├── .gitignore ├── LICENSE ├── README.md ├── SelfRemappingCode.sln └── SelfRemappingCode ├── SelfRemappingCode.vcxproj ├── SelfRemappingCode.vcxproj.filters ├── log.h ├── main.cpp ├── ntdll.h ├── remap.cpp └── remap.h /.gitignore: -------------------------------------------------------------------------------- 1 | *.cache 2 | *.exp 3 | *.iobj 4 | *.ipdb 5 | *.lastbuildstate 6 | *.lib 7 | *.log 8 | *.metagen 9 | *.obj 10 | *.opensdf 11 | *.pch 12 | *.pdb 13 | *.res 14 | *.sdf 15 | *.suo 16 | *.tlog 17 | *.user 18 | 19 | .vs/* 20 | Debug/* 21 | Release/* 22 | bin/ 23 | ipch/* 24 | -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | GNU GENERAL PUBLIC LICENSE 2 | Version 3, 29 June 2007 3 | 4 | Copyright (C) 2007 Free Software Foundation, Inc. 5 | Everyone is permitted to copy and distribute verbatim copies 6 | of this license document, but changing it is not allowed. 7 | 8 | Preamble 9 | 10 | The GNU General Public License is a free, copyleft license for 11 | software and other kinds of works. 12 | 13 | The licenses for most software and other practical works are designed 14 | to take away your freedom to share and change the works. By contrast, 15 | the GNU General Public License is intended to guarantee your freedom to 16 | share and change all versions of a program--to make sure it remains free 17 | software for all its users. We, the Free Software Foundation, use the 18 | GNU General Public License for most of our software; it applies also to 19 | any other work released this way by its authors. You can apply it to 20 | your programs, too. 21 | 22 | When we speak of free software, we are referring to freedom, not 23 | price. Our General Public Licenses are designed to make sure that you 24 | have the freedom to distribute copies of free software (and charge for 25 | them if you wish), that you receive source code or can get it if you 26 | want it, that you can change the software or use pieces of it in new 27 | free programs, and that you know you can do these things. 28 | 29 | To protect your rights, we need to prevent others from denying you 30 | these rights or asking you to surrender the rights. Therefore, you have 31 | certain responsibilities if you distribute copies of the software, or if 32 | you modify it: responsibilities to respect the freedom of others. 33 | 34 | For example, if you distribute copies of such a program, whether 35 | gratis or for a fee, you must pass on to the recipients the same 36 | freedoms that you received. You must make sure that they, too, receive 37 | or can get the source code. And you must show them these terms so they 38 | know their rights. 39 | 40 | Developers that use the GNU GPL protect your rights with two steps: 41 | (1) assert copyright on the software, and (2) offer you this License 42 | giving you legal permission to copy, distribute and/or modify it. 43 | 44 | For the developers' and authors' protection, the GPL clearly explains 45 | that there is no warranty for this free software. For both users' and 46 | authors' sake, the GPL requires that modified versions be marked as 47 | changed, so that their problems will not be attributed erroneously to 48 | authors of previous versions. 49 | 50 | Some devices are designed to deny users access to install or run 51 | modified versions of the software inside them, although the manufacturer 52 | can do so. This is fundamentally incompatible with the aim of 53 | protecting users' freedom to change the software. The systematic 54 | pattern of such abuse occurs in the area of products for individuals to 55 | use, which is precisely where it is most unacceptable. Therefore, we 56 | have designed this version of the GPL to prohibit the practice for those 57 | products. If such problems arise substantially in other domains, we 58 | stand ready to extend this provision to those domains in future versions 59 | of the GPL, as needed to protect the freedom of users. 60 | 61 | Finally, every program is threatened constantly by software patents. 62 | States should not allow patents to restrict development and use of 63 | software on general-purpose computers, but in those that do, we wish to 64 | avoid the special danger that patents applied to a free program could 65 | make it effectively proprietary. To prevent this, the GPL assures that 66 | patents cannot be used to render the program non-free. 67 | 68 | The precise terms and conditions for copying, distribution and 69 | modification follow. 70 | 71 | TERMS AND CONDITIONS 72 | 73 | 0. Definitions. 74 | 75 | "This License" refers to version 3 of the GNU General Public License. 76 | 77 | "Copyright" also means copyright-like laws that apply to other kinds of 78 | works, such as semiconductor masks. 79 | 80 | "The Program" refers to any copyrightable work licensed under this 81 | License. Each licensee is addressed as "you". "Licensees" and 82 | "recipients" may be individuals or organizations. 83 | 84 | To "modify" a work means to copy from or adapt all or part of the work 85 | in a fashion requiring copyright permission, other than the making of an 86 | exact copy. The resulting work is called a "modified version" of the 87 | earlier work or a work "based on" the earlier work. 88 | 89 | A "covered work" means either the unmodified Program or a work based 90 | on the Program. 91 | 92 | To "propagate" a work means to do anything with it that, without 93 | permission, would make you directly or secondarily liable for 94 | infringement under applicable copyright law, except executing it on a 95 | computer or modifying a private copy. Propagation includes copying, 96 | distribution (with or without modification), making available to the 97 | public, and in some countries other activities as well. 98 | 99 | To "convey" a work means any kind of propagation that enables other 100 | parties to make or receive copies. Mere interaction with a user through 101 | a computer network, with no transfer of a copy, is not conveying. 102 | 103 | An interactive user interface displays "Appropriate Legal Notices" 104 | to the extent that it includes a convenient and prominently visible 105 | feature that (1) displays an appropriate copyright notice, and (2) 106 | tells the user that there is no warranty for the work (except to the 107 | extent that warranties are provided), that licensees may convey the 108 | work under this License, and how to view a copy of this License. If 109 | the interface presents a list of user commands or options, such as a 110 | menu, a prominent item in the list meets this criterion. 111 | 112 | 1. Source Code. 113 | 114 | The "source code" for a work means the preferred form of the work 115 | for making modifications to it. "Object code" means any non-source 116 | form of a work. 117 | 118 | A "Standard Interface" means an interface that either is an official 119 | standard defined by a recognized standards body, or, in the case of 120 | interfaces specified for a particular programming language, one that 121 | is widely used among developers working in that language. 122 | 123 | The "System Libraries" of an executable work include anything, other 124 | than the work as a whole, that (a) is included in the normal form of 125 | packaging a Major Component, but which is not part of that Major 126 | Component, and (b) serves only to enable use of the work with that 127 | Major Component, or to implement a Standard Interface for which an 128 | implementation is available to the public in source code form. A 129 | "Major Component", in this context, means a major essential component 130 | (kernel, window system, and so on) of the specific operating system 131 | (if any) on which the executable work runs, or a compiler used to 132 | produce the work, or an object code interpreter used to run it. 133 | 134 | The "Corresponding Source" for a work in object code form means all 135 | the source code needed to generate, install, and (for an executable 136 | work) run the object code and to modify the work, including scripts to 137 | control those activities. However, it does not include the work's 138 | System Libraries, or general-purpose tools or generally available free 139 | programs which are used unmodified in performing those activities but 140 | which are not part of the work. For example, Corresponding Source 141 | includes interface definition files associated with source files for 142 | the work, and the source code for shared libraries and dynamically 143 | linked subprograms that the work is specifically designed to require, 144 | such as by intimate data communication or control flow between those 145 | subprograms and other parts of the work. 146 | 147 | The Corresponding Source need not include anything that users 148 | can regenerate automatically from other parts of the Corresponding 149 | Source. 