kprobes vs __ex_table[]

From: Peter Zijlstra
Date: Thu Feb 23 2017 - 13:30:08 EST

Hi Masami,

I just wondered what would happen if I put a probe on an instruction
that was listed in __ex_table[] or __bug_table[].

And it looks like it will happily do that. It will then run the
instruction out-of-line, and when said instruction traps, the
instruction address will not match the one listed in either __ex_table[]
or __bug_table[] and badness will happen.

If kprobes does indeed not check this, we should probably fix it, if it
does do check this, could you point me to it?