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|
use object::{build, elf};
// Test that offset 0 is supported for SHT_NOBITS sections.
#[test]
fn test_nobits_offset() {
let mut builder = build::elf::Builder::new(object::Endianness::Little, true);
builder.header.e_type = elf::ET_EXEC;
builder.header.e_phoff = 0x40;
let section = builder.sections.add();
section.name = b".shstrtab"[..].into();
section.sh_type = elf::SHT_STRTAB;
section.data = build::elf::SectionData::SectionString;
let section = builder.sections.add();
section.name = b".bss"[..].into();
section.sh_type = elf::SHT_NOBITS;
section.sh_flags = (elf::SHF_ALLOC | elf::SHF_WRITE) as u64;
section.sh_addr = 0x1000;
section.sh_offset = 0;
section.sh_size = 0x1000;
section.sh_addralign = 16;
section.data = build::elf::SectionData::UninitializedData(0x1000);
let section_id = section.id();
let segment = builder.segments.add();
segment.p_type = elf::PT_LOAD;
segment.p_flags = elf::PF_R | elf::PF_W;
segment.p_offset = 0x1000;
segment.p_vaddr = 0x1000;
segment.p_paddr = 0x1000;
segment.p_filesz = 0;
segment.p_memsz = 0x1000;
segment.p_align = 16;
segment.sections.push(section_id);
let mut buf = Vec::new();
builder.write(&mut buf).unwrap();
}
// Test that we can read and write a file with no dynamic string table.
#[test]
fn test_no_dynstr() {
let mut builder = build::elf::Builder::new(object::Endianness::Little, true);
builder.header.e_type = elf::ET_EXEC;
builder.header.e_machine = elf::EM_X86_64;
builder.header.e_phoff = 0x40;
let section = builder.sections.add();
section.name = b".shstrtab"[..].into();
section.sh_type = elf::SHT_STRTAB;
section.data = build::elf::SectionData::SectionString;
let section = builder.sections.add();
section.name = b".dynsym"[..].into();
section.sh_type = elf::SHT_DYNSYM;
section.sh_flags = elf::SHF_ALLOC as u64;
section.sh_addralign = 8;
section.data = build::elf::SectionData::DynamicSymbol;
let dynsym_id = section.id();
let section = builder.sections.add();
section.name = b".rela.dyn"[..].into();
section.sh_type = elf::SHT_RELA;
section.sh_flags = elf::SHF_ALLOC as u64;
section.sh_addralign = 8;
section.data =
build::elf::SectionData::DynamicRelocation(vec![build::elf::DynamicRelocation {
r_offset: 0x1000,
symbol: None,
r_type: elf::R_X86_64_64,
r_addend: 0x300,
}]);
let rela_id = section.id();
builder.set_section_sizes();
let segment = builder.segments.add();
segment.p_type = elf::PT_LOAD;
segment.p_flags = elf::PF_R;
segment.p_filesz = 0x1000;
segment.p_memsz = 0x1000;
segment.p_align = 8;
segment.append_section(builder.sections.get_mut(dynsym_id));
segment.append_section(builder.sections.get_mut(rela_id));
let mut buf = Vec::new();
builder.write(&mut buf).unwrap();
let builder = build::elf::Builder::read(&*buf).unwrap();
assert_eq!(builder.sections.count(), 3);
assert_eq!(builder.segments.count(), 1);
for section in &builder.sections {
match §ion.data {
build::elf::SectionData::DynamicSymbol => {
assert_eq!(section.sh_offset, 0x1000);
}
build::elf::SectionData::DynamicRelocation(rela) => {
assert_eq!(section.sh_offset, 0x1018);
assert_eq!(rela.len(), 1);
}
_ => {}
}
}
}
#[test]
fn test_attribute() {
let mut builder = build::elf::Builder::new(object::Endianness::Little, true);
builder.header.e_type = elf::ET_EXEC;
builder.header.e_machine = elf::EM_X86_64;
builder.header.e_phoff = 0x40;
let section = builder.sections.add();
section.name = b".shstrtab"[..].into();
section.sh_type = elf::SHT_STRTAB;
section.data = build::elf::SectionData::SectionString;
let attributes = build::elf::AttributesSection {
subsections: vec![build::elf::AttributesSubsection {
vendor: b"GNU"[..].into(),
subsubsections: vec![
(build::elf::AttributesSubsubsection {
tag: build::elf::AttributeTag::File,
data: b"123"[..].into(),
}),
],
}],
};
let section = builder.sections.add();
section.name = b".gnu.attributes"[..].into();