150 | 151 | The Corresponding Source for a work in source code form is that 152 | same work. 153 | 154 | 2. Basic Permissions. 155 | 156 | All rights granted under this License are granted for the term of 157 | copyright on the Program, and are irrevocable provided the stated 158 | conditions are met. This License explicitly affirms your unlimited 159 | permission to run the unmodified Program. The output from running a 160 | covered work is covered by this License only if the output, given its 161 | content, constitutes a covered work. This License acknowledges your 162 | rights of fair use or other equivalent, as provided by copyright law. 163 | 164 | You may make, run and propagate covered works that you do not 165 | convey, without conditions so long as your license otherwise remains 166 | in force. You may convey covered works to others for the sole purpose 167 | of having them make modifications exclusively for you, or provide you 168 | with facilities for running those works, provided that you comply with 169 | the terms of this License in conveying all material for which you do 170 | not control copyright. Those thus making or running the covered works 171 | for you must do so exclusively on your behalf, under your direction 172 | and control, on terms that prohibit them from making any copies of 173 | your copyrighted material outside their relationship with you. 174 | 175 | Conveying under any other circumstances is permitted solely under 176 | the conditions stated below. Sublicensing is not allowed; section 10 177 | makes it unnecessary. 178 | 179 | 3. Protecting Users' Legal Rights From Anti-Circumvention Law. 180 | 181 | No covered work shall be deemed part of an effective technological 182 | measure under any applicable law fulfilling obligations under article 183 | 11 of the WIPO copyright treaty adopted on 20 December 1996, or 184 | similar laws prohibiting or restricting circumvention of such 185 | measures. 186 | 187 | When you convey a covered work, you waive any legal power to forbid 188 | circumvention of technological measures to the extent such circumvention 189 | is effected by exercising rights under this License with respect to 190 | the covered work, and you disclaim any intention to limit operation or 191 | modification of the work as a means of enforcing, against the work's 192 | users, your or third parties' legal rights to forbid circumvention of 193 | technological measures. 194 | 195 | 4. Conveying Verbatim Copies. 196 | 197 | You may convey verbatim copies of the Program's source code as you 198 | receive it, in any medium, provided that you conspicuously and 199 | appropriately publish on each copy an appropriate copyright notice; 200 | keep intact all notices stating that this License and any 201 | non-permissive terms added in accord with section 7 apply to the code; 202 | keep intact all notices of the absence of any warranty; and give all 203 | recipients a copy of this License along with the Program. 204 | 205 | You may charge any price or no price for each copy that you convey, 206 | and you may offer support or warranty protection for a fee. 207 | 208 | 5. Conveying Modified Source Versions. 209 | 210 | You may convey a work based on the Program, or the modifications to 211 | produce it from the Program, in the form of source code under the 212 | terms of section 4, provided that you also meet all of these conditions: 213 | 214 | a) The work must carry prominent notices stating that you modified 215 | it, and giving a relevant date. 216 | 217 | b) The work must carry prominent notices stating that it is 218 | released under this License and any conditions added under section 219 | 7. This requirement modifies the requirement in section 4 to 220 | "keep intact all notices". 221 | 222 | c) You must license the entire work, as a whole, under this 223 | License to anyone who comes into possession of a copy. This 224 | License will therefore apply, along with any applicable section 7 225 | additional terms, to the whole of the work, and all its parts, 226 | regardless of how they are packaged. This License gives no 227 | permission to license the work in any other way, but it does not 228 | invalidate such permission if you have separately received it. 229 | 230 | d) If the work has interactive user interfaces, each must display 231 | Appropriate Legal Notices; however, if the Program has interactive 232 | interfaces that do not display Appropriate Legal Notices, your 233 | work need not make them do so. 234 | 235 | A compilation of a covered work with other separate and independent 236 | works, which are not by their nature extensions of the covered work, 237 | and which are not combined with it such as to form a larger program, 238 | in or on a volume of a storage or distribution medium, is called an 239 | "aggregate" if the compilation and its resulting copyright are not 240 | used to limit the access or legal rights of the compilation's users 241 | beyond what the individual works permit. Inclusion of a covered work 242 | in an aggregate does not cause this License to apply to the other 243 | parts of the aggregate. 244 | 245 | 6. Conveying Non-Source Forms. 246 | 247 | You may convey a covered work in object code form under the terms 248 | of sections 4 and 5, provided that you also convey the 249 | machine-readable Corresponding Source under the terms of this License, 250 | in one of these ways: 251 | 252 | a) Convey the object code in, or embodied in, a physical product 253 | (including a physical distribution medium), accompanied by the 254 | Corresponding Source fixed on a durable physical medium 255 | customarily used for software interchange. 256 | 257 | b) Convey the object code in, or embodied in, a physical product 258 | (including a physical distribution medium), accompanied by a 259 | written offer, valid for at least three years and valid for as 260 | long as you offer spare parts or customer support for that product 261 | model, to give anyone who possesses the object code either (1) a 262 | copy of the Corresponding Source for all the software in the 263 | product that is covered by this License, on a durable physical 264 | medium customarily used for software interchange, for a price no 265 | more than your reasonable cost of physically performing this 266 | conveying of source, or (2) access to copy the 267 | Corresponding Source from a network server at no charge. 268 | 269 | c) Convey individual copies of the object code with a copy of the 270 | written offer to provide the Corresponding Source. This 271 | alternative is allowed only occasionally and noncommercially, and 272 | only if you received the object code with such an offer, in accord 273 | with subsection 6b. 274 | 275 | d) Convey the object code by offering access from a designated 276 | place (gratis or for a charge), and offer equivalent access to the 277 | Corresponding Source in the same way through the same place at no 278 | further charge. You need not require recipients to copy the 279 | Corresponding Source along with the object code. If the place to 280 | copy the object code is a network server, the Corresponding Source 281 | may be on a different server (operated by you or a third party) 282 | that supports equivalent copying facilities, provided you maintain 283 | clear directions next to the object code saying where to find the 284 | Corresponding Source. Regardless of what server hosts the 285 | Corresponding Source, you remain obligated to ensure that it is 286 | available for as long as needed to satisfy these requirements. 