From f5ab6fb5e8be7b73e6003d4145081d5e0c0ce287 Mon Sep 17 00:00:00 2001 From: Jack <66967891+ASpoonPlaysGames@users.noreply.github.com> Date: Wed, 27 Dec 2023 00:32:01 +0000 Subject: Folder restructuring from primedev (#624) Copies of over the primedev folder structure for easier cherry-picking of further changes Co-authored-by: F1F7Y --- .../exploit_fixes/exploitfixes_utf8parser.cpp | 199 --------------------- 1 file changed, 199 deletions(-) delete mode 100644 NorthstarDLL/shared/exploit_fixes/exploitfixes_utf8parser.cpp (limited to 'NorthstarDLL/shared/exploit_fixes/exploitfixes_utf8parser.cpp') diff --git a/NorthstarDLL/shared/exploit_fixes/exploitfixes_utf8parser.cpp b/NorthstarDLL/shared/exploit_fixes/exploitfixes_utf8parser.cpp deleted file mode 100644 index 3d97f750..00000000 --- a/NorthstarDLL/shared/exploit_fixes/exploitfixes_utf8parser.cpp +++ /dev/null @@ -1,199 +0,0 @@ - -AUTOHOOK_INIT() - -INT64(__fastcall* sub_F1320)(DWORD a1, char* a2); - -// Reimplementation of an exploitable UTF decoding function in titanfall -bool __fastcall CheckUTF8Valid(INT64* a1, DWORD* a2, char* strData) -{ - DWORD v3; // eax - char* v4; // rbx - char v5; // si - char* _strData; // rdi - char* v7; // rbp - char v11; // al - DWORD v12; // er9 - DWORD v13; // ecx - DWORD v14; // edx - DWORD v15; // er8 - int v16; // eax - DWORD v17; // er9 - int v18; // eax - DWORD v19; // er9 - DWORD v20; // ecx - int v21; // eax - int v22; // er9 - DWORD v23; // edx - int v24; // eax - int v25; // er9 - DWORD v26; // er9 - DWORD v27; // er10 - DWORD v28; // ecx - DWORD v29; // edx - DWORD v30; // er8 - int v31; // eax - DWORD v32; // er10 - int v33; // eax - DWORD v34; // er10 - DWORD v35; // ecx - int v36; // eax - int v37; // er10 - DWORD v38; // edx - int v39; // eax - int v40; // er10 - DWORD v41; // er10 - INT64 v43; // r8 - INT64 v44; // rdx - INT64 v45; // rcx - INT64 v46; // rax - INT64 v47; // rax - char v48; // al - INT64 v49; // r8 - INT64 v50; // rdx - INT64 v51; // rcx - INT64 v52; // rax - INT64 v53; // rax - - v3 = a2[2]; - v4 = (char*)(a1[1] + *a2); - v5 = 0; - _strData = strData; - v7 = &v4[*((UINT16*)a2 + 2)]; - if (v3 >= 2) - { - ++v4; - --v7; - if (v3 != 2) - { - while (1) - { - if (!CMemoryAddress(v4).IsMemoryReadable(1)) - return false; // INVALID - - v11 = *v4++; // crash potential - if (v11 != 92) - goto LABEL_6; - v11 = *v4++; - if (v11 == 110) - break; - switch (v11) - { - case 't': - v11 = 9; - goto LABEL_6; - case 'r': - v11 = 13; - goto LABEL_6; - case 'b': - v11 = 8; - goto LABEL_6; - case 'f': - v11 = 12; - goto LABEL_6; - } - if (v11 != 117) - goto LABEL_6; - v12 = *v4 | 0x20; - v13 = v4[1] | 0x20; - v14 = v4[2] | 0x20; - v15 = v4[3] | 0x20; - v16 = 87; - if (v12 <= 0x39) - v16 = 48; - v17 = v12 - v16; - v18 = 87; - v19 = v17 << 12; - if (v13 <= 0x39) - v18 = 48; - v20 = v13 - v18; - v21 = 87; - v22 = (v20 << 8) | v19; - if (v14 <= 0x39) - v21 = 48; - v23 = v14 - v21; - v24 = 87; - v25 = (16 * v23) | v22; - if (v15 <= 0x39) - v24 = 48; - v4 += 4; - v26 = (v15 - v24) | v25; - if (v26 - 55296 <= 0x7FF) - { - if (v26 >= 0xDC00) - return true; - if (*v4 != 92 || v4[1] != 117) - return true; - - v27 = v4[2] | 0x20; - v28 = v4[3] | 0x20; - v29 = v4[4] | 0x20; - v30 = v4[5] | 0x20; - v31 = 87; - if (v27 <= 0x39) - v31 = 48; - v32 = v27 - v31; - v33 = 87; - v34 = v32 << 12; - if (v28 <= 0x39) - v33 = 48; - v35 = v28 - v33; - v36 = 87; - v37 = (v35 << 8) | v34; - if (v29 <= 0x39) - v36 = 48; - v38 = v29 - v36; - v39 = 87; - v40 = (16 * v38) | v37; - if (v30 <= 0x39) - v39 = 48; - v4 += 6; - v41 = ((v30 - v39) | v40) - 56320; - if (v41 > 0x3FF) - return true; - v26 = v41 | ((v26 - 55296) << 10); - } - _strData += (DWORD)sub_F1320(v26, _strData); - LABEL_7: - if (v4 == v7) - goto LABEL_48; - } - v11 = 10; - LABEL_6: - v5 |= v11; - *_strData++ = v11; - goto LABEL_7; - } - } -LABEL_48: - return true; -} - -// prevent utf8 parser from crashing when provided bad data, which can be sent through user-controlled openinvites -// clang-format off -AUTOHOOK(Rson_ParseUTF8, engine.dll + 0xEF670, -bool, __fastcall, (INT64* a1, DWORD* a2, char* strData)) // 48 89 5C 24 ? 48 89 6C 24 ? 48 89 74 24 ? 57 41 54 41 55 41 56 41 57 48 83 EC 20 8B 1A -// clang-format on -{ - static void* targetRetAddr = CModule("engine.dll").FindPattern("84 C0 75 2C 49 8B 16"); - - // only call if we're parsing utf8 data from the network (i.e. communities), otherwise we get perf issues - void* pReturnAddress = -#ifdef _MSC_VER - _ReturnAddress() -#else - __builtin_return_address(0) -#endif - ; - - if (pReturnAddress == targetRetAddr && !CheckUTF8Valid(a1, a2, strData)) - return false; - - return Rson_ParseUTF8(a1, a2, strData); -} - -ON_DLL_LOAD("engine.dll", EngineExploitFixes_UTF8Parser, (CModule module)) -{ - AUTOHOOK_DISPATCH() - - sub_F1320 = module.FindPattern("83 F9 7F 77 08 88 0A").RCast(); -} -- cgit v1.2.3