linux-kernel - [PATCH v2 10/21] x86/mce: Convert to insn

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20210224110233.19715-11-bp@alien8.de>
Date:   Wed, 24 Feb 2021 12:02:22 +0100
From:   Borislav Petkov <bp@...en8.de>
To:     X86 ML <x86@...nel.org>
Cc:     Masami Hiramatsu <mhiramat@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: [PATCH v2 10/21] x86/mce: 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/cpu/mce/severity.c | 12 ++++--------
 1 file changed, 4 insertions(+), 8 deletions(-)

diff --git a/arch/x86/kernel/cpu/mce/severity.c b/arch/x86/kernel/cpu/mce/severity.c
index 83df991314c5..a2136ced9d73 100644
--- a/arch/x86/kernel/cpu/mce/severity.c
+++ b/arch/x86/kernel/cpu/mce/severity.c
@@ -218,15 +218,15 @@ static struct severity {
 static bool is_copy_from_user(struct pt_regs *regs)
 {
 	u8 insn_buf[MAX_INSN_SIZE];
-	struct insn insn;
 	unsigned long addr;
+	struct insn insn;
+	int ret;
 
 	if (copy_from_kernel_nofault(insn_buf, (void *)regs->ip, MAX_INSN_SIZE))
 		return false;
 
-	kernel_insn_init(&insn, insn_buf, MAX_INSN_SIZE);
-	insn_get_opcode(&insn);
-	if (!insn.opcode.got)
+	ret = insn_decode(&insn, insn_buf, MAX_INSN_SIZE, INSN_MODE_KERN);
+	if (ret < 0)
 		return false;
 
 	switch (insn.opcode.value) {
@@ -234,10 +234,6 @@ static bool is_copy_from_user(struct pt_regs *regs)
 	case 0x8A: case 0x8B:
 	/* MOVZ mem,reg */
 	case 0xB60F: case 0xB70F:
-		insn_get_modrm(&insn);
-		insn_get_sib(&insn);
-		if (!insn.modrm.got || !insn.sib.got)
-			return false;
 		addr = (unsigned long)insn_get_addr_ref(&insn, regs);
 		break;
 	/* REP MOVS */
-- 
2.29.2