linux-kernel - [RFC PATCH v0 12/19] x86/traps: Convert to insn

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Message-Id: <20201124101952.7909-13-bp@alien8.de>
Date:   Tue, 24 Nov 2020 11:19:45 +0100
From:   Borislav Petkov <bp@...en8.de>
To:     Andy Lutomirski <luto@...capital.net>,
        Masami Hiramatsu <mhiramat@...nel.org>
Cc:     X86 ML <x86@...nel.org>, LKML <linux-kernel@...r.kernel.org>
Subject: [RFC PATCH v0 12/19] x86/traps: Convert to insn_decode()

From: Borislav Petkov <bp@...e.de>

Simplify code, no functional changes.

Signed-off-by: Borislav Petkov <bp@...e.de>
---
 arch/x86/kernel/traps.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/arch/x86/kernel/traps.c b/arch/x86/kernel/traps.c
index e1b78829d909..4a06f79aaeeb 100644
--- a/arch/x86/kernel/traps.c
+++ b/arch/x86/kernel/traps.c
@@ -493,14 +493,15 @@ static enum kernel_gp_hint get_kernel_gp_address(struct pt_regs *regs,
 {
 	u8 insn_buf[MAX_INSN_SIZE];
 	struct insn insn;
+	int ret;
 
 	if (copy_from_kernel_nofault(insn_buf, (void *)regs->ip,
 			MAX_INSN_SIZE))
 		return GP_NO_HINT;
 
-	kernel_insn_init(&insn, insn_buf, MAX_INSN_SIZE);
-	insn_get_modrm(&insn);
-	insn_get_sib(&insn);
+	ret = insn_decode(&insn, insn_buf, MAX_INSN_SIZE, INSN_MODE_KERN);
+	if (ret < 0)
+		return GP_NO_HINT;
 
 	*addr = (unsigned long)insn_get_addr_ref(&insn, regs);
 	if (*addr == -1UL)
-- 
2.21.0