mirror of
https://github.com/ipxe/ipxe
synced 2026-01-02 18:03:36 +03:00
[efi] Nullify interfaces and leak memory on uninstallation failure
The UEFI specification allows uninstallation of a protocol interface to fail. There is no sensible way for code to react to this, since uninstallation is likely to be taking place on a code path that cannot itself fail (e.g. a code path that is itself a failure path). Where the protocol structure exists within a dynamically allocated block of memory, this leads to possible use-after-free bugs. Work around this unfortunate design choice by nullifying the protocol (i.e. overwriting the method pointers with no-ops) and leaking the memory containing the protocol structure. Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown
532
src/interface/efi/efi_null.c
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532
src/interface/efi/efi_null.c
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@@ -0,0 +1,532 @@
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/*
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* Copyright (C) 2020 Michael Brown <mbrown@fensystems.co.uk>.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of the
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* License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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* 02110-1301, USA.
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*
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* You can also choose to distribute this program under the terms of
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* the Unmodified Binary Distribution Licence (as given in the file
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* COPYING.UBDL), provided that you have satisfied its requirements.
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*/
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FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
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#include <string.h>
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#include <ipxe/efi/efi.h>
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#include <ipxe/efi/efi_null.h>
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/** @file
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*
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* EFI null interfaces
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*
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*/
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/******************************************************************************
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*
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* Simple Network Protocol
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*
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******************************************************************************
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*/
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static EFI_STATUS EFIAPI
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efi_null_snp_start ( EFI_SIMPLE_NETWORK_PROTOCOL *snp __unused ) {
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return EFI_UNSUPPORTED;
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}
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static EFI_STATUS EFIAPI
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efi_null_snp_stop ( EFI_SIMPLE_NETWORK_PROTOCOL *snp __unused ) {
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return EFI_UNSUPPORTED;
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}
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static EFI_STATUS EFIAPI
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efi_null_snp_initialize ( EFI_SIMPLE_NETWORK_PROTOCOL *snp __unused,
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UINTN extra_rx_bufsize __unused,
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UINTN extra_tx_bufsize __unused ) {
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return EFI_UNSUPPORTED;
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}
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static EFI_STATUS EFIAPI
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efi_null_snp_reset ( EFI_SIMPLE_NETWORK_PROTOCOL *snp __unused,
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BOOLEAN ext_verify __unused ) {
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return EFI_UNSUPPORTED;
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}
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static EFI_STATUS EFIAPI
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efi_null_snp_shutdown ( EFI_SIMPLE_NETWORK_PROTOCOL *snp __unused ) {
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return EFI_UNSUPPORTED;
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}
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static EFI_STATUS EFIAPI
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efi_null_snp_receive_filters ( EFI_SIMPLE_NETWORK_PROTOCOL *snp __unused,
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UINT32 enable __unused,
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UINT32 disable __unused,
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BOOLEAN mcast_reset __unused,
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UINTN mcast_count __unused,
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EFI_MAC_ADDRESS *mcast __unused ) {
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return EFI_UNSUPPORTED;
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}
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static EFI_STATUS EFIAPI
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efi_null_snp_station_address ( EFI_SIMPLE_NETWORK_PROTOCOL *snp __unused,
