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    SubjectRE: [PATCH v16 18/22] platform/x86: Intel SGX driver
    Date
    From: Jarkko Sakkinen
    > Sent: 06 November 2018 13:46
    >
    > Intel Software Guard eXtensions (SGX) is a set of CPU instructions that
    > can be used by applications to set aside private regions of code and
    > data. The code outside the enclave is disallowed to access the memory
    > inside the enclave by the CPU access control.
    >
    > SGX driver provides a ioctl API for loading and initializing enclaves.
    > Address range for enclaves is reserved with mmap() and they are
    > destroyed with munmap(). Enclave construction, measurement and
    > initialization is done with the provided the ioctl API.
    ..
    > +struct sgx_encl {
    > + unsigned int flags;
    > + uint64_t attributes;
    > + uint64_t xfrm;
    > + unsigned int page_cnt;
    > + unsigned int secs_child_cnt;
    > + struct mutex lock;
    > + struct mm_struct *mm;
    > + struct file *backing;
    > + struct kref refcount;
    > + unsigned long base;
    > + unsigned long size;
    > + unsigned long ssaframesize;
    > + struct radix_tree_root page_tree;
    > + struct list_head add_page_reqs;
    > + struct work_struct add_page_work;
    > + struct sgx_encl_page secs;
    > + struct pid *tgid;
    > + struct mmu_notifier mmu_notifier;
    > + struct notifier_block pm_notifier;
    > +};

    It may not really matter (yet) but there is at least one hole in that strcture.

    David

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