On Thu, Jan 27, 2022 at 11:46:49AM +0000, Mark Rutland wrote: > I'm not sure how x86 works here; AFAICT the relocations are performed during > decompression, but it looks like there's some special build-time processing > associated with that, and the vmlinux doesn't contain standard ELF > relocations. > > Kees, IIUC you added the x86_64 support there, can you shed any light on > if/how > this works on x86?
I think Sven beat me to it, and this was answered in https://lore.kernel.org/lkml/yt9dy231gzae....@linux.ibm.com but let me know if anything needs further info. An additional note is that x86 is built with "-2G addressing" (-mcmodel=kernel). There was some work done to make it actually PIE, which would allow the KASLR base to move further: https://github.com/KSPP/linux/issues/38 -Kees -- Kees Cook
