHOT_VERIFICATION
> +	setup_s4_keys(boot_params);
> +#endif
> +

Move ifdef inside the function?

> @@ -729,6 +792,11 @@ void __init efi_init(void)
>  
>  	set_bit(EFI_SYSTEM_TABLES, &x86_efi_facility);
>  
> +#ifdef CONFIG_SNAPSHOT_VERIFICATION
> +	/* keep s4 key from setup_data */
> +	efi_reserve_s4_skey_data();
> +#endif
> +

Here too.

-- 
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