On Tue, Mar 04, 2025 at 03:30:54PM -0800, Dave Hansen wrote: > On 3/4/25 14:56, Jarkko Sakkinen wrote: > > The total size calculated for EPC can overflow u64 given the added up page > > for SECS. Further, the total size calculated for shmem can overflow even > > when the EPC size stays within limits of u64, given that it adds the extra > > space for 128 byte PCMD structures (one for each page). > > > > Address this by adding the necessary validation for each partial results > > before going forward. Return -E2BIG when an overflow is detected. > > Wouldn't this be a lot simpler if we just had some sane limit that's > *FAR* below where u64 will overflow? Yes, we can simply check right at the get go that the uarch requirement of SGX is satisfied: secs->size is power of two. BR, Jarkko
