Messages in this thread | | | Date | Mon, 5 Sep 2022 17:15:07 +0200 | From | Peter Zijlstra <> | Subject | Re: CONFIG_RETHUNK int3 filling prevents kprobes in function body |
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On Mon, Sep 05, 2022 at 05:09:16PM +0200, Peter Zijlstra wrote: > On Sun, Sep 04, 2022 at 11:07:13PM +0900, Masami Hiramatsu wrote: > > Hi Peter, > > > > I found that the CONFIG_RETHUNK code (path_return) fills the unused bytes > > with int3 for padding. Unfortunately, this prevents kprobes on the function > > body after the return code (e.g. branch blocks placed behind the return.) > > Prior to that CONFIG_SLS would already use "ret; int3"
FWIW, there is a compiler option pending to also stick an int3 after every unconditional jmp.
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