Masami Hiramatsu 567a9fd867
kprobes/x86: Fix kprobes to skip prefixes correctly ...
Fix resume_execution() and is_IF_modifier() to skip x86
instruction prefixes correctly by using x86 instruction
attribute.
Without this fix, resume_execution() can't handle instructions
which have non-REX prefixes (REX prefixes are skipped). This
will cause unexpected kernel panic by hitting bad address when a
kprobe hits on two-byte ret (e.g. "repz ret" generated for
Athlon/K8 optimization), because it just checks "repz" and can't
recognize the "ret" instruction.
These prefixes can be found easily with x86 instruction
attribute. This patch introduces skip_prefixes() and uses it in
resume_execution() and is_IF_modifier() to skip prefixes.
Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com >
Cc: Ananth N Mavinakayanahalli <ananth@in.ibm.com >
LKML-Reference: <4C298A6E.8070609@hitachi.com >
Signed-off-by: Ingo Molnar <mingo@elte.hu >
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Masami Hiramatsu
567a9fd867