| 1 | use core::convert::TryFrom; |
| 2 | use core::{iter, result, slice, str}; |
| 3 | |
| 4 | use crate::endian::LittleEndian as LE; |
| 5 | use crate::pe; |
| 6 | use crate::read::util::StringTable; |
| 7 | use crate::read::{ |
| 8 | self, CompressedData, CompressedFileRange, Error, ObjectSection, ObjectSegment, ReadError, |
| 9 | ReadRef, RelocationMap, Result, SectionFlags, SectionIndex, SectionKind, SegmentFlags, |
| 10 | }; |
| 11 | |
| 12 | use super::{CoffFile, CoffHeader, CoffRelocationIterator}; |
| 13 | |
| 14 | /// The table of section headers in a COFF or PE file. |
| 15 | /// |
| 16 | /// Returned by [`CoffHeader::sections`] and |
| 17 | /// [`ImageNtHeaders::sections`](crate::read::pe::ImageNtHeaders::sections). |
| 18 | #[derive (Debug, Default, Clone, Copy)] |
| 19 | pub struct SectionTable<'data> { |
| 20 | sections: &'data [pe::ImageSectionHeader], |
| 21 | } |
| 22 | |
| 23 | impl<'data> SectionTable<'data> { |
| 24 | /// Parse the section table. |
| 25 | /// |
| 26 | /// `data` must be the entire file data. |
| 27 | /// `offset` must be after the optional file header. |
| 28 | pub fn parse<Coff: CoffHeader, R: ReadRef<'data>>( |
| 29 | header: &Coff, |
| 30 | data: R, |
| 31 | offset: u64, |
| 32 | ) -> Result<Self> { |
| 33 | let sections = data |
| 34 | .read_slice_at(offset, header.number_of_sections() as usize) |
| 35 | .read_error("Invalid COFF/PE section headers" )?; |
| 36 | Ok(SectionTable { sections }) |
| 37 | } |
| 38 | |
| 39 | /// Iterate over the section headers. |
| 40 | /// |
| 41 | /// Warning: section indices start at 1. |
| 42 | #[inline ] |
| 43 | pub fn iter(&self) -> slice::Iter<'data, pe::ImageSectionHeader> { |
| 44 | self.sections.iter() |
| 45 | } |
| 46 | |
| 47 | /// Iterate over the section headers and their indices. |
| 48 | pub fn enumerate(&self) -> impl Iterator<Item = (SectionIndex, &'data pe::ImageSectionHeader)> { |
| 49 | self.sections |
| 50 | .iter() |
| 51 | .enumerate() |
| 52 | .map(|(i, section)| (SectionIndex(i + 1), section)) |
| 53 | } |
| 54 | |
| 55 | /// Return true if the section table is empty. |
| 56 | #[inline ] |
| 57 | pub fn is_empty(&self) -> bool { |
| 58 | self.sections.is_empty() |
| 59 | } |
| 60 | |
| 61 | /// The number of section headers. |
| 62 | #[inline ] |
| 63 | pub fn len(&self) -> usize { |
| 64 | self.sections.len() |
| 65 | } |
| 66 | |
| 67 | /// Return the section header at the given index. |
| 68 | /// |
| 69 | /// The index is 1-based. |
| 70 | pub fn section(&self, index: SectionIndex) -> read::Result<&'data pe::ImageSectionHeader> { |
| 71 | self.sections |
| 72 | .get(index.0.wrapping_sub(1)) |
| 73 | .read_error("Invalid COFF/PE section index" ) |
| 74 | } |
| 75 | |
| 76 | /// Return the section header with the given name. |
| 77 | /// |
| 78 | /// The returned index is 1-based. |
| 79 | /// |
| 80 | /// Ignores sections with invalid names. |
| 81 | pub fn section_by_name<R: ReadRef<'data>>( |
| 82 | &self, |
| 83 | strings: StringTable<'data, R>, |
| 84 | name: &[u8], |
| 85 | ) -> Option<(SectionIndex, &'data pe::ImageSectionHeader)> { |
| 86 | self.enumerate() |
| 87 | .find(|(_, section)| section.name(strings) == Ok(name)) |
