From: Reinette Chatre reinette.chatre@intel.com
commit 2154e1c11b7080aa19f47160bd26b6f39bbd7824 upstream.
Recent commit 08999b2489b4 ("x86/sgx: Free backing memory after faulting the enclave page") expanded __sgx_encl_eldu() to clear an enclave page's PCMD (Paging Crypto MetaData) from the PCMD page in the backing store after the enclave page is restored to the enclave.
Since the PCMD page in the backing store is modified the page should be marked as dirty to ensure the modified data is retained.
Cc: stable@vger.kernel.org Fixes: 08999b2489b4 ("x86/sgx: Free backing memory after faulting the enclave page") Signed-off-by: Reinette Chatre reinette.chatre@intel.com Signed-off-by: Dave Hansen dave.hansen@linux.intel.com Reviewed-by: Jarkko Sakkinen jarkko@kernel.org Tested-by: Haitao Huang haitao.huang@intel.com Link: https://lkml.kernel.org/r/00cd2ac480db01058d112e347b32599c1a806bc4.165238982... Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- arch/x86/kernel/cpu/sgx/encl.c | 1 + 1 file changed, 1 insertion(+)
--- a/arch/x86/kernel/cpu/sgx/encl.c +++ b/arch/x86/kernel/cpu/sgx/encl.c @@ -84,6 +84,7 @@ static int __sgx_encl_eldu(struct sgx_en }
memset(pcmd_page + b.pcmd_offset, 0, sizeof(struct sgx_pcmd)); + set_page_dirty(b.pcmd);
/* * The area for the PCMD in the page was zeroed above. Check if the