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Enclaves have two basic states. They are either being built and are malleable and can be modified by doing things like adding pages. Or, they are locked down and not accepting changes. They can only be run after they have been locked down. The ENCLS[EINIT] function induces the transition from being malleable to locked-down. Add an ioctl() that performs ENCLS[EINIT]. After this, new pages can no longer be added with ENCLS[EADD]. This is also the time where the enclave can be measured to verify its integrity. Co-developed-by: Sean Christopherson <sean.j.christopherson@intel.com> Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com> Signed-off-by: Jarkko Sakkinen <jarkko@kernel.org> Signed-off-by: Borislav Petkov <bp@suse.de> Tested-by: Jethro Beekman <jethro@fortanix.com> Link: https://lkml.kernel.org/r/20201112220135.165028-15-jarkko@kernel.org |
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