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BOOLEAN reset __unused,
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EFI_MAC_ADDRESS *new __unused ) {
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return EFI_UNSUPPORTED;
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}
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static EFI_STATUS EFIAPI
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efi_null_snp_statistics ( EFI_SIMPLE_NETWORK_PROTOCOL *snp __unused,
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BOOLEAN reset __unused, UINTN *stats_len __unused,
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EFI_NETWORK_STATISTICS *stats __unused ) {
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return EFI_UNSUPPORTED;
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}
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static EFI_STATUS EFIAPI
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efi_null_snp_mcast_ip_to_mac ( EFI_SIMPLE_NETWORK_PROTOCOL *snp __unused,
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BOOLEAN ipv6 __unused,
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EFI_IP_ADDRESS *ip __unused,
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EFI_MAC_ADDRESS *mac __unused ) {
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return EFI_UNSUPPORTED;
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}
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static EFI_STATUS EFIAPI
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efi_null_snp_nvdata ( EFI_SIMPLE_NETWORK_PROTOCOL *snp __unused,
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BOOLEAN read __unused, UINTN offset __unused,
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UINTN len __unused, VOID *data __unused ) {
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return EFI_UNSUPPORTED;
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}
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static EFI_STATUS EFIAPI
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efi_null_snp_get_status ( EFI_SIMPLE_NETWORK_PROTOCOL *snp __unused,
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UINT32 *interrupts __unused, VOID **txbuf __unused ) {
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return EFI_UNSUPPORTED;
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}
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static EFI_STATUS EFIAPI
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efi_null_snp_transmit ( EFI_SIMPLE_NETWORK_PROTOCOL *snp __unused,
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UINTN ll_header_len __unused, UINTN len __unused,
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VOID *data __unused, EFI_MAC_ADDRESS *ll_src __unused,
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EFI_MAC_ADDRESS *ll_dest __unused,
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UINT16 *net_proto __unused ) {
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return EFI_UNSUPPORTED;
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}
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static EFI_STATUS EFIAPI
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efi_null_snp_receive ( EFI_SIMPLE_NETWORK_PROTOCOL *snp __unused,
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UINTN *ll_header_len __unused, UINTN *len __unused,
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VOID *data __unused, EFI_MAC_ADDRESS *ll_src __unused,
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EFI_MAC_ADDRESS *ll_dest __unused,
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UINT16 *net_proto __unused ) {
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return EFI_UNSUPPORTED;
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}
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static EFI_SIMPLE_NETWORK_PROTOCOL efi_null_snp = {
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.Revision = EFI_SIMPLE_NETWORK_PROTOCOL_REVISION,
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.Start = efi_null_snp_start,
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.Stop = efi_null_snp_stop,
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.Initialize = efi_null_snp_initialize,
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.Reset = efi_null_snp_reset,
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.Shutdown = efi_null_snp_shutdown,
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.ReceiveFilters = efi_null_snp_receive_filters,
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.StationAddress = efi_null_snp_station_address,
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.Statistics = efi_null_snp_statistics,
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.MCastIpToMac = efi_null_snp_mcast_ip_to_mac,
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.NvData = efi_null_snp_nvdata,
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.GetStatus = efi_null_snp_get_status,
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.Transmit = efi_null_snp_transmit,
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.Receive = efi_null_snp_receive,
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};
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/**
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* Nullify SNP interface
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*
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* @v snp SNP interface
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*/
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void efi_nullify_snp ( EFI_SIMPLE_NETWORK_PROTOCOL *snp ) {
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memcpy ( snp, &efi_null_snp,
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offsetof ( typeof ( *snp ), WaitForPacket ) );
