Re: Detecting kprobes generated code addresses

[Masami Hiramatsu]

On Sun, 25 Dec 2016 12:13:20 +0900
Masami Hiramatsu <mhiramat@xxxxxxxxxx> wrote:

> On Thu, 22 Dec 2016 00:42:19 -0600
> Josh Poimboeuf <jpoimboe@xxxxxxxxxx> wrote:
> 
> > Hi Masami,
> > 
> > I would like to make __kernel_text_address() be able to detect whether
> > an address belongs to code which was generated by kprobes.  As far as I
> > can tell, that information seems to be in the 'pages' lists of
> > kprobe_insn_slots and kprobe_optinsn_slots.  But they seem to be
> > protected by mutexes.
> 
> Right. It is currently under mutex because it may kick
> page allocation. But I think it is easy to fix that :)

Hmm, IMHO, it seems that we should add a dummy (auto-generated)
symbol for optprobe trampoline code to kallsyms so that
__kernel_text_address() automatically returns true on it.

Thank you,

-- 
Masami Hiramatsu <mhiramat@xxxxxxxxxx>