linux-kernel - Re: [tpmdd-devel] [PATCH] TPM: Issue TPM_STARTUP at driver load if the TPM has not been started

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, 4 Oct 2012 12:02:47 -0600
From:	Jason Gunthorpe <jgunthorpe@...idianresearch.com>
To:	Kent Yoder <key@...ux.vnet.ibm.com>
Cc:	Peter.Huewe@...ineon.com, linux-kernel@...r.kernel.org,
	tpmdd-devel@...ts.sourceforge.net
Subject: Re: [tpmdd-devel] [PATCH] TPM: Issue TPM_STARTUP at driver load if
 the TPM has not been started

On Thu, Oct 04, 2012 at 12:41:15PM -0500, Kent Yoder wrote:

>   I'd rather see us just track the state and do the right thing
> here. If we don't get invalid postinit if we call tpm_startup during
> tpm_tis_init/tpm_tis_i2c_init, then set a flag we switch on here.

At least on my platform it is possible for tpm_tis_init to skip the
TPM_STARTUP path I added if kexec has been used, so it is not a
reliable indicator that the platform does/does not support the TPM.

Directly checking if the TPM has been started on resume seems fool
proof to me?

Jasson
--
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/