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snp->Mode->State = EfiSimpleNetworkStopped;
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}
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/******************************************************************************
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*
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* Network Interface Identification protocol
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*
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******************************************************************************
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*/
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static EFIAPI VOID efi_null_undi_issue ( UINT64 cdb_phys ) {
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PXE_CDB *cdb = ( ( void * ) ( intptr_t ) cdb_phys );
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cdb->StatCode = PXE_STATCODE_UNSUPPORTED;
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cdb->StatFlags = PXE_STATFLAGS_COMMAND_FAILED;
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}
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static PXE_SW_UNDI efi_null_undi __attribute__ (( aligned ( 16 ) )) = {
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.Signature = PXE_ROMID_SIGNATURE,
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.Len = sizeof ( efi_null_undi ),
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.Rev = PXE_ROMID_REV,
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.MajorVer = PXE_ROMID_MAJORVER,
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.MinorVer = PXE_ROMID_MINORVER,
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.Implementation = PXE_ROMID_IMP_SW_VIRT_ADDR,
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};
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/**
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* Nullify NII interface
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*
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* @v nii NII interface
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*/
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void efi_nullify_nii ( EFI_NETWORK_INTERFACE_IDENTIFIER_PROTOCOL *nii ) {
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efi_null_undi.EntryPoint = ( ( intptr_t ) efi_null_undi_issue );
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nii->Id = ( ( intptr_t ) &efi_null_undi );
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}
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/******************************************************************************
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*
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* Component name protocol
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*
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******************************************************************************
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*/
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static EFI_STATUS EFIAPI
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efi_null_get_driver_name ( EFI_COMPONENT_NAME2_PROTOCOL *name2 __unused,
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CHAR8 *language __unused,
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CHAR16 **driver_name __unused ) {
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return EFI_UNSUPPORTED;
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}
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static EFI_STATUS EFIAPI
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efi_null_get_controller_name ( EFI_COMPONENT_NAME2_PROTOCOL *name2 __unused,
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EFI_HANDLE device __unused,
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EFI_HANDLE child __unused,
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CHAR8 *language __unused,
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CHAR16 **controller_name __unused ) {
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return EFI_UNSUPPORTED;
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}
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static EFI_COMPONENT_NAME2_PROTOCOL efi_null_name2 = {
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.GetDriverName = efi_null_get_driver_name,
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.GetControllerName = efi_null_get_controller_name,
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.SupportedLanguages = "",
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};
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/**
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* Nullify Component Name Protocol interface
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*
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* @v name2 Component name protocol
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*/
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void efi_nullify_name2 ( EFI_COMPONENT_NAME2_PROTOCOL *name2 ) {
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memcpy ( name2, &efi_null_name2, sizeof ( name2 ) );
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}
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/******************************************************************************
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*
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* Load file protocol
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*
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******************************************************************************
