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use core::fmt::Debug;
use core::{iter, mem, slice, str};
use crate::elf;
use crate::endian::{self, Endianness, U32Bytes};
use crate::pod::Pod;
use crate::read::{
self, Bytes, CompressedData, CompressedFileRange, CompressionFormat, Error, ObjectSection,
ReadError, ReadRef, SectionFlags, SectionIndex, SectionKind, StringTable,
};
use super::{
AttributesSection, CompressionHeader, ElfFile, ElfSectionRelocationIterator, FileHeader,
GnuHashTable, HashTable, NoteIterator, RelocationSections, SymbolTable, VerdefIterator,
VerneedIterator, VersionTable,
};
/// The table of section headers in an ELF file.
///
/// Also includes the string table used for the section names.
#[derive(Debug, Default, Clone, Copy)]
pub struct SectionTable<'data, Elf: FileHeader, R = &'data [u8]>
where
R: ReadRef<'data>,
{
sections: &'data [Elf::SectionHeader],
strings: StringTable<'data, R>,
}
impl<'data, Elf: FileHeader, R: ReadRef<'data>> SectionTable<'data, Elf, R> {
/// Create a new section table.
#[inline]
pub fn new(sections: &'data [Elf::SectionHeader], strings: StringTable<'data, R>) -> Self {
SectionTable { sections, strings }
}
/// Iterate over the section headers.
#[inline]
pub fn iter(&self) -> slice::Iter<'data, Elf::SectionHeader> {
self.sections.iter()
}
/// Return true if the section table is empty.
#[inline]
pub fn is_empty(&self) -> bool {
self.sections.is_empty()
}
/// The number of section headers.
#[inline]
pub fn len(&self) -> usize {
self.sections.len()
}
/// Return the section header at the given index.
pub fn section(&self, index: SectionIndex) -> read::Result<&'data Elf::SectionHeader> {
self.sections
.get(index.0)
.read_error("Invalid ELF section index")
}
/// Return the section header with the given name.
///
/// Ignores sections with invalid names.
pub fn section_by_name(
&self,
endian: Elf::Endian,
name: &[u8],
) -> Option<(usize, &'data Elf::SectionHeader)> {
self.sections
.iter()
.enumerate()
.find(|(_, section)| self.section_name(endian, section) == Ok(name))
}
/// Return the section name for the given section header.
pub fn section_name(
&self,
endian: Elf::Endian,
section: &'data Elf::SectionHeader,
) -> read::Result<&'data [u8]> {
section.name(endian, self.strings)
}
/// Return the string table at the given section index.
///
/// Returns an error if the section is not a string table.
#[inline]
pub fn strings(
&self,
endian: Elf::Endian,
data: R,
index: SectionIndex,
) -> read::Result<StringTable<'data, R>> {
self.section(index)?
.strings(endian, data)?
.read_error("Invalid ELF string section type")
}
/// Return the symbol table of the given section type.
///
/// Returns an empty symbol table if the symbol table does not exist.
#[inline]
pub fn symbols(
&self,
endian: Elf::Endian,
data: R,
sh_type: u32,
) -> read::Result<SymbolTable<'data, Elf, R>> {
debug_assert!(sh_type == elf::SHT_DYNSYM || sh_type == elf::SHT_SYMTAB);
let (index, section) = match self
.iter()
.enumerate()
.find(|s| s.1.sh_type(endian) == sh_type)
{
Some(s) => s,
None => return Ok(SymbolTable::default()),
};
SymbolTable::parse(endian, data, self, SectionIndex(index), section)
}
/// Return the symbol table at the given section index.
///
/// Returns an error if the section is not a symbol table.
#[inline]
pub fn symbol_table_by_index(
&self,
endian: Elf::Endian,
data: R,
index: SectionIndex,
) -> read::Result<SymbolTable<'data, Elf, R>> {
let section = self.section(index)?;
match section.sh_type(endian) {
elf::SHT_DYNSYM | elf::SHT_SYMTAB => {}
_ => return Err(Error("Invalid ELF symbol table section type")),
}
SymbolTable::parse(endian, data, self, index, section)
}
/// Create a mapping from section index to associated relocation sections.
#[inline]
pub fn relocation_sections(
&self,
endian: Elf::Endian,
symbol_section: SectionIndex,
) -> read::Result<RelocationSections> {
RelocationSections::parse(endian, self, symbol_section)
}
/// Return the contents of a dynamic section.
///
/// Also returns the linked string table index.
///
/// Returns `Ok(None)` if there is no `SHT_DYNAMIC` section.
