src/boot/efi/pe.c

   1 /* SPDX-License-Identifier: LGPL-2.1-or-later */
   2
   3 #include <efi.h>
   4 #include <efilib.h>
   5
   6 #include "pe.h"
   7 #include "util.h"
   8
   9 struct DosFileHeader {
  10         UINT8   Magic[2];
  11         UINT16  LastSize;
  12         UINT16  nBlocks;
  13         UINT16  nReloc;
  14         UINT16  HdrSize;
  15         UINT16  MinAlloc;
  16         UINT16  MaxAlloc;
  17         UINT16  ss;
  18         UINT16  sp;
  19         UINT16  Checksum;
  20         UINT16  ip;
  21         UINT16  cs;
  22         UINT16  RelocPos;
  23         UINT16  nOverlay;
  24         UINT16  reserved[4];
  25         UINT16  OEMId;
  26         UINT16  OEMInfo;
  27         UINT16  reserved2[10];
  28         UINT32  ExeHeader;
  29 } __attribute__((packed));
  30
  31 #define PE_HEADER_MACHINE_I386          0x014c
  32 #define PE_HEADER_MACHINE_X64           0x8664
  33 #define PE_HEADER_MACHINE_ARM64         0xaa64
  34 struct PeFileHeader {
  35         UINT16  Machine;
  36         UINT16  NumberOfSections;
  37         UINT32  TimeDateStamp;
  38         UINT32  PointerToSymbolTable;
  39         UINT32  NumberOfSymbols;
  40         UINT16  SizeOfOptionalHeader;
  41         UINT16  Characteristics;
  42 } __attribute__((packed));
  43
  44 struct PeHeader {
  45         UINT8   Magic[4];
  46         struct PeFileHeader FileHeader;
  47 } __attribute__((packed));
  48
  49 struct PeSectionHeader {
  50         UINT8   Name[8];
  51         UINT32  VirtualSize;
  52         UINT32  VirtualAddress;
  53         UINT32  SizeOfRawData;
  54         UINT32  PointerToRawData;
  55         UINT32  PointerToRelocations;
  56         UINT32  PointerToLinenumbers;
  57         UINT16  NumberOfRelocations;
  58         UINT16  NumberOfLinenumbers;
  59         UINT32  Characteristics;
  60 } __attribute__((packed));
  61
  62 EFI_STATUS pe_memory_locate_sections(CHAR8 *base, CHAR8 **sections, UINTN *addrs, UINTN *offsets, UINTN *sizes) {
  63         struct DosFileHeader *dos;
  64         struct PeHeader *pe;
  65         UINTN i;
  66         UINTN offset;
  67
  68         dos = (struct DosFileHeader *)base;
  69
  70         if (CompareMem(dos->Magic, "MZ", 2) != 0)
  71                 return EFI_LOAD_ERROR;
  72
  73         pe = (struct PeHeader *)&base[dos->ExeHeader];
  74         if (CompareMem(pe->Magic, "PE\0\0", 4) != 0)
  75                 return EFI_LOAD_ERROR;
  76
  77         /* PE32+ Subsystem type */
  78         if (pe->FileHeader.Machine != PE_HEADER_MACHINE_X64 &&
  79             pe->FileHeader.Machine != PE_HEADER_MACHINE_ARM64 &&
  80             pe->FileHeader.Machine != PE_HEADER_MACHINE_I386)
  81                 return EFI_LOAD_ERROR;
  82
  83         if (pe->FileHeader.NumberOfSections > 96)
  84                 return EFI_LOAD_ERROR;
  85
  86         offset = dos->ExeHeader + sizeof(*pe) + pe->FileHeader.SizeOfOptionalHeader;
  87
  88         for (i = 0; i < pe->FileHeader.NumberOfSections; i++) {
  89                 struct PeSectionHeader *sect;
  90                 UINTN j;
  91
  92                 sect = (struct PeSectionHeader *)&base[offset];
  93                 for (j = 0; sections[j]; j++) {
  94                         if (CompareMem(sect->Name, sections[j], strlena(sections[j])) != 0)
  95                                 continue;
  96
  97                         if (addrs)
  98                                 addrs[j] = (UINTN)sect->VirtualAddress;
  99                         if (offsets)
 100                                 offsets[j] = (UINTN)sect->PointerToRawData;
 101                         if (sizes)
 102                                 sizes[j] = (UINTN)sect->VirtualSize;
 103                 }
 104                 offset += sizeof(*sect);
 105         }
 106
 107         return EFI_SUCCESS;
 108 }
 109
 110 EFI_STATUS pe_file_locate_sections(EFI_FILE *dir, CHAR16 *path, CHAR8 **sections, UINTN *addrs, UINTN *offsets, UINTN *sizes) {
 111         EFI_FILE_HANDLE handle;
 112         struct DosFileHeader dos;
 113         struct PeHeader pe;
 114         UINTN len;
 115         UINTN headerlen;
 116         EFI_STATUS err;
 117         _cleanup_freepool_ CHAR8 *header = NULL;
 118
 119         err = uefi_call_wrapper(dir->Open, 5, dir, &handle, path, EFI_FILE_MODE_READ, 0ULL);
 120         if (EFI_ERROR(err))
 121                 return err;
 122
 123         /* MS-DOS stub */
 124         len = sizeof(dos);
 125         err = uefi_call_wrapper(handle->Read, 3, handle, &len, &dos);
 126         if (EFI_ERROR(err))
 127                 goto out;
 128         if (len != sizeof(dos)) {
 129                 err = EFI_LOAD_ERROR;
 130                 goto out;
 131         }
 132
 133         err = uefi_call_wrapper(handle->SetPosition, 2, handle, dos.ExeHeader);
 134         if (EFI_ERROR(err))
 135                 goto out;
 136
 137         len = sizeof(pe);
 138         err = uefi_call_wrapper(handle->Read, 3, handle, &len, &pe);
 139         if (EFI_ERROR(err))
 140                 goto out;
 141         if (len != sizeof(pe)) {
 142                 err = EFI_LOAD_ERROR;
 143                 goto out;
 144         }
 145
 146         headerlen = sizeof(dos) + sizeof(pe) + pe.FileHeader.SizeOfOptionalHeader + pe.FileHeader.NumberOfSections * sizeof(struct PeSectionHeader);
 147         header = AllocatePool(headerlen);
 148         if (!header) {
 149                 err = EFI_OUT_OF_RESOURCES;
 150                 goto out;
 151         }
 152         len = headerlen;
 153         err = uefi_call_wrapper(handle->SetPosition, 2, handle, 0);
 154         if (EFI_ERROR(err))
 155                 goto out;
 156
 157         err = uefi_call_wrapper(handle->Read, 3, handle, &len, header);
 158         if (EFI_ERROR(err))
 159                 goto out;
 160
 161         if (len != headerlen) {
 162                 err = EFI_LOAD_ERROR;
 163                 goto out;
 164         }
 165
 166         err = pe_memory_locate_sections(header, sections, addrs, offsets, sizes);
 167 out:
 168         uefi_call_wrapper(handle->Close, 1, handle);
 169         return err;
 170 }