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mirror of https://gitgud.io/yuv420p10le/plexmediaserver_crack synced 2025-12-30 22:20:28 +00:00
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Applied various improvements, and removed MinHook as a dependency.

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* `rax` is no longer overwritten on Linux.
* Absolute jumps are now used on both platforms, rather than MinHook.
* The Windows code now performs page access checks.
* The signature scanner now works as intended up to the last byte.
This commit is contained in:
yuv420p10le
2024-05-24 00:57:13 +03:00
parent c849f21e16
commit aa20f082e2
2 changed files with 63 additions and 25 deletions
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24
linux/hook.cpp
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@@ -18,7 +18,6 @@ bool get_dottext_info(uintptr_t& start, uintptr_t& end)
// Only .text should have `r-xp`. This works I guess..
if(line.find("Plex Media Server") != std::string::npos && line.find("r-xp") != std::string::npos)
{
auto range = line.substr(0, line.find(' '));
start = std::stoull(line.substr(0, line.find('-')), nullptr, 16);
end = std::stoull(line.substr(line.find('-') + 1), nullptr, 16);
@@ -59,21 +58,25 @@ uintptr_t sig_scan(const uintptr_t start, const uintptr_t end, std::string_view
const auto vec_length = pattern_vec.size();
for(uintptr_t i = start; i < end; i++)
for(uintptr_t i = start; i <= end - vec_length; i++)
{
bool mismatch = false;
for(uintptr_t x = 0; x < vec_length; x++)
{
const auto mem = *reinterpret_cast<uint8_t*>(i + x);
if(pattern_vec[x] != WILDCARD && mem != pattern_vec[x])
{
mismatch = true;
break;
}
}
else if(x == vec_length - 1)
{
return i;
}
if(!mismatch)
{
return i;
}
}
@@ -107,14 +110,11 @@ void hook()
// Jumps to specified address
uint8_t shellcode[] =
{
0x48, 0xB8, // movq rax, ?
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x50, // push rax
0xC3 // ret
0xFF, 0x25, 0x00, 0x00, 0x00, 0x00, // jmp [rip+0x06]
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 // ?
};
*reinterpret_cast<decltype(&hook_is_feature_available)*>(&shellcode[2]) = &hook_is_feature_available;
*reinterpret_cast<decltype(&hook_is_feature_available)*>(&shellcode[6]) = &hook_is_feature_available;
mprotect(reinterpret_cast<void*>(_is_feature_available), sizeof(shellcode), PROT_READ|PROT_WRITE|PROT_EXEC);
memcpy(reinterpret_cast<void*>(_is_feature_available), shellcode, sizeof(shellcode));