| 88 | } |
| 89 | |
| 90 | /// Compute the maximum file offset used by sections. |
| 91 | /// |
| 92 | /// This will usually match the end of file, unless the PE file has a |
| 93 | /// [data overlay](https://security.stackexchange.com/questions/77336/how-is-the-file-overlay-read-by-an-exe-virus) |
| 94 | pub fn max_section_file_offset(&self) -> u64 { |
| 95 | let mut max = 0; |
| 96 | for section in self.iter() { |
| 97 | match (section.pointer_to_raw_data.get(LE) as u64) |
| 98 | .checked_add(section.size_of_raw_data.get(LE) as u64) |
| 99 | { |
| 100 | None => { |
| 101 | // This cannot happen, we're suming two u32 into a u64 |
| 102 | continue; |
| 103 | } |
| 104 | Some(end_of_section) => { |
| 105 | if end_of_section > max { |
| 106 | max = end_of_section; |
| 107 | } |
| 108 | } |
| 109 | } |
| 110 | } |
| 111 | max |
| 112 | } |
| 113 | } |
| 114 | |
| 115 | /// An iterator for the loadable sections in a [`CoffBigFile`](super::CoffBigFile). |
| 116 | pub type CoffBigSegmentIterator<'data, 'file, R = &'data [u8]> = |
| 117 | CoffSegmentIterator<'data, 'file, R, pe::AnonObjectHeaderBigobj>; |
| 118 | |
| 119 | /// An iterator for the loadable sections in a [`CoffFile`]. |
| 120 | #[derive (Debug)] |
| 121 | pub struct CoffSegmentIterator< |
| 122 | 'data, |
| 123 | 'file, |
| 124 | R: ReadRef<'data> = &'data [u8], |
| 125 | Coff: CoffHeader = pe::ImageFileHeader, |
| 126 | > { |
| 127 | pub(super) file: &'file CoffFile<'data, R, Coff>, |
| 128 | pub(super) iter: slice::Iter<'data, pe::ImageSectionHeader>, |
| 129 | } |
| 130 | |
| 131 | impl<'data, 'file, R: ReadRef<'data>, Coff: CoffHeader> Iterator |
| 132 | for CoffSegmentIterator<'data, 'file, R, Coff> |
| 133 | { |
| 134 | type Item = CoffSegment<'data, 'file, R, Coff>; |
| 135 | |
| 136 | fn next(&mut self) -> Option<Self::Item> { |
| 137 | self.iter.next().map(|section: &'data ImageSectionHeader| CoffSegment { |
| 138 | file: self.file, |
| 139 | section, |
| 140 | }) |
| 141 | } |
| 142 | } |
| 143 | |
| 144 | /// A loadable section in a [`CoffBigFile`](super::CoffBigFile). |
| 145 | /// |
| 146 | /// Most functionality is provided by the [`ObjectSegment`] trait implementation. |
| 147 | pub type CoffBigSegment<'data, 'file, R = &'data [u8]> = |
| 148 | CoffSegment<'data, 'file, R, pe::AnonObjectHeaderBigobj>; |
| 149 | |
| 150 | /// A loadable section in a [`CoffFile`]. |
| 151 | /// |
| 152 | /// Most functionality is provided by the [`ObjectSegment`] trait implementation. |
| 153 | #[derive (Debug)] |
| 154 | pub struct CoffSegment< |
| 155 | 'data, |
| 156 | 'file, |
| 157 | R: ReadRef<'data> = &'data [u8], |
| 158 | Coff: CoffHeader = pe::ImageFileHeader, |
| 159 | > { |
| 160 | pub(super) file: &'file CoffFile<'data, R, Coff>, |
| 161 | pub(super) section: &'data pe::ImageSectionHeader, |
| 162 | } |
| 163 | |
| 164 | impl<'data, 'file, R: ReadRef<'data>, Coff: CoffHeader> CoffSegment<'data, 'file, R, Coff> { |
| 165 | /// Get the COFF file containing this segment. |
| 166 | pub fn coff_file(&self) -> &'file CoffFile<'data, R, Coff> { |
| 167 | self.file |
| 168 | } |
| 169 | |
| 170 | /// Get the raw COFF section header. |
