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If there were any errors communicating with the TPM at the OS layer (open, read, write failures), the library would immediately exit, not allowing the caller to make any decisions about how to handle it. This introduces a way to initialize the library so that errors will get passed back up to the caller instead of unceremoniously exiting. Setting the environment variable "TPM_NO_EXIT=1" enables the feature. To avoid needing to implement supporting functions in all backends, the feature is currently limited to just the Tlcl stub implementation. In the case of mount-encrypted, it can now survive the kernel returning read/write failures. In the past it had only worked around having open fail, but that has now been replaced with more sensible logic instead of the environment variable trickiness. BUG=chrome-os-partner:15960 TEST=daisy built with an always-failing kernel driver, u-boot builds too BRANCH=None Change-Id: Ic7b217017537980f9c239d678067398613045676 Signed-off-by: Kees Cook <keescook@chromium.org> Reviewed-on: https://gerrit.chromium.org/gerrit/38791 Reviewed-by: Luigi Semenzato <semenzato@chromium.org>
arch/ is stuff that defines the architecture-dependent information (only used in firmware build mode). lib/ is stuff that the BIOS needs to link with. stub/ is stuff to be implemented by the BIOS. include/ describes the interfaces between the two parts.