make MapFileOffsetToVA return ulong.MaxValue instead of throwing to improve perf and debugging experience, other elf improvements

Il2CppInspector.Common/FileFormatStreams/ElfReader.cs

@@ -400,6 +400,8 @@ namespace Il2CppInspector
                     pTables.Add((SHT_DYNSYM.sh_offset, conv.Div(SHT_DYNSYM.sh_size, SHT_DYNSYM.sh_entsize), SHT_STRTAB.sh_offset));
             }
 
+            var maxStrtabAddr = conv.Add(SHT_STRTAB.sh_offset, SHT_STRTAB.sh_size);
+
             // Symbol table in dynamic section (DT_SYMTAB)
             // Normally the same as .dynsym except that .dynsym may be removed in stripped binaries
 
@@ -407,8 +409,10 @@ namespace Il2CppInspector
             if (GetDynamicEntry(Elf.DT_STRTAB) is elf_dynamic<TWord> DT_STRTAB) {
                 if (GetDynamicEntry(Elf.DT_SYMTAB) is elf_dynamic<TWord> DT_SYMTAB) {
                     // Find the next pointer in the dynamic table to calculate the length of the symbol table
-                    var end = (from x in DynamicTable where conv.Gt(x.d_un, DT_SYMTAB.d_un) orderby x.d_un select x).First().d_un;
+                    var orderedTable = (from x in DynamicTable where conv.Gt(x.d_un, DT_SYMTAB.d_un) orderby x.d_un select x).ToList();
-
+                    if (orderedTable.Count != 0)
+                    {
+                        var end = orderedTable.First().d_un;
                         // Dynamic symbol table
                         pTables.Add((
                             conv.FromUInt(MapVATR(conv.ULong(DT_SYMTAB.d_un))),
@@ -417,6 +421,7 @@ namespace Il2CppInspector
                         ));
                     }
                 }
+            }
 
             // Now iterate through all of the symbol and string tables we found to build a full list
             symbolTable.Clear();
@@ -425,7 +430,11 @@ namespace Il2CppInspector
             foreach (var pTab in pTables) {
                 var symbol_table = ReadArray<TSym>(conv.Long(pTab.offset), conv.Int(pTab.count));
 
-                foreach (var symbol in symbol_table) {
+                foreach (var symbol in symbol_table)
+                {
+                    if (conv.Gt(conv.FromUInt(symbol.st_name), maxStrtabAddr)) 
+                        break; // Skip invalid symbol table indices, since we might read past it on obfuscated binaries
+
                     string name = string.Empty;
                     try {
                         name = ReadNullTerminatedString(conv.Long(pTab.strings) + symbol.st_name);
@@ -520,7 +529,7 @@ namespace Il2CppInspector
         public override ulong MapFileOffsetToVA(uint offset) {
             // Exclude relocation areas
             if (reverseMapExclusions.Any(r => offset >= r.Start && offset <= r.End))
-                throw new InvalidOperationException("Attempt to map to a relocation address");
+                return ulong.MaxValue;
 
             var section = PHT.First(x => offset >= conv.Int(x.p_offset) && offset < conv.Int(x.p_offset) + conv.Int(x.p_filesz));
             return conv.ULong(section.p_vaddr) + offset - conv.ULong(section.p_offset);

Il2CppInspector.Common/FileFormatStreams/FileFormatStream.cs

@@ -272,6 +272,12 @@ namespace Il2CppInspector
         public bool TryMapFileOffsetToVA(uint offset, out ulong va) {
             try {
                 va = MapFileOffsetToVA(offset);
+                if (va == ulong.MaxValue)
+                {
+                    va = 0;
+                    return false;
+                }
+
                 return true;
             }
             catch (InvalidOperationException) {