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Fix ELF `patch_address` function for object files (.o)

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This commit is contained in:
Romain Thomas 2019-05-20 11:01:40 +02:00
parent 22344e764e
commit 8fb74bec60
1 changed files with 35 additions and 0 deletions
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35
src/ELF/Binary.cpp
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@ -1366,6 +1366,25 @@ Section& Binary::extend(const Section& section, uint64_t size) {
// ===== // =====
void Binary::patch_address(uint64_t address, const std::vector<uint8_t>& patch_value, LIEF::Binary::VA_TYPES) { void Binary::patch_address(uint64_t address, const std::vector<uint8_t>& patch_value, LIEF::Binary::VA_TYPES) {
// Object file does not have segments
if (this->header().file_type() == E_TYPE::ET_REL) {
Section& section = this->section_from_offset(address);
std::vector<uint8_t> content = section.content();
const uint64_t offset = address - section.file_offset();
if ((offset + patch_value.size()) > content.size()) {
content.resize(offset + patch_value.size());
}
std::copy(
std::begin(patch_value),
std::end(patch_value),
content.data() + offset);
section.content(content);
return;
}
// Find the segment associated with the virtual address // Find the segment associated with the virtual address
Segment& segment_topatch = this->segment_from_virtual_address(address); Segment& segment_topatch = this->segment_from_virtual_address(address);
const uint64_t offset = address - segment_topatch.virtual_address(); const uint64_t offset = address - segment_topatch.virtual_address();
@ -1386,6 +1405,22 @@ void Binary::patch_address(uint64_t address, uint64_t patch_value, size_t size,
throw std::runtime_error("Invalid size (" + std::to_string(size) + ")"); throw std::runtime_error("Invalid size (" + std::to_string(size) + ")");
} }
// Object file does not have segments
if (this->header().file_type() == E_TYPE::ET_REL) {
Section& section = this->section_from_offset(address);
std::vector<uint8_t> content = section.content();
const uint64_t offset = address - section.file_offset();
// TODO: Handle Endiness
std::copy(
reinterpret_cast<uint8_t*>(&patch_value),
reinterpret_cast<uint8_t*>(&patch_value) + size,
content.data() + offset);
section.content(content);
return;
}
Segment& segment_topatch = this->segment_from_virtual_address(address); Segment& segment_topatch = this->segment_from_virtual_address(address);
const uint64_t offset = address - segment_topatch.virtual_address(); const uint64_t offset = address - segment_topatch.virtual_address();
std::vector<uint8_t> content = segment_topatch.content(); std::vector<uint8_t> content = segment_topatch.content();