287 | 288 | e) Convey the object code using peer-to-peer transmission, provided 289 | you inform other peers where the object code and Corresponding 290 | Source of the work are being offered to the general public at no 291 | charge under subsection 6d. 292 | 293 | A separable portion of the object code, whose source code is excluded 294 | from the Corresponding Source as a System Library, need not be 295 | included in conveying the object code work. 296 | 297 | A "User Product" is either (1) a "consumer product", which means any 298 | tangible personal property which is normally used for personal, family, 299 | or household purposes, or (2) anything designed or sold for incorporation 300 | into a dwelling. In determining whether a product is a consumer product, 301 | doubtful cases shall be resolved in favor of coverage. For a particular 302 | product received by a particular user, "normally used" refers to a 303 | typical or common use of that class of product, regardless of the status 304 | of the particular user or of the way in which the particular user 305 | actually uses, or expects or is expected to use, the product. A product 306 | is a consumer product regardless of whether the product has substantial 307 | commercial, industrial or non-consumer uses, unless such uses represent 308 | the only significant mode of use of the product. 309 | 310 | "Installation Information" for a User Product means any methods, 311 | procedures, authorization keys, or other information required to install 312 | and execute modified versions of a covered work in that User Product from 313 | a modified version of its Corresponding Source. The information must 314 | suffice to ensure that the continued functioning of the modified object 315 | code is in no case prevented or interfered with solely because 316 | modification has been made. 317 | 318 | If you convey an object code work under this section in, or with, or 319 | specifically for use in, a User Product, and the conveying occurs as 320 | part of a transaction in which the right of possession and use of the 321 | User Product is transferred to the recipient in perpetuity or for a 322 | fixed term (regardless of how the transaction is characterized), the 323 | Corresponding Source conveyed under this section must be accompanied 324 | by the Installation Information. But this requirement does not apply 325 | if neither you nor any third party retains the ability to install 326 | modified object code on the User Product (for example, the work has 327 | been installed in ROM). 328 | 329 | The requirement to provide Installation Information does not include a 330 | requirement to continue to provide support service, warranty, or updates 331 | for a work that has been modified or installed by the recipient, or for 332 | the User Product in which it has been modified or installed. Access to a 333 | network may be denied when the modification itself materially and 334 | adversely affects the operation of the network or violates the rules and 335 | protocols for communication across the network. 336 | 337 | Corresponding Source conveyed, and Installation Information provided, 338 | in accord with this section must be in a format that is publicly 339 | documented (and with an implementation available to the public in 340 | source code form), and must require no special password or key for 341 | unpacking, reading or copying. 342 | 343 | 7. Additional Terms. 344 | 345 | "Additional permissions" are terms that supplement the terms of this 346 | License by making exceptions from one or more of its conditions. 347 | Additional permissions that are applicable to the entire Program shall 348 | be treated as though they were included in this License, to the extent 349 | that they are valid under applicable law. If additional permissions 350 | apply only to part of the Program, that part may be used separately 351 | under those permissions, but the entire Program remains governed by 352 | this License without regard to the additional permissions. 353 | 354 | When you convey a copy of a covered work, you may at your option 355 | remove any additional permissions from that copy, or from any part of 356 | it. (Additional permissions may be written to require their own 357 | removal in certain cases when you modify the work.) You may place 358 | additional permissions on material, added by you to a covered work, 359 | for which you have or can give appropriate copyright permission. 360 | 361 | Notwithstanding any other provision of this License, for material you 362 | add to a covered work, you may (if authorized by the copyright holders of 363 | that material) supplement the terms of this License with terms: 364 | 365 | a) Disclaiming warranty or limiting liability differently from the 366 | terms of sections 15 and 16 of this License; or 367 | 368 | b) Requiring preservation of specified reasonable legal notices or 369 | author attributions in that material or in the Appropriate Legal 370 | Notices displayed by works containing it; or 371 | 372 | c) Prohibiting misrepresentation of the origin of that material, or 373 | requiring that modified versions of such material be marked in 374 | reasonable ways as different from the original version; or 375 | 376 | d) Limiting the use for publicity purposes of names of licensors or 377 | authors of the material; or 378 | 379 | e) Declining to grant rights under trademark law for use of some 380 | trade names, trademarks, or service marks; or 381 | 382 | f) Requiring indemnification of licensors and authors of that 383 | material by anyone who conveys the material (or modified versions of 384 | it) with contractual assumptions of liability to the recipient, for 385 | any liability that these contractual assumptions directly impose on 386 | those licensors and authors. 387 | 388 | All other non-permissive additional terms are considered "further 389 | restrictions" within the meaning of section 10. If the Program as you 390 | received it, or any part of it, contains a notice stating that it is 391 | governed by this License along with a term that is a further 392 | restriction, you may remove that term. If a license document contains 393 | a further restriction but permits relicensing or conveying under this 394 | License, you may add to a covered work material governed by the terms 395 | of that license document, provided that the further restriction does 396 | not survive such relicensing or conveying. 397 | 398 | If you add terms to a covered work in accord with this section, you 399 | must place, in the relevant source files, a statement of the 400 | additional terms that apply to those files, or a notice indicating 401 | where to find the applicable terms. 402 | 403 | Additional terms, permissive or non-permissive, may be stated in the 404 | form of a separately written license, or stated as exceptions; 405 | the above requirements apply either way. 406 | 407 | 8. Termination. 408 | 409 | You may not propagate or modify a covered work except as expressly 410 | provided under this License. Any attempt otherwise to propagate or 411 | modify it is void, and will automatically terminate your rights under 412 | this License (including any patent licenses granted under the third 413 | paragraph of section 11). 414 | 415 | However, if you cease all violation of this License, then your 416 | license from a particular copyright holder is reinstated (a) 417 | provisionally, unless and until the copyright holder explicitly and 418 | finally terminates your license, and (b) permanently, if the copyright 419 | holder fails to notify you of the violation by some reasonable means 420 | prior to 60 days after the cessation. 421 | 422 | Moreover, your license from a particular copyright holder is 423 | reinstated permanently if the copyright holder notifies you of the 424 | violation by some reasonable means, this is the first time you have 425 | received notice of violation of this License (for any work) from that 426 | copyright holder, and you cure the violation prior to 30 days after 427 | your receipt of the notice. 428 | 429 | Termination of your rights under this section does not terminate the 430 | licenses of parties who have received copies or rights from you under 431 | this License. If your rights have been terminated and not permanently 432 | reinstated, you do not qualify to receive new licenses for the same 433 | material under section 10. 434 | 435 | 9. Acceptance Not Required for Having Copies. 436 | 437 | You are not required to accept this License in order to receive or 438 | run a copy of the Program. Ancillary propagation of a covered work 439 | occurring solely as a consequence of using peer-to-peer transmission 440 | to receive a copy likewise does not require acceptance. However, 441 | nothing other than this License grants you permission to propagate or 442 | modify any covered work. These actions infringe copyright if you do 443 | not accept this License. Therefore, by modifying or propagating a 444 | covered work, you indicate your acceptance of this License to do so. 445 | 446 | 10. Automatic Licensing of Downstream Recipients. 