]>
Commit | Line | Data |
---|---|---|
f7f94ffe SG |
1 | /**@file\r |
2 | \r | |
3 | Copyright (c) 2006 - 2009, Intel Corporation. All rights reserved.<BR>\r | |
4 | Portions copyright (c) 2008 - 2010, Apple Inc. All rights reserved.<BR>\r | |
5 | Portions copyright (c) 2011 - 2018, ARM Ltd. All rights reserved.<BR>\r | |
6 | \r | |
86094561 | 7 | SPDX-License-Identifier: BSD-2-Clause-Patent\r |
f7f94ffe SG |
8 | \r |
9 | **/\r | |
10 | \r | |
11 | #include <PiDxe.h>\r | |
12 | \r | |
13 | #include <Library/ArmMmuLib.h>\r | |
14 | #include <Library/BaseLib.h>\r | |
15 | #include <Library/BaseMemoryLib.h>\r | |
16 | #include <Library/DebugLib.h>\r | |
17 | #include <Library/PcdLib.h>\r | |
18 | #include <Library/PeCoffLib.h>\r | |
19 | #include <Library/PeCoffExtraActionLib.h>\r | |
20 | \r | |
21 | typedef RETURN_STATUS (*REGION_PERMISSION_UPDATE_FUNC) (\r | |
22 | IN EFI_PHYSICAL_ADDRESS BaseAddress,\r | |
23 | IN UINT64 Length\r | |
24 | );\r | |
25 | \r | |
26 | STATIC\r | |
27 | RETURN_STATUS\r | |
28 | UpdatePeCoffPermissions (\r | |
29 | IN CONST PE_COFF_LOADER_IMAGE_CONTEXT *ImageContext,\r | |
30 | IN REGION_PERMISSION_UPDATE_FUNC NoExecUpdater,\r | |
31 | IN REGION_PERMISSION_UPDATE_FUNC ReadOnlyUpdater\r | |
32 | )\r | |
33 | {\r | |
34 | RETURN_STATUS Status;\r | |
35 | EFI_IMAGE_OPTIONAL_HEADER_PTR_UNION Hdr;\r | |
36 | EFI_IMAGE_OPTIONAL_HEADER_UNION HdrData;\r | |
37 | UINTN Size;\r | |
38 | UINTN ReadSize;\r | |
39 | UINT32 SectionHeaderOffset;\r | |
40 | UINTN NumberOfSections;\r | |
41 | UINTN Index;\r | |
42 | EFI_IMAGE_SECTION_HEADER SectionHeader;\r | |
43 | PE_COFF_LOADER_IMAGE_CONTEXT TmpContext;\r | |
44 | EFI_PHYSICAL_ADDRESS Base;\r | |
45 | \r | |
46 | //\r | |
47 | // We need to copy ImageContext since PeCoffLoaderGetImageInfo ()\r | |
48 | // will mangle the ImageAddress field\r | |
49 | //\r | |
50 | CopyMem (&TmpContext, ImageContext, sizeof (TmpContext));\r | |
51 | \r | |
52 | if (TmpContext.PeCoffHeaderOffset == 0) {\r | |
53 | Status = PeCoffLoaderGetImageInfo (&TmpContext);\r | |
54 | if (RETURN_ERROR (Status)) {\r | |
55 | DEBUG ((DEBUG_ERROR,\r | |
56 | "%a: PeCoffLoaderGetImageInfo () failed (Status = %r)\n",\r | |
57 | __FUNCTION__, Status));\r | |
58 | return Status;\r | |
59 | }\r | |
60 | }\r | |
61 | \r | |
62 | if (TmpContext.IsTeImage &&\r | |
63 | TmpContext.ImageAddress == ImageContext->ImageAddress) {\r | |
64 | DEBUG ((DEBUG_INFO, "%a: ignoring XIP TE image at 0x%lx\n", __FUNCTION__,\r | |
65 | ImageContext->ImageAddress));\r | |
66 | return RETURN_SUCCESS;\r | |
67 | }\r | |
68 | \r | |
69 | if (TmpContext.SectionAlignment < EFI_PAGE_SIZE) {\r | |
70 | //\r | |
71 | // The sections need to be at least 4 KB aligned, since that is the\r | |
72 | // granularity at which we can tighten permissions. So just clear the\r | |
