The NX bit is not just about security
What happened
While I’m taking a short break from low-level programming, here’s a story by a friend of mine, Sonya, about debugging a seemingly impossible bug in ARM code. This bug hunting saga started several months ago. While developing a bare-metal hypervisor on ARM64 for postmarketOS, I hit a strange bug: if I enabled the CTR_EL0 intercept (which was the whole purpose of the HV, so could not be skipped), the phone would rando…
Summary assembled by rule from the sources below