447 | 448 | Each time you convey a covered work, the recipient automatically 449 | receives a license from the original licensors, to run, modify and 450 | propagate that work, subject to this License. You are not responsible 451 | for enforcing compliance by third parties with this License. 452 | 453 | An "entity transaction" is a transaction transferring control of an 454 | organization, or substantially all assets of one, or subdividing an 455 | organization, or merging organizations. If propagation of a covered 456 | work results from an entity transaction, each party to that 457 | transaction who receives a copy of the work also receives whatever 458 | licenses to the work the party's predecessor in interest had or could 459 | give under the previous paragraph, plus a right to possession of the 460 | Corresponding Source of the work from the predecessor in interest, if 461 | the predecessor has it or can get it with reasonable efforts. 462 | 463 | You may not impose any further restrictions on the exercise of the 464 | rights granted or affirmed under this License. For example, you may 465 | not impose a license fee, royalty, or other charge for exercise of 466 | rights granted under this License, and you may not initiate litigation 467 | (including a cross-claim or counterclaim in a lawsuit) alleging that 468 | any patent claim is infringed by making, using, selling, offering for 469 | sale, or importing the Program or any portion of it. 470 | 471 | 11. Patents. 472 | 473 | A "contributor" is a copyright holder who authorizes use under this 474 | License of the Program or a work on which the Program is based. The 475 | work thus licensed is called the contributor's "contributor version". 476 | 477 | A contributor's "essential patent claims" are all patent claims 478 | owned or controlled by the contributor, whether already acquired or 479 | hereafter acquired, that would be infringed by some manner, permitted 480 | by this License, of making, using, or selling its contributor version, 481 | but do not include claims that would be infringed only as a 482 | consequence of further modification of the contributor version. For 483 | purposes of this definition, "control" includes the right to grant 484 | patent sublicenses in a manner consistent with the requirements of 485 | this License. 486 | 487 | Each contributor grants you a non-exclusive, worldwide, royalty-free 488 | patent license under the contributor's essential patent claims, to 489 | make, use, sell, offer for sale, import and otherwise run, modify and 490 | propagate the contents of its contributor version. 491 | 492 | In the following three paragraphs, a "patent license" is any express 493 | agreement or commitment, however denominated, not to enforce a patent 494 | (such as an express permission to practice a patent or covenant not to 495 | sue for patent infringement). To "grant" such a patent license to a 496 | party means to make such an agreement or commitment not to enforce a 497 | patent against the party. 498 | 499 | If you convey a covered work, knowingly relying on a patent license, 500 | and the Corresponding Source of the work is not available for anyone 501 | to copy, free of charge and under the terms of this License, through a 502 | publicly available network server or other readily accessible means, 503 | then you must either (1) cause the Corresponding Source to be so 504 | available, or (2) arrange to deprive yourself of the benefit of the 505 | patent license for this particular work, or (3) arrange, in a manner 506 | consistent with the requirements of this License, to extend the patent 507 | license to downstream recipients. "Knowingly relying" means you have 508 | actual knowledge that, but for the patent license, your conveying the 509 | covered work in a country, or your recipient's use of the covered work 510 | in a country, would infringe one or more identifiable patents in that 511 | country that you have reason to believe are valid. 512 | 513 | If, pursuant to or in connection with a single transaction or 514 | arrangement, you convey, or propagate by procuring conveyance of, a 515 | covered work, and grant a patent license to some of the parties 516 | receiving the covered work authorizing them to use, propagate, modify 517 | or convey a specific copy of the covered work, then the patent license 518 | you grant is automatically extended to all recipients of the covered 519 | work and works based on it. 520 | 521 | A patent license is "discriminatory" if it does not include within 522 | the scope of its coverage, prohibits the exercise of, or is 523 | conditioned on the non-exercise of one or more of the rights that are 524 | specifically granted under this License. You may not convey a covered 525 | work if you are a party to an arrangement with a third party that is 526 | in the business of distributing software, under which you make payment 527 | to the third party based on the extent of your activity of conveying 528 | the work, and under which the third party grants, to any of the 529 | parties who would receive the covered work from you, a discriminatory 530 | patent license (a) in connection with copies of the covered work 531 | conveyed by you (or copies made from those copies), or (b) primarily 532 | for and in connection with specific products or compilations that 533 | contain the covered work, unless you entered into that arrangement, 534 | or that patent license was granted, prior to 28 March 2007. 535 | 536 | Nothing in this License shall be construed as excluding or limiting 537 | any implied license or other defenses to infringement that may 538 | otherwise be available to you under applicable patent law. 539 | 540 | 12. No Surrender of Others' Freedom. 541 | 542 | If conditions are imposed on you (whether by court order, agreement or 543 | otherwise) that contradict the conditions of this License, they do not 544 | excuse you from the conditions of this License. If you cannot convey a 545 | covered work so as to satisfy simultaneously your obligations under this 546 | License and any other pertinent obligations, then as a consequence you may 547 | not convey it at all. For example, if you agree to terms that obligate you 548 | to collect a royalty for further conveying from those to whom you convey 549 | the Program, the only way you could satisfy both those terms and this 550 | License would be to refrain entirely from conveying the Program. 551 | 552 | 13. Use with the GNU Affero General Public License. 553 | 554 | Notwithstanding any other provision of this License, you have 555 | permission to link or combine any covered work with a work licensed 556 | under version 3 of the GNU Affero General Public License into a single 557 | combined work, and to convey the resulting work. The terms of this 558 | License will continue to apply to the part which is the covered work, 559 | but the special requirements of the GNU Affero General Public License, 560 | section 13, concerning interaction through a network will apply to the 561 | combination as such. 562 | 563 | 14. Revised Versions of this License. 564 | 565 | The Free Software Foundation may publish revised and/or new versions of 566 | the GNU General Public License from time to time. Such new versions will 567 | be similar in spirit to the present version, but may differ in detail to 568 | address new problems or concerns. 569 | 570 | Each version is given a distinguishing version number. If the 571 | Program specifies that a certain numbered version of the GNU General 572 | Public License "or any later version" applies to it, you have the 573 | option of following the terms and conditions either of that numbered 574 | version or of any later version published by the Free Software 575 | Foundation. If the Program does not specify a version number of the 576 | GNU General Public License, you may choose any version ever published 577 | by the Free Software Foundation. 578 | 579 | If the Program specifies that a proxy can decide which future 580 | versions of the GNU General Public License can be used, that proxy's 581 | public statement of acceptance of a version permanently authorizes you 582 | to choose that version for the Program. 583 | 584 | Later license versions may give you additional or different 585 | permissions. However, no additional obligations are imposed on any 586 | author or copyright holder as a result of your choosing to follow a 587 | later version. 588 | 589 | 15. Disclaimer of Warranty. 