From: Masami Hiramatsu Date: Tue, 2 Mar 2021 15:25:24 +0000 (+0900) Subject: x86/kprobes: Retrieve correct opcode for group instruction X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=d60ad3d46f1d04a282c56159f1deb675c12733fd;p=linux.git x86/kprobes: Retrieve correct opcode for group instruction Since the opcodes start from 0xff are group5 instruction group which is not 2 bytes opcode but the extended opcode determined by the MOD/RM byte. The commit abd82e533d88 ("x86/kprobes: Do not decode opcode in resume_execution()") used insn->opcode.bytes[1], but that is not correct. We have to refer the insn->modrm.bytes[1] instead. Fixes: abd82e533d88 ("x86/kprobes: Do not decode opcode in resume_execution()") Signed-off-by: Masami Hiramatsu Signed-off-by: Peter Zijlstra (Intel) Link: https://lkml.kernel.org/r/161469872400.49483.18214724458034233166.stgit@devnote2 --- diff --git a/arch/x86/kernel/kprobes/core.c b/arch/x86/kernel/kprobes/core.c index 60a540fcbd56b..9b31790a0b0ad 100644 --- a/arch/x86/kernel/kprobes/core.c +++ b/arch/x86/kernel/kprobes/core.c @@ -453,7 +453,11 @@ static void set_resume_flags(struct kprobe *p, struct insn *insn) break; #endif case 0xff: - opcode = insn->opcode.bytes[1]; + /* + * Since the 0xff is an extended group opcode, the instruction + * is determined by the MOD/RM byte. + */ + opcode = insn->modrm.bytes[0]; if ((opcode & 0x30) == 0x10) { /* * call absolute, indirect