Unable to Dynamically Allocate Memory Using a Processor That Supports Intel® Software Guard Extensions (Intel® SGX) SGX2

1. Created an Intel® SGX application and used malloc to allocate memory
2. Configured the HeapMinSize and HeapMaxSize in the enclave configuration file
3. malloc returns nullptr after several allocations, before the memory allocation reaches HeapMaxSize
4. Memory is not being allocated dynamically

Only the legacy out-of-tree (OOT) Intel® SGX Linux* driver supports (Intel® SGX) SGX2.

Execute these commands to check which Intel® SGX driver is installed:

ls /dev/*sgx* #Should return /dev/isgx

lsmod | grep -i sgx #Should return: isgx

If the return values are not as above then the OOT driver is not installed and you probably have the Data Center Attestation Primitives (DCAP). Uninstall the DCAP driver before installing the OOT driver.

1. Uninstall the current driver
   sudo /opt/intel/sgxdriver/uninstall.sh # The path to uninstall.sh may differ for your system.

   If the uninstall.sh script is missing, uninstall as follows:

   sudo service aesmd stop

   sudo rm -f $(find /lib/modules -name intel_sgx.ko)

   sudo /sbin/depmod

   sudo sed -i '/^intel_sgx$/d' /etc/modules

   sudo rm -f /etc/sysconfig/modules/intel_sgx.modules

   sudo rm -f /etc/modules-load.d/intel_sgx.conf

2. Install the OOT driver using one of two methods
   • Download and install the latest driver binary, similar to sgx_linux_x64_driver_2.11.054c9c4c.bin, from the Linux distribution folder

     chmod 777 sgx_linux_x64_driver_2.11.054c9c4c.bin

     sudo ./sgx_linux_x64_driver_2.11.054c9c4c.bin

   • Build from source