| 171 | pub fn coff_section(&self) -> &'data pe::ImageSectionHeader { |
| 172 | self.section |
| 173 | } |
| 174 | |
| 175 | fn bytes(&self) -> Result<&'data [u8]> { |
| 176 | self.section |
| 177 | .coff_data(self.file.data) |
| 178 | .read_error("Invalid COFF section offset or size" ) |
| 179 | } |
| 180 | } |
| 181 | |
| 182 | impl<'data, 'file, R: ReadRef<'data>, Coff: CoffHeader> read::private::Sealed |
| 183 | for CoffSegment<'data, 'file, R, Coff> |
| 184 | { |
| 185 | } |
| 186 | |
| 187 | impl<'data, 'file, R: ReadRef<'data>, Coff: CoffHeader> ObjectSegment<'data> |
| 188 | for CoffSegment<'data, 'file, R, Coff> |
| 189 | { |
| 190 | #[inline ] |
| 191 | fn address(&self) -> u64 { |
| 192 | u64::from(self.section.virtual_address.get(LE)) |
| 193 | } |
| 194 | |
| 195 | #[inline ] |
| 196 | fn size(&self) -> u64 { |
| 197 | u64::from(self.section.virtual_size.get(LE)) |
| 198 | } |
| 199 | |
| 200 | #[inline ] |
| 201 | fn align(&self) -> u64 { |
| 202 | self.section.coff_alignment() |
| 203 | } |
| 204 | |
| 205 | #[inline ] |
| 206 | fn file_range(&self) -> (u64, u64) { |
| 207 | let (offset, size) = self.section.coff_file_range().unwrap_or((0, 0)); |
| 208 | (u64::from(offset), u64::from(size)) |
| 209 | } |
| 210 | |
| 211 | fn data(&self) -> Result<&'data [u8]> { |
| 212 | self.bytes() |
| 213 | } |
| 214 | |
| 215 | fn data_range(&self, address: u64, size: u64) -> Result<Option<&'data [u8]>> { |
| 216 | Ok(read::util::data_range( |
| 217 | self.bytes()?, |
| 218 | self.address(), |
| 219 | address, |
| 220 | size, |
| 221 | )) |
| 222 | } |
| 223 | |
| 224 | #[inline ] |
| 225 | fn name_bytes(&self) -> Result<Option<&[u8]>> { |
| 226 | self.section |
| 227 | .name(self.file.common.symbols.strings()) |
| 228 | .map(Some) |
| 229 | } |
| 230 | |
| 231 | #[inline ] |
| 232 | fn name(&self) -> Result<Option<&str>> { |
| 233 | let name = self.section.name(self.file.common.symbols.strings())?; |
| 234 | str::from_utf8(name) |
| 235 | .ok() |
| 236 | .read_error("Non UTF-8 COFF section name" ) |
| 237 | .map(Some) |
| 238 | } |
| 239 | |
| 240 | #[inline ] |
| 241 | fn flags(&self) -> SegmentFlags { |
| 242 | let characteristics = self.section.characteristics.get(LE); |
| 243 | SegmentFlags::Coff { characteristics } |
| 244 | } |
| 245 | } |
| 246 | |
| 247 | /// An iterator for the sections in a [`CoffBigFile`](super::CoffBigFile). |
| 248 | pub type CoffBigSectionIterator<'data, 'file, R = &'data [u8]> = |
| 249 | CoffSectionIterator<'data, 'file, R, pe::AnonObjectHeaderBigobj>; |
| 250 | |
| 251 | /// An iterator for the sections in a [`CoffFile`]. |
| 252 | #[derive (Debug)] |
| 253 | pub struct CoffSectionIterator< |
| 254 | 'data, |
| 255 | 'file, |
| 256 | R: ReadRef<'data> = &'data [u8], |
| 257 | Coff: CoffHeader = pe::ImageFileHeader, |
| 258 | > { |
| 259 | pub(super) file: &'file CoffFile<'data, R, Coff>, |
| 260 | pub(super) iter: iter::Enumerate<slice::Iter<'data, pe::ImageSectionHeader>>, |
| 261 | } |
| 262 | |
| 263 | impl<'data, 'file, R: ReadRef<'data>, Coff: CoffHeader> Iterator |
| 264 | for CoffSectionIterator<'data, 'file, R, Coff> |
| 265 | { |
| 266 | type Item = CoffSection<'data, 'file, R, Coff>; |
| 267 | |