/// Returns `Err` for invalid values.
pub fn dynamic(
&self,
endian: Elf::Endian,
data: R,
) -> read::Result<Option<(&'data [Elf::Dyn], SectionIndex)>> {
for section in self.sections {
if let Some(dynamic) = section.dynamic(endian, data)? {
return Ok(Some(dynamic));
}
}
Ok(None)
}
/// Return the header of a SysV hash section.
///
/// Returns `Ok(None)` if there is no SysV GNU hash section.
/// Returns `Err` for invalid values.
pub fn hash_header(
&self,
endian: Elf::Endian,
data: R,
) -> read::Result<Option<&'data elf::HashHeader<Elf::Endian>>> {
for section in self.sections {
if let Some(hash) = section.hash_header(endian, data)? {
return Ok(Some(hash));
}
}
Ok(None)
}
/// Return the contents of a SysV hash section.
///
/// Also returns the linked symbol table index.
///
/// Returns `Ok(None)` if there is no SysV hash section.
/// Returns `Err` for invalid values.
pub fn hash(
&self,
endian: Elf::Endian,
data: R,
) -> read::Result<Option<(HashTable<'data, Elf>, SectionIndex)>> {
for section in self.sections {
if let Some(hash) = section.hash(endian, data)? {
return Ok(Some(hash));
}
}
Ok(None)
}
/// Return the header of a GNU hash section.
///
/// Returns `Ok(None)` if there is no GNU hash section.
/// Returns `Err` for invalid values.
pub fn gnu_hash_header(
&self,
endian: Elf::Endian,
data: R,
) -> read::Result<Option<&'data elf::GnuHashHeader<Elf::Endian>>> {
for section in self.sections {
if let Some(hash) = section.gnu_hash_header(endian, data)? {
return Ok(Some(hash));
}
}
Ok(None)
}
/// Return the contents of a GNU hash section.
///
/// Also returns the linked symbol table index.
///
/// Returns `Ok(None)` if there is no GNU hash section.
/// Returns `Err` for invalid values.
pub fn gnu_hash(
&self,
endian: Elf::Endian,
data: R,
) -> read::Result<Option<(GnuHashTable<'data, Elf>, SectionIndex)>> {
for section in self.sections {
if let Some(hash) = section.gnu_hash(endian, data)? {
return Ok(Some(hash));
}
}
Ok(None)
}
/// Return the contents of a `SHT_GNU_VERSYM` section.
///
/// Also returns the linked symbol table index.
///
/// Returns `Ok(None)` if there is no `SHT_GNU_VERSYM` section.
/// Returns `Err` for invalid values.
pub fn gnu_versym(
&self,
endian: Elf::Endian,
data: R,
) -> read::Result<Option<(&'data [elf::Versym<Elf::Endian>], SectionIndex)>> {
for section in self.sections {
if let Some(syms) = section.gnu_versym(endian, data)? {
return Ok(Some(syms));
}
}
Ok(None)
}
/// Return the contents of a `SHT_GNU_VERDEF` section.
///
/// Also returns the linked string table index.
///
/// Returns `Ok(None)` if there is no `SHT_GNU_VERDEF` section.
/// Returns `Err` for invalid values.
pub fn gnu_verdef(
&self,
endian: Elf::Endian,
data: R,
) -> read::Result<Option<(VerdefIterator<'data, Elf>, SectionIndex)>> {
for section in self.sections {
if let Some(defs) = section.gnu_verdef(endian, data)? {
return Ok(Some(defs));
}
}
Ok(None)
}
/// Return the contents of a `SHT_GNU_VERNEED` section.
///
/// Also returns the linked string table index.
///
/// Returns `Ok(None)` if there is no `SHT_GNU_VERNEED` section.
/// Returns `Err` for invalid values.
pub fn gnu_verneed(
&self,
endian: Elf::Endian,
data: R,
) -> read::Result<Option<(VerneedIterator<'data, Elf>, SectionIndex)>> {
for section in self.sections {
if let Some(needs) = section.gnu_verneed(endian, data)? {
return Ok(Some(needs));
}
}
Ok(None)
}
/// Returns the symbol version table.
///
/// Returns `Ok(None)` if there is no `SHT_GNU_VERSYM` section.
