kprobes/x86: Use probe_kernel_read() instead of memcpy()

Use probe_kernel_read() for avoiding unexpected faults while
copying kernel text in __recover_probed_insn(),
__recover_optprobed_insn() and __copy_instruction().

Signed-off-by: Masami Hiramatsu <[email protected]>
Cc: Ananth N Mavinakayanahalli <[email protected]>
Cc: Andrey Ryabinin <[email protected]>
Cc: Anil S Keshavamurthy <[email protected]>
Cc: Borislav Petkov <[email protected]>
Cc: Brian Gerst <[email protected]>
Cc: David S . Miller <[email protected]>
Cc: Denys Vlasenko <[email protected]>
Cc: H. Peter Anvin <[email protected]>
Cc: Josh Poimboeuf <[email protected]>
Cc: Linus Torvalds <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: Ye Xiaolong <[email protected]>
Link: http://lkml.kernel.org/r/149076382624.22469.10091613887942958518.stgit@devbox
Signed-off-by: Ingo Molnar <[email protected]>

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