I'm not sure that "panic" is the right word here. bpf_probe_read_kernel boils down to copy_from_kernel_nofault, which checks for an "allowed" address and then does the access. Any page faults turn into error returns instead of OOPSes. x86 disallows user addresses, the vsyscall page, and non canonical addresses.
Doing this from bpf assumes that all "allowed" addresses are side-effect-free and will either succeed or cleanly fault. Off the top of my head, MMIO space (including, oddities like the APIC page on CPUs that still have that) and TDX memory are not in this category.
Doing this from bpf assumes that all "allowed" addresses are side-effect-free and will either succeed or cleanly fault. Off the top of my head, MMIO space (including, oddities like the APIC page on CPUs that still have that) and TDX memory are not in this category.