/// Returns `Err` for invalid values.
pub fn versions(
&self,
endian: Elf::Endian,
data: R,
) -> read::Result<Option<VersionTable<'data, Elf>>> {
let (versyms, link) = match self.gnu_versym(endian, data)? {
Some(val) => val,
None => return Ok(None),
};
let strings = self.symbol_table_by_index(endian, data, link)?.strings();
// TODO: check links?
let verdefs = self.gnu_verdef(endian, data)?.map(|x| x.0);
let verneeds = self.gnu_verneed(endian, data)?.map(|x| x.0);
VersionTable::parse(endian, versyms, verdefs, verneeds, strings).map(Some)
}
}
/// An iterator over the sections of an `ElfFile32`.
pub type ElfSectionIterator32<'data, 'file, Endian = Endianness, R = &'data [u8]> =
ElfSectionIterator<'data, 'file, elf::FileHeader32<Endian>, R>;
/// An iterator over the sections of an `ElfFile64`.
pub type ElfSectionIterator64<'data, 'file, Endian = Endianness, R = &'data [u8]> =
ElfSectionIterator<'data, 'file, elf::FileHeader64<Endian>, R>;
/// An iterator over the sections of an `ElfFile`.
#[derive(Debug)]
pub struct ElfSectionIterator<'data, 'file, Elf, R = &'data [u8]>
where
Elf: FileHeader,
R: ReadRef<'data>,
{
pub(super) file: &'file ElfFile<'data, Elf, R>,
pub(super) iter: iter::Enumerate<slice::Iter<'data, Elf::SectionHeader>>,
}
impl<'data, 'file, Elf, R> Iterator for ElfSectionIterator<'data, 'file, Elf, R>
where
Elf: FileHeader,
R: ReadRef<'data>,
{
type Item = ElfSection<'data, 'file, Elf, R>;
fn next(&mut self) -> Option<Self::Item> {
self.iter.next().map(|(index, section)| ElfSection {
index: SectionIndex(index),
file: self.file,
section,
})
}
}
/// A section of an `ElfFile32`.
pub type ElfSection32<'data, 'file, Endian = Endianness, R = &'data [u8]> =
ElfSection<'data, 'file, elf::FileHeader32<Endian>, R>;
/// A section of an `ElfFile64`.
pub type ElfSection64<'data, 'file, Endian = Endianness, R = &'data [u8]> =
ElfSection<'data, 'file, elf::FileHeader64<Endian>, R>;
/// A section of an `ElfFile`.
#[derive(Debug)]
pub struct ElfSection<'data, 'file, Elf, R = &'data [u8]>
where
Elf: FileHeader,
R: ReadRef<'data>,
{
pub(super) file: &'file ElfFile<'data, Elf, R>,
pub(super) index: SectionIndex,
pub(super) section: &'data Elf::SectionHeader,
}
impl<'data, 'file, Elf: FileHeader, R: ReadRef<'data>> ElfSection<'data, 'file, Elf, R> {
fn bytes(&self) -> read::Result<&'data [u8]> {
self.section
.data(self.file.endian, self.file.data)
.read_error("Invalid ELF section size or offset")
}
fn maybe_compressed(&self) -> read::Result<Option<CompressedFileRange>> {
let endian = self.file.endian;
if let Some((header, offset, compressed_size)) =
self.section.compression(endian, self.file.data)?
{
let format = match header.ch_type(endian) {
elf::ELFCOMPRESS_ZLIB => CompressionFormat::Zlib,
elf::ELFCOMPRESS_ZSTD => CompressionFormat::Zstandard,
_ => return Err(Error("Unsupported ELF compression type")),
};
let uncompressed_size = header.ch_size(endian).into();
Ok(Some(CompressedFileRange {
format,
offset,
compressed_size,
uncompressed_size,
}))
} else {
Ok(None)
}
}
/// Try GNU-style "ZLIB" header decompression.
fn maybe_compressed_gnu(&self) -> read::Result<Option<CompressedFileRange>> {
let name = match self.name() {
Ok(name) => name,
// I think it's ok to ignore this error?
Err(_) => return Ok(None),
};
if !name.starts_with(".zdebug_") {
return Ok(None);
}
let (section_offset, section_size) = self
.section
.file_range(self.file.endian)
.read_error("Invalid ELF GNU compressed section type")?;
let mut offset = section_offset;
let data = self.file.data;
// Assume ZLIB-style uncompressed data is no more than 4GB to avoid accidentally
// huge allocations. This also reduces the chance of accidentally matching on a
// .debug_str that happens to start with "ZLIB".
if data
.read_bytes(&mut offset, 8)
.read_error("ELF GNU compressed section is too short")?
!= b"ZLIB\0\0\0\0"
{
return Err(Error("Invalid ELF GNU compressed section header"));
}
let uncompressed_size = data
.read::<U32Bytes<_>>(&mut offset)
.read_error("ELF GNU compressed section is too short")?
