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The current TPM 2.0 device driver extends only the SHA1 PCR bank but the TCG Specification[1] recommends extending all active PCR banks, to prevent malicious users from setting unused PCR banks with fake measurements and quoting them. The existing in-kernel interface(tpm_pcr_extend()) expects only a SHA1 digest. To extend all active PCR banks with differing digest sizes, the SHA1 digest is padded with trailing 0's as needed. This patch reuses the defined digest sizes from the crypto subsystem, adding a dependency on CRYPTO_HASH_INFO module. [1] TPM 2.0 Specification referred here is "TCG PC Client Specific Platform Firmware Profile for TPM 2.0" Signed-off-by: Nayna Jain <nayna@linux.vnet.ibm.com> Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com> Tested-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com> Tested-by: Kenneth Goldman <kgold@linux.vnet.ibm.com> Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com> |
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Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. Please read the Documentation/process/changes.rst file, as it contains the requirements for building and running the kernel, and information about the problems which may result by upgrading your kernel.