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*/
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static EFI_STATUS EFIAPI
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efi_null_load_file ( EFI_LOAD_FILE_PROTOCOL *load_file __unused,
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EFI_DEVICE_PATH_PROTOCOL *path __unused,
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BOOLEAN booting __unused, UINTN *len __unused,
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VOID *data __unused ) {
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return EFI_UNSUPPORTED;
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}
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/**
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* Nullify Load File Protocol interface
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*
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* @v load_file Load file protocol
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*/
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void efi_nullify_load_file ( EFI_LOAD_FILE_PROTOCOL *load_file ) {
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load_file->LoadFile = efi_null_load_file;
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}
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/******************************************************************************
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*
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* HII configuration access protocol
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*
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******************************************************************************
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*/
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static EFI_STATUS EFIAPI
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efi_null_hii_extract ( const EFI_HII_CONFIG_ACCESS_PROTOCOL *hii __unused,
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EFI_STRING request __unused,
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EFI_STRING *progress __unused,
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EFI_STRING *results __unused ) {
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return EFI_UNSUPPORTED;
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}
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static EFI_STATUS EFIAPI
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efi_null_hii_route ( const EFI_HII_CONFIG_ACCESS_PROTOCOL *hii __unused,
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EFI_STRING config __unused,
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EFI_STRING *progress __unused ) {
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return EFI_UNSUPPORTED;
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}
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static EFI_STATUS EFIAPI
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efi_null_hii_callback ( const EFI_HII_CONFIG_ACCESS_PROTOCOL *hii __unused,
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EFI_BROWSER_ACTION action __unused,
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EFI_QUESTION_ID question_id __unused,
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UINT8 type __unused, EFI_IFR_TYPE_VALUE *value __unused,
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EFI_BROWSER_ACTION_REQUEST *action_request __unused ) {
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return EFI_UNSUPPORTED;
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}
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static EFI_HII_CONFIG_ACCESS_PROTOCOL efi_null_hii = {
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.ExtractConfig = efi_null_hii_extract,
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.RouteConfig = efi_null_hii_route,
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.Callback = efi_null_hii_callback,
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};
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/**
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* Nullify HII configuration access protocol
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*
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* @v hii HII configuration access protocol
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*/
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void efi_nullify_hii ( EFI_HII_CONFIG_ACCESS_PROTOCOL *hii ) {
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memcpy ( hii, &efi_null_hii, sizeof ( *hii ) );
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}
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/******************************************************************************
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*
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* Block I/O protocol
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*
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******************************************************************************
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*/
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static EFI_STATUS EFIAPI
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efi_null_block_reset ( EFI_BLOCK_IO_PROTOCOL *block __unused,
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BOOLEAN verify __unused ) {
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return EFI_UNSUPPORTED;
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}
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static EFI_STATUS EFIAPI
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efi_null_block_read ( EFI_BLOCK_IO_PROTOCOL *block __unused,
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UINT32 media __unused, EFI_LBA lba __unused,