.get(endian::BigEndian)
.into();
let compressed_size = section_size
.checked_sub(offset - section_offset)
.read_error("ELF GNU compressed section is too short")?;
Ok(Some(CompressedFileRange {
format: CompressionFormat::Zlib,
offset,
compressed_size,
uncompressed_size,
}))
}
}
impl<'data, 'file, Elf, R> read::private::Sealed for ElfSection<'data, 'file, Elf, R>
where
Elf: FileHeader,
R: ReadRef<'data>,
{
}
impl<'data, 'file, Elf, R> ObjectSection<'data> for ElfSection<'data, 'file, Elf, R>
where
Elf: FileHeader,
R: ReadRef<'data>,
{
type RelocationIterator = ElfSectionRelocationIterator<'data, 'file, Elf, R>;
#[inline]
fn index(&self) -> SectionIndex {
self.index
}
#[inline]
fn address(&self) -> u64 {
self.section.sh_addr(self.file.endian).into()
}
#[inline]
fn size(&self) -> u64 {
self.section.sh_size(self.file.endian).into()
}
#[inline]
fn align(&self) -> u64 {
self.section.sh_addralign(self.file.endian).into()
}
#[inline]
fn file_range(&self) -> Option<(u64, u64)> {
self.section.file_range(self.file.endian)
}
#[inline]
fn data(&self) -> read::Result<&'data [u8]> {
self.bytes()
}
fn data_range(&self, address: u64, size: u64) -> read::Result<Option<&'data [u8]>> {
Ok(read::util::data_range(
self.bytes()?,
self.address(),
address,
size,
))
}
fn compressed_file_range(&self) -> read::Result<CompressedFileRange> {
Ok(if let Some(data) = self.maybe_compressed()? {
data
} else if let Some(data) = self.maybe_compressed_gnu()? {
data
} else {
CompressedFileRange::none(self.file_range())
})
}
fn compressed_data(&self) -> read::Result<CompressedData<'data>> {
self.compressed_file_range()?.data(self.file.data)
}
fn name_bytes(&self) -> read::Result<&[u8]> {
self.file
.sections
.section_name(self.file.endian, self.section)
}
fn name(&self) -> read::Result<&str> {
let name = self.name_bytes()?;
str::from_utf8(name)
.ok()
.read_error("Non UTF-8 ELF section name")
}
#[inline]
fn segment_name_bytes(&self) -> read::Result<Option<&[u8]>> {
Ok(None)
}
#[inline]
fn segment_name(&self) -> read::Result<Option<&str>> {
Ok(None)
}
fn kind(&self) -> SectionKind {
let flags = self.section.sh_flags(self.file.endian).into();
let sh_type = self.section.sh_type(self.file.endian);
match sh_type {
elf::SHT_PROGBITS => {
if flags & u64::from(elf::SHF_ALLOC) != 0 {
if flags & u64::from(elf::SHF_EXECINSTR) != 0 {
SectionKind::Text
} else if flags & u64::from(elf::SHF_TLS) != 0 {
SectionKind::Tls
} else if flags & u64::from(elf::SHF_WRITE) != 0 {
SectionKind::Data
} else if flags & u64::from(elf::SHF_STRINGS) != 0 {
SectionKind::ReadOnlyString
} else {
SectionKind::ReadOnlyData
}
} else if flags & u64::from(elf::SHF_STRINGS) != 0 {
SectionKind::OtherString
} else {
SectionKind::Other
}
}
elf::SHT_NOBITS => {
if flags & u64::from(elf::SHF_TLS) != 0 {
SectionKind::UninitializedTls
} else {
SectionKind::UninitializedData
}
}
elf::SHT_NOTE => SectionKind::Note,
elf::SHT_NULL
| elf::SHT_SYMTAB
| elf::SHT_STRTAB
| elf::SHT_RELA
| elf::SHT_HASH
| elf::SHT_DYNAMIC
| elf::SHT_REL
| elf::SHT_DYNSYM
| elf::SHT_GROUP => SectionKind::Metadata,
_ => SectionKind::Elf(sh_type),
}
}
fn relocations(&self) -> ElfSectionRelocationIterator<'data, 'file, Elf, R> {
ElfSectionRelocationIterator {
section_index: self.index,
file: self.file,
relocations: None,
}
}
fn flags(&self) -> SectionFlags {
SectionFlags::Elf {
sh_flags: self.section.sh_flags(self.file.endian).into(),
}
}
}
/// A trait for generic access to `SectionHeader32` and `SectionHeader64`.