590 | 591 | THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY 592 | APPLICABLE LAW. EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT 593 | HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY 594 | OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, 595 | THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 596 | PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM 597 | IS WITH YOU. SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF 598 | ALL NECESSARY SERVICING, REPAIR OR CORRECTION. 599 | 600 | 16. Limitation of Liability. 601 | 602 | IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING 603 | WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS 604 | THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY 605 | GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE 606 | USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF 607 | DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD 608 | PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS), 609 | EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF 610 | SUCH DAMAGES. 611 | 612 | 17. Interpretation of Sections 15 and 16. 613 | 614 | If the disclaimer of warranty and limitation of liability provided 615 | above cannot be given local legal effect according to their terms, 616 | reviewing courts shall apply local law that most closely approximates 617 | an absolute waiver of all civil liability in connection with the 618 | Program, unless a warranty or assumption of liability accompanies a 619 | copy of the Program in return for a fee. 620 | 621 | END OF TERMS AND CONDITIONS 622 | 623 | How to Apply These Terms to Your New Programs 624 | 625 | If you develop a new program, and you want it to be of the greatest 626 | possible use to the public, the best way to achieve this is to make it 627 | free software which everyone can redistribute and change under these terms. 628 | 629 | To do so, attach the following notices to the program. It is safest 630 | to attach them to the start of each source file to most effectively 631 | state the exclusion of warranty; and each file should have at least 632 | the "copyright" line and a pointer to where the full notice is found. 633 | 634 | {one line to give the program's name and a brief idea of what it does.} 635 | Copyright (C) {year} {name of author} 636 | 637 | This program is free software: you can redistribute it and/or modify 638 | it under the terms of the GNU General Public License as published by 639 | the Free Software Foundation, either version 3 of the License, or 640 | (at your option) any later version. 641 | 642 | This program is distributed in the hope that it will be useful, 643 | but WITHOUT ANY WARRANTY; without even the implied warranty of 644 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 645 | GNU General Public License for more details. 646 | 647 | You should have received a copy of the GNU General Public License 648 | along with this program. If not, see . 649 | 650 | Also add information on how to contact you by electronic and paper mail. 651 | 652 | If the program does terminal interaction, make it output a short 653 | notice like this when it starts in an interactive mode: 654 | 655 | {project} Copyright (C) {year} {fullname} 656 | This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'. 657 | This is free software, and you are welcome to redistribute it 658 | under certain conditions; type `show c' for details. 659 | 660 | The hypothetical commands `show w' and `show c' should show the appropriate 661 | parts of the General Public License. Of course, your program's commands 662 | might be different; for a GUI interface, you would use an "about box". 663 | 664 | You should also get your employer (if you work as a programmer) or school, 665 | if any, to sign a "copyright disclaimer" for the program, if necessary. 666 | For more information on this, and how to apply and follow the GNU GPL, see 667 | . 668 | 669 | The GNU General Public License does not permit incorporating your program 670 | into proprietary programs. If your program is a subroutine library, you 671 | may consider it more useful to permit linking proprietary applications with 672 | the library. If this is what you want to do, use the GNU Lesser General 673 | Public License instead of this License. But first, please read 674 | . 675 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # Self-Remapping Code 2 | 3 | ## Summary 4 | 5 | This program remaps its image to prevent the page protection of pages contained in the image from being modified via NtProtectVirtualMemory. 6 | 7 | ## Motivation 8 | 9 | This technique can be utilized as an anti-debugging and anti-dumping mechanism. 10 | 11 | ## Implementation 12 | 13 | The remapping technique uses the following strategy: 14 | 15 | 1. The image is copied to an executable buffer referred to as the 'remap 16 | region'. 17 | 18 | 2. The remap routine inside the remap region is located and invoked. 19 | 20 | 3. The remap routine creates a page-file-backed section to store the 21 | remapped image. 22 | 23 | 4. The remap routine maps a view of the entire section and copies the 24 | contents of the image to the view. This view is then unmapped. 25 | 26 | 5. The remap routine maps a view for each pe section in the image using the 27 | relative virtual address of the pe section as the section offset for 28 | the view. Each view is mapped using the 'SEC_NO_CHANGE' allocation 29 | type to prevent page protection changes. 30 | 31 | 6. The remap routine completes and execution returns to the remapped image. 32 | 33 | The following tables are examples of the memory layout of an image before and after it has been remapped using this technique: 34 | 35 | ##### Before 36 | 37 | 
38 | Address          Size             Info                          Type   Protect  Initial
39 | =======================================================================================
40 | 0000000140000000 0000000000001000 selfremappingcode.exe         IMG    -R---    ERWC-
41 | 0000000140001000 000000000000F000 Reserved (0000000140000000)   IMG             ERWC-
42 | 0000000140010000 0000000000002000  ".text"                      IMG    ER---    ERWC-
43 | 0000000140012000 000000000000E000 Reserved (0000000140000000)   IMG             ERWC-
44 | 0000000140020000 0000000000002000  ".rdata"                     IMG    -R---    ERWC-
45 | 0000000140022000 000000000000E000 Reserved (0000000140000000)   IMG             ERWC-
46 | 0000000140030000 0000000000001000  ".data"                      IMG    -RW--    ERWC-
47 | 0000000140031000 000000000000F000 Reserved (0000000140000000)   IMG             ERWC-
48 | 0000000140040000 0000000000001000  ".pdata"                     IMG    -R---    ERWC-
49 | 0000000140041000 000000000000F000 Reserved (0000000140000000)   IMG             ERWC-
50 | 0000000140050000 0000000000001000  ".rsrc"                      IMG    -R---    ERWC-
51 | 0000000140051000 000000000000F000 Reserved (0000000140000000)   IMG             ERWC-
52 |
53 | 54 | ##### After 55 | 56 | 
57 | Address          Size             Info                          Type   Protect  Initial
58 | =======================================================================================
59 | 0000000140000000 0000000000001000                               MAP    -R---    -R---
60 | 0000000140010000 0000000000002000                               MAP    ER---    ER---
61 | 0000000140020000 0000000000002000                               MAP    -R---    -R---
62 | 0000000140030000 0000000000001000                               MAP    -RW--    -RW--
63 | 0000000140040000 0000000000001000                               MAP    -R---    -R---
64 | 0000000140050000 0000000000001000                               MAP    -R---    -R---
65 |
