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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 | |
7 | This program and the accompanying materials\r | |
8 | are licensed and made available under the terms and conditions of the BSD License\r | |
9 | which accompanies this distribution. The full text of the license may be found at\r | |
10 | http://opensource.org/licenses/bsd-license.php\r | |
11 | \r | |
12 | THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r | |
13 | WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r | |
14 | \r | |
15 | **/\r | |
16 | \r | |
17 | #include <PiDxe.h>\r | |
18 | \r | |
19 | #include <Library/ArmMmuLib.h>\r | |
20 | #include <Library/BaseLib.h>\r | |
21 | #include <Library/BaseMemoryLib.h>\r | |
22 | #include <Library/DebugLib.h>\r | |
23 | #include <Library/PcdLib.h>\r | |
24 | #include <Library/PeCoffLib.h>\r | |
25 | #include <Library/PeCoffExtraActionLib.h>\r | |
26 | \r | |
27 | typedef RETURN_STATUS (*REGION_PERMISSION_UPDATE_FUNC) (\r | |
28 | IN EFI_PHYSICAL_ADDRESS BaseAddress,\r | |
29 | IN UINT64 Length\r | |
30 | );\r | |
31 | \r | |
32 | STATIC\r | |
33 | RETURN_STATUS\r | |
34 | UpdatePeCoffPermissions (\r | |
35 | IN CONST PE_COFF_LOADER_IMAGE_CONTEXT *ImageContext,\r | |
36 | IN REGION_PERMISSION_UPDATE_FUNC NoExecUpdater,\r | |
37 | IN REGION_PERMISSION_UPDATE_FUNC ReadOnlyUpdater\r | |
38 | )\r | |
39 | {\r | |
40 | RETURN_STATUS Status;\r | |
41 | EFI_IMAGE_OPTIONAL_HEADER_PTR_UNION Hdr;\r | |
42 | EFI_IMAGE_OPTIONAL_HEADER_UNION HdrData;\r | |
43 | UINTN Size;\r | |
44 | UINTN ReadSize;\r | |
45 | UINT32 SectionHeaderOffset;\r | |
46 | UINTN NumberOfSections;\r | |
47 | UINTN Index;\r | |
48 | EFI_IMAGE_SECTION_HEADER SectionHeader;\r | |
49 | PE_COFF_LOADER_IMAGE_CONTEXT TmpContext;\r | |
50 | EFI_PHYSICAL_ADDRESS Base;\r | |
51 | \r | |
52 | //\r | |
53 | // We need to copy ImageContext since PeCoffLoaderGetImageInfo ()\r | |
54 | // will mangle the ImageAddress field\r | |
55 | //\r | |
56 | CopyMem (&TmpContext, ImageContext, sizeof (TmpContext));\r | |
57 | \r | |
58 | if (TmpContext.PeCoffHeaderOffset == 0) {\r | |
59 | Status = PeCoffLoaderGetImageInfo (&TmpContext);\r | |
60 | if (RETURN_ERROR (Status)) {\r | |
61 | DEBUG ((DEBUG_ERROR,\r | |
62 | "%a: PeCoffLoaderGetImageInfo () failed (Status = %r)\n",\r | |
63 | __FUNCTION__, Status));\r | |
64 | return Status;\r | |
65 | }\r | |
66 | }\r | |
67 | \r | |
68 | if (TmpContext.IsTeImage &&\r | |
69 | TmpContext.ImageAddress == ImageContext->ImageAddress) {\r | |
70 | DEBUG ((DEBUG_INFO, "%a: ignoring XIP TE image at 0x%lx\n", __FUNCTION__,\r | |
71 | ImageContext->ImageAddress));\r | |
72 | return RETURN_SUCCESS;\r | |
73 | }\r | |
74 | \r | |
75 | if (TmpContext.SectionAlignment < EFI_PAGE_SIZE) {\r | |
76 | //\r | |
77 | // The sections need to be at least 4 KB aligned, since that is the\r | |
