commit 0cdd192cf40fb6dbf03ec3af1c670068de3fd26c
author Andy Lutomirski <luto@amacapital.net> Fri Jul 11 10:27:01 2014 -0700
committer Ingo Molnar <mingo@kernel.org> Wed Jul 16 14:16:32 2014 +0200
tree cff55fbed83fc33982dd8b6226124731793a84c3
parent 4485154138f6ffa5b252cb490aba3e8eb30124e4

kprobes/x86: Don't try to resolve kprobe faults from userspace

This commit:

    commit 6f6343f53d133bae516caf3d254bce37d8774625
    Author: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
    Date:   Thu Apr 17 17:17:33 2014 +0900

        kprobes/x86: Call exception handlers directly from do_int3/do_debug

appears to have inadvertently dropped a check that the int3 came
from kernel mode.  Trying to dereference addr when addr is
user-controlled is completely bogus.

Signed-off-by: Andy Lutomirski <luto@amacapital.net>
Acked-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Link: http://lkml.kernel.org/r/c4e339882c121aa76254f2adde3fcbdf502faec2.1405099506.git.luto@amacapital.net
Signed-off-by: Ingo Molnar <mingo@kernel.org>