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UINTN len __unused, VOID *data __unused ) {
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return EFI_UNSUPPORTED;
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}
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static EFI_STATUS EFIAPI
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efi_null_block_write ( EFI_BLOCK_IO_PROTOCOL *block __unused,
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UINT32 media __unused, EFI_LBA lba __unused,
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UINTN len __unused, VOID *data __unused ) {
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return EFI_UNSUPPORTED;
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}
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static EFI_STATUS EFIAPI
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efi_null_block_flush ( EFI_BLOCK_IO_PROTOCOL *block __unused ) {
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return EFI_UNSUPPORTED;
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}
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static EFI_BLOCK_IO_MEDIA efi_null_block_media;
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static EFI_BLOCK_IO_PROTOCOL efi_null_block = {
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.Revision = EFI_BLOCK_IO_INTERFACE_REVISION,
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.Media = &efi_null_block_media,
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.Reset = efi_null_block_reset,
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.ReadBlocks = efi_null_block_read,
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.WriteBlocks = efi_null_block_write,
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.FlushBlocks = efi_null_block_flush,
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};
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/**
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* Nullify block I/O protocol
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*
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* @v block Block I/O protocol
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*/
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void efi_nullify_block ( EFI_BLOCK_IO_PROTOCOL *block ) {
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memcpy ( block, &efi_null_block, sizeof ( *block ) );
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}
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/******************************************************************************
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*
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* PXE base code protocol
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*
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******************************************************************************
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*/
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static EFI_STATUS EFIAPI
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efi_null_pxe_start ( EFI_PXE_BASE_CODE_PROTOCOL *pxe __unused,
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BOOLEAN use_ipv6 __unused ) {
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return EFI_UNSUPPORTED;
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}
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static EFI_STATUS EFIAPI
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efi_null_pxe_stop ( EFI_PXE_BASE_CODE_PROTOCOL *pxe __unused ) {
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return EFI_UNSUPPORTED;
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}
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static EFI_STATUS EFIAPI
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efi_null_pxe_dhcp ( EFI_PXE_BASE_CODE_PROTOCOL *pxe __unused,
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BOOLEAN sort __unused ) {
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return EFI_UNSUPPORTED;
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}
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static EFI_STATUS EFIAPI
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efi_null_pxe_discover ( EFI_PXE_BASE_CODE_PROTOCOL *pxe __unused,
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UINT16 type __unused, UINT16 *layer __unused,
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BOOLEAN bis __unused,
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EFI_PXE_BASE_CODE_DISCOVER_INFO *info __unused ) {
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return EFI_UNSUPPORTED;
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}
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static EFI_STATUS EFIAPI
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efi_null_pxe_mtftp ( EFI_PXE_BASE_CODE_PROTOCOL *pxe __unused,
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EFI_PXE_BASE_CODE_TFTP_OPCODE opcode __unused,
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VOID *data __unused, BOOLEAN overwrite __unused,
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UINT64 *len __unused, UINTN *blksize __unused,
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EFI_IP_ADDRESS *ip __unused, UINT8 *filename __unused,
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EFI_PXE_BASE_CODE_MTFTP_INFO *info __unused,
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BOOLEAN callback __unused ) {
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return EFI_UNSUPPORTED;
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}
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static EFI_STATUS EFIAPI
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efi_null_pxe_udp_write ( EFI_PXE_BASE_CODE_PROTOCOL *pxe __unused,
