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Finalizer minimal ipin disassembly

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York Jasper Niebuhr 2025-10-27 21:04:20 +01:00
parent a7382f9efe
commit 17596aff05
1 changed files with 55 additions and 6 deletions
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61
finalize/finalize.cpp
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@ -15,6 +15,8 @@ Notes:
To begin with, anonymous types are not allowed for randomization (later solved with hash(type) instead of name)! To begin with, anonymous types are not allowed for randomization (later solved with hash(type) instead of name)!
*/ */
static bool disassemble_ipin(const LIEF::ELF::Section* text, IPIN::HIT& pin);
int main(int argc, char** argv) { int main(int argc, char** argv) {
static option long_options[] = { static option long_options[] = {
{ "help", no_argument, 0, 0 }, { "help", no_argument, 0, 0 },
@ -94,16 +96,63 @@ int main(int argc, char** argv) {
return 1; return 1;
} }
// For each ipin, disassemble instruction and find immediate offset
const LIEF::ELF::Section* text = bin->get_section(".text");
if (!text) {
std::cerr << "Unable to locate .text section for ipin disassembly!" << std::endl;
return 1;
}
for (auto& [cu_uid, cu] : units) {
for (auto& [_, ipin] : cu.ipins) {
if (!ipin.hit.has_value()) {
std::cerr << "Encountered ipin without vaddr!" << std::endl;
return 1;
}
if (!disassemble_ipin(text, ipin.hit.value())) {
std::cerr << "Failed to disassemble ipin!" << std::endl;
return 1;
}
}
}
// TODO // TODO
/* /*
1. For each ipin, disassemble instruction and find immediate offset 1. Find __spslr_program
2. Find __spslr_program 2. Serialize entire patcher program
3. Serialize entire patcher program
-> all pin addresses relative to &__spslr_program -> all pin addresses relative to &__spslr_program
-> dpatch entry components ordered by level -> dpatch entry components ordered by level
4. Add new section .spslr with patcher program 3. Add new section .spslr with patcher program
5. Set __spslr_program to (&.spslr - &__spslr_program) 4. Set __spslr_program to (&.spslr - &__spslr_program)
6. Output final program 5. Output final program
*/ */
} }
bool disassemble_ipin(const LIEF::ELF::Section* text, IPIN::HIT& pin) {
if (!text)
return false;
uint64_t text_begin = text->virtual_address();
uint64_t text_size = text->size();
auto text_data = text->content();
uint64_t pin_addr = pin.vaddr;
if (pin_addr < text_begin || pin_addr >= text_begin + text_size)
return false;
uint64_t pin_offset = pin_addr - text_begin;
// 32 bit mov of immediate to 64 bit register: 0x48 0xc7 [8 bit reg] [32 bit immediate]
if (text_data[pin_offset] != 0x48 || text_data[pin_offset + 1] != 0xc7) {
std::cerr << "Ipin uses not yet handled instruction!" << std::endl;
return false;
}
pin.imm_offset = 3;
pin.imm_size = 4;
return true;
}