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H A D | sigstruct.c | 5f0ce664 Mon Nov 15 12:35:16 CST 2021 Jarkko Sakkinen <jarkko@kernel.org> selftests/sgx: Make data measurement for an enclave segment optional
For a heap makes sense to leave its contents "unmeasured" in the SGX enclave build process, meaning that they won't contribute to the cryptographic signature (a RSA-3072 signed SHA56 hash) of the enclave.
Enclaves are signed blobs where the signature is calculated both from page data and also from "structural properties" of the pages. For instance a page offset of *every* page added to the enclave is hashed.
For data, this is optional, not least because hashing a page has a significant contribution to the enclave load time. Thus, where there is no reason to hash, do not. The SGX ioctl interface supports this with SGX_PAGE_MEASURE flag. Only when the flag is *set*, data is measured.
Add seg->measure boolean flag to struct encl_segment. Only when the flag is set, include the segment data to the signature (represented by SIGSTRUCT architectural structure).
Signed-off-by: Jarkko Sakkinen <jarkko@kernel.org> Signed-off-by: Reinette Chatre <reinette.chatre@intel.com> Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com> Acked-by: Dave Hansen <dave.hansen@linux.intel.com> Link: https://lkml.kernel.org/r/625b6fe28fed76275e9238ec4e15ec3c0d87de81.1636997631.git.reinette.chatre@intel.com
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H A D | main.h | 5f0ce664 Mon Nov 15 12:35:16 CST 2021 Jarkko Sakkinen <jarkko@kernel.org> selftests/sgx: Make data measurement for an enclave segment optional
For a heap makes sense to leave its contents "unmeasured" in the SGX enclave build process, meaning that they won't contribute to the cryptographic signature (a RSA-3072 signed SHA56 hash) of the enclave.
Enclaves are signed blobs where the signature is calculated both from page data and also from "structural properties" of the pages. For instance a page offset of *every* page added to the enclave is hashed.
For data, this is optional, not least because hashing a page has a significant contribution to the enclave load time. Thus, where there is no reason to hash, do not. The SGX ioctl interface supports this with SGX_PAGE_MEASURE flag. Only when the flag is *set*, data is measured.
Add seg->measure boolean flag to struct encl_segment. Only when the flag is set, include the segment data to the signature (represented by SIGSTRUCT architectural structure).
Signed-off-by: Jarkko Sakkinen <jarkko@kernel.org> Signed-off-by: Reinette Chatre <reinette.chatre@intel.com> Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com> Acked-by: Dave Hansen <dave.hansen@linux.intel.com> Link: https://lkml.kernel.org/r/625b6fe28fed76275e9238ec4e15ec3c0d87de81.1636997631.git.reinette.chatre@intel.com
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H A D | load.c | 5f0ce664 Mon Nov 15 12:35:16 CST 2021 Jarkko Sakkinen <jarkko@kernel.org> selftests/sgx: Make data measurement for an enclave segment optional
For a heap makes sense to leave its contents "unmeasured" in the SGX enclave build process, meaning that they won't contribute to the cryptographic signature (a RSA-3072 signed SHA56 hash) of the enclave.
Enclaves are signed blobs where the signature is calculated both from page data and also from "structural properties" of the pages. For instance a page offset of *every* page added to the enclave is hashed.
For data, this is optional, not least because hashing a page has a significant contribution to the enclave load time. Thus, where there is no reason to hash, do not. The SGX ioctl interface supports this with SGX_PAGE_MEASURE flag. Only when the flag is *set*, data is measured.
Add seg->measure boolean flag to struct encl_segment. Only when the flag is set, include the segment data to the signature (represented by SIGSTRUCT architectural structure).
Signed-off-by: Jarkko Sakkinen <jarkko@kernel.org> Signed-off-by: Reinette Chatre <reinette.chatre@intel.com> Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com> Acked-by: Dave Hansen <dave.hansen@linux.intel.com> Link: https://lkml.kernel.org/r/625b6fe28fed76275e9238ec4e15ec3c0d87de81.1636997631.git.reinette.chatre@intel.com
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