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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160#!/usr/bin/env perl# SPDX-License-Identifier: GPL-2.0#use warnings;use strict;use Math::BigInt;use Fcntl "SEEK_SET";
die "Format: $0 [-s <systemmap-file>] <vmlinux-file> <keyring-file>\n" if ($#ARGV != 1 && $#ARGV != 3 || $#ARGV == 3 && $ARGV[0] ne "-s");
my $sysmap = "";if ($#ARGV == 3) { shift; $sysmap = $ARGV[0]; shift;}
my $vmlinux = $ARGV[0];my $keyring = $ARGV[1];
## Parse the vmlinux section table#open FD, "objdump -h $vmlinux |" || die $vmlinux;my @lines = <FD>;close(FD) || die $vmlinux;
my @sections = ();
foreach my $line (@lines) { chomp($line); if ($line =~ /\s*([0-9]+)\s+(\S+)\s+([0-9a-f]+)\s+([0-9a-f]+)\s+([0-9a-f]+)\s+([0-9a-f]+)\s+2[*][*]([0-9]+)/ ) { my $seg = $1; my $name = $2; my $len = Math::BigInt->new("0x" . $3); my $vma = Math::BigInt->new("0x" . $4); my $lma = Math::BigInt->new("0x" . $5); my $foff = Math::BigInt->new("0x" . $6); my $align = 2 ** $7;
push @sections, { name => $name, vma => $vma, len => $len, foff => $foff }; }}
print "Have $#sections sections\n";
## Try and parse the vmlinux symbol table. If the vmlinux file has been created# from a vmlinuz file with extract-vmlinux then the symbol table will be empty.#open FD, "nm $vmlinux 2>/dev/null |" || die $vmlinux;@lines = <FD>;close(FD) || die $vmlinux;
my %symbols = ();my $nr_symbols = 0;
sub parse_symbols(@) { foreach my $line (@_) { chomp($line); if ($line =~ /([0-9a-f]+)\s([a-zA-Z])\s(\S+)/ ) { my $addr = "0x" . $1; my $type = $2; my $name = $3;
$symbols{$name} = $addr; $nr_symbols++; } }}parse_symbols(@lines);
if ($nr_symbols == 0 && $sysmap ne "") { print "No symbols in vmlinux, trying $sysmap\n";
open FD, "<$sysmap" || die $sysmap; @lines = <FD>; close(FD) || die $sysmap; parse_symbols(@lines);}
die "No symbols available\n" if ($nr_symbols == 0);
print "Have $nr_symbols symbols\n";
die "Can't find system certificate list" unless (exists($symbols{"__cert_list_start"}) && exists($symbols{"system_certificate_list_size"}));
my $start = Math::BigInt->new($symbols{"__cert_list_start"});my $end;my $size;my $size_sym = Math::BigInt->new($symbols{"system_certificate_list_size"});
open FD, "<$vmlinux" || die $vmlinux;binmode(FD);
my $s = undef;foreach my $sec (@sections) { my $s_name = $sec->{name}; my $s_vma = $sec->{vma}; my $s_len = $sec->{len}; my $s_foff = $sec->{foff}; my $s_vend = $s_vma + $s_len;
next unless ($start >= $s_vma); next if ($start >= $s_vend);
die "Certificate list size was not found on the same section\n" if ($size_sym < $s_vma || $size_sym > $s_vend);
die "Cert object in multiple sections: ", $s_name, " and ", $s->{name}, "\n" if ($s);
my $size_off = $size_sym -$s_vma + $s_foff; my $packed; die $vmlinux if (!defined(sysseek(FD, $size_off, SEEK_SET))); sysread(FD, $packed, 8); $size = unpack 'L!', $packed; $end = $start + $size;
printf "Have %u bytes of certs at VMA 0x%x\n", $size, $start;
die "Cert object partially overflows section $s_name\n" if ($end > $s_vend);
$s = $sec;}
die "Cert object not inside a section\n" unless ($s);
print "Certificate list in section ", $s->{name}, "\n";
my $foff = $start - $s->{vma} + $s->{foff};
printf "Certificate list at file offset 0x%x\n", $foff;
die $vmlinux if (!defined(sysseek(FD, $foff, SEEK_SET)));my $buf = "";my $len = sysread(FD, $buf, $size);die "$vmlinux" if (!defined($len));die "Short read on $vmlinux\n" if ($len != $size);close(FD) || die $vmlinux;
open FD, ">$keyring" || die $keyring;binmode(FD);$len = syswrite(FD, $buf, $size);die "$keyring" if (!defined($len));die "Short write on $keyring\n" if ($len != $size);close(FD) || die $keyring;