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functionHooks: fix incorrect protlen calcs

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This commit is contained in:
Vaxry 2023-12-09 16:16:46 +00:00
parent dd0714c22a
commit 9132660768
1 changed files with 6 additions and 3 deletions
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9
src/plugins/HookSystem.cpp
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@ -128,8 +128,11 @@ bool CFunctionHook::hook() {
(uint64_t)((uint8_t*)m_pSource + sizeof(ABSOLUTE_JMP_ADDRESS));
// make jump to hk
mprotect((uint8_t*)m_pSource - ((uint64_t)m_pSource) % sysconf(_SC_PAGE_SIZE), sysconf(_SC_PAGE_SIZE), PROT_READ | PROT_WRITE | PROT_EXEC);
memcpy(m_pSource, ABSOLUTE_JMP_ADDRESS, sizeof(ABSOLUTE_JMP_ADDRESS));
const auto PAGESIZE = sysconf(_SC_PAGE_SIZE);
const uint8_t* PROTSTART = (uint8_t*)m_pSource - ((uint64_t)m_pSource % PAGESIZE);
const size_t PROTLEN = std::ceil((float)(HOOKSIZE + ((uint64_t)m_pSource - (uint64_t)PROTSTART)) / (float)PAGESIZE) * PAGESIZE;
mprotect((uint8_t*)PROTSTART, PROTLEN, PROT_READ | PROT_WRITE | PROT_EXEC);
memcpy((uint8_t*)m_pSource, ABSOLUTE_JMP_ADDRESS, sizeof(ABSOLUTE_JMP_ADDRESS));
// make popq %rax and NOP all remaining
memcpy((uint8_t*)m_pSource + sizeof(ABSOLUTE_JMP_ADDRESS), POP_RAX, sizeof(POP_RAX));
@ -140,7 +143,7 @@ bool CFunctionHook::hook() {
*(uint64_t*)((uint8_t*)m_pSource + ABSOLUTE_JMP_ADDRESS_OFFSET) = (uint64_t)(m_pDestination);
// revert mprot
mprotect((uint8_t*)m_pSource - ((uint64_t)m_pSource) % sysconf(_SC_PAGE_SIZE), sysconf(_SC_PAGE_SIZE), PROT_READ | PROT_EXEC);
mprotect((uint8_t*)PROTSTART, PROTLEN, PROT_READ | PROT_EXEC);
// set original addr to trampo addr
m_pOriginal = m_pTrampolineAddr;