linux-kernel - Re: [PATCH v4 1/2] vTPM: support little endian guests

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Thu, 16 Jul 2015 13:54:15 -0400
From:	"Hon Ching(Vicky) Lo" <honclo@...ux.vnet.ibm.com>
To:	Peter Hüwe <PeterHuewe@....de>
Cc:	tpmdd-devel@...ts.sourceforge.net,
	Ashley Lai <ashley@...leylai.com>,
	Vicky Lo <honclo2014@...il.com>, linux-kernel@...r.kernel.org,
	Joy Latten <jmlatten@...ux.vnet.ibm.com>
Subject: Re: [PATCH v4 1/2] vTPM: support little endian guests

Hi Peter,


On Mon, 2015-07-13 at 23:08 +0200, Peter Hüwe wrote:
> Hi Vicky,
> 
> sorry for the late reply
> 
> 
> > This patch makes the code endianness independent. We defined a
> > macro do_endian_conversion to apply endianness to raw integers
> > in the event entries so that they will be displayed properly.
> > tpm_binary_bios_measurements_show() is modified for the display.
> > 
> > Signed-off-by: Hon Ching(Vicky) Lo <honclo@...ux.vnet.ibm.com>
> > Signed-off-by: Joy Latten <jmlatten@...ux.vnet.ibm.com>
> 
> > b/drivers/char/tpm/tpm_eventlog.h index e7da086..267bfbd 100644
> > --- a/drivers/char/tpm/tpm_eventlog.h
> > +++ b/drivers/char/tpm/tpm_eventlog.h
> > @@ -6,6 +6,12 @@
> >  #define MAX_TEXT_EVENT		1000	/* Max event string length */
> >  #define ACPI_TCPA_SIG		"TCPA"	/* 0x41504354 /'TCPA' */
> > 
> > +#ifdef CONFIG_PPC64
> > +#define do_endian_conversion(x) be32_to_cpu(x)
> > +#else
> > +#define do_endian_conversion(x) x
> > +#endif
> 
> 
> Why is this macro needed?
> shouldn't the be32_to_cpu macro already do correct thing?
> Or am I missing something here?
> 
> 
> Thanks,
> Peter
> 
The macro is defined to not do the conversion in the architecture
that does not need it.


Regards,
Vicky

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/