Re: [PATCH v22 00/24] Intel SGX foundations

From: Dave Hansen
Date: Sat Sep 14 2019 - 11:32:44 EST

On 9/14/19 6:41 AM, Jarkko Sakkinen wrote:
> The proposed LSM hooks give the granularity to make yes/no decision
> based on the
> * The origin of the source of the source for the enclave.
> * The requested permissions for the added or mapped peage.
> The hooks to do these checks are provided for mmap() and EADD
> operations.
> With just file permissions you can still limit mmap() by having a
> privileged process to build the enclaves and pass the file descriptor
> to the enclave user who can mmap() the enclave within the constraints
> set by the enclave pages (their permissions refine the roof that you
> can mmap() any memory range within an enclave).

The LSM hooks are presumably fixing a problem that these patches
introduce. What's that problem?