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Diffstat (limited to 'src/grp-boot/systemd-boot/pefile.c')
-rw-r--r--src/grp-boot/systemd-boot/pefile.c170
1 files changed, 170 insertions, 0 deletions
diff --git a/src/grp-boot/systemd-boot/pefile.c b/src/grp-boot/systemd-boot/pefile.c
new file mode 100644
index 0000000000..77fff77b69
--- /dev/null
+++ b/src/grp-boot/systemd-boot/pefile.c
@@ -0,0 +1,170 @@
+/*
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation; either version 2.1 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
+ * Lesser General Public License for more details.
+ *
+ * Copyright (C) 2015 Kay Sievers <kay@vrfy.org>
+ */
+
+#include <efi.h>
+#include <efilib.h>
+
+#include "pefile.h"
+#include "util.h"
+
+struct DosFileHeader {
+ UINT8 Magic[2];
+ UINT16 LastSize;
+ UINT16 nBlocks;
+ UINT16 nReloc;
+ UINT16 HdrSize;
+ UINT16 MinAlloc;
+ UINT16 MaxAlloc;
+ UINT16 ss;
+ UINT16 sp;
+ UINT16 Checksum;
+ UINT16 ip;
+ UINT16 cs;
+ UINT16 RelocPos;
+ UINT16 nOverlay;
+ UINT16 reserved[4];
+ UINT16 OEMId;
+ UINT16 OEMInfo;
+ UINT16 reserved2[10];
+ UINT32 ExeHeader;
+} __attribute__((packed));
+
+#define PE_HEADER_MACHINE_I386 0x014c
+#define PE_HEADER_MACHINE_X64 0x8664
+struct PeFileHeader {
+ UINT16 Machine;
+ UINT16 NumberOfSections;
+ UINT32 TimeDateStamp;
+ UINT32 PointerToSymbolTable;
+ UINT32 NumberOfSymbols;
+ UINT16 SizeOfOptionalHeader;
+ UINT16 Characteristics;
+} __attribute__((packed));
+
+struct PeSectionHeader {
+ UINT8 Name[8];
+ UINT32 VirtualSize;
+ UINT32 VirtualAddress;
+ UINT32 SizeOfRawData;
+ UINT32 PointerToRawData;
+ UINT32 PointerToRelocations;
+ UINT32 PointerToLinenumbers;
+ UINT16 NumberOfRelocations;
+ UINT16 NumberOfLinenumbers;
+ UINT32 Characteristics;
+} __attribute__((packed));
+
+
+EFI_STATUS pefile_locate_sections(EFI_FILE *dir, CHAR16 *path, CHAR8 **sections, UINTN *addrs, UINTN *offsets, UINTN *sizes) {
+ EFI_FILE_HANDLE handle;
+ struct DosFileHeader dos;
+ uint8_t magic[4];
+ struct PeFileHeader pe;
+ UINTN len;
+ UINTN i;
+ EFI_STATUS err;
+
+ err = uefi_call_wrapper(dir->Open, 5, dir, &handle, path, EFI_FILE_MODE_READ, 0ULL);
+ if (EFI_ERROR(err))
+ return err;
+
+ /* MS-DOS stub */
+ len = sizeof(dos);
+ err = uefi_call_wrapper(handle->Read, 3, handle, &len, &dos);
+ if (EFI_ERROR(err))
+ goto out;
+ if (len != sizeof(dos)) {
+ err = EFI_LOAD_ERROR;
+ goto out;
+ }
+
+ if (CompareMem(dos.Magic, "MZ", 2) != 0) {
+ err = EFI_LOAD_ERROR;
+ goto out;
+ }
+
+ err = uefi_call_wrapper(handle->SetPosition, 2, handle, dos.ExeHeader);
+ if (EFI_ERROR(err))
+ goto out;
+
+ /* PE header */
+ len = sizeof(magic);
+ err = uefi_call_wrapper(handle->Read, 3, handle, &len, &magic);
+ if (EFI_ERROR(err))
+ goto out;
+ if (len != sizeof(magic)) {
+ err = EFI_LOAD_ERROR;
+ goto out;
+ }
+
+ if (CompareMem(magic, "PE\0\0", 2) != 0) {
+ err = EFI_LOAD_ERROR;
+ goto out;
+ }
+
+ len = sizeof(pe);
+ err = uefi_call_wrapper(handle->Read, 3, handle, &len, &pe);
+ if (EFI_ERROR(err))
+ goto out;
+ if (len != sizeof(pe)) {
+ err = EFI_LOAD_ERROR;
+ goto out;
+ }
+
+ /* PE32+ Subsystem type */
+ if (pe.Machine != PE_HEADER_MACHINE_X64 &&
+ pe.Machine != PE_HEADER_MACHINE_I386) {
+ err = EFI_LOAD_ERROR;
+ goto out;
+ }
+
+ if (pe.NumberOfSections > 96) {
+ err = EFI_LOAD_ERROR;
+ goto out;
+ }
+
+ /* the sections start directly after the headers */
+ err = uefi_call_wrapper(handle->SetPosition, 2, handle, dos.ExeHeader + sizeof(magic) + sizeof(pe) + pe.SizeOfOptionalHeader);
+ if (EFI_ERROR(err))
+ goto out;
+
+ for (i = 0; i < pe.NumberOfSections; i++) {
+ struct PeSectionHeader sect;
+ UINTN j;
+
+ len = sizeof(sect);
+ err = uefi_call_wrapper(handle->Read, 3, handle, &len, &sect);
+ if (EFI_ERROR(err))
+ goto out;
+ if (len != sizeof(sect)) {
+ err = EFI_LOAD_ERROR;
+ goto out;
+ }
+ for (j = 0; sections[j]; j++) {
+ if (CompareMem(sect.Name, sections[j], strlena(sections[j])) != 0)
+ continue;
+
+ if (addrs)
+ addrs[j] = (UINTN)sect.VirtualAddress;
+ if (offsets)
+ offsets[j] = (UINTN)sect.PointerToRawData;
+ if (sizes)
+ sizes[j] = (UINTN)sect.VirtualSize;
+ }
+ }
+
+out:
+ uefi_call_wrapper(handle->Close, 1, handle);
+ return err;
+}