linux-kernel - Re: [PATCH 2/2] char/tpm: simplify duration calculation and eliminate sparse warning.

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Message-ID: <20121115164242.GD533@ennui.austin.ibm.com>
Date:	Thu, 15 Nov 2012 10:42:42 -0600
From:	Kent Yoder <key@...ux.vnet.ibm.com>
To:	Peter Hüwe <PeterHuewe@....de>
Cc:	Marcel Selhorst <tpmdd@...horst.net>, Sirrix AG <tpmdd@...rix.com>,
	tpmdd-devel@...ts.sourceforge.net, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] char/tpm: simplify duration calculation and
 eliminate sparse warning.

On Wed, Nov 14, 2012 at 11:37:06PM +0100, Peter Hüwe wrote:
> Am Mittwoch, 14. November 2012, 23:18:26 schrieb Kent Yoder:
> > On Mon, Nov 12, 2012 at 11:37:18PM +0100, Peter Huewe wrote:> > 
> > > This patch also gets rid of the (false positive) sparse warning:
> > >  drivers/char/tpm/tpm.c:360 tpm_calc_ordinal_duration() error: buffer
> > >  overflow 'tpm_protected_ordinal_duration' 12 <= 243
> > 
> >   I'm not seeing this sparse warning, how did you get it?
> 
> Oh sorry 
> s/sparse/smatch/
> 
> It was a smatch warning, not sparse - sorry about that:

  Ah, ok. The only other nit I had was that the spec references "TSC"
ordinals, but you had defined "TCS_MAX_ORDINAL". TCS is actually a piece
of TSS in user-space.

Kent

> /data/data-old/linux-2.6/drivers/char/tpm $ make -C /data/data-old/linux-2.6/ M=`pwd`  C=1 CHECK=smatch
> make: Entering directory `/data/data-old/linux-2.6'
>   LD      /data/data-old/linux-2.6/drivers/char/tpm/built-in.o
>   CHECK   /data/data-old/linux-2.6/drivers/char/tpm/tpm.c
> /data/data-old/linux-2.6/drivers/char/tpm/tpm.c:360 tpm_calc_ordinal_duration() error: buffer overflow 'tpm_protected_ordinal_duration' 12 <= 243
>   CC [M]  /data/data-old/linux-2.6/drivers/char/tpm/tpm.o
>   CHECK   /data/data-old/linux-2.6/drivers/char/tpm/tpm_eventlog.c
>   CC [M]  /data/data-old/linux-2.6/drivers/char/tpm/tpm_eventlog.o
>   CHECK   /data/data-old/linux-2.6/drivers/char/tpm/tpm_acpi.c
>   CC [M]  /data/data-old/linux-2.6/drivers/char/tpm/tpm_acpi.o
>   CHECK   /data/data-old/linux-2.6/drivers/char/tpm/tpm_ppi.c
>   CC [M]  /data/data-old/linux-2.6/drivers/char/tpm/tpm_ppi.o
>   LD [M]  /data/data-old/linux-2.6/drivers/char/tpm/tpm_bios.o
>   CHECK   /data/data-old/linux-2.6/drivers/char/tpm/tpm_tis.c
>   CC [M]  /data/data-old/linux-2.6/drivers/char/tpm/tpm_tis.o
>   CHECK   /data/data-old/linux-2.6/drivers/char/tpm/tpm_i2c_infineon.c
>   CC [M]  /data/data-old/linux-2.6/drivers/char/tpm/tpm_i2c_infineon.o
>   CHECK   /data/data-old/linux-2.6/drivers/char/tpm/tpm_nsc.c
>   CC [M]  /data/data-old/linux-2.6/drivers/char/tpm/tpm_nsc.o
>   CHECK   /data/data-old/linux-2.6/drivers/char/tpm/tpm_atmel.c
>   CC [M]  /data/data-old/linux-2.6/drivers/char/tpm/tpm_atmel.o
>   CHECK   /data/data-old/linux-2.6/drivers/char/tpm/tpm_infineon.c
>   CC [M]  /data/data-old/linux-2.6/drivers/char/tpm/tpm_infineon.o
>   Building modules, stage 2.
>   MODPOST 7 modules
>   CC      /data/data-old/linux-2.6/drivers/char/tpm/tpm.mod.o
>   LD [M]  /data/data-old/linux-2.6/drivers/char/tpm/tpm.ko
>   CC      /data/data-old/linux-2.6/drivers/char/tpm/tpm_atmel.mod.o
>   LD [M]  /data/data-old/linux-2.6/drivers/char/tpm/tpm_atmel.ko
>   CC      /data/data-old/linux-2.6/drivers/char/tpm/tpm_bios.mod.o
>   LD [M]  /data/data-old/linux-2.6/drivers/char/tpm/tpm_bios.ko
>   CC      /data/data-old/linux-2.6/drivers/char/tpm/tpm_i2c_infineon.mod.o
>   LD [M]  /data/data-old/linux-2.6/drivers/char/tpm/tpm_i2c_infineon.ko
>   CC      /data/data-old/linux-2.6/drivers/char/tpm/tpm_infineon.mod.o
>   LD [M]  /data/data-old/linux-2.6/drivers/char/tpm/tpm_infineon.ko
>   CC      /data/data-old/linux-2.6/drivers/char/tpm/tpm_nsc.mod.o
>   LD [M]  /data/data-old/linux-2.6/drivers/char/tpm/tpm_nsc.ko
>   CC      /data/data-old/linux-2.6/drivers/char/tpm/tpm_tis.mod.o
>   LD [M]  /data/data-old/linux-2.6/drivers/char/tpm/tpm_tis.ko
> make: Leaving directory `/data/data-old/linux-2.6'
> 

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