mirror of https://github.com/ipxe/ipxe.git
[util] Improve processing of ROM images in Option::ROM
The Option::ROM module now compares the Code Type in the PCIR header to 0x00 (PC-AT) in order to check the presence of other header types (PnP, UNDI, iPXE, etc). The validity of these headers are checked not only by offset, but by range and signature checks also. The image checksum and initial size also depends on Code Type. Signed-off-by: Michael Brown <mcb30@ipxe.org>pull/88/head
Petr Borsodi
Michael Brown
parent
956f6a7227
commit
3f4c179a14
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@ -116,7 +116,9 @@ sub EXISTS {
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return ( exists $self->{fields}->{$key} &&
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( ( $self->{fields}->{$key}->{offset} +
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$self->{fields}->{$key}->{length} ) <= $self->{length} ) );
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$self->{fields}->{$key}->{length} ) <= $self->{length} ) &&
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( ! defined $self->{fields}->{$key}->{check} ||
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&{$self->{fields}->{$key}->{check}} ( $self, $key ) ) );
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}
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sub FIRSTKEY {
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@ -172,10 +174,11 @@ use constant ROM_SIGNATURE => 0xaa55;
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use constant PCI_SIGNATURE => 'PCIR';
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use constant PCI_LAST_IMAGE => 0x80;
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use constant PNP_SIGNATURE => '$PnP';
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use constant UNDI_SIGNATURE => 'UNDI';
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use constant IPXE_SIGNATURE => 'iPXE';
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our @EXPORT_OK = qw ( ROM_SIGNATURE PCI_SIGNATURE PCI_LAST_IMAGE
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PNP_SIGNATURE IPXE_SIGNATURE );
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PNP_SIGNATURE UNDI_SIGNATURE IPXE_SIGNATURE );
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our %EXPORT_TAGS = ( all => [ @EXPORT_OK ] );
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use constant JMP_SHORT => 0xeb;
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@ -210,10 +213,20 @@ sub unpack_init {
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} elsif ( $jump == 0 ) {
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return 0;
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} else {
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croak "Unrecognised jump instruction in init vector\n";
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carp "Unrecognised jump instruction in init vector\n";
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return 0;
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}
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}
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sub check_pcat_rom {
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my $self = shift;
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my $key = shift;
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my $pci = $self->{rom}->pci_header ();
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return ! defined $pci || $pci->{code_type} == 0x00;
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}
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=pod
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=item C<< new () >>
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@ -227,21 +240,29 @@ sub new {
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my $hash = {};
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tie %$hash, "Option::ROM::Fields", {
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rom => $hash, # ROM object itself
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data => undef,
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offset => 0x00,
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length => 0x20,
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file_offset => 0x0,
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fields => {
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signature => { offset => 0x00, length => 0x02, pack => "S" },
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length => { offset => 0x02, length => 0x01, pack => "C" },
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# "init" is part of a jump instruction
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init => { offset => 0x03, length => 0x03,
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pack => \&pack_init, unpack => \&unpack_init },
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checksum => { offset => 0x06, length => 0x01, pack => "C" },
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ipxe_header => { offset => 0x10, length => 0x02, pack => "S" },
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bofm_header => { offset => 0x14, length => 0x02, pack => "S" },
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undi_header => { offset => 0x16, length => 0x02, pack => "S" },
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pack => \&pack_init, unpack => \&unpack_init,
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check => \&check_pcat_rom },
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checksum => { offset => 0x06, length => 0x01, pack => "C",
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check => \&check_pcat_rom },
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ipxe_header => { offset => 0x10, length => 0x02, pack => "S",
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check => \&check_pcat_rom },
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bofm_header => { offset => 0x14, length => 0x02, pack => "S",
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check => \&check_pcat_rom },
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undi_header => { offset => 0x16, length => 0x02, pack => "S",
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check => \&check_pcat_rom },
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pci_header => { offset => 0x18, length => 0x02, pack => "S" },
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pnp_header => { offset => 0x1a, length => 0x02, pack => "S" },
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pnp_header => { offset => 0x1a, length => 0x02, pack => "S",
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check => \&check_pcat_rom },
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},
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};
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bless $hash, $class;
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@ -250,9 +271,9 @@ sub new {
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=pod
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=item C<< set ( $data ) >>
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=item C<< set ( $data [, $file_offset ] ) >>
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Set option ROM contents.
