From: joeyli <jlee@suse.com>
To: Matt Fleming <matt@codeblueprint.co.uk>
Cc: "Lee, Chun-Yi" <joeyli.kernel@gmail.com>,
linux-kernel@vger.kernel.org, linux-efi@vger.kernel.org,
linux-pm@vger.kernel.org, "Rafael J. Wysocki" <rjw@rjwysocki.net>,
Matthew Garrett <matthew.garrett@nebula.com>,
Len Brown <len.brown@intel.com>, Pavel Machek <pavel@ucw.cz>,
Josh Boyer <jwboyer@redhat.com>, Vojtech Pavlik <vojtech@suse.cz>,
Matt Fleming <matt.fleming@intel.com>,
Jiri Kosina <jkosina@suse.cz>, "H. Peter Anvin" <hpa@zytor.com>,
Ingo Molnar <mingo@redhat.com>
Subject: Re: [PATCH v2 05/16] x86/efi: Get entropy through EFI random number generator protocol
Date: Thu, 27 Aug 2015 12:51:10 +0800 [thread overview]
Message-ID: <20150827045110.GD24088@linux-rxt1.site> (raw)
In-Reply-To: <20150820144706.GD2567@codeblueprint.co.uk>
On Thu, Aug 20, 2015 at 03:47:06PM +0100, Matt Fleming wrote:
> On Tue, 11 Aug, at 02:16:25PM, Lee, Chun-Yi wrote:
> > To grab random numbers through EFI protocol as one of the entropies
> > source of swsusp key, this patch adds the logic for accessing EFI RNG
> > (random number generator) protocol that's introduced since UEFI 2.4.
> >
> > Signed-off-by: Lee, Chun-Yi <jlee@suse.com>
> > ---
> > arch/x86/boot/compressed/efi_random.c | 209 ++++++++++++++++++++++++++++++++++
> > include/linux/efi.h | 13 +++
> > 2 files changed, 222 insertions(+)
>
> [...]
>
> Most of this looks good.
>
> > +static unsigned long efi_get_rng(efi_system_table_t *sys_table)
> > +{
> > + const struct efi_config *efi_early = __efi_early();
> > + unsigned long random = 0;
> > + efi_status_t status;
> > + void **rng_handle = NULL;
> > +
> > + status = efi_locate_rng(sys_table, &rng_handle);
> > + if (status != EFI_SUCCESS)
> > + return 0;
> > +
> > + if (efi_early->is64)
> > + random = efi_get_rng64(sys_table, rng_handle);
> > + else
> > + random = efi_get_rng32(sys_table, rng_handle);
> > +
> > + efi_call_early(free_pool, rng_handle);
> > +
> > + return random;
> > +}
>
> I think this function is named particularly poorly in the UEFI spec
> (GetRNG), can we maybe make this efi_get_rng_number(),
> efi_get_rng_value() or efi_get_rng_long() to match the existing
> naming?
>
Thanks for your suggestion, I will change the naming of functions.
> > diff --git a/include/linux/efi.h b/include/linux/efi.h
> > index 85ef051..8914d60 100644
> > --- a/include/linux/efi.h
> > +++ b/include/linux/efi.h
> > @@ -427,6 +427,16 @@ typedef struct {
> > #define EFI_PCI_IO_ATTRIBUTE_VGA_PALETTE_IO_16 0x20000
> > #define EFI_PCI_IO_ATTRIBUTE_VGA_IO_16 0x40000
> >
> > +typedef struct {
> > + u32 get_info;
> > + u32 get_rng;
> > +} efi_rng_protocol_32;
> > +
> > +typedef struct {
> > + u64 get_info;
> > + u64 get_rng;
> > +} efi_rng_protocol_64;
> > +
>
> We've been kinda slack with the naming conventions in efi.h but these
> should really both be 'efi_rng_protocol_*_t'.
>
I will also change the name of struct here.
> --
> Matt Fleming, Intel Open Source Technology Center
Thanks a lot!