78 | // granularity at which we can tighten permissions. So just clear the\r | |
79 | // noexec permissions on the entire region.\r | |
80 | //\r | |
81 | if (!TmpContext.IsTeImage) {\r | |
82 | DEBUG ((DEBUG_WARN,\r | |
83 | "%a: non-TE Image at 0x%lx has SectionAlignment < 4 KB (%lu)\n",\r | |
84 | __FUNCTION__, ImageContext->ImageAddress, TmpContext.SectionAlignment));\r | |
85 | }\r | |
86 | Base = ImageContext->ImageAddress & ~(EFI_PAGE_SIZE - 1);\r | |
87 | Size = ImageContext->ImageAddress - Base + ImageContext->ImageSize;\r | |
88 | return NoExecUpdater (Base, ALIGN_VALUE (Size, EFI_PAGE_SIZE));\r | |
89 | }\r | |
90 | \r | |
91 | //\r | |
92 | // Read the PE/COFF Header. For PE32 (32-bit) this will read in too much\r | |
93 | // data, but that should not hurt anything. Hdr.Pe32->OptionalHeader.Magic\r | |
94 | // determines if this is a PE32 or PE32+ image. The magic is in the same\r | |
95 | // location in both images.\r | |
96 | //\r | |
97 | Hdr.Union = &HdrData;\r | |
98 | Size = sizeof (EFI_IMAGE_OPTIONAL_HEADER_UNION);\r | |
99 | ReadSize = Size;\r | |
100 | Status = TmpContext.ImageRead (TmpContext.Handle,\r | |
101 | TmpContext.PeCoffHeaderOffset, &Size, Hdr.Pe32);\r | |
102 | if (RETURN_ERROR (Status) || (Size != ReadSize)) {\r | |
103 | DEBUG ((DEBUG_ERROR,\r | |
104 | "%a: TmpContext.ImageRead () failed (Status = %r)\n",\r | |
105 | __FUNCTION__, Status));\r | |
106 | return Status;\r | |
107 | }\r | |
108 | \r | |
109 | ASSERT (Hdr.Pe32->Signature == EFI_IMAGE_NT_SIGNATURE);\r | |
110 | \r | |
111 | SectionHeaderOffset = TmpContext.PeCoffHeaderOffset + sizeof (UINT32) +\r | |
112 | sizeof (EFI_IMAGE_FILE_HEADER);\r | |
113 | NumberOfSections = (UINTN)(Hdr.Pe32->FileHeader.NumberOfSections);\r | |
114 | \r | |
115 | switch (Hdr.Pe32->OptionalHeader.Magic) {\r | |
116 | case EFI_IMAGE_NT_OPTIONAL_HDR32_MAGIC:\r | |
117 | SectionHeaderOffset += Hdr.Pe32->FileHeader.SizeOfOptionalHeader;\r | |
118 | break;\r | |
119 | case EFI_IMAGE_NT_OPTIONAL_HDR64_MAGIC:\r | |
120 | SectionHeaderOffset += Hdr.Pe32Plus->FileHeader.SizeOfOptionalHeader;\r | |
121 | break;\r | |
122 | default:\r | |
123 | ASSERT (FALSE);\r | |
124 | }\r | |
125 | \r | |
126 | //\r | |
127 | // Iterate over the sections\r | |
128 | //\r | |
129 | for (Index = 0; Index < NumberOfSections; Index++) {\r | |
130 | //\r | |
131 | // Read section header from file\r | |
132 | //\r | |
133 | Size = sizeof (EFI_IMAGE_SECTION_HEADER);\r | |
134 | ReadSize = Size;\r | |
135 | Status = TmpContext.ImageRead (TmpContext.Handle, SectionHeaderOffset,\r | |
136 | &Size, &SectionHeader);\r | |
137 | if (RETURN_ERROR (Status) || (Size != ReadSize)) {\r | |
138 | DEBUG ((DEBUG_ERROR,\r | |
139 | "%a: TmpContext.ImageRead () failed (Status = %r)\n",\r | |
140 | __FUNCTION__, Status));\r | |
141 | return Status;\r | |
142 | }\r | |
143 | \r | |
