9 points matheuzsec_ 2 days ago 6 comments
josephcsible 2 days ago | parent
This looks to me like you're copying the contents of an ELF binary from userspace memory into a kernel keyring, and then immediately copying it back from the kernel keyring to userspace memory, followed by userland exec the usual way. What's the point of the keyring steps, rather than just doing userland exec alone?
matheuzsec_ 2 days ago | parent
The keyring separates staging from execution, payload can be written by a different process at a different time with no file, no memfd, no open fd in /proc/pid/fd, by the time the loader runs, the payload only exists in kernel memory, direct userland exec still needs to read from somewhere visible
josephcsible 4 hours ago | parent
But then why mention execution at all, rather than just saying this is a place you can store arbitrary data?
mitxela 15 minutes ago | parent
An LLM probably told them it was honestly a genius idea.