[$] May the FOLL_FORCE not be with you

One of the simplest hardening concepts to understand is that memory shouldnever be both writable and executable, otherwise an attacker can use it toload and run arbitrary code. That rule is generally followed in Linuxsystems, but there is a glaring loophole that is exploitable from userspace to inject code into a running process. Attackers have duly exploitedit. A new effort to close the hole ran into trouble early in the mergewindow, but a solution may yet be found in time for the 6.11 kernelrelease.