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Basic TLS with patching + int 0x80

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This commit is contained in:
Stefanos Kornilios Mitsis Poiitidis 2024-01-20 14:29:23 +02:00
parent af18453950
commit 724c56d8aa
2 changed files with 86 additions and 2 deletions
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26
src/common/log.cpp
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@ -19,8 +19,34 @@ void Flush() {
spdlog::details::registry::instance().flush_all();
}
thread_local uint8_t TLS[1024];
uint64_t tls_access(int64_t tls_offset) {
if (tls_offset == 0) {
return (uint64_t)TLS;
}
}
#ifdef _WIN64
static LONG WINAPI ExceptionHandler(PEXCEPTION_POINTERS pExp) noexcept {
if (*(uint8_t *)pExp->ContextRecord->Rip == 0xcd) {
int reg = *(uint8_t *)(pExp->ContextRecord->Rip + 1) - 0x80;
int sizes = *(uint8_t *)(pExp->ContextRecord->Rip + 2);
int pattern_size = sizes & 0xF;
int imm_size = sizes >> 4;
int64_t tls_offset;
if (imm_size == 4)
tls_offset = *(int32_t *)(pExp->ContextRecord->Rip + pattern_size);
else
tls_offset = *(int64_t *)(pExp->ContextRecord->Rip + pattern_size);
(&pExp->ContextRecord->Rax)[reg] = tls_access(tls_offset); /* TLS_ACCESS */
pExp->ContextRecord->Rip += pattern_size + imm_size;
return EXCEPTION_CONTINUE_EXECUTION;
}
const u32 ec = pExp->ExceptionRecord->ExceptionCode;
switch (ec) {
case EXCEPTION_ACCESS_VIOLATION: {