I'm trying to attach to a kprobe event for purposes of tooling, but I'm not too familiar with kprobe events. I've read that the list of registered kprobes are available in /sys/kernel/debug/kprobes/list however sudo less /sys/kernel/debug/krpobes/list shows that there are no registered kprobes. I've confirmed that krpobes/enabled is 1. Am I doing something horribly wrong?
sys/kernel/debug/krpobes/list empty
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/sys/kernel/debug/kprobes/listhas the list of registered kprobes, not available kprobe hooks (cf. theThe kprobes debugfs interfacesection of the kprobes documentation).I don't think there's a list of available kprobe hooks somewhere. However,
/sys/kernel/debug/tracing/available_filter_functionshas a list of kprobe hooks available through ftrace. Most available functions should be in there. Otherwise, you can check the list of complete exposed functions in/proc/kallsymsand verify they are not blacklisted in/sys/kernel/debug/krpobes/blacklist. If a function is not in/proc/kallsyms, it's likely because is was inlined at compile time.So, no, nothing horrible :-)