Re: [PATCH v6] tpm: fix a race condition in tpm2_unseal_trusted()

[Jason Gunthorpe]

On Tue, Aug 30, 2016 at 01:51:06AM +0300, Jarkko Sakkinen wrote:
> Unseal and load operations should be done as an atomic operation. This
> commit introduces unlocked tpm_transmit() so that tpm2_unseal_trusted()
> can do the locking by itself.
> 
> v2: Introduced an unlocked unseal operation instead of changing locking
>     strategy in order to make less intrusive bug fix and thus more
>     backportable.
> 
> v3: Have also separate __tpm_transmit() that takes 'flags' in order to
>     better localize the bug fix and make it easier to backport.
> 
> v4: Cleaned up the control flow in tpm2_unseal_trusted. Added the
>     missing 'Fixes' line.
> 
> v5: Previous versions did not set the enum to any value, so it was set
>     to zero. Changed enum to TPM_TRANSMIT_UNLOCKED because it is
>     guaranteed to catch such situation. With change the common case
>     adds so little clutter that the wrappers do not make sense anymore.
> 
> v6: Added flags parameter to internal TPM command wrappers to have
>     an expected default behavior and documented them.

Yeah, this is nice.

BTW, do not put the vX: stuff into the commit message, and it would be
best to include it after the diffstat the patch email

Reviewed-by: Jason Gunthorpe <jgunthorpe@xxxxxxxxxxxxxxxxxxxx>

Jason