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Set option ROM contents, optionally sets original file offset.
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=cut
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@ -260,9 +281,11 @@ sub set {
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my $hash = shift;
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my $self = tied(%$hash);
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my $data = shift;
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my $file_offset = shift // 0x0;
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# Store data
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$self->{data} = \$data;
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$self->{file_offset} = $file_offset;
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# Split out any data belonging to the next image
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delete $self->{next_image};
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@ -273,7 +296,7 @@ sub set {
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my $remainder = substr ( $data, $length );
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$data = substr ( $data, 0, $length );
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$self->{next_image} = new Option::ROM;
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$self->{next_image}->set ( $remainder );
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$self->{next_image}->set ( $remainder, $self->{file_offset} + $length );
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}
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}
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@ -311,6 +334,7 @@ sub load {
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open my $fh, "<$filename"
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or croak "Cannot open $filename for reading: $!";
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binmode $fh;
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read $fh, my $data, -s $fh;
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$hash->set ( $data );
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close $fh;
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@ -335,6 +359,7 @@ sub save {
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open my $fh, ">$filename"
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or croak "Cannot open $filename for writing: $!";
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my $data = $hash->get();
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binmode $fh;
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print $fh $data;
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close $fh;
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}
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@ -369,9 +394,9 @@ sub pci_header {
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my $self = tied(%$hash);
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my $offset = $hash->{pci_header};
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return undef unless $offset != 0;
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return undef unless $offset;
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return Option::ROM::PCI->new ( $self->{data}, $offset );
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return Option::ROM::PCI->new ( $self, $offset );
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}
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=pod
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@ -388,9 +413,9 @@ sub pnp_header {
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my $self = tied(%$hash);
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my $offset = $hash->{pnp_header};
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return undef unless $offset != 0;
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return undef unless $offset;
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return Option::ROM::PnP->new ( $self->{data}, $offset );
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return Option::ROM::PnP->new ( $self, $offset );
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}
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=pod
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@ -407,9 +432,9 @@ sub undi_header {
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my $self = tied(%$hash);
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my $offset = $hash->{undi_header};
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return undef unless $offset != 0;
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return undef unless $offset;
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return Option::ROM::UNDI->new ( $self->{data}, $offset );
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return Option::ROM::UNDI->new ( $self, $offset );
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}
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=pod
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@ -426,9 +451,9 @@ sub ipxe_header {
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my $self = tied(%$hash);
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my $offset = $hash->{ipxe_header};
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return undef unless $offset != 0;
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return undef unless $offset;
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return Option::ROM::iPXE->new ( $self->{data}, $offset );
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return Option::ROM::iPXE->new ( $self, $offset );
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}
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=pod
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@ -475,9 +500,25 @@ sub fix_checksum {
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my $hash = shift;
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my $self = tied(%$hash);
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return unless ( exists $hash->{checksum} );
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$hash->{checksum} = ( ( $hash->{checksum} - $hash->checksum() ) & 0xff );
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}
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=pod
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=item C<< file_offset () >>
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Get file offset of image.