144 | Base = TmpContext.ImageAddress + SectionHeader.VirtualAddress;\r | |
145 | \r | |
146 | if ((SectionHeader.Characteristics & EFI_IMAGE_SCN_MEM_EXECUTE) == 0) {\r | |
147 | \r | |
77746e70 | 148 | if ((SectionHeader.Characteristics & EFI_IMAGE_SCN_MEM_WRITE) == 0) {\r |
f7f94ffe SG |
149 | \r |
150 | DEBUG ((DEBUG_INFO,\r | |
151 | "%a: Mapping section %d of image at 0x%lx with RO-XN permissions and size 0x%x\n",\r | |
152 | __FUNCTION__, Index, Base, SectionHeader.Misc.VirtualSize));\r | |
153 | ReadOnlyUpdater (Base, SectionHeader.Misc.VirtualSize);\r | |
154 | } else {\r | |
155 | DEBUG ((DEBUG_WARN,\r | |
156 | "%a: Mapping section %d of image at 0x%lx with RW-XN permissions and size 0x%x\n",\r | |
157 | __FUNCTION__, Index, Base, SectionHeader.Misc.VirtualSize));\r | |
158 | }\r | |
159 | } else {\r | |
f7f94ffe SG |
160 | DEBUG ((DEBUG_INFO,\r |
161 | "%a: Mapping section %d of image at 0x%lx with RO-X permissions and size 0x%x\n",\r | |
162 | __FUNCTION__, Index, Base, SectionHeader.Misc.VirtualSize));\r | |
77746e70 | 163 | ReadOnlyUpdater (Base, SectionHeader.Misc.VirtualSize);\r |
f7f94ffe SG |
164 | NoExecUpdater (Base, SectionHeader.Misc.VirtualSize);\r |
165 | }\r | |
166 | \r | |
167 | SectionHeaderOffset += sizeof (EFI_IMAGE_SECTION_HEADER);\r | |
168 | }\r | |
169 | return RETURN_SUCCESS;\r | |
170 | }\r | |
171 | \r | |
172 | /**\r | |
173 | Performs additional actions after a PE/COFF image has been loaded and relocated.\r | |
174 | \r | |
175 | If ImageContext is NULL, then ASSERT().\r | |
176 | \r | |
177 | @param ImageContext Pointer to the image context structure that describes the\r | |
178 | PE/COFF image that has already been loaded and relocated.\r | |
179 | \r | |
180 | **/\r | |
181 | VOID\r | |
182 | EFIAPI\r | |
183 | PeCoffLoaderRelocateImageExtraAction (\r | |
184 | IN OUT PE_COFF_LOADER_IMAGE_CONTEXT *ImageContext\r | |
185 | )\r | |
186 | {\r | |
187 | UpdatePeCoffPermissions (\r | |
188 | ImageContext,\r | |
189 | ArmClearMemoryRegionNoExec,\r | |
190 | ArmSetMemoryRegionReadOnly\r | |
191 | );\r | |
192 | }\r | |
193 | \r | |
194 | \r | |
195 | \r | |
196 | /**\r | |
197 | Performs additional actions just before a PE/COFF image is unloaded. Any resources\r | |
198 | that were allocated by PeCoffLoaderRelocateImageExtraAction() must be freed.\r | |
199 | \r | |
200 | If ImageContext is NULL, then ASSERT().\r | |
201 | \r | |
202 | @param ImageContext Pointer to the image context structure that describes the\r | |
203 | PE/COFF image that is being unloaded.\r | |
204 | \r | |
205 | **/\r | |
206 | VOID\r | |
207 | EFIAPI\r | |
208 | PeCoffLoaderUnloadImageExtraAction (\r | |
209 | IN OUT PE_COFF_LOADER_IMAGE_CONTEXT *ImageContext\r | |
210 | )\r | |
211 | {\r | |
212 | UpdatePeCoffPermissions (\r | |
213 | ImageContext,\r | |
214 | ArmSetMemoryRegionNoExec,\r | |
215 | ArmClearMemoryRegionReadOnly\r | |
216 | );\r | |
217 | }\r |