Messages in this thread | | | Date | Tue, 17 Nov 2020 13:33:42 -0800 | From | Kees Cook <> | Subject | Re: [PATCH] tracepoint: Do not fail unregistering a probe due to memory allocation |
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On Mon, Nov 16, 2020 at 05:51:07PM -0500, Steven Rostedt wrote: > [ Kees, I added you because you tend to know about these things. > Is it OK to assign a void func(void) that doesn't do anything and returns > nothing to a function pointer that could be call with parameters? We need > to add stubs for tracepoints when we fail to allocate a new array on > removal of a callback, but the callbacks do have arguments, but the stub > called does not have arguments. > > Matt, Does this patch fix the error your patch was trying to fix? > ]
As I think got discussed in the thread, what you had here wouldn't work in a CFI build if the function prototype of the call site and the function don't match. (Though I can't tell if .func() is ever called?)
i.e. .func's prototype must match tp_stub_func()'s.
-- Kees Cook
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