On 11/3/21 4:22 PM, Jarkko Sakkinen wrote:
> --- a/arch/x86/kernel/cpu/sgx/encl.c
> +++ b/arch/x86/kernel/cpu/sgx/encl.c
> @@ -22,6 +22,7 @@ static int __sgx_encl_eldu(struct sgx_encl_page *encl_page,
> {
> unsigned long va_offset = encl_page->desc & SGX_ENCL_PAGE_VA_OFFSET_MASK;
> struct sgx_encl *encl = encl_page->encl;
> + struct inode *inode = file_inode(encl->backing);
> struct sgx_pageinfo pginfo;
> struct sgx_backing b;
> pgoff_t page_index;
> @@ -60,6 +61,9 @@ static int __sgx_encl_eldu(struct sgx_encl_page *encl_page,
>
> sgx_encl_put_backing(&b, false);
>
> + /* Free the backing memory. */
> + shmem_truncate_range(inode, PFN_PHYS(page_index), PFN_PHYS(page_index) + PAGE_SIZE - 1);
> +
> return ret;
> }
This also misses tearing down the backing storage if it is in place at
sgx_encl_release().
Does a entry->epc_page==NULL page in there guarantee that it has backing
storage?
