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plugin/hook: disallow multiple hooks per function (#12320)

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this was never safe. After recent changes, it's become even less so. Just disallow it.

ref #11992
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Vaxry 2025-11-16 12:01:48 +00:00 • committed by GitHub
parent b35f78431f
commit 9b006b2c85
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2 changed files with 13 additions and 1 deletions
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10
src/plugins/HookSystem.cpp
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@ -144,6 +144,12 @@ bool CFunctionHook::hook() {
return false;
#endif
if (g_pFunctionHookSystem->m_activeHooks.contains(rc<uint64_t>(m_source))) {
// TODO: return actual error codes...
Debug::log(ERR, "[functionhook] failed, function is already hooked");
return false;
}
// jmp rel32
// offset for relative addr: 1
static constexpr uint8_t RELATIVE_JMP_ADDRESS[] = {0xE9, 0x00, 0x00, 0x00, 0x00};
@ -231,6 +237,8 @@ bool CFunctionHook::hook() {
m_active = true;
m_hookLen = ORIGSIZE;
g_pFunctionHookSystem->m_activeHooks.emplace(rc<uint64_t>(m_source));
return true;
}
@ -243,6 +251,8 @@ bool CFunctionHook::unhook() {
if (!m_active)
return false;
g_pFunctionHookSystem->m_activeHooks.erase(rc<uint64_t>(m_source));
// allow write to src
mprotect(sc<uint8_t*>(m_source) - rc<uint64_t>(m_source) % sysconf(_SC_PAGE_SIZE), sysconf(_SC_PAGE_SIZE), PROT_READ | PROT_WRITE | PROT_EXEC);