On Wed, Oct 09, 2024 at 08:57:50PM -0400, Steven Rostedt wrote: > On Wed, 9 Oct 2024 20:56:47 -0400 > Steven Rostedt <rostedt@xxxxxxxxxxx> wrote: > > > I was thinking if something like objtool (could be something else that can > > read the executable code) and know of where functions are. It could just > > see if anything tests rdi, rsi, rdx, rcx, r8 or r9 (or their 32 bit > > alternatives) for NULL before using or setting it. > > > > If it does, then we know that one of the arguments could possibly be NULL. > > Oh, and it only needs to look at functions that are named: > > trace_event_raw_event_*() Unfortunately it's not that simple, the args could be moved around to other registers. And objtool doesn't have an emulator. Also it's not clear how that would deal with >6 args, or IS_ERR() as Jirka pointed out upthread. -- Josh