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=cut
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sub file_offset {
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my $hash = shift;
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my $self = tied(%$hash);
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return $self->{file_offset};
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}
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##############################################################################
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#
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# Option::ROM::PCI
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@ -493,12 +534,13 @@ use bytes;
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sub new {
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my $class = shift;
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my $data = shift;
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my $rom = shift;
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my $offset = shift;
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my $hash = {};
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tie %$hash, "Option::ROM::Fields", {
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data => $data,
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rom => $rom,
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data => $rom->{data},
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offset => $offset,
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length => 0x0c,
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fields => {
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@ -522,11 +564,17 @@ sub new {
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};
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bless $hash, $class;
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# Retrieve true length of structure
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my $self = tied ( %$hash );
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my $length = $rom->{rom}->length ();
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return undef unless ( $offset + $self->{length} <= $length &&
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$hash->{signature} eq Option::ROM::PCI_SIGNATURE &&
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$offset + $hash->{struct_length} <= $length );
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# Retrieve true length of structure
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$self->{length} = $hash->{struct_length};
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return $hash;
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return $hash;
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}
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sub device_list {
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@ -564,12 +612,13 @@ use bytes;
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sub new {
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my $class = shift;
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my $data = shift;
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my $rom = shift;
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my $offset = shift;
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my $hash = {};
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tie %$hash, "Option::ROM::Fields", {
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data => $data,
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rom => $rom,
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data => $rom->{data},
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offset => $offset,
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length => 0x06,
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fields => {
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@ -586,11 +635,17 @@ sub new {
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};
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bless $hash, $class;
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# Retrieve true length of structure
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my $self = tied ( %$hash );
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my $length = $rom->{rom}->length ();
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return undef unless ( $offset + $self->{length} <= $length &&
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$hash->{signature} eq Option::ROM::PNP_SIGNATURE &&
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$offset + $hash->{struct_length} * 16 <= $length );
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# Retrieve true length of structure
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$self->{length} = ( $hash->{struct_length} * 16 );
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return $hash;
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return $hash;
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}
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sub checksum {
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@ -644,12 +699,13 @@ use bytes;
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sub new {
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my $class = shift;
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my $data = shift;
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my $rom = shift;
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my $offset = shift;
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my $hash = {};
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tie %$hash, "Option::ROM::Fields", {
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data => $data,
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rom => $rom,
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data => $rom->{data},
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offset => $offset,
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length => 0x16,
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fields => {
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@ -669,8 +725,14 @@ sub new {
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};
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bless $hash, $class;
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# Retrieve true length of structure
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my $self = tied ( %$hash );
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my $length = $rom->{rom}->length ();
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return undef unless ( $offset + $self->{length} <= $length &&
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$hash->{signature} eq Option::ROM::UNDI_SIGNATURE &&
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$offset + $hash->{struct_length} <= $length );
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# Retrieve true length of structure
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$self->{length} = $hash->{struct_length};
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return $hash;
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@ -705,12 +767,13 @@ use bytes;
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sub new {
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my $class = shift;
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my $data = shift;
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my $rom = shift;
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my $offset = shift;
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my $hash = {};
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tie %$hash, "Option::ROM::Fields", {
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data => $data,
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rom => $rom,
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data => $rom->{data},
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offset => $offset,
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length => 0x06,
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fields => {
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@ -723,8 +786,14 @@ sub new {
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};
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bless $hash, $class;
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# Retrieve true length of structure
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my $self = tied ( %$hash );
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my $length = $rom->{rom}->length ();
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return undef unless ( $offset + $self->{length} <= $length &&
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$hash->{signature} eq Option::ROM::IPXE_SIGNATURE &&
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$offset + $hash->{struct_length} <= $length );
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# Retrieve true length of structure
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$self->{length} = $hash->{struct_length};
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return $hash;
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@ -28,8 +28,9 @@ my $romfile = shift || "-";
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my $rom = new Option::ROM;
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$rom->load ( $romfile );
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do {
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my $index = 0;
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do {
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die "Not an option ROM image\n"
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unless $rom->{signature} == ROM_SIGNATURE;
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@ -38,15 +39,16 @@ do {
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die "ROM image truncated (is $filelength, should be $romlength)\n"
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if $filelength < $romlength;
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printf "Index: %d, offset: 0x%08x\n\n", $index++, $rom->file_offset;
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printf "ROM header:\n\n";
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printf " %-16s 0x%02x (%d)\n", "Length:",
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$rom->{length}, ( $rom->{length} * 512 );
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printf " %-16s 0x%02x (%s0x%02x)\n", "Checksum:", $rom->{checksum},
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( ( $rom->checksum == 0 ) ? "" : "INCORRECT: " ), $rom->checksum;
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printf " %-16s 0x%04x\n", "Init:", $rom->{init};
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printf " %-16s 0x%04x\n", "UNDI header:", $rom->{undi_header};
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( ( $rom->checksum () == 0 ) ? "" : "INCORRECT: " ), $rom->checksum () if ( exists $rom->{checksum} );
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printf " %-16s 0x%04x\n", "Init:", $rom->{init} if ( defined $rom->{init} );
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printf " %-16s 0x%04x\n", "UNDI header:", $rom->{undi_header} if ( exists $rom->{undi_header} );
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printf " %-16s 0x%04x\n", "PCI header:", $rom->{pci_header};
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printf " %-16s 0x%04x\n", "PnP header:", $rom->{pnp_header};
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printf " %-16s 0x%04x\n", "PnP header:", $rom->{pnp_header} if ( exists $rom->{pnp_header} );
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printf "\n";
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my $pci = $rom->pci_header();
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