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[ Upstream commit0d3e0dfd68] 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. Fixes:888d249117("x86/sgx: Add SGX_IOC_ENCLAVE_CREATE") Reported-by: Dan Carpenter <dan.carpenter@linaro.org> Signed-off-by: Jarkko Sakkinen <jarkko@kernel.org> Signed-off-by: Ingo Molnar <mingo@kernel.org> Acked-by: Dave Hansen <dave.hansen@intel.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: "H. Peter Anvin" <hpa@zytor.com> Link: https://lore.kernel.org/r/20250305050006.43896-1-jarkko@kernel.org Closes: https://lore.kernel.org/linux-sgx/c87e01a0-e7dd-4749-a348-0980d3444f04@stanley.mountain/ Signed-off-by: Sasha Levin <sashal@kernel.org>