#[allow(missing_docs)]
pub trait SectionHeader: Debug + Pod {
type Elf: FileHeader<SectionHeader = Self, Endian = Self::Endian, Word = Self::Word>;
type Word: Into<u64>;
type Endian: endian::Endian;
fn sh_name(&self, endian: Self::Endian) -> u32;
fn sh_type(&self, endian: Self::Endian) -> u32;
fn sh_flags(&self, endian: Self::Endian) -> Self::Word;
fn sh_addr(&self, endian: Self::Endian) -> Self::Word;
fn sh_offset(&self, endian: Self::Endian) -> Self::Word;
fn sh_size(&self, endian: Self::Endian) -> Self::Word;
fn sh_link(&self, endian: Self::Endian) -> u32;
fn sh_info(&self, endian: Self::Endian) -> u32;
fn sh_addralign(&self, endian: Self::Endian) -> Self::Word;
fn sh_entsize(&self, endian: Self::Endian) -> Self::Word;
/// Parse the section name from the string table.
fn name<'data, R: ReadRef<'data>>(
&self,
endian: Self::Endian,
strings: StringTable<'data, R>,
) -> read::Result<&'data [u8]> {
strings
.get(self.sh_name(endian))
.read_error("Invalid ELF section name offset")
}
/// Return the offset and size of the section in the file.
///
/// Returns `None` for sections that have no data in the file.
fn file_range(&self, endian: Self::Endian) -> Option<(u64, u64)> {
if self.sh_type(endian) == elf::SHT_NOBITS {
None
} else {
Some((self.sh_offset(endian).into(), self.sh_size(endian).into()))
}
}
/// Return the section data.
///
/// Returns `Ok(&[])` if the section has no data.
/// Returns `Err` for invalid values.
fn data<'data, R: ReadRef<'data>>(
&self,
endian: Self::Endian,
data: R,
) -> read::Result<&'data [u8]> {
if let Some((offset, size)) = self.file_range(endian) {
data.read_bytes_at(offset, size)
.read_error("Invalid ELF section size or offset")
} else {
Ok(&[])
}
}
/// Return the section data as a slice of the given type.
///
/// Allows padding at the end of the data.
/// Returns `Ok(&[])` if the section has no data.
/// Returns `Err` for invalid values, including bad alignment.
fn data_as_array<'data, T: Pod, R: ReadRef<'data>>(
&self,
endian: Self::Endian,
data: R,
) -> read::Result<&'data [T]> {
let mut data = self.data(endian, data).map(Bytes)?;
data.read_slice(data.len() / mem::size_of::<T>())
.read_error("Invalid ELF section size or offset")
}
/// Return the strings in the section.
///
/// Returns `Ok(None)` if the section does not contain strings.
/// Returns `Err` for invalid values.
fn strings<'data, R: ReadRef<'data>>(
&self,
endian: Self::Endian,
data: R,
) -> read::Result<Option<StringTable<'data, R>>> {
if self.sh_type(endian) != elf::SHT_STRTAB {
return Ok(None);
}
let str_offset = self.sh_offset(endian).into();
let str_size = self.sh_size(endian).into();
let str_end = str_offset
.checked_add(str_size)
.read_error("Invalid ELF string section offset or size")?;
Ok(Some(StringTable::new(data, str_offset, str_end)))
}
/// Return the symbols in the section.
///
/// Also finds the linked string table in `sections`.
///
/// `section_index` must be the 0-based index of this section, and is used
/// to find the corresponding extended section index table in `sections`.
///
/// Returns `Ok(None)` if the section does not contain symbols.
/// Returns `Err` for invalid values.
fn symbols<'data, R: ReadRef<'data>>(
&self,
endian: Self::Endian,
data: R,
sections: &SectionTable<'data, Self::Elf, R>,
section_index: SectionIndex,
) -> read::Result<Option<SymbolTable<'data, Self::Elf, R>>> {
let sh_type = self.sh_type(endian);
if sh_type != elf::SHT_SYMTAB && sh_type != elf::SHT_DYNSYM {
return Ok(None);
}
SymbolTable::parse(endian, data, sections, section_index, self).map(Some)
}
/// Return the `Elf::Rel` entries in the section.
///
/// Also returns the linked symbol table index.
///
/// Returns `Ok(None)` if the section does not contain relocations.
/// Returns `Err` for invalid values.
fn rel<'data, R: ReadRef<'data>>(
&self,
endian: Self::Endian,
data: R,
) -> read::Result<Option<(&'data [<Self::Elf as FileHeader>::Rel], SectionIndex)>> {
if self.sh_type(endian) != elf::SHT_REL {
return Ok(None);
}
let rel = self
.data_as_array(endian, data)
.read_error("Invalid ELF relocation section offset or size")?;
let link = SectionIndex(self.sh_link(endian) as usize);
Ok(Some((rel, link)))
}
/// Return the `Elf::Rela` entries in the section.
