Re: [PATCH] kprobes: add kprobe_is_function_probed()

[Jiri Kosina]

On Wed, 22 Oct 2014, Masami Hiramatsu wrote:

> > Add a function that allows external users (such as live patching 
> > mechanisms) to check whether a given function (identified by symbol name) 
> > has a kprobe installed in it.
> 
> Actually, we've already exported the list of kprobes with probe points
> (symbols) via debugfs. Please check /sys/kernel/debug/kprobes/list :)

Yes, I know, and kprobe_is_function_probed() is performing very similar 
thing that show_kprobe_addr() is doing.
But we'd like to be able to check this from within a kernel module (the 
patch module) and issue WARN().

Otherwise we'll need to have a machinery in userspace before insmod which 
will look up the functions in the module and compare them to the 
debufs-provided interface.

Also, I don't think we want to be dependent on debugfs being mounted and 
discoverable, etc ...

Thanks Masami,

-- 
Jiri Kosina
SUSE Labs
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