73 | // noexec permissions on the entire region.\r | |
74 | //\r | |
75 | if (!TmpContext.IsTeImage) {\r | |
76 | DEBUG ((DEBUG_WARN,\r | |
77 | "%a: non-TE Image at 0x%lx has SectionAlignment < 4 KB (%lu)\n",\r | |
78 | __FUNCTION__, ImageContext->ImageAddress, TmpContext.SectionAlignment));\r | |
79 | }\r | |
80 | Base = ImageContext->ImageAddress & ~(EFI_PAGE_SIZE - 1);\r | |
81 | Size = ImageContext->ImageAddress - Base + ImageContext->ImageSize;\r | |
82 | return NoExecUpdater (Base, ALIGN_VALUE (Size, EFI_PAGE_SIZE));\r | |
83 | }\r | |
84 | \r | |
85 | //\r | |
86 | // Read the PE/COFF Header. For PE32 (32-bit) this will read in too much\r | |
87 | // data, but that should not hurt anything. Hdr.Pe32->OptionalHeader.Magic\r | |
88 | // determines if this is a PE32 or PE32+ image. The magic is in the same\r | |
89 | // location in both images.\r | |
90 | //\r | |
91 | Hdr.Union = &HdrData;\r | |
92 | Size = sizeof (EFI_IMAGE_OPTIONAL_HEADER_UNION);\r | |
93 | ReadSize = Size;\r | |
94 | Status = TmpContext.ImageRead (TmpContext.Handle,\r | |
95 | TmpContext.PeCoffHeaderOffset, &Size, Hdr.Pe32);\r | |
96 | if (RETURN_ERROR (Status) || (Size != ReadSize)) {\r | |
97 | DEBUG ((DEBUG_ERROR,\r | |
98 | "%a: TmpContext.ImageRead () failed (Status = %r)\n",\r | |
99 | __FUNCTION__, Status));\r | |
100 | return Status;\r | |
101 | }\r | |
102 | \r | |
103 | ASSERT (Hdr.Pe32->Signature == EFI_IMAGE_NT_SIGNATURE);\r | |
104 | \r | |
105 | SectionHeaderOffset = TmpContext.PeCoffHeaderOffset + sizeof (UINT32) +\r | |
106 | sizeof (EFI_IMAGE_FILE_HEADER);\r | |
107 | NumberOfSections = (UINTN)(Hdr.Pe32->FileHeader.NumberOfSections);\r | |
108 | \r | |
109 | switch (Hdr.Pe32->OptionalHeader.Magic) {\r | |
110 | case EFI_IMAGE_NT_OPTIONAL_HDR32_MAGIC:\r | |
111 | SectionHeaderOffset += Hdr.Pe32->FileHeader.SizeOfOptionalHeader;\r | |
112 | break;\r | |
113 | case EFI_IMAGE_NT_OPTIONAL_HDR64_MAGIC:\r | |
114 | SectionHeaderOffset += Hdr.Pe32Plus->FileHeader.SizeOfOptionalHeader;\r | |
115 | break;\r | |
116 | default:\r | |
117 | ASSERT (FALSE);\r | |
118 | }\r | |
119 | \r | |
120 | //\r | |
121 | // Iterate over the sections\r | |
122 | //\r | |
123 | for (Index = 0; Index < NumberOfSections; Index++) {\r | |
124 | //\r | |
125 | // Read section header from file\r | |
126 | //\r | |
127 | Size = sizeof (EFI_IMAGE_SECTION_HEADER);\r | |
128 | ReadSize = Size;\r | |
129 | Status = TmpContext.ImageRead (TmpContext.Handle, SectionHeaderOffset,\r | |
130 | &Size, &SectionHeader);\r | |
131 | if (RETURN_ERROR (Status) || (Size != ReadSize)) {\r | |
132 | DEBUG ((DEBUG_ERROR,\r | |
133 | "%a: TmpContext.ImageRead () failed (Status = %r)\n",\r | |
134 | __FUNCTION__, Status));\r | |
135 | return Status;\r | |
136 | }\r | |
137 | \r | |
138 | Base = TmpContext.ImageAddress + SectionHeader.VirtualAddress;\r | |
139 | \r | |
