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Masami Hiramatsu authored
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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