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# needrestart - Restart daemons after library updates.
#
# Authors:
# Thomas Liske <thomas@fiasko-nw.net>
#
# Copyright Holder:
# 2013 - 2025 (C) Thomas Liske <thomas@fiasko-nw.net>
#
# License:
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this package; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
#
#
# This package is based on the result of the following paper:
#
# Security Analysis of x86 Processor Microcode
# Daming D. Chen <ddchen@asu.edu>
# Gail-Joon Ahn <gahn@asu.edu>
#
# https://www.dcddcc.com/docs/2014_paper_microcode.pdf
#
package NeedRestart::uCode::AMD;
use strict;
use warnings;
use NeedRestart::uCode;
use NeedRestart::Utils;
use File::Basename;
use POSIX qw(uname);
use Locale::TextDomain 'needrestart';
my $LOGPREF = '[uCode/AMD]';
sub nr_ucode_init {
my ( $sysname, $nodename, $release, $version, $machine ) = uname;
my $is_x86 = ( $machine =~ /^(i\d86|x86_64)$/ );
die "$LOGPREF Not running on x86!\n" unless ($is_x86);
}
my $_ucodes;
sub _scan_ucodes {
my $debug = shift;
# scan AMD ucode files
foreach my $fn (</lib/firmware/amd-ucode/microcode_*.bin>) {
my $bn = basename( $fn, '.bin' );
my $fh;
unless ( open( $fh, '<:raw', $fn ) ) {
warn "$LOGPREF Failed to open ucode source file '$fn': $!\n";
next;
}
my @stat = stat($fh);
my $fpos = read( $fh, my $buf, 12 );
my ( $hdr_magic, $hdr_type, $hdr_size ) = unpack( 'a4VV', $buf );
if ( $hdr_magic ne "DMA\0" ) {
warn "$LOGPREF Invalid magic header ($hdr_magic)!\n";
next;
}
if ( $hdr_type != 0 ) {
warn "$LOGPREF Unsupported table type $hdr_type!\n";
next;
}
for ( ; $fpos < $hdr_size ; ) {
$fpos += read( $fh, $buf, 16 );
my ( $pkg_cpuid, $pkg_errmask, $pkg_errcomp, $pkg_prid, $pkg_unk )
= unpack( 'VVVvv', $buf );
if ( $pkg_cpuid > 0 ) {
$_ucodes->{cpuid}->{$pkg_cpuid} = $pkg_prid;
printf STDERR
"$LOGPREF cpuid 0x%08x: found processor id 0x%08x\n", $pkg_cpuid, $pkg_prid
if ($debug);
}
}
for ( ; $fpos < $stat[7] ; ) {
$fpos += read( $fh, $buf, 8 );
my ( $upd_type, $upd_size ) = unpack( 'VV', $buf );
$fpos += read( $fh, $buf, $upd_size );
my (
$pat_date, $pat_pid, $pat_did, $pat_dlen, $pat_iflg,
$pat_dchk, $pat_ndid, $pat_sdid, $pat_prid
) = unpack( 'VVvCCVVVv', $buf );
$_ucodes->{prid}->{$pat_prid} = $pat_pid;
printf STDERR
"$LOGPREF processor id 0x%08x: available ucode 0x%08x\n", $pat_prid, $pat_pid
if ($debug);
}
}
}
sub nr_ucode_check_real {
my $debug = shift;
my $ui = shift;
my $info = shift;
# check for AMD cpu
unless ( defined( $info->{vendor_id} )
&& $info->{vendor_id} eq 'AuthenticAMD' )
{
die "$LOGPREF #$info->{processor} cpu vendor id mismatch\n";
}
# get CPUID using kernel module
my $cpuid;
if ( open( my $fh, '<:raw', "/dev/cpu/$info->{processor}/cpuid" ) ) {
seek( $fh, 1, 0 );
read( $fh, my $eax, 16 );
close($fh);
$cpuid = unpack( 'V', $eax );
printf( STDERR
"$LOGPREF #$info->{processor} cpuid 0x%08x (/dev/cpu/$info->{processor}/cpuid)\n",
$cpuid
) if ($debug);
}
else {
warn
"$LOGPREF #$info->{processor} Failed to open /dev/cpu/$info->{processor}/cpuid (Missed \`modprobe cpuid\`?): $!\n"
if ($debug);
}
# get CPUID from /proc/cpuinfo
my $family = int( $info->{'cpu family'} );
my $xfamily = 0;
if ( $family > 0xf ) {
$xfamily = $family - 0xf;
$family = 0xf;
}
my $model = int( $info->{model} );
my $xmodel = $model >> 4;
$model = $model & 0xf;
my $stepping = int( $info->{stepping} );
my $eax =
( ( ( $xfamily & 0xff ) << 20 ) +
( ( $xmodel & 0xf ) << 16 ) +
( ( $family & 0xf ) << 8 ) +
( ( $model & 0xf ) << 4 ) +
( ( $stepping & 0xf ) << 0 ) );
printf( STDERR "$LOGPREF #$info->{processor} cpuid 0x%08x (/proc/cpuinfo)\n", $eax )
if ($debug);
if ($cpuid) {
if ( $cpuid != $eax ) {
warn "$LOGPREF #$info->{processor} CPUID mismatch detected!\n" if ($debug);
}
}
else {
$cpuid = $eax;
}
# get microcode version of cpu
my $ucode = hex( $info->{microcode} );
printf( STDERR "$LOGPREF #$info->{processor} running ucode 0x%08x\n", $ucode ) if ($debug);
unless ( defined($_ucodes) ) {
_scan_ucodes( $debug );
}
my %vars = ( CURRENT => sprintf( "0x%08x", $ucode ), );
# check for microcode updates
if ( exists( $_ucodes->{cpuid}->{$cpuid} ) ) {
my $prid = $_ucodes->{cpuid}->{$cpuid};
if ( exists( $_ucodes->{prid}->{$prid} ) ) {
$vars{AVAIL} = sprintf( "0x%08x", $_ucodes->{prid}->{$prid} );
print STDERR "$LOGPREF #$info->{processor} found ucode $vars{AVAIL}\n" if ($debug);
}
}
return %vars;
}
1;
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