| 268 | fn next(&mut self) -> Option<Self::Item> { |
| 269 | self.iter.next().map(|(index: usize, section: &'data ImageSectionHeader)| CoffSection { |
| 270 | file: self.file, |
| 271 | index: SectionIndex(index + 1), |
| 272 | section, |
| 273 | }) |
| 274 | } |
| 275 | } |
| 276 | |
| 277 | /// A section in a [`CoffBigFile`](super::CoffBigFile). |
| 278 | /// |
| 279 | /// Most functionality is provided by the [`ObjectSection`] trait implementation. |
| 280 | pub type CoffBigSection<'data, 'file, R = &'data [u8]> = |
| 281 | CoffSection<'data, 'file, R, pe::AnonObjectHeaderBigobj>; |
| 282 | |
| 283 | /// A section in a [`CoffFile`]. |
| 284 | /// |
| 285 | /// Most functionality is provided by the [`ObjectSection`] trait implementation. |
| 286 | #[derive (Debug)] |
| 287 | pub struct CoffSection< |
| 288 | 'data, |
| 289 | 'file, |
| 290 | R: ReadRef<'data> = &'data [u8], |
| 291 | Coff: CoffHeader = pe::ImageFileHeader, |
| 292 | > { |
| 293 | pub(super) file: &'file CoffFile<'data, R, Coff>, |
| 294 | pub(super) index: SectionIndex, |
| 295 | pub(super) section: &'data pe::ImageSectionHeader, |
| 296 | } |
| 297 | |
| 298 | impl<'data, 'file, R: ReadRef<'data>, Coff: CoffHeader> CoffSection<'data, 'file, R, Coff> { |
| 299 | /// Get the COFF file containing this section. |
| 300 | pub fn coff_file(&self) -> &'file CoffFile<'data, R, Coff> { |
| 301 | self.file |
| 302 | } |
| 303 | |
| 304 | /// Get the raw COFF section header. |
| 305 | pub fn coff_section(&self) -> &'data pe::ImageSectionHeader { |
| 306 | self.section |
| 307 | } |
| 308 | |
| 309 | /// Get the raw COFF relocations for this section. |
| 310 | pub fn coff_relocations(&self) -> Result<&'data [pe::ImageRelocation]> { |
| 311 | self.section.coff_relocations(self.file.data) |
| 312 | } |
| 313 | |
| 314 | fn bytes(&self) -> Result<&'data [u8]> { |
| 315 | self.section |
| 316 | .coff_data(self.file.data) |
| 317 | .read_error("Invalid COFF section offset or size" ) |
| 318 | } |
| 319 | } |
| 320 | |
| 321 | impl<'data, 'file, R: ReadRef<'data>, Coff: CoffHeader> read::private::Sealed |
| 322 | for CoffSection<'data, 'file, R, Coff> |
| 323 | { |
| 324 | } |
| 325 | |
| 326 | impl<'data, 'file, R: ReadRef<'data>, Coff: CoffHeader> ObjectSection<'data> |
| 327 | for CoffSection<'data, 'file, R, Coff> |
| 328 | { |
| 329 | type RelocationIterator = CoffRelocationIterator<'data, 'file, R, Coff>; |
| 330 | |
| 331 | #[inline ] |
| 332 | fn index(&self) -> SectionIndex { |
| 333 | self.index |
| 334 | } |
| 335 | |
| 336 | #[inline ] |
| 337 | fn address(&self) -> u64 { |
| 338 | u64::from(self.section.virtual_address.get(LE)) |
| 339 | } |
| 340 | |
| 341 | #[inline ] |
| 342 | fn size(&self) -> u64 { |
| 343 | // TODO: This may need to be the length from the auxiliary symbol for this section. |
| 344 | u64::from(self.section.size_of_raw_data.get(LE)) |
| 345 | } |
| 346 | |
| 347 | #[inline ] |
| 348 | fn align(&self) -> u64 { |
| 349 | self.section.coff_alignment() |
| 350 | } |
| 351 | |
| 352 | #[inline ] |
| 353 | fn file_range(&self) -> Option<(u64, u64)> { |
| 354 | let (offset, size) = self.section.coff_file_range()?; |
| 355 | Some((u64::from(offset), u64::from(size))) |
