summaryrefslogtreecommitdiffstats
path: root/src/boot/efi/pe.c
blob: f99ecd0eda07555f462cadefc15e017d7d52ec0b (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
/* SPDX-License-Identifier: LGPL-2.1-or-later */

#include <efi.h>
#include <efilib.h>

#include "pe.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
#define PE_HEADER_MACHINE_ARM64         0xaa64
struct PeFileHeader {
        UINT16  Machine;
        UINT16  NumberOfSections;
        UINT32  TimeDateStamp;
        UINT32  PointerToSymbolTable;
        UINT32  NumberOfSymbols;
        UINT16  SizeOfOptionalHeader;
        UINT16  Characteristics;
} __attribute__((packed));

struct PeHeader {
        UINT8   Magic[4];
        struct PeFileHeader FileHeader;
} __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 pe_memory_locate_sections(CHAR8 *base, CHAR8 **sections, UINTN *addrs, UINTN *offsets, UINTN *sizes) {
        struct DosFileHeader *dos;
        struct PeHeader *pe;
        UINTN i;
        UINTN offset;

        dos = (struct DosFileHeader *)base;

        if (CompareMem(dos->Magic, "MZ", 2) != 0)
                return EFI_LOAD_ERROR;

        pe = (struct PeHeader *)&base[dos->ExeHeader];
        if (CompareMem(pe->Magic, "PE\0\0", 4) != 0)
                return EFI_LOAD_ERROR;

        /* PE32+ Subsystem type */
        if (pe->FileHeader.Machine != PE_HEADER_MACHINE_X64 &&
            pe->FileHeader.Machine != PE_HEADER_MACHINE_ARM64 &&
            pe->FileHeader.Machine != PE_HEADER_MACHINE_I386)
                return EFI_LOAD_ERROR;

        if (pe->FileHeader.NumberOfSections > 96)
                return EFI_LOAD_ERROR;

        offset = dos->ExeHeader + sizeof(*pe) + pe->FileHeader.SizeOfOptionalHeader;

        for (i = 0; i < pe->FileHeader.NumberOfSections; i++) {
                struct PeSectionHeader *sect;
                UINTN j;

                sect = (struct PeSectionHeader *)&base[offset];
                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;
                }
                offset += sizeof(*sect);
        }

        return EFI_SUCCESS;
}

EFI_STATUS pe_file_locate_sections(EFI_FILE *dir, CHAR16 *path, CHAR8 **sections, UINTN *addrs, UINTN *offsets, UINTN *sizes) {
        EFI_FILE_HANDLE handle;
        struct DosFileHeader dos;
        struct PeHeader pe;
        UINTN len;
        UINTN headerlen;
        EFI_STATUS err;
        _cleanup_freepool_ CHAR8 *header = NULL;

        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;
        }

        err = uefi_call_wrapper(handle->SetPosition, 2, handle, dos.ExeHeader);
        if (EFI_ERROR(err))
                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;
        }

        headerlen = sizeof(dos) + sizeof(pe) + pe.FileHeader.SizeOfOptionalHeader + pe.FileHeader.NumberOfSections * sizeof(struct PeSectionHeader);
        header = AllocatePool(headerlen);
        if (!header) {
                err = EFI_OUT_OF_RESOURCES;
                goto out;
        }
        len = headerlen;
        err = uefi_call_wrapper(handle->SetPosition, 2, handle, 0);
        if (EFI_ERROR(err))
                goto out;

        err = uefi_call_wrapper(handle->Read, 3, handle, &len, header);
        if (EFI_ERROR(err))
                goto out;

        if (len != headerlen) {
                err = EFI_LOAD_ERROR;
                goto out;
        }

        err = pe_memory_locate_sections(header, sections, addrs, offsets, sizes);
out:
        uefi_call_wrapper(handle->Close, 1, handle);
        return err;
}