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UINT16 flags __unused,
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EFI_IP_ADDRESS *dest_ip __unused,
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EFI_PXE_BASE_CODE_UDP_PORT *dest_port __unused,
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EFI_IP_ADDRESS *gateway __unused,
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EFI_IP_ADDRESS *src_ip __unused,
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EFI_PXE_BASE_CODE_UDP_PORT *src_port __unused,
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UINTN *hdr_len __unused, VOID *hdr __unused,
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UINTN *len __unused, VOID *data __unused ) {
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return EFI_UNSUPPORTED;
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||||
}
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||||
static EFI_STATUS EFIAPI
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efi_null_pxe_udp_read ( EFI_PXE_BASE_CODE_PROTOCOL *pxe __unused,
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UINT16 flags __unused,
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EFI_IP_ADDRESS *dest_ip __unused,
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EFI_PXE_BASE_CODE_UDP_PORT *dest_port __unused,
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||||
EFI_IP_ADDRESS *src_ip __unused,
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||||
EFI_PXE_BASE_CODE_UDP_PORT *src_port __unused,
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||||
UINTN *hdr_len __unused, VOID *hdr __unused,
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||||
UINTN *len __unused, VOID *data __unused ) {
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||||
return EFI_UNSUPPORTED;
|
||||
}
|
||||
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||||
static EFI_STATUS EFIAPI
|
||||
efi_null_pxe_set_ip_filter ( EFI_PXE_BASE_CODE_PROTOCOL *pxe __unused,
|
||||
EFI_PXE_BASE_CODE_IP_FILTER *filter __unused ) {
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||||
return EFI_UNSUPPORTED;
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||||
}
|
||||
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||||
static EFI_STATUS EFIAPI
|
||||
efi_null_pxe_arp ( EFI_PXE_BASE_CODE_PROTOCOL *pxe __unused,
|
||||
EFI_IP_ADDRESS *ip __unused,
|
||||
EFI_MAC_ADDRESS *mac __unused ) {
|
||||
return EFI_UNSUPPORTED;
|
||||
}
|
||||
|
||||
static EFI_STATUS EFIAPI
|
||||
efi_null_pxe_set_parameters ( EFI_PXE_BASE_CODE_PROTOCOL *pxe __unused,
|
||||
BOOLEAN *autoarp __unused,
|
||||
BOOLEAN *sendguid __unused, UINT8 *ttl __unused,
|
||||
UINT8 *tos __unused,
|
||||
BOOLEAN *callback __unused ) {
|
||||
return EFI_UNSUPPORTED;
|
||||
}
|
||||
|
||||
static EFI_STATUS EFIAPI
|
||||
efi_null_pxe_set_station_ip ( EFI_PXE_BASE_CODE_PROTOCOL *pxe __unused,
|
||||
EFI_IP_ADDRESS *ip __unused,
|
||||
EFI_IP_ADDRESS *netmask __unused ) {
|
||||
return EFI_UNSUPPORTED;
|
||||
}
|
||||
|
||||
static EFI_STATUS EFIAPI
|
||||
efi_null_pxe_set_packets ( EFI_PXE_BASE_CODE_PROTOCOL *pxe __unused,
|
||||
BOOLEAN *dhcpdisc_ok __unused,
|
||||
BOOLEAN *dhcpack_ok __unused,
|
||||
BOOLEAN *proxyoffer_ok __unused,
|
||||
BOOLEAN *pxebsdisc_ok __unused,
|
||||
BOOLEAN *pxebsack_ok __unused,
|
||||
BOOLEAN *pxebsbis_ok __unused,
|
||||
EFI_PXE_BASE_CODE_PACKET *dhcpdisc __unused,
|
||||
EFI_PXE_BASE_CODE_PACKET *dhcpack __unused,
|
||||
EFI_PXE_BASE_CODE_PACKET *proxyoffer __unused,
|
||||
EFI_PXE_BASE_CODE_PACKET *pxebsdisc __unused,
|
||||
EFI_PXE_BASE_CODE_PACKET *pxebsack __unused,
|
||||
EFI_PXE_BASE_CODE_PACKET *pxebsbis __unused ) {
|
||||
return EFI_UNSUPPORTED;
|
||||
}
|
||||
|
||||
static EFI_PXE_BASE_CODE_PROTOCOL efi_null_pxe = {
|
||||
.Revision = EFI_PXE_BASE_CODE_PROTOCOL_REVISION,
|
||||
.Start = efi_null_pxe_start,
|
||||
.Stop = efi_null_pxe_stop,
|
||||
.Dhcp = efi_null_pxe_dhcp,
|
||||
.Discover = efi_null_pxe_discover,
|
||||
.Mtftp = efi_null_pxe_mtftp,
|
||||
.UdpWrite = efi_null_pxe_udp_write,
|
||||
.UdpRead = efi_null_pxe_udp_read,
|
||||
.SetIpFilter = efi_null_pxe_set_ip_filter,
|
||||
.Arp = efi_null_pxe_arp,
|
||||
.SetParameters = efi_null_pxe_set_parameters,
|
||||
.SetStationIp = efi_null_pxe_set_station_ip,
|
||||
.SetPackets = efi_null_pxe_set_packets,
|
||||
};
|
||||
|
||||
/**
|
||||
* Nullify PXE base code protocol
|
||||
*
|
||||
* @v pxe PXE base code protocol
|
||||
*/
|
||||
void efi_nullify_pxe ( EFI_PXE_BASE_CODE_PROTOCOL *pxe ) {
|
||||
|
||||
memcpy ( pxe, &efi_null_pxe, offsetof ( typeof ( *pxe ), Mode ) );
|
||||
pxe->Mode->Started = FALSE;
|
||||
}
|
||||
|
||||
/******************************************************************************
|
||||
*
|
||||
* Apple Net Boot protocol
|
||||
*
|
||||
******************************************************************************
|
||||
*/
|
||||
|
||||
static EFI_STATUS EFIAPI
|
||||
efi_null_apple_dhcp ( EFI_APPLE_NET_BOOT_PROTOCOL *apple __unused,
|
||||
UINTN *len __unused, VOID *data __unused ) {
|
||||
return EFI_UNSUPPORTED;
|
||||
}
|
||||
|
||||
static EFI_STATUS EFIAPI
|
||||
efi_null_apple_bsdp ( EFI_APPLE_NET_BOOT_PROTOCOL *apple __unused,
|
||||
UINTN *len __unused, VOID *data __unused ) {
|
||||
return EFI_UNSUPPORTED;
|
||||
}
|
||||
|
||||
static EFI_APPLE_NET_BOOT_PROTOCOL efi_null_apple = {
|
||||
.GetDhcpResponse = efi_null_apple_dhcp,
|
||||
.GetBsdpResponse = efi_null_apple_bsdp,
|
||||
};
|
||||
|
||||
/**
|
||||
* Nullify Apple Net Boot protocol
|
||||
*
|
||||
* @v apple Apple Net Boot protocol
|
||||
*/
|
||||
void efi_nullify_apple ( EFI_APPLE_NET_BOOT_PROTOCOL *apple ) {
|
||||
|
||||
memcpy ( apple, &efi_null_apple, sizeof ( *apple ) );
|
||||
}
|
||||
Reference in New Issue
Block a user