140 | if ((SectionHeader.Characteristics & EFI_IMAGE_SCN_MEM_EXECUTE) == 0) {\r | |
141 | \r | |
77746e70 | 142 | if ((SectionHeader.Characteristics & EFI_IMAGE_SCN_MEM_WRITE) == 0) {\r |
f7f94ffe SG |
143 | \r |
144 | DEBUG ((DEBUG_INFO,\r | |
145 | "%a: Mapping section %d of image at 0x%lx with RO-XN permissions and size 0x%x\n",\r | |
146 | __FUNCTION__, Index, Base, SectionHeader.Misc.VirtualSize));\r | |
147 | ReadOnlyUpdater (Base, SectionHeader.Misc.VirtualSize);\r | |
148 | } else {\r | |
149 | DEBUG ((DEBUG_WARN,\r | |
150 | "%a: Mapping section %d of image at 0x%lx with RW-XN permissions and size 0x%x\n",\r | |
151 | __FUNCTION__, Index, Base, SectionHeader.Misc.VirtualSize));\r | |
152 | }\r | |
153 | } else {\r | |
f7f94ffe SG |
154 | DEBUG ((DEBUG_INFO,\r |
155 | "%a: Mapping section %d of image at 0x%lx with RO-X permissions and size 0x%x\n",\r | |
156 | __FUNCTION__, Index, Base, SectionHeader.Misc.VirtualSize));\r | |
77746e70 | 157 | ReadOnlyUpdater (Base, SectionHeader.Misc.VirtualSize);\r |
f7f94ffe SG |
158 | NoExecUpdater (Base, SectionHeader.Misc.VirtualSize);\r |
159 | }\r | |
160 | \r | |
161 | SectionHeaderOffset += sizeof (EFI_IMAGE_SECTION_HEADER);\r | |
162 | }\r | |
163 | return RETURN_SUCCESS;\r | |
164 | }\r | |
165 | \r | |
166 | /**\r | |
167 | Performs additional actions after a PE/COFF image has been loaded and relocated.\r | |
168 | \r | |
169 | If ImageContext is NULL, then ASSERT().\r | |
170 | \r | |
171 | @param ImageContext Pointer to the image context structure that describes the\r | |
172 | PE/COFF image that has already been loaded and relocated.\r | |
173 | \r | |
174 | **/\r | |
175 | VOID\r | |
176 | EFIAPI\r | |
177 | PeCoffLoaderRelocateImageExtraAction (\r | |
178 | IN OUT PE_COFF_LOADER_IMAGE_CONTEXT *ImageContext\r | |
179 | )\r | |
180 | {\r | |
181 | UpdatePeCoffPermissions (\r | |
182 | ImageContext,\r | |
183 | ArmClearMemoryRegionNoExec,\r | |
184 | ArmSetMemoryRegionReadOnly\r | |
185 | );\r | |
186 | }\r | |
187 | \r | |
188 | \r | |
189 | \r | |
190 | /**\r | |
191 | Performs additional actions just before a PE/COFF image is unloaded. Any resources\r | |
192 | that were allocated by PeCoffLoaderRelocateImageExtraAction() must be freed.\r | |
193 | \r | |
194 | If ImageContext is NULL, then ASSERT().\r | |
195 | \r | |
196 | @param ImageContext Pointer to the image context structure that describes the\r | |
197 | PE/COFF image that is being unloaded.\r | |
198 | \r | |
199 | **/\r | |
200 | VOID\r | |
201 | EFIAPI\r | |
202 | PeCoffLoaderUnloadImageExtraAction (\r | |
203 | IN OUT PE_COFF_LOADER_IMAGE_CONTEXT *ImageContext\r | |
204 | )\r | |
205 | {\r | |
206 | UpdatePeCoffPermissions (\r | |
207 | ImageContext,\r | |
208 | ArmSetMemoryRegionNoExec,\r | |
209 | ArmClearMemoryRegionReadOnly\r | |
210 | );\r | |
211 | }\r |