| 356 | } |
| 357 | |
| 358 | fn data(&self) -> Result<&'data [u8]> { |
| 359 | self.bytes() |
| 360 | } |
| 361 | |
| 362 | fn data_range(&self, address: u64, size: u64) -> Result<Option<&'data [u8]>> { |
| 363 | Ok(read::util::data_range( |
| 364 | self.bytes()?, |
| 365 | self.address(), |
| 366 | address, |
| 367 | size, |
| 368 | )) |
| 369 | } |
| 370 | |
| 371 | #[inline ] |
| 372 | fn compressed_file_range(&self) -> Result<CompressedFileRange> { |
| 373 | Ok(CompressedFileRange::none(self.file_range())) |
| 374 | } |
| 375 | |
| 376 | #[inline ] |
| 377 | fn compressed_data(&self) -> Result<CompressedData<'data>> { |
| 378 | self.data().map(CompressedData::none) |
| 379 | } |
| 380 | |
| 381 | #[inline ] |
| 382 | fn name_bytes(&self) -> Result<&'data [u8]> { |
| 383 | self.section.name(self.file.common.symbols.strings()) |
| 384 | } |
| 385 | |
| 386 | #[inline ] |
| 387 | fn name(&self) -> Result<&'data str> { |
| 388 | let name = self.name_bytes()?; |
| 389 | str::from_utf8(name) |
| 390 | .ok() |
| 391 | .read_error("Non UTF-8 COFF section name" ) |
| 392 | } |
| 393 | |
| 394 | #[inline ] |
| 395 | fn segment_name_bytes(&self) -> Result<Option<&[u8]>> { |
| 396 | Ok(None) |
| 397 | } |
| 398 | |
| 399 | #[inline ] |
| 400 | fn segment_name(&self) -> Result<Option<&str>> { |
| 401 | Ok(None) |
| 402 | } |
| 403 | |
| 404 | #[inline ] |
| 405 | fn kind(&self) -> SectionKind { |
| 406 | self.section.kind() |
| 407 | } |
| 408 | |
| 409 | fn relocations(&self) -> CoffRelocationIterator<'data, 'file, R, Coff> { |
| 410 | let relocations = self.coff_relocations().unwrap_or(&[]); |
| 411 | CoffRelocationIterator { |
| 412 | file: self.file, |
| 413 | iter: relocations.iter(), |
| 414 | } |
| 415 | } |
| 416 | |
| 417 | fn relocation_map(&self) -> read::Result<RelocationMap> { |
| 418 | RelocationMap::new(self.file, self) |
| 419 | } |
| 420 | |
| 421 | fn flags(&self) -> SectionFlags { |
| 422 | SectionFlags::Coff { |
| 423 | characteristics: self.section.characteristics.get(LE), |
| 424 | } |
| 425 | } |
| 426 | } |
| 427 | |
| 428 | impl pe::ImageSectionHeader { |
| 429 | pub(crate) fn kind(&self) -> SectionKind { |
| 430 | let characteristics: u32 = self.characteristics.get(LE); |
| 431 | if characteristics & (pe::IMAGE_SCN_CNT_CODE | pe::IMAGE_SCN_MEM_EXECUTE) != 0 { |
| 432 | SectionKind::Text |
| 433 | } else if characteristics & pe::IMAGE_SCN_CNT_INITIALIZED_DATA != 0 { |
| 434 | if characteristics & pe::IMAGE_SCN_MEM_DISCARDABLE != 0 { |
| 435 | SectionKind::Other |
| 436 | } else if characteristics & pe::IMAGE_SCN_MEM_WRITE != 0 { |
| 437 | SectionKind::Data |
| 438 | } else { |
| 439 | SectionKind::ReadOnlyData |
| 440 | } |
| 441 | } else if characteristics & pe::IMAGE_SCN_CNT_UNINITIALIZED_DATA != 0 { |
| 442 | SectionKind::UninitializedData |
| 443 | } else if characteristics & pe::IMAGE_SCN_LNK_INFO != 0 { |
| 444 | SectionKind::Linker |
| 445 | } else { |
| 446 | SectionKind::Unknown |
| 447 | } |
| 448 | } |
| 449 | } |
| 450 | |
| 451 | impl pe::ImageSectionHeader { |
| 452 | /// Return the string table offset of the section name. |
| 453 | /// |