Joey Lee
next prev parent reply other threads:[~2015-08-27 4:51 UTC|newest]
Thread overview: 43+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-08-11 6:16 [PATCH v2 00/16] Signature verification of hibernate snapshot Lee, Chun-Yi
2015-08-11 6:16 ` [PATCH v2 01/16] PM / hibernate: define HMAC algorithm and digest size of hibernation Lee, Chun-Yi
2015-08-11 6:16 ` [PATCH v2 02/16] x86/efi: Add get and set variable to EFI services pointer table Lee, Chun-Yi
2015-08-19 16:35 ` Matt Fleming
2015-08-11 6:16 ` [PATCH v2 03/16] x86/boot: Public getting random boot function Lee, Chun-Yi
2015-08-11 6:16 ` [PATCH v2 04/16] x86/efi: Generating random number in EFI stub Lee, Chun-Yi
2015-08-20 14:12 ` Matt Fleming
2015-08-27 4:06 ` joeyli
2015-08-11 6:16 ` [PATCH v2 05/16] x86/efi: Get entropy through EFI random number generator protocol Lee, Chun-Yi
2015-08-20 14:47 ` Matt Fleming
2015-08-27 4:51 ` joeyli [this message]
2015-08-20 20:26 ` Matt Fleming
2015-08-27 6:17 ` joeyli
2015-08-11 6:16 ` [PATCH v2 06/16] x86/efi: Generating random HMAC key for siging hibernate image Lee, Chun-Yi
2015-08-20 20:40 ` Matt Fleming
2015-08-27 9:04 ` joeyli
2015-09-09 12:15 ` Matt Fleming
2015-09-13 2:47 ` joeyli
2015-08-11 6:16 ` [PATCH v2 07/16] efi: Make efi_status_to_err() public Lee, Chun-Yi
2015-08-20 15:07 ` Matt Fleming
2015-08-27 9:06 ` joeyli
2015-08-11 6:16 ` [PATCH v2 08/16] x86/efi: Carrying hibernation key by setup data Lee, Chun-Yi
2015-08-15 17:07 ` Pavel Machek
2015-08-16 5:28 ` joeyli
2015-08-16 21:23 ` Jiri Kosina
2015-08-17 6:54 ` Nigel Cunningham
2015-08-21 12:40 ` Matt Fleming
2015-08-27 9:28 ` joeyli
2015-08-11 6:16 ` [PATCH v2 09/16] PM / hibernate: Reserve hibernation key and erase footprints Lee, Chun-Yi
2015-08-13 2:45 ` Chen, Yu C
2015-08-13 3:25 ` joeyli
2015-08-13 14:33 ` joeyli
2015-08-21 13:27 ` Matt Fleming
2015-08-27 10:21 ` joeyli
2015-09-09 12:24 ` Matt Fleming
2015-09-13 2:58 ` joeyli
2015-08-11 6:16 ` [PATCH v2 10/16] PM / hibernate: Generate and verify signature of hibernate snapshot Lee, Chun-Yi
2015-08-11 6:16 ` [PATCH v2 11/16] PM / hibernate: Avoid including hibernation key to hibernate image Lee, Chun-Yi
2015-08-11 6:16 ` [PATCH v2 12/16] PM / hibernate: Forward signature verifying result and key to image kernel Lee, Chun-Yi
2015-08-11 6:16 ` [PATCH v2 13/16] PM / hibernate: Add configuration to enforce signature verification Lee, Chun-Yi
2015-08-11 6:16 ` [PATCH v2 14/16] PM / hibernate: Allow user trigger hibernation key re-generating Lee, Chun-Yi
2015-08-11 6:16 ` [PATCH v2 15/16] PM / hibernate: Bypass verification logic on legacy BIOS Lee, Chun-Yi
2015-08-11 6:16 ` [PATCH v2 16/16] PM / hibernate: Document signature verification of hibernate snapshot Lee, Chun-Yi
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