66 | 67 | ## Requirements 68 | 69 | - Each pe section in the image must be aligned to the system allocation granularity. This program uses the `/ALIGN` linker option to achieve this alignment. 70 | -------------------------------------------------------------------------------- /SelfRemappingCode.sln: -------------------------------------------------------------------------------- 1 |  2 | Microsoft Visual Studio Solution File, Format Version 12.00 3 | # Visual Studio 15 4 | VisualStudioVersion = 15.0.28307.271 5 | MinimumVisualStudioVersion = 10.0.40219.1 6 | Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "SelfRemappingCode", "SelfRemappingCode\SelfRemappingCode.vcxproj", "{DD489B61-95B8-48A2-A031-56AC76CE6350}" 7 | EndProject 8 | Global 9 | GlobalSection(SolutionConfigurationPlatforms) = preSolution 10 | Release|x64 = Release|x64 11 | EndGlobalSection 12 | GlobalSection(ProjectConfigurationPlatforms) = postSolution 13 | {DD489B61-95B8-48A2-A031-56AC76CE6350}.Release|x64.ActiveCfg = Release|x64 14 | {DD489B61-95B8-48A2-A031-56AC76CE6350}.Release|x64.Build.0 = Release|x64 15 | EndGlobalSection 16 | GlobalSection(SolutionProperties) = preSolution 17 | HideSolutionNode = FALSE 18 | EndGlobalSection 19 | GlobalSection(ExtensibilityGlobals) = postSolution 20 | SolutionGuid = {B8457C47-1D8F-4B5B-8C65-096BC521C441} 21 | EndGlobalSection 22 | EndGlobal 23 | -------------------------------------------------------------------------------- /SelfRemappingCode/SelfRemappingCode.vcxproj: -------------------------------------------------------------------------------- 1 |  2 | 3 | 4 | 5 | Release 6 | x64 7 | 8 | 9 | 10 | {DD489B61-95B8-48A2-A031-56AC76CE6350} 11 | SelfRemappingCode 12 | 10.0.17763.0 13 | SelfRemappingCode 14 | 15 | 16 | 17 | Application 18 | false 19 | v141 20 | true 21 | MultiByte 22 | false 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | 32 | false 33 | $(ProjectName) 34 | $(SolutionDir)bin\$(Platform)\$(Configuration)\ 35 | 36 | 37 | 38 | Level4 39 | NotUsing 40 | Disabled 41 | true 42 | true 43 | NDEBUG;_CONSOLE;%(PreprocessorDefinitions) 44 | true 45 | 4477; 46 | 47 | 48 | Console 49 | true 50 | true 51 | true 52 | ntdll.lib;kernel32.lib;user32.lib;gdi32.lib;winspool.lib;comdlg32.lib;advapi32.lib;shell32.lib;ole32.lib;oleaut32.lib;uuid.lib;odbc32.lib;odbccp32.lib;%(AdditionalDependencies) 53 | 54 | 55 | 56 | 57 | 58 | 59 | 60 | 61 | 62 | 63 | 64 | 65 | 66 | 67 | -------------------------------------------------------------------------------- /SelfRemappingCode/SelfRemappingCode.vcxproj.filters: -------------------------------------------------------------------------------- 1 |  2 | 3 | 4 | 5 | Source Files 6 | 7 | 8 | Source Files 9 | 10 | 11 | 12 | 13 | Header Files 14 | 15 | 16 | Header Files 17 | 18 | 19 | Header Files 20 | 21 | 22 | 23 | 24 | {505123a2-0e40-4ec4-a758-438c89d9685a} 25 | 26 | 27 | {04422d4f-c1dc-4349-af77-a917868962e6} 28 | 29 | 30 | -------------------------------------------------------------------------------- /SelfRemappingCode/log.h: -------------------------------------------------------------------------------- 1 | #pragma once 2 | 3 | #include 4 | 5 | #include 6 | 7 | //============================================================================= 8 | // Public Interface 9 | //============================================================================= 10 | #define DBG_PRINT printf 11 | #define INF_PRINT printf 12 | #define WRN_PRINT printf 13 | #define ERR_PRINT printf 14 | -------------------------------------------------------------------------------- /SelfRemappingCode/main.cpp: -------------------------------------------------------------------------------- 1 | #include 2 | 3 | #include "log.h" 4 | #include "remap.h" 5 | 6 | 7 | // 8 | // This linker option forces every pe section to be loaded at an address which 9 | // is aligned to the system allocation granularity. At runtime, each section 10 | // is padded with pages of reserved memory. 11 | // 12 | // NOTE This option does not affect file size. 13 | // 14 | #pragma comment(linker, "/ALIGN:0x10000") 15 | 16 | 17 | // 18 | // main 19 | // 20 | int 21 | main( 22 | int argc, 23 | char* argv[] 24 | ) 25 | { 26 | ULONG_PTR ImageBase = 0; 27 | int mainstatus = EXIT_SUCCESS; 28 | 29 | UNREFERENCED_PARAMETER(argc); 30 | UNREFERENCED_PARAMETER(argv); 31 | 32 | ImageBase = (ULONG_PTR)GetModuleHandleW(NULL); 33 | if (!ImageBase) 34 | { 35 | ERR_PRINT("GetModuleHandleW failed: %u\n", GetLastError()); 36 | mainstatus = EXIT_FAILURE; 37 | goto exit; 38 | } 39 | 40 | if (!RmpRemapImage(ImageBase)) 41 | { 42 | ERR_PRINT("RmpRemapImage failed.\n"); 43 | mainstatus = EXIT_FAILURE; 44 | goto exit; 45 | } 46 | 47 | exit: 48 | return mainstatus; 49 | } 50 | -------------------------------------------------------------------------------- /SelfRemappingCode/ntdll.h: -------------------------------------------------------------------------------- 1 | #pragma once 2 | 3 | #include 4 | 5 | #ifndef _NTDEF_ 6 | typedef _Return_type_success_(return >= 0) LONG NTSTATUS; 7 | #endif 8 | 9 | 10 | #define NT_SUCCESS(Status) ((NTSTATUS)(Status) >= 0) 11 | 12 | #define STATUS_SUCCESS ((NTSTATUS)0x00000000L) 13 | #define STATUS_INVALID_PAGE_PROTECTION ((NTSTATUS)0xC0000045L) 14 | #define STATUS_PROCEDURE_NOT_FOUND ((NTSTATUS)0xC000007AL) 15 | 16 | #define SEC_NO_CHANGE 0x00400000 17 | 18 | #define PAGE_SIZE 0x1000 19 | #define POINTER_IS_ALIGNED(Pointer, Alignment) \ 20 | (((((ULONG_PTR)(Pointer)) & (((Alignment)-1))) == 0) ? TRUE : FALSE) 21 | 22 | #define NtCurrentProcess() ((HANDLE)(LONG_PTR)-1) 23 | 24 | 25 | typedef struct _UNICODE_STRING 26 | { 27 | USHORT Length; 28 | USHORT MaximumLength; 29 | PWSTR Buffer; 30 | } UNICODE_STRING, *PUNICODE_STRING; 31 | 32 | typedef struct _OBJECT_ATTRIBUTES 33 | { 34 | ULONG Length; 35 | HANDLE RootDirectory; 36 | PUNICODE_STRING ObjectName; 37 | ULONG Attributes; 38 | PVOID SecurityDescriptor; 39 | PVOID SecurityQualityOfService; 40 | } OBJECT_ATTRIBUTES, *POBJECT_ATTRIBUTES; 41 | 42 | typedef enum _SECTION_INHERIT 43 | { 44 | ViewShare = 1, 45 | ViewUnmap = 2 46 | } SECTION_INHERIT, *PSECTION_INHERIT; 47 | 48 | typedef enum _MEMORY_INFORMATION_CLASS 49 | { 50 | MemoryBasicInformation 51 | } MEMORY_INFORMATION_CLASS, *PMEMORY_INFORMATION_CLASS; 52 | 53 | 54 | EXTERN_C 55 | NTSTATUS 56 | NTAPI 57 | NtCreateSection( 58 | _Out_ PHANDLE SectionHandle, 59 | _In_ ACCESS_MASK DesiredAccess, 60 | _In_opt_ POBJECT_ATTRIBUTES ObjectAttributes, 61 | _In_opt_ PLARGE_INTEGER MaximumSize, 62 | _In_ ULONG SectionPageProtection, 63 | _In_ ULONG AllocationAttributes, 64 | _In_opt_ HANDLE FileHandle 65 | ); 66 | 67 | EXTERN_C 68 | NTSTATUS 69 | NTAPI 70 | NtMapViewOfSection( 71 | _In_ HANDLE SectionHandle, 72 | _In_ HANDLE ProcessHandle, 73 | _Inout_ PVOID *BaseAddress, 74 | _In_ ULONG_PTR ZeroBits, 75 | _In_ SIZE_T CommitSize, 76 | _Inout_opt_ PLARGE_INTEGER SectionOffset, 77 | _Inout_ PSIZE_T ViewSize, 78 | _In_ SECTION_INHERIT InheritDisposition, 79 | _In_ ULONG AllocationType, 80 | _In_ ULONG Win32Protect 81 | ); 82 | 83 | EXTERN_C 84 | NTSTATUS 85 | NTAPI 86 | NtUnmapViewOfSection( 87 | _In_ HANDLE ProcessHandle, 88 | _In_opt_ PVOID BaseAddress 89 | ); 90 | 91 | EXTERN_C 92 | NTSTATUS 93 | NTAPI 94 | NtClose( 95 | _In_ HANDLE Handle 96 | ); 97 | 98 | EXTERN_C 99 | PIMAGE_NT_HEADERS 100 | NTAPI 101 | RtlImageNtHeader( 102 | _In_ PVOID BaseAddress 103 | ); 104 | -------------------------------------------------------------------------------- /SelfRemappingCode/remap.cpp: -------------------------------------------------------------------------------- 1 | #include "remap.h" 2 | 3 | #include "log.h" 4 | #include "ntdll.h" 5 | 6 | 7 | //============================================================================= 8 | // Private Types 9 | //============================================================================= 10 | typedef BOOL(NTAPI* REMAP_ROUTINE)( 11 | _In_ PVOID pRemapRegion 12 | ); 13 | 14 | 15 | //============================================================================= 16 | // Module Globals 17 | //============================================================================= 18 | static ULONG g_CharacteristicsProtectionMap[2][2][2] = 19 | { 20 | { 21 | { PAGE_NOACCESS, PAGE_WRITECOPY }, 22 | { PAGE_READONLY, PAGE_READWRITE } 23 | 24 | }, 25 | { 26 | { PAGE_EXECUTE, PAGE_EXECUTE_WRITECOPY }, 27 | { PAGE_EXECUTE_READ, PAGE_EXECUTE_READWRITE } 28 | }, 29 | }; 30 | 31 | 32 | //============================================================================= 33 | // Private Prototypes 34 | //============================================================================= 35 | _Check_return_ 36 | static 37 | BOOL 38 | RmppVerifyPeSectionAlignment( 39 | _In_ PIMAGE_NT_HEADERS pNtHeaders 40 | ); 41 | 42 | static 43 | VOID 44 | RmppCopyPeSections( 45 | _In_ PIMAGE_NT_HEADERS pNtHeaders, 46 | _In_ ULONG_PTR DestinationBase 47 | ); 48 | 49 | _Check_return_ 50 | static 51 | BOOL 52 | RmppRemapImageRoutine( 53 | _In_ PVOID pRemapRegion 54 | ); 55 | 56 | _Check_return_ 57 | static 58 | ULONG 59 | RmppConvertSectionCharacteristicsToPageProtection( 60 | _In_ ULONG Characteristics 61 | ); 62 | 63 | _Check_return_ 64 | static 65 | BOOL 66 | RmppMapProtectedView( 67 | _In_ HANDLE hSection, 68 | _In_ ULONG_PTR BaseAddress, 69 | _In_ SIZE_T cbSize, 70 | _In_ SIZE_T cbOffset, 71 | _In_ ULONG Protection 72 | ); 73 | 74 | _Check_return_ 75 | static 76 | BOOL 77 | RmppValidateRemappedImageProtection( 78 | _In_ ULONG_PTR ImageBase 79 | ); 80 | 81 | _Check_return_ 82 | static 83 | BOOL 84 | RmppValidateRemappedPeSectionProtection( 85 | _In_ PVOID pSectionBase 86 | ); 87 | 88 | 89 | //============================================================================= 90 | // Public Interface 91 | //============================================================================= 92 | 93 | // 94 | // RmpRemapImage 95 | // 96 | // This function remaps the pe image at 'ImageBase' so that the page protection 97 | // of all pages contained in the image cannot be changed. 