///
/// Also returns the linked symbol table index.
///
/// Returns `Ok(None)` if the section does not contain relocations.
/// Returns `Err` for invalid values.
fn rela<'data, R: ReadRef<'data>>(
&self,
endian: Self::Endian,
data: R,
) -> read::Result<Option<(&'data [<Self::Elf as FileHeader>::Rela], SectionIndex)>> {
if self.sh_type(endian) != elf::SHT_RELA {
return Ok(None);
}
let rela = self
.data_as_array(endian, data)
.read_error("Invalid ELF relocation section offset or size")?;
let link = SectionIndex(self.sh_link(endian) as usize);
Ok(Some((rela, link)))
}
/// Return entries in a dynamic section.
///
/// Also returns the linked string table index.
///
/// Returns `Ok(None)` if the section type is not `SHT_DYNAMIC`.
/// Returns `Err` for invalid values.
fn dynamic<'data, R: ReadRef<'data>>(
&self,
endian: Self::Endian,
data: R,
) -> read::Result<Option<(&'data [<Self::Elf as FileHeader>::Dyn], SectionIndex)>> {
if self.sh_type(endian) != elf::SHT_DYNAMIC {
return Ok(None);
}
let dynamic = self
.data_as_array(endian, data)
.read_error("Invalid ELF dynamic section offset or size")?;
let link = SectionIndex(self.sh_link(endian) as usize);
Ok(Some((dynamic, link)))
}
/// Return a note iterator for the section data.
///
/// Returns `Ok(None)` if the section does not contain notes.
/// Returns `Err` for invalid values.
fn notes<'data, R: ReadRef<'data>>(
&self,
endian: Self::Endian,
data: R,
) -> read::Result<Option<NoteIterator<'data, Self::Elf>>> {
if self.sh_type(endian) != elf::SHT_NOTE {
return Ok(None);
}
let data = self
.data(endian, data)
.read_error("Invalid ELF note section offset or size")?;
let notes = NoteIterator::new(endian, self.sh_addralign(endian), data)?;
Ok(Some(notes))
}
/// Return the contents of a group section.
///
/// The first value is a `GRP_*` value, and the remaining values
/// are section indices.
///
/// Returns `Ok(None)` if the section does not define a group.
/// Returns `Err` for invalid values.
fn group<'data, R: ReadRef<'data>>(
&self,
endian: Self::Endian,
data: R,
) -> read::Result<Option<(u32, &'data [U32Bytes<Self::Endian>])>> {
if self.sh_type(endian) != elf::SHT_GROUP {
return Ok(None);
}
let mut data = self
.data(endian, data)
.read_error("Invalid ELF group section offset or size")
.map(Bytes)?;
let flag = data
.read::<U32Bytes<_>>()
.read_error("Invalid ELF group section offset or size")?
.get(endian);
let count = data.len() / mem::size_of::<U32Bytes<Self::Endian>>();
let sections = data
.read_slice(count)
.read_error("Invalid ELF group section offset or size")?;
Ok(Some((flag, sections)))
}
/// Return the header of a SysV hash section.
///
/// Returns `Ok(None)` if the section does not contain a SysV hash.
/// Returns `Err` for invalid values.
fn hash_header<'data, R: ReadRef<'data>>(
&self,
endian: Self::Endian,
data: R,
) -> read::Result<Option<&'data elf::HashHeader<Self::Endian>>> {
if self.sh_type(endian) != elf::SHT_HASH {
return Ok(None);
}
let data = self
.data(endian, data)
.read_error("Invalid ELF hash section offset or size")?;
let header = data
.read_at::<elf::HashHeader<Self::Endian>>(0)
.read_error("Invalid hash header")?;
Ok(Some(header))
}
/// Return the contents of a SysV hash section.
///
/// Also returns the linked symbol table index.
///
/// Returns `Ok(None)` if the section does not contain a SysV hash.
/// Returns `Err` for invalid values.
fn hash<'data, R: ReadRef<'data>>(
&self,
endian: Self::Endian,
data: R,
) -> read::Result<Option<(HashTable<'data, Self::Elf>, SectionIndex)>> {
if self.sh_type(endian) != elf::SHT_HASH {
return Ok(None);
}
let data = self
.data(endian, data)
.read_error("Invalid ELF hash section offset or size")?;
let hash = HashTable::parse(endian, data)?;
let link = SectionIndex(self.sh_link(endian) as usize);
Ok(Some((hash, link)))
}
/// Return the header of a GNU hash section.
