Warning in system log

[padgettr]

Hi, I'm getting a warning in the system log:
dwlb[492]: memfd_create() called without MFD_EXEC or MFD_NOEXEC_SEAL set

This appears to be due to this kernel patch applied to kernels 6.3 onwards:
https://lore.kernel.org/linux-security-module/20221209160453.3246150-4-jeffxu@google.com/

Changing memfd_create() in allocate_shm_file() apears to fix this for me, but note the call can fail on older kernels before 6.3, solution seems to be just to try to allocate, if fails, try again without the new flag, but I haven't tested that:
int fd = memfd_create("surface", MFD_CLOEXEC | MFD_ALLOW_SEALING | MFD_NOEXEC_SEAL);
I also added:
if (fcntl(fd, F_ADD_SEALS,
F_SEAL_GROW | F_SEAL_SHRINK | F_SEAL_SEAL) < 0)
{
fprintf(stderr, "Warning: failed to seal SHM memory file.");
}
before returning the fd.