On Wed, Mar 05, 2025 at 02:06:02AM +0200, 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 pre-evaluating the micro-architectural requirement of > SGX: the address space size must be power of two. This is eventually > checked up by ECREATE but the pre-check has the additional benefit of > making sure that there is some space for additional data. > > Reported-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx> > Closes: https://lore.kernel.org/linux-sgx/c87e01a0-e7dd-4749-a348-0980d3444f04@stanley.mountain/ > Signed-off-by: Jarkko Sakkinen <jarkko@xxxxxxxxxx> Cc: stable@xxxxxxxxxxxxxxx # v5.11+ Fixes: 888d24911787 ("x86/sgx: Add SGX_IOC_ENCLAVE_CREATE") BR, Jarkko