///
/// Returns `Ok(None)` if the section does not contain a GNU hash.
/// Returns `Err` for invalid values.
fn gnu_hash_header<'data, R: ReadRef<'data>>(
&self,
endian: Self::Endian,
data: R,
) -> read::Result<Option<&'data elf::GnuHashHeader<Self::Endian>>> {
if self.sh_type(endian) != elf::SHT_GNU_HASH {
return Ok(None);
}
let data = self
.data(endian, data)
.read_error("Invalid ELF GNU hash section offset or size")?;
let header = data
.read_at::<elf::GnuHashHeader<Self::Endian>>(0)
.read_error("Invalid GNU hash header")?;
Ok(Some(header))
}
/// Return the contents of a GNU hash section.
///
/// Also returns the linked symbol table index.
///
/// Returns `Ok(None)` if the section does not contain a GNU hash.
/// Returns `Err` for invalid values.
fn gnu_hash<'data, R: ReadRef<'data>>(
&self,
endian: Self::Endian,
data: R,
) -> read::Result<Option<(GnuHashTable<'data, Self::Elf>, SectionIndex)>> {
if self.sh_type(endian) != elf::SHT_GNU_HASH {
return Ok(None);
}
let data = self
.data(endian, data)
.read_error("Invalid ELF GNU hash section offset or size")?;
let hash = GnuHashTable::parse(endian, data)?;
let link = SectionIndex(self.sh_link(endian) as usize);
Ok(Some((hash, link)))
}
/// Return the contents of a `SHT_GNU_VERSYM` section.
///
/// Also returns the linked symbol table index.
///
/// Returns `Ok(None)` if the section type is not `SHT_GNU_VERSYM`.
/// Returns `Err` for invalid values.
fn gnu_versym<'data, R: ReadRef<'data>>(
&self,
endian: Self::Endian,
data: R,
) -> read::Result<Option<(&'data [elf::Versym<Self::Endian>], SectionIndex)>> {
if self.sh_type(endian) != elf::SHT_GNU_VERSYM {
return Ok(None);
}
let versym = self
.data_as_array(endian, data)
.read_error("Invalid ELF GNU versym section offset or size")?;
let link = SectionIndex(self.sh_link(endian) as usize);
Ok(Some((versym, link)))
}
/// Return an iterator for the entries of a `SHT_GNU_VERDEF` section.
///
/// Also returns the linked string table index.
///
/// Returns `Ok(None)` if the section type is not `SHT_GNU_VERDEF`.
/// Returns `Err` for invalid values.
fn gnu_verdef<'data, R: ReadRef<'data>>(
&self,
endian: Self::Endian,
data: R,
) -> read::Result<Option<(VerdefIterator<'data, Self::Elf>, SectionIndex)>> {
if self.sh_type(endian) != elf::SHT_GNU_VERDEF {
return Ok(None);
}
let verdef = self
.data(endian, data)
.read_error("Invalid ELF GNU verdef section offset or size")?;
let link = SectionIndex(self.sh_link(endian) as usize);
Ok(Some((VerdefIterator::new(endian, verdef), link)))
}
/// Return an iterator for the entries of a `SHT_GNU_VERNEED` section.
///
/// Also returns the linked string table index.
///
/// Returns `Ok(None)` if the section type is not `SHT_GNU_VERNEED`.
/// Returns `Err` for invalid values.
fn gnu_verneed<'data, R: ReadRef<'data>>(
&self,
endian: Self::Endian,
data: R,
) -> read::Result<Option<(VerneedIterator<'data, Self::Elf>, SectionIndex)>> {
if self.sh_type(endian) != elf::SHT_GNU_VERNEED {
return Ok(None);
}
let verneed = self
.data(endian, data)
.read_error("Invalid ELF GNU verneed section offset or size")?;
let link = SectionIndex(self.sh_link(endian) as usize);
Ok(Some((VerneedIterator::new(endian, verneed), link)))
}
/// Return the contents of a `SHT_GNU_ATTRIBUTES` section.
///
/// Returns `Ok(None)` if the section type is not `SHT_GNU_ATTRIBUTES`.
/// Returns `Err` for invalid values.
fn gnu_attributes<'data, R: ReadRef<'data>>(
&self,
endian: Self::Endian,
data: R,
) -> read::Result<Option<AttributesSection<'data, Self::Elf>>> {
if self.sh_type(endian) != elf::SHT_GNU_ATTRIBUTES {
return Ok(None);
}
self.attributes(endian, data).map(Some)
}
/// Parse the contents of the section as attributes.
