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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
#
package NeedRestart::uCode;
use strict;
use warnings;
use NeedRestart::Utils;
use Module::Find;
use Locale::TextDomain 'needrestart';
use constant {
NRM_UNKNOWN => 0,
NRM_CURRENT => 1,
NRM_OBSOLETE => 2,
};
require Exporter;
our @ISA = qw(Exporter);
our @EXPORT = qw(
nr_ucode_check
nr_ucode_register
NRM_UNKNOWN
NRM_CURRENT
NRM_OBSOLETE
);
my $LOGPREF = '[ucode]';
sub compare_ucode_versions {
my ($debug, $processor, %vars) = @_;
# if no firmware is available for the current CPU, that's
# considered up to date. the rationale here is that if we warn on
# this, we're actually going to warn for certain new CPUs that
# have an up-to-date, built-in firmware without any update. that,
# in turn, creates alert fatigue and makes operators more likely
# to ignore warnings.
unless ( exists( $vars{AVAIL} ) ) {
print STDERR
"$LOGPREF #$processor did not get available microcode version\n"
if ( $debug );
return NRM_CURRENT;
}
# from here on, there is a microcode file available
#
# if we can't find a microcode firmware for the current CPU,
# *that* is a problem.
unless ( exists( $vars{CURRENT} ) ) {
print STDERR
"$LOGPREF #$processor did not get current microcode version\n"
if ( $debug);
return NRM_UNKNOWN;
}
if ( hex( $vars{CURRENT} ) >= hex( $vars{AVAIL} ) ) {
return NRM_CURRENT;
}
return NRM_OBSOLETE;
}
sub nr_ucode_check {
my $debug = shift;
my $ui = shift;
my @PKGS;
# autoload ucode modules
foreach my $module ( findsubmod NeedRestart::uCode ) {
unless ( eval "use $module (); 1;" ) {
warn "$LOGPREF Failed to load $module: $@" if ( $@ && $debug );
}
else {
print STDERR "$LOGPREF using $module\n"
if ($debug);
push( @PKGS, $module );
}
}
unless ( scalar @PKGS > 0 ) {
print STDERR "$LOGPREF no supported processor microcode detection\n"
if ($debug);
return ( NRM_UNKNOWN, () );
}
# parse /proc/cpuinfo
my %processors;
my %sockels;
{
my $fh;
unless ( open( $fh, '<', '/proc/cpuinfo' ) ) {
warn "$LOGPREF Failed to read /proc/cpuinfo: $!\n"
if ($debug);
return ( NRM_UNKNOWN, () );
}
local $/ = "\n\n";
while (<$fh>) {
# transform key: value into hash
my %data;
foreach ( split(/\n+/) ) {
$data{$1} = $2 if (/^(.+\S)\s*: (.+)$/);
}
if ( defined( $data{processor} ) ) {
# save processor details
$processors{ $data{processor} } = \%data;
# save physical to logical mapping
my $sockel = 0;
if ( defined( $data{'physical id'} ) ) {
$sockel = $data{'physical id'};
}
push( @{ $sockels{$sockel} }, $data{processor} );
}
}
}
$ui->progress_prep( (scalar keys %sockels) * (scalar @PKGS),
__ 'Scanning processor microcode...' );
my ( $state, @vars ) = (NRM_UNKNOWN);
foreach my $sid ( keys %sockels ) {
my $pid = $sockels{$sid}[0];
# call ucode modules
foreach my $pkg (@PKGS) {
eval "${pkg}::nr_ucode_init();";
if ( $@ ) {
print STDERR $@ if ($debug);
next;
}
my @nvars;
eval "\@nvars = ${pkg}::nr_ucode_check_real(\$debug, \$ui, \$processors{\$pid});";
if ( $@ ) {
print STDERR $@
if ($debug);
$ui->progress_step;
next;
}
$ui->progress_step;
my $nstate = compare_ucode_versions( $debug, $pid, @nvars );
if ( $nstate > $state ) {
( $state, @vars ) = ( $nstate, @nvars );
}
if ( $nstate == NRM_OBSOLETE ) {
last;
}
}
}
$ui->progress_fin;
if ( $state == NRM_CURRENT && ! grep ( ( $_ eq "AVAIL"), @vars ) ) {
push(@vars, "AVAIL", "unavailable");
}
return ( $state, @vars );
}
1;
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