98 | // 99 | // The remapping process uses the following strategy: 100 | // 101 | // 1. The image is copied to an executable buffer referred to as the 'remap 102 | // region'. 103 | // 104 | // 2. The remap routine inside the remap region is located and invoked. 105 | // 106 | // 3. The remap routine creates a page-file-backed section to store the 107 | // remapped image. 108 | // 109 | // 4. The remap routine maps a view of the entire section and copies the 110 | // contents of the image to the view. This view is then unmapped. 111 | // 112 | // 5. The remap routine maps a view for each pe section in the image using the 113 | // relative virtual address of the pe section as the section offset for 114 | // the view. Each view is mapped using the 'SEC_NO_CHANGE' allocation 115 | // type to prevent page protection changes. 116 | // 117 | // 6. The remap routine completes and execution returns to the remapped image. 118 | // 119 | // NOTE This strategy requires each pe section in the image to be aligned to 120 | // the system allocation granularity. See the documentation for 121 | // 'ZwMapViewOfSection' for details. 122 | // 123 | // NOTE This function currently only supports x64 images. 124 | // 125 | _Use_decl_annotations_ 126 | BOOL 127 | RmpRemapImage( 128 | ULONG_PTR ImageBase 129 | ) 130 | { 131 | PIMAGE_NT_HEADERS pNtHeaders = NULL; 132 | PVOID pRemapRegion = NULL; 133 | REMAP_ROUTINE fpRemapRoutine = NULL; 134 | BOOL status = TRUE; 135 | 136 | DBG_PRINT("Remapping image at 0x%IX\n", ImageBase); 137 | 138 | pNtHeaders = RtlImageNtHeader((PVOID)ImageBase); 139 | if (!pNtHeaders) 140 | { 141 | ERR_PRINT("RtlImageNtHeader failed. (BaseAddress = 0x%IX)\n", 142 | ImageBase); 143 | status = FALSE; 144 | goto exit; 145 | } 146 | 147 | status = RmppVerifyPeSectionAlignment(pNtHeaders); 148 | if (!status) 149 | { 150 | ERR_PRINT("RmppVerifyPeSectionAlignment failed.\n"); 151 | goto exit; 152 | } 153 | 154 | // 155 | // Allocate an executable and writable buffer where the remap routine will 156 | // execute. 157 | // 158 | pRemapRegion = VirtualAlloc( 159 | NULL, 160 | pNtHeaders->OptionalHeader.SizeOfImage, 161 | MEM_COMMIT | MEM_RESERVE, 162 | PAGE_EXECUTE_READWRITE); 163 | if (!pRemapRegion) 164 | { 165 | ERR_PRINT("VirtualAlloc failed: %u\n", GetLastError()); 166 | status = FALSE; 167 | goto exit; 168 | } 169 | 170 | DBG_PRINT("RemapRegion: 0x%IX\n", (ULONG_PTR)pRemapRegion); 171 | 172 | // 173 | // Copy the image to the remap region. 174 | // 175 | RmppCopyPeSections(pNtHeaders, (ULONG_PTR)pRemapRegion); 176 | 177 | // 178 | // Locate the address of the remap routine inside the remap region. 179 | // 180 | fpRemapRoutine = (REMAP_ROUTINE)( 181 | (ULONG_PTR)pRemapRegion + 182 | (ULONG_PTR)RmppRemapImageRoutine - 183 | ImageBase); 184 | 185 | DBG_PRINT("RemapRoutine: 0x%IX\n", (ULONG_PTR)fpRemapRoutine); 186 | 187 | // 188 | // Invoke the remap routine inside the remap region. 189 | // 190 | status = fpRemapRoutine(pRemapRegion); 191 | if (!status) 192 | { 193 | ERR_PRINT("RmppRemapImageRoutine failed.\n"); 194 | goto exit; 195 | } 196 | 197 | // 198 | // Verify that each pe section in the remapped image is protected. 199 | // 200 | status = RmppValidateRemappedImageProtection(ImageBase); 201 | if (!status) 202 | { 203 | ERR_PRINT("RmppValidateRemappedImageProtection failed.\n"); 204 | goto exit; 205 | } 206 | 207 | exit: 208 | if (pRemapRegion) 209 | { 210 | if (!VirtualFree(pRemapRegion, 0, MEM_RELEASE)) 211 | { 212 | ERR_PRINT("VirtualFree failed: %u\n", GetLastError()); 213 | } 214 | } 215 | 216 | return status; 217 | } 218 | 219 | 220 | //============================================================================= 221 | // Private Interface 222 | //============================================================================= 223 | 224 | // 225 | // RmppVerifyPeSectionAlignment 226 | // 227 | // Verify that each pe section is aligned to the system allocation granularity. 228 | // 229 | _Use_decl_annotations_ 230 | static 231 | BOOL 232 | RmppVerifyPeSectionAlignment( 233 | PIMAGE_NT_HEADERS pNtHeaders 234 | ) 235 | { 236 | SYSTEM_INFO SystemInfo = {}; 237 | PIMAGE_SECTION_HEADER pSectionHeader = NULL; 238 | ULONG_PTR SectionBase = 0; 239 | BOOL status = TRUE; 240 | 241 | DBG_PRINT("Verifying pe section alignment:\n"); 242 | 243 | // 244 | // Query the system allocation granularity. 245 | // 246 | GetSystemInfo(&SystemInfo); 247 | 248 | pSectionHeader = IMAGE_FIRST_SECTION(pNtHeaders); 249 | 250 | for (WORD i = 0; i < pNtHeaders->FileHeader.NumberOfSections; ++i) 251 | { 252 | SectionBase = 253 | pNtHeaders->OptionalHeader.ImageBase + 254 | pSectionHeader[i].VirtualAddress; 255 | 256 | DBG_PRINT(" %-8.8s 0x%IX - 0x%IX, 0x%08X\n", 257 | pSectionHeader[i].Name, 258 | SectionBase, 259 | SectionBase + pSectionHeader[i].Misc.VirtualSize, 260 | pSectionHeader[i].Misc.VirtualSize); 261 | 262 | status = POINTER_IS_ALIGNED( 263 | SectionBase, 264 | SystemInfo.dwAllocationGranularity); 265 | if (!status) 266 | { 267 | ERR_PRINT("Unexpected section alignment. (SectionBase = 0x%IX)\n", 268 | SectionBase); 269 | goto exit; 270 | } 271 | } 272 | 273 | // 274 | // Verify pe header alignment. 275 | // 276 | status = POINTER_IS_ALIGNED( 277 | pNtHeaders->OptionalHeader.ImageBase, 278 | SystemInfo.dwAllocationGranularity); 279 | if (!status) 280 | { 281 | ERR_PRINT("Unexpected section alignment. (SectionBase = 0x%IX)\n", 282 | SectionBase); 283 | goto exit; 284 | } 285 | 286 | exit: 287 | return status; 288 | } 289 | 290 | 291 | // 292 | // RmppCopyPeSections 293 | // 294 | _Use_decl_annotations_ 295 | static 296 | VOID 297 | RmppCopyPeSections( 298 | PIMAGE_NT_HEADERS pNtHeaders, 299 | ULONG_PTR DestinationBase 300 | ) 301 | { 302 | ULONG_PTR SourceBase = 0; 303 | PIMAGE_SECTION_HEADER pSectionHeader = NULL; 304 | 305 | SourceBase = pNtHeaders->OptionalHeader.ImageBase; 306 | 307 | pSectionHeader = IMAGE_FIRST_SECTION(pNtHeaders); 308 | 309 | // 310 | // We copy each pe section individually because images compiled with the 311 | // '/ALIGN' linker option will have reserved memory padding. 312 | // 313 | for (WORD i = 0; i < pNtHeaders->FileHeader.NumberOfSections; ++i) 314 | { 315 | DBG_PRINT("Copying %-8.8s from 0x%IX to 0x%IX, 0x%08X\n", 316 | pSectionHeader[i].Name, 317 | SourceBase + pSectionHeader[i].VirtualAddress, 318 | DestinationBase + pSectionHeader[i].VirtualAddress, 319 | pSectionHeader[i].Misc.VirtualSize); 320 | 321 | RtlCopyMemory( 322 | (PVOID)(DestinationBase + pSectionHeader[i].VirtualAddress), 323 | (PVOID)(SourceBase + pSectionHeader[i].VirtualAddress), 324 | pSectionHeader[i].Misc.VirtualSize); 325 | } 326 | 327 | // 328 | // Copy the pe header. 329 | // 330 | RtlCopyMemory((PVOID)DestinationBase, (PVOID)SourceBase, PAGE_SIZE); 331 | } 332 | 333 | 334 | // 335 | // RmppRemapImageRoutine 336 | // 337 | // This routine unmaps the original image then reconstructs it as contiguous 338 | // memory mapped views. 339 | // 340 | _Use_decl_annotations_ 341 | static 342 | BOOL 343 | RmppRemapImageRoutine( 344 | PVOID pRemapRegion 345 | ) 346 | { 347 | PIMAGE_NT_HEADERS pNtHeaders = NULL; 348 | HANDLE hSection = NULL; 349 | LARGE_INTEGER cbSectionSize = {}; 350 | PVOID pViewBase = NULL; 351 | ULONG_PTR ImageBase = 0; 352 | LARGE_INTEGER cbSectionOffset = {}; 353 | SIZE_T cbViewSize = 0; 354 | PIMAGE_SECTION_HEADER pSectionHeader = NULL; 355 | ULONG Protection = 0; 356 | NTSTATUS ntstatus = STATUS_SUCCESS; 357 | BOOL status = TRUE; 358 | 359 | pNtHeaders = RtlImageNtHeader(pRemapRegion); 360 | if (!pNtHeaders) 361 | { 362 | ERR_PRINT("RtlImageNtHeader failed. (BaseAddress = 0x%IX)\n", 363 | pRemapRegion); 364 | status = FALSE; 365 | goto exit; 366 | } 367 | 368 | cbSectionSize.QuadPart = pNtHeaders->OptionalHeader.SizeOfImage; 369 | 370 | // 371 | // Create a page-file-backed section to store the remapped image. 