///
/// This function does not check whether section type corresponds
/// to a section that contains attributes.
///
/// Returns `Err` for invalid values.
fn attributes<'data, R: ReadRef<'data>>(
&self,
endian: Self::Endian,
data: R,
) -> read::Result<AttributesSection<'data, Self::Elf>> {
let data = self.data(endian, data)?;
AttributesSection::new(endian, data)
}
/// Parse the compression header if present.
///
/// Returns the header, and the offset and size of the compressed section data
/// in the file.
///
/// Returns `Ok(None)` if the section flags do not have `SHF_COMPRESSED`.
/// Returns `Err` for invalid values.
fn compression<'data, R: ReadRef<'data>>(
&self,
endian: Self::Endian,
data: R,
) -> read::Result<
Option<(
&'data <Self::Elf as FileHeader>::CompressionHeader,
u64,
u64,
)>,
> {
if (self.sh_flags(endian).into() & u64::from(elf::SHF_COMPRESSED)) == 0 {
return Ok(None);
}
let (section_offset, section_size) = self
.file_range(endian)
.read_error("Invalid ELF compressed section type")?;
let mut offset = section_offset;
let header = data
.read::<<Self::Elf as FileHeader>::CompressionHeader>(&mut offset)
.read_error("Invalid ELF compressed section offset")?;
let compressed_size = section_size
.checked_sub(offset - section_offset)
.read_error("Invalid ELF compressed section size")?;
Ok(Some((header, offset, compressed_size)))
}
}
impl<Endian: endian::Endian> SectionHeader for elf::SectionHeader32<Endian> {
type Elf = elf::FileHeader32<Endian>;
type Word = u32;
type Endian = Endian;
#[inline]
fn sh_name(&self, endian: Self::Endian) -> u32 {
self.sh_name.get(endian)
}
#[inline]
fn sh_type(&self, endian: Self::Endian) -> u32 {
self.sh_type.get(endian)
}
#[inline]
fn sh_flags(&self, endian: Self::Endian) -> Self::Word {
self.sh_flags.get(endian)
}
#[inline]
fn sh_addr(&self, endian: Self::Endian) -> Self::Word {
self.sh_addr.get(endian)
}
#[inline]
fn sh_offset(&self, endian: Self::Endian) -> Self::Word {
self.sh_offset.get(endian)
}
#[inline]
fn sh_size(&self, endian: Self::Endian) -> Self::Word {
self.sh_size.get(endian)
}
#[inline]
fn sh_link(&self, endian: Self::Endian) -> u32 {
self.sh_link.get(endian)
}
#[inline]
fn sh_info(&self, endian: Self::Endian) -> u32 {
self.sh_info.get(endian)
}
#[inline]
fn sh_addralign(&self, endian: Self::Endian) -> Self::Word {
self.sh_addralign.get(endian)
}
#[inline]
fn sh_entsize(&self, endian: Self::Endian) -> Self::Word {
self.sh_entsize.get(endian)
}
}
impl<Endian: endian::Endian> SectionHeader for elf::SectionHeader64<Endian> {
type Word = u64;
type Endian = Endian;
type Elf = elf::FileHeader64<Endian>;
#[inline]
fn sh_name(&self, endian: Self::Endian) -> u32 {
self.sh_name.get(endian)
}
#[inline]
fn sh_type(&self, endian: Self::Endian) -> u32 {
self.sh_type.get(endian)
}
#[inline]
fn sh_flags(&self, endian: Self::Endian) -> Self::Word {
self.sh_flags.get(endian)
}
#[inline]
fn sh_addr(&self, endian: Self::Endian) -> Self::Word {
self.sh_addr.get(endian)
}
#[inline]
fn sh_offset(&self, endian: Self::Endian) -> Self::Word {
self.sh_offset.get(endian)
}
#[inline]
fn sh_size(&self, endian: Self::Endian) -> Self::Word {
self.sh_size.get(endian)
}
#[inline]
fn sh_link(&self, endian: Self::Endian) -> u32 {
self.sh_link.get(endian)
}
#[inline]
fn sh_info(&self, endian: Self::Endian) -> u32 {
self.sh_info.get(endian)
}
#[inline]
fn sh_addralign(&self, endian: Self::Endian) -> Self::Word {
self.sh_addralign.get(endian)
}
#[inline]
fn sh_entsize(&self, endian: Self::Endian) -> Self::Word {
self.sh_entsize.get(endian)
}
}