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x86/alternatives: Teach text_poke_bp() to emulate RET

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Future patches will need to poke a RET instruction, provide the
infrastructure required for this.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Reviewed-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Link: https://lore.kernel.org/r/20200818135804.982214828@infradead.org
This commit is contained in:
Peter Zijlstra
2020-08-18 15:57:47 +02:00
committed by Ingo Molnar
parent f03c412915
commit c43a43e439
2 changed files with 24 additions and 0 deletions
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5
arch/x86/kernel/alternative.c
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@@ -1103,6 +1103,10 @@ noinstr int poke_int3_handler(struct pt_regs *regs)
*/
goto out_put;
case RET_INSN_OPCODE:
int3_emulate_ret(regs);
break;
case CALL_INSN_OPCODE:
int3_emulate_call(regs, (long)ip + tp->rel32);
break;
@@ -1277,6 +1281,7 @@ static void text_poke_loc_init(struct text_poke_loc *tp, void *addr,
switch (tp->opcode) {
case INT3_INSN_OPCODE:
case RET_INSN_OPCODE:
break;
case CALL_INSN_OPCODE: