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x86/mce: Convert to insn_decode()

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Simplify code, no functional changes.

Signed-off-by: Borislav Petkov <bp@suse.de>
Link: https://lkml.kernel.org/r/20210304174237.31945-11-bp@alien8.de
This commit is contained in:
Borislav Petkov 2020-11-06 19:39:08 +01:00
parent 63c66cde7b
commit 1580f488ea
1 changed files with 4 additions and 8 deletions
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12
arch/x86/kernel/cpu/mce/severity.c
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@ -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 */