372 | // 373 | ntstatus = NtCreateSection( 374 | &hSection, 375 | SECTION_ALL_ACCESS, 376 | NULL, 377 | &cbSectionSize, 378 | PAGE_EXECUTE_READWRITE, 379 | SEC_COMMIT | SEC_NO_CHANGE, 380 | NULL); 381 | if (!NT_SUCCESS(ntstatus)) 382 | { 383 | ERR_PRINT("NtCreateSection failed: 0x%X\n", ntstatus); 384 | status = FALSE; 385 | goto exit; 386 | } 387 | 388 | // 389 | // Map a view of the entire section. 390 | // 391 | ntstatus = NtMapViewOfSection( 392 | hSection, 393 | NtCurrentProcess(), 394 | &pViewBase, 395 | 0, 396 | pNtHeaders->OptionalHeader.SizeOfImage, 397 | &cbSectionOffset, 398 | &cbViewSize, 399 | ViewUnmap, 400 | 0, 401 | PAGE_READWRITE); 402 | if (!NT_SUCCESS(ntstatus)) 403 | { 404 | ERR_PRINT("NtMapViewOfSection failed: 0x%X\n", ntstatus); 405 | status = FALSE; 406 | goto exit; 407 | } 408 | 409 | // 410 | // Copy the image to our view. 411 | // 412 | RmppCopyPeSections(pNtHeaders, (ULONG_PTR)pViewBase); 413 | 414 | // 415 | // Unmap the copy-view because we no longer need it. 416 | // 417 | ntstatus = NtUnmapViewOfSection(NtCurrentProcess(), pViewBase); 418 | if (!NT_SUCCESS(ntstatus)) 419 | { 420 | ERR_PRINT("NtUnmapViewOfSection failed: 0x%X\n", ntstatus); 421 | status = FALSE; 422 | goto exit; 423 | } 424 | 425 | // 426 | // Unmap the original image. 427 | // 428 | ImageBase = pNtHeaders->OptionalHeader.ImageBase; 429 | 430 | ntstatus = NtUnmapViewOfSection(NtCurrentProcess(), (PVOID)ImageBase); 431 | if (!NT_SUCCESS(ntstatus)) 432 | { 433 | ERR_PRINT("NtUnmapViewOfSection failed: 0x%X\n", ntstatus); 434 | status = FALSE; 435 | goto exit; 436 | } 437 | 438 | // 439 | // Reconstruct the image by mapping a view of the section for each pe 440 | // section in the image. 441 | // 442 | pSectionHeader = IMAGE_FIRST_SECTION(pNtHeaders); 443 | 444 | for (WORD i = 0; i < pNtHeaders->FileHeader.NumberOfSections; ++i) 445 | { 446 | Protection = RmppConvertSectionCharacteristicsToPageProtection( 447 | pSectionHeader[i].Characteristics); 448 | 449 | status = RmppMapProtectedView( 450 | hSection, 451 | ImageBase + pSectionHeader[i].VirtualAddress, 452 | pSectionHeader[i].Misc.VirtualSize, 453 | pSectionHeader[i].VirtualAddress, 454 | Protection); 455 | if (!status) 456 | { 457 | ERR_PRINT("RmppMapProtectedView failed.\n"); 458 | goto exit; 459 | } 460 | } 461 | 462 | // 463 | // Map a view for the pe header. 464 | // 465 | status = RmppMapProtectedView( 466 | hSection, 467 | ImageBase, 468 | PAGE_SIZE, 469 | 0, 470 | PAGE_READONLY); 471 | if (!status) 472 | { 473 | ERR_PRINT("RmppMapProtectedView failed.\n"); 474 | goto exit; 475 | } 476 | 477 | exit: 478 | if (hSection) 479 | { 480 | ntstatus = NtClose(hSection); 481 | if (!NT_SUCCESS(ntstatus)) 482 | { 483 | ERR_PRINT("NtClose failed: 0x%X\n", ntstatus); 484 | } 485 | } 486 | 487 | return status; 488 | } 489 | 490 | 491 | // 492 | // RmppConvertSectionCharacteristicsToPageProtection 493 | // 494 | _Use_decl_annotations_ 495 | static 496 | ULONG 497 | RmppConvertSectionCharacteristicsToPageProtection( 498 | ULONG Characteristics 499 | ) 500 | { 501 | BOOL fExecutable = FALSE; 502 | BOOL fReadable = FALSE; 503 | BOOL fWritable = FALSE; 504 | ULONG Protection = 0; 505 | 506 | if (0 != (IMAGE_SCN_MEM_EXECUTE & Characteristics)) 507 | { 508 | fExecutable = TRUE; 509 | } 510 | 511 | if (0 != (IMAGE_SCN_MEM_READ & Characteristics)) 512 | { 513 | fReadable = TRUE; 514 | } 515 | 516 | if (0 != (IMAGE_SCN_MEM_WRITE & Characteristics)) 517 | { 518 | fWritable = TRUE; 519 | } 520 | 521 | Protection = 522 | g_CharacteristicsProtectionMap[fExecutable][fReadable][fWritable]; 523 | 524 | if (0 != (IMAGE_SCN_MEM_NOT_CACHED & Characteristics)) 525 | { 526 | Protection |= PAGE_NOCACHE; 527 | } 528 | 529 | return Protection; 530 | } 531 | 532 | 533 | // 534 | // RmppMapProtectedView 535 | // 536 | _Use_decl_annotations_ 537 | static 538 | BOOL 539 | RmppMapProtectedView( 540 | HANDLE hSection, 541 | ULONG_PTR BaseAddress, 542 | SIZE_T cbSize, 543 | SIZE_T cbOffset, 544 | ULONG Protection 545 | ) 546 | { 547 | LARGE_INTEGER cbSectionOffset = {}; 548 | PVOID pViewBase = NULL; 549 | SIZE_T cbViewSize = 0; 550 | NTSTATUS ntstatus = STATUS_SUCCESS; 551 | BOOL status = TRUE; 552 | 553 | pViewBase = (PVOID)BaseAddress; 554 | cbViewSize = cbSize; 555 | cbSectionOffset.QuadPart = cbOffset; 556 | 557 | ntstatus = NtMapViewOfSection( 558 | hSection, 559 | NtCurrentProcess(), 560 | &pViewBase, 561 | 0, 562 | 0, 563 | &cbSectionOffset, 564 | &cbViewSize, 565 | ViewUnmap, 566 | SEC_NO_CHANGE, 567 | Protection); 568 | if (!NT_SUCCESS(ntstatus)) 569 | { 570 | ERR_PRINT( 571 | "NtMapViewOfSection failed: 0x%X (Base = 0x%IX, Offset = 0x%IX, Size = 0x%IX)\n", 572 | ntstatus, 573 | pViewBase, 574 | cbSectionOffset.QuadPart, 575 | cbViewSize); 576 | status = FALSE; 577 | goto exit; 578 | } 579 | 580 | exit: 581 | return status; 582 | } 583 | 584 | 585 | // 586 | // RmppValidateRemappedImageProtection 587 | // 588 | _Use_decl_annotations_ 589 | static 590 | BOOL 591 | RmppValidateRemappedImageProtection( 592 | ULONG_PTR ImageBase 593 | ) 594 | { 595 | PIMAGE_NT_HEADERS pNtHeaders = NULL; 596 | PIMAGE_SECTION_HEADER pSectionHeader = NULL; 597 | BOOL status = TRUE; 598 | 599 | DBG_PRINT("Validating remapped image protection.\n"); 600 | 601 | pNtHeaders = RtlImageNtHeader((PVOID)ImageBase); 602 | if (!pNtHeaders) 603 | { 604 | ERR_PRINT("RtlImageNtHeader failed. (BaseAddress = 0x%IX)\n", 605 | ImageBase); 606 | status = FALSE; 607 | goto exit; 608 | } 609 | 610 | pSectionHeader = IMAGE_FIRST_SECTION(pNtHeaders); 611 | 612 | for (WORD i = 0; i < pNtHeaders->FileHeader.NumberOfSections; ++i) 613 | { 614 | status = RmppValidateRemappedPeSectionProtection( 615 | (PVOID)(ImageBase + pSectionHeader[i].VirtualAddress)); 616 | if (!status) 617 | { 618 | ERR_PRINT("RmppValidateRemappedPeSectionProtection failed.\n"); 619 | goto exit; 620 | } 621 | } 622 | 623 | // 624 | // Validate the pe header. 625 | // 626 | status = RmppValidateRemappedPeSectionProtection((PVOID)ImageBase); 627 | if (!status) 628 | { 629 | ERR_PRINT("RmppValidateRemappedPeSectionProtection failed.\n"); 630 | goto exit; 631 | } 632 | 633 | exit: 634 | return status; 635 | } 636 | 637 | 638 | // 639 | // RmppValidateRemappedPeSectionProtection 640 | // 641 | _Use_decl_annotations_ 642 | static 643 | BOOL 644 | RmppValidateRemappedPeSectionProtection( 645 | PVOID pSectionBase 646 | ) 647 | { 648 | MEMORY_BASIC_INFORMATION MemoryBasicInfo = {}; 649 | ULONG TestProtect = 0; 650 | ULONG PreviousProtect = 0; 651 | BOOL status = TRUE; 652 | 653 | // 654 | // Query the current page protection. 655 | // 656 | if (!VirtualQuery(pSectionBase, &MemoryBasicInfo, sizeof(MemoryBasicInfo))) 657 | { 658 | ERR_PRINT("VirtualQuery failed: %u (BaseAddress = 0x%IX)\n", 659 | GetLastError(), 660 | pSectionBase); 661 | status = FALSE; 662 | goto exit; 663 | } 664 | 665 | // 666 | // We use PAGE_EXECUTE_READWRITE as our test protection value because it is 667 | // the most permissive page protection. 668 | // 669 | if (PAGE_EXECUTE_READWRITE != MemoryBasicInfo.Protect) 670 | { 671 | TestProtect = PAGE_EXECUTE_READWRITE; 672 | } 673 | else 674 | { 675 | TestProtect = PAGE_NOACCESS; 676 | } 677 | 678 | // 679 | // Attempt to modify the page protection of every page contained in the 680 | // memory region. This should fail because each view was mapped with the 681 | // SEC_NO_CHANGE allocation type. 682 | // 683 | status = VirtualProtect( 684 | pSectionBase, 685 | MemoryBasicInfo.RegionSize, 686 | TestProtect, 687 | &PreviousProtect); 688 | if (status) 689 | { 690 | ERR_PRINT( 691 | "Section is not protected. (BaseAddress = 0x%IX, Protect = 0x%X)\n", 692 | pSectionBase, 693 | PreviousProtect); 694 | status = FALSE; 695 | goto exit; 696 | } 697 | 698 | // Reset the status code to indicate success. 699 | status = TRUE; 700 | 701 | exit: 702 | return status; 703 | } 704 | -------------------------------------------------------------------------------- /SelfRemappingCode/remap.h: -------------------------------------------------------------------------------- 1 | #pragma once 2 | 3 | #include 4 | 5 | //============================================================================= 6 | // Public Interface 7 | //============================================================================= 8 | _Check_return_ 9 | BOOL 10 | RmpRemapImage( 11 | _In_ ULONG_PTR ImageBase 12 | ); 13 | --------------------------------------------------------------------------------