FWGS
/
xash3d-fwgs
mirror of https://github.com/FWGS/xash3d-fwgs
2
0
Fork 0
Code Issues 2 Projects Releases Wiki Activity

platform: win32: fixed crashes in COM_CheckLibraryDirectDependency

This commit is contained in:
SNMetamorph 2021-02-23 00:24:29 +04:00 committed by Alibek Omarov
parent 256284d76f
commit 56d5f08128
1 changed files with 29 additions and 15 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

44
engine/platform/win32/lib_win.c
View File

@ -673,6 +673,22 @@ library_error:
return NULL;
}
static DWORD GetOffsetByRVA( DWORD rva, PIMAGE_NT_HEADERS nt_header )
{
int i = 0;
PIMAGE_SECTION_HEADER sect_header = IMAGE_FIRST_SECTION( nt_header );
if (!rva)
return rva;
for( i = 0; i < nt_header->FileHeader.NumberOfSections; i++, sect_header++)
{
if( rva >= sect_header->VirtualAddress && rva < sect_header->VirtualAddress + sect_header->Misc.VirtualSize )
break;
}
return (rva - sect_header->VirtualAddress + sect_header->PointerToRawData);
}
/*
---------------------------------------------------------------
@ -958,12 +974,12 @@ table_error:
qboolean COM_CheckLibraryDirectDependency( const char *name, const char *depname, qboolean directpath )
{
PIMAGE_DOS_HEADER dos_header;
PIMAGE_NT_HEADERS old_header;
PIMAGE_DATA_DIRECTORY directory;
PIMAGE_DOS_HEADER dosHeader;
PIMAGE_NT_HEADERS peHeader;
PIMAGE_DATA_DIRECTORY importDir;
PIMAGE_IMPORT_DESCRIPTOR importDesc;
string errorstring = "";
void *data = NULL;
byte *data = NULL;
dll_user_t *hInst;
hInst = FS_FindLibrary( name, directpath );
@ -979,33 +995,31 @@ qboolean COM_CheckLibraryDirectDependency( const char *name, const char *depname
goto libraryerror;
}
dos_header = ( PIMAGE_DOS_HEADER )data;
if( dos_header->e_magic != IMAGE_DOS_SIGNATURE )
dosHeader = ( PIMAGE_DOS_HEADER )data;
if( dosHeader->e_magic != IMAGE_DOS_SIGNATURE )
{
Q_snprintf( errorstring, sizeof( errorstring ), "%s it's not a valid executable file", name );
goto libraryerror;
}
old_header = ( PIMAGE_NT_HEADERS )&( ( const byte * )( data ) )[dos_header->e_lfanew];
if( old_header->Signature != IMAGE_NT_SIGNATURE )
peHeader = ( PIMAGE_NT_HEADERS )(data + dosHeader->e_lfanew);
if( peHeader->Signature != IMAGE_NT_SIGNATURE )
{
Q_snprintf( errorstring, sizeof( errorstring ), "%s missing PE header", name );
goto libraryerror;
}
directory = &old_header->OptionalHeader.DataDirectory[IMAGE_DIRECTORY_ENTRY_IMPORT];
if( directory->Size <= 0 )
importDir = &peHeader->OptionalHeader.DataDirectory[IMAGE_DIRECTORY_ENTRY_IMPORT];
if( importDir->Size <= 0 )
{
Q_snprintf( errorstring, sizeof( errorstring ), "%s has no dependencies. Is this dll valid?\n", name );
Q_snprintf( errorstring, sizeof( errorstring ), "%s has no dependencies. Is this library valid?\n", name );
goto libraryerror;
}
importDesc = (PIMAGE_IMPORT_DESCRIPTOR)CALCULATE_ADDRESS( data, directory->VirtualAddress );
importDesc = (PIMAGE_IMPORT_DESCRIPTOR)CALCULATE_ADDRESS( data, GetOffsetByRVA(importDir->VirtualAddress, peHeader) );
for( ; !IsBadReadPtr( importDesc, sizeof( IMAGE_IMPORT_DESCRIPTOR)) && importDesc->Name; importDesc++ )
{
const char *importName = ( const char* )CALCULATE_ADDRESS( data, importDesc->Name );
const char *importName = (const char *)CALCULATE_ADDRESS( data, GetOffsetByRVA( importDesc->Name, peHeader ) );
Con_Reportf( "library %s has direct dependency %s\n", name, importName );
if( !Q_stricmp( importName, depname ) )