| 454 | /// Returns `Ok(None)` if the name doesn't use the string table |
| 455 | /// and can be obtained with `raw_name` instead. |
| 456 | pub fn name_offset(&self) -> Result<Option<u32>> { |
| 457 | let bytes = &self.name; |
| 458 | if bytes[0] != b'/' { |
| 459 | return Ok(None); |
| 460 | } |
| 461 | |
| 462 | if bytes[1] == b'/' { |
| 463 | let mut offset = 0; |
| 464 | for byte in bytes[2..].iter() { |
| 465 | let digit = match byte { |
| 466 | b'A' ..=b'Z' => byte - b'A' , |
| 467 | b'a' ..=b'z' => byte - b'a' + 26, |
| 468 | b'0' ..=b'9' => byte - b'0' + 52, |
| 469 | b'+' => 62, |
| 470 | b'/' => 63, |
| 471 | _ => return Err(Error("Invalid COFF section name base-64 offset" )), |
| 472 | }; |
| 473 | offset = offset * 64 + digit as u64; |
| 474 | } |
| 475 | u32::try_from(offset) |
| 476 | .ok() |
| 477 | .read_error("Invalid COFF section name base-64 offset" ) |
| 478 | .map(Some) |
| 479 | } else { |
| 480 | let mut offset = 0; |
| 481 | for byte in bytes[1..].iter() { |
| 482 | let digit = match byte { |
| 483 | b'0' ..=b'9' => byte - b'0' , |
| 484 | 0 => break, |
| 485 | _ => return Err(Error("Invalid COFF section name base-10 offset" )), |
| 486 | }; |
| 487 | offset = offset * 10 + digit as u32; |
| 488 | } |
| 489 | Ok(Some(offset)) |
| 490 | } |
| 491 | } |
| 492 | |
| 493 | /// Return the section name. |
| 494 | /// |
| 495 | /// This handles decoding names that are offsets into the symbol string table. |
| 496 | pub fn name<'data, R: ReadRef<'data>>( |
| 497 | &'data self, |
| 498 | strings: StringTable<'data, R>, |
| 499 | ) -> Result<&'data [u8]> { |
| 500 | if let Some(offset) = self.name_offset()? { |
| 501 | strings |
| 502 | .get(offset) |
| 503 | .read_error("Invalid COFF section name offset" ) |
| 504 | } else { |
| 505 | Ok(self.raw_name()) |
| 506 | } |
| 507 | } |
| 508 | |
| 509 | /// Return the raw section name. |
| 510 | pub fn raw_name(&self) -> &[u8] { |
| 511 | let bytes = &self.name; |
| 512 | match memchr::memchr(b' \0' , bytes) { |
| 513 | Some(end) => &bytes[..end], |
| 514 | None => &bytes[..], |
| 515 | } |
| 516 | } |
| 517 | |
| 518 | /// Return the offset and size of the section in a COFF file. |
| 519 | /// |
| 520 | /// Returns `None` for sections that have no data in the file. |
| 521 | pub fn coff_file_range(&self) -> Option<(u32, u32)> { |
| 522 | if self.characteristics.get(LE) & pe::IMAGE_SCN_CNT_UNINITIALIZED_DATA != 0 { |
| 523 | None |
| 524 | } else { |
| 525 | let offset = self.pointer_to_raw_data.get(LE); |
| 526 | // Note: virtual size is not used for COFF. |
| 527 | let size = self.size_of_raw_data.get(LE); |
| 528 | Some((offset, size)) |
| 529 | } |
| 530 | } |
| 531 | |
| 532 | /// Return the section data in a COFF file. |
| 533 | /// |
| 534 | /// Returns `Ok(&[])` if the section has no data. |
| 535 | /// Returns `Err` for invalid values. |
| 536 | pub fn coff_data<'data, R: ReadRef<'data>>(&self, data: R) -> result::Result<&'data [u8], ()> { |
| 537 | if let Some((offset, size)) = self.coff_file_range() { |
| 538 | data.read_bytes_at(offset.into(), size.into()) |
| 539 | } else { |
| 540 | Ok(&[]) |
| 541 | } |
| 542 | } |
| 543 | |
| 544 | /// Return the section alignment in bytes. |
