linux-kernel - Re: TPM bug fix causes hang on suspend (2.6.35-rc4)

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Date:	Sat, 17 Jul 2010 16:12:23 +0200
From:	Thomas Meyer <thomas@...3r.de>
To:	Sarah Sharp <sarah.a.sharp@...ux.intel.com>
Cc:	tpmdd-devel@...ts.sourceforge.net,
	Rajiv Andrade <srajiv@...ux.vnet.ibm.com>,
	James Morris <jmorris@...ei.org>, linux-kernel@...r.kernel.org
Subject: Re: TPM bug fix causes hang on suspend (2.6.35-rc4)

Am Freitag, den 16.07.2010, 17:00 -0700 schrieb Sarah Sharp:
> I recently upgraded to 2.6.35-rc4, and I discovered that suspend no
> longer works on my Thinkpad x200s.  When I suspend with some programs
> open (specifically while buffy is reading my maildirs), the suspend
> light blinks forever and the system never suspends.
> 
> I bisected the issue down to commit b5edfef, which is a merge of James
> Morris' security-testing-2.6 tree, that only included this commit:
> 
> commit 02a077c52ef7631275a79862ffd9f3dbe9d38bc2
> Author: Rajiv Andrade <srajiv@...ux.vnet.ibm.com>
> Date:   Mon Jun 14 13:58:22 2010 -0300
> 
>     TPM: ReadPubEK output struct fix
>     
>     This patch adds a missing element of the ReadPubEK command output,
>     that prevents future overflow of this buffer when copying the
>     TPM output result into it.
>     
>     Prevents a kernel panic in case the user tries to read the
>     pubek from sysfs.
>     
>     Signed-off-by: Rajiv Andrade <srajiv@...ux.vnet.ibm.com>
>     Signed-off-by: James Morris <jmorris@...ei.org>
> 
> diff --git a/drivers/char/tpm/tpm.h b/drivers/char/tpm/tpm.h
> index 8e00b4d..792868d 100644
> --- a/drivers/char/tpm/tpm.h
> +++ b/drivers/char/tpm/tpm.h
> @@ -224,6 +224,7 @@ struct      tpm_readpubek_params_out {
>         u8      algorithm[4];
>         u8      encscheme[2];
>         u8      sigscheme[2];
> +       __be32  paramsize;
>         u8      parameters[12]; /*assuming RSA*/
>         __be32  keysize;
>         u8      modulus[256];
> 
> The dmesg captured over netconsole when suspend fails is attached, but
> it doesn't look very interesting.  lspci output is also attached.  I
> don't have any userspace programs installed that can use TPM, like
> trousers or libtspi1.
> 
> If I try just removing the tpm_tis, tpm_bios, and tpm modules before
> suspending, the suspend still fails.  If I recompile without TPM
> hardware support (CONFIG_TCG_TPM=n), suspend still fails.  However, if I
> also turn off the securityFS config option (CONFIG_SECURITYFS),
> suspend succeeds.
> 
> It looks like an odd commit to cause a suspend failure, but when I reset
> the git HEAD to the commit before the merge of this patch, and suspend
> works fine.  Can you fix this?
> 
> Sarah Sharp

Maybe same as https://bugzilla.kernel.org/show_bug.cgi?id=16256 ?



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