x86/sgx: Add ptrace() support for the SGX driver

Enclave memory is normally inaccessible from outside the enclave. This
makes enclaves hard to debug. However, enclaves can be put in a debug
mode when they are being built. In that mode, enclave data *can* be read
and/or written by using the ENCLS[EDBGRD] and ENCLS[EDBGWR] functions.

This is obviously only for debugging and destroys all the protections
present with normal enclaves. But, enclaves know their own debug status
and can adjust their behavior appropriately.

Add a vm_ops->access() implementation which can be used to read and write
memory inside debug enclaves.  This is typically used via ptrace() APIs.

 [ bp: Massage. ]

Signed-off-by: Jarkko Sakkinen <[email protected]>
Signed-off-by: Borislav Petkov <[email protected]>
Tested-by: Jethro Beekman <[email protected]>
Link: https://lkml.kernel.org/r/[email protected]

0 files changed, 0 insertions, 0 deletions