| 545 | /// |
| 546 | /// This is only valid for sections in a COFF file. |
| 547 | pub fn coff_alignment(&self) -> u64 { |
| 548 | match self.characteristics.get(LE) & pe::IMAGE_SCN_ALIGN_MASK { |
| 549 | pe::IMAGE_SCN_ALIGN_1BYTES => 1, |
| 550 | pe::IMAGE_SCN_ALIGN_2BYTES => 2, |
| 551 | pe::IMAGE_SCN_ALIGN_4BYTES => 4, |
| 552 | pe::IMAGE_SCN_ALIGN_8BYTES => 8, |
| 553 | pe::IMAGE_SCN_ALIGN_16BYTES => 16, |
| 554 | pe::IMAGE_SCN_ALIGN_32BYTES => 32, |
| 555 | pe::IMAGE_SCN_ALIGN_64BYTES => 64, |
| 556 | pe::IMAGE_SCN_ALIGN_128BYTES => 128, |
| 557 | pe::IMAGE_SCN_ALIGN_256BYTES => 256, |
| 558 | pe::IMAGE_SCN_ALIGN_512BYTES => 512, |
| 559 | pe::IMAGE_SCN_ALIGN_1024BYTES => 1024, |
| 560 | pe::IMAGE_SCN_ALIGN_2048BYTES => 2048, |
| 561 | pe::IMAGE_SCN_ALIGN_4096BYTES => 4096, |
| 562 | pe::IMAGE_SCN_ALIGN_8192BYTES => 8192, |
| 563 | _ => 16, |
| 564 | } |
| 565 | } |
| 566 | |
| 567 | /// Read the relocations in a COFF file. |
| 568 | /// |
| 569 | /// `data` must be the entire file data. |
| 570 | pub fn coff_relocations<'data, R: ReadRef<'data>>( |
| 571 | &self, |
| 572 | data: R, |
| 573 | ) -> read::Result<&'data [pe::ImageRelocation]> { |
| 574 | let mut pointer = self.pointer_to_relocations.get(LE).into(); |
| 575 | let mut number: usize = self.number_of_relocations.get(LE).into(); |
| 576 | if number == u16::MAX.into() |
| 577 | && self.characteristics.get(LE) & pe::IMAGE_SCN_LNK_NRELOC_OVFL != 0 |
| 578 | { |
| 579 | // Extended relocations. Read first relocation (which contains extended count) & adjust |
| 580 | // relocations pointer. |
| 581 | let extended_relocation_info = data |
| 582 | .read_at::<pe::ImageRelocation>(pointer) |
| 583 | .read_error("Invalid COFF relocation offset or number" )?; |
| 584 | number = extended_relocation_info.virtual_address.get(LE) as usize; |
| 585 | if number == 0 { |
| 586 | return Err(Error("Invalid COFF relocation number" )); |
| 587 | } |
| 588 | pointer += core::mem::size_of::<pe::ImageRelocation>() as u64; |
| 589 | // Extended relocation info does not contribute to the count of sections. |
| 590 | number -= 1; |
| 591 | } |
| 592 | data.read_slice_at(pointer, number) |
| 593 | .read_error("Invalid COFF relocation offset or number" ) |
| 594 | } |
| 595 | } |
| 596 | |
| 597 | #[cfg (test)] |
| 598 | mod tests { |
| 599 | use super::*; |
| 600 | |
| 601 | #[test ] |
| 602 | fn name_offset() { |
| 603 | let mut section = pe::ImageSectionHeader::default(); |
| 604 | section.name = *b"xxxxxxxx" ; |
| 605 | assert_eq!(section.name_offset(), Ok(None)); |
| 606 | section.name = *b"/0 \0\0\0\0\0\0" ; |
| 607 | assert_eq!(section.name_offset(), Ok(Some(0))); |
| 608 | section.name = *b"/9999999" ; |
| 609 | assert_eq!(section.name_offset(), Ok(Some(999_9999))); |
| 610 | section.name = *b"//AAAAAA" ; |
| 611 | assert_eq!(section.name_offset(), Ok(Some(0))); |
| 612 | section.name = *b"//D/////" ; |
| 613 | assert_eq!(section.name_offset(), Ok(Some(0xffff_ffff))); |
| 614 | section.name = *b"//EAAAAA" ; |
| 615 | assert!(section.name_offset().is_err()); |
| 616 | section.name = *b"////////" ; |
| 617 | assert!(section.name_offset().is_err()); |
| 618 | } |
| 619 | } |
| 620 | |