diff options
Diffstat (limited to 'src/grp-boot/systemd-boot/pefile.c')
| -rw-r--r-- | src/grp-boot/systemd-boot/pefile.c | 170 |
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, §); + 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; +} |