section.sh_type = elf::SHT_GNU_ATTRIBUTES;
section.sh_addralign = 8;
section.data = build::elf::SectionData::Attributes(attributes);
let mut buf = Vec::new();
builder.write(&mut buf).unwrap();
let builder = build::elf::Builder::read(&*buf).unwrap();
assert_eq!(builder.sections.count(), 2);
for section in &builder.sections {
if let build::elf::SectionData::Attributes(attributes) = §ion.data {
assert_eq!(attributes.subsections.len(), 1);
assert_eq!(attributes.subsections[0].vendor.as_slice(), b"GNU");
assert_eq!(attributes.subsections[0].subsubsections.len(), 1);
assert_eq!(
attributes.subsections[0].subsubsections[0].tag,
build::elf::AttributeTag::File
);
assert_eq!(
attributes.subsections[0].subsubsections[0].data.as_slice(),
b"123"
);
}
}
}
#[test]
fn test_dynsym() {
let mut builder = build::elf::Builder::new(object::Endianness::Little, true);
builder.header.e_type = elf::ET_EXEC;
builder.header.e_machine = elf::EM_X86_64;
builder.header.e_phoff = 0x40;
let section = builder.sections.add();
section.name = b".shstrtab"[..].into();
section.sh_type = elf::SHT_STRTAB;
section.data = build::elf::SectionData::SectionString;
let section = builder.sections.add();
section.name = b".text"[..].into();
section.sh_type = elf::SHT_PROGBITS;
section.sh_flags = (elf::SHF_ALLOC | elf::SHF_EXECINSTR) as u64;
section.sh_addralign = 16;
section.data = build::elf::SectionData::Data(vec![0xcc; 100].into());
let text_id = section.id();
let section = builder.sections.add();
section.name = b".dynsym"[..].into();
section.sh_type = elf::SHT_DYNSYM;
section.sh_flags = elf::SHF_ALLOC as u64;
section.sh_addralign = 8;
section.data = build::elf::SectionData::DynamicSymbol;
let dynsym_id = section.id();
let section = builder.sections.add();
section.name = b".dynstr"[..].into();
section.sh_type = elf::SHT_STRTAB;
section.sh_flags = elf::SHF_ALLOC as u64;
section.sh_addralign = 1;
section.data = build::elf::SectionData::DynamicString;
let dynstr_id = section.id();
let section = builder.sections.add();
section.name = b".gnu.hash"[..].into();
section.sh_type = elf::SHT_GNU_HASH;
section.sh_flags = elf::SHF_ALLOC as u64;
section.sh_addralign = 8;
section.data = build::elf::SectionData::GnuHash;
let gnu_hash_id = section.id();
builder.gnu_hash_bloom_shift = 1;
builder.gnu_hash_bloom_count = 1;
builder.gnu_hash_bucket_count = 1;
let symbol = builder.dynamic_symbols.add();
symbol.name = b"global"[..].into();
symbol.set_st_info(elf::STB_GLOBAL, elf::STT_FUNC);
symbol.section = Some(text_id);
let symbol = builder.dynamic_symbols.add();
symbol.name = b"undefined"[..].into();
symbol.set_st_info(elf::STB_GLOBAL, elf::STT_NOTYPE);
let symbol = builder.dynamic_symbols.add();
symbol.name = b"local"[..].into();
symbol.set_st_info(elf::STB_LOCAL, elf::STT_FUNC);
symbol.section = Some(text_id);
builder.set_section_sizes();
let segment = builder.segments.add();
segment.p_type = elf::PT_LOAD;
segment.p_flags = elf::PF_R;
segment.p_filesz = 0x1000;
segment.p_memsz = 0x1000;
segment.p_align = 8;
segment.append_section(builder.sections.get_mut(text_id));
segment.append_section(builder.sections.get_mut(dynsym_id));
segment.append_section(builder.sections.get_mut(dynstr_id));
segment.append_section(builder.sections.get_mut(gnu_hash_id));
let mut buf = Vec::new();
builder.write(&mut buf).unwrap();
let builder = build::elf::Builder::read(&*buf).unwrap();
assert_eq!(builder.sections.count(), 5);
assert_eq!(builder.dynamic_symbols.count(), 3);
// Check that the dynamic symbol table sorting handles
// local and undefined symbols correctly.
assert_eq!(
builder
.dynamic_symbols
.iter()
.map(|s| s.name.as_slice())
.collect::<Vec<_>>(),
vec![&b"local"[..], &b"undefined"[..], &b"global"[..]]
);
for section in &builder.sections {
if let build::elf::SectionData::DynamicSymbol = §ion.data {
// Check that sh_info includes the number of local symbols.
assert_eq!(section.sh_info, 2);
}
}
}
|
