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Handle ELF notes with arrays.

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Natalia Portillo
2018-03-15 10:30:13 +00:00
parent 8644a36e40
commit 7c9d288fcb
1 changed files with 62 additions and 47 deletions
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109
libexeinfo/ELF/ELF.cs
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@@ -155,32 +155,39 @@ namespace libexeinfo
interpreter = StringHandlers.CToString(buffer); interpreter = StringHandlers.CToString(buffer);
break; break;
case phType.PT_NOTE when buffer.Length > 12: case phType.PT_NOTE when buffer.Length > 12:
uint namesz = BitConverter.ToUInt32(buffer, 0); pos = 0;
uint descsz = BitConverter.ToUInt32(buffer, 4); while(pos < buffer.Length)
uint notetype = BitConverter.ToUInt32(buffer, 8);
pos = 12;
if(IsBigEndian)
{ {
namesz = Swapping.Swap(namesz); uint namesz = BitConverter.ToUInt32(buffer, pos + 0);
descsz = Swapping.Swap(descsz); uint descsz = BitConverter.ToUInt32(buffer, pos + 4);
notetype = Swapping.Swap(notetype); uint notetype = BitConverter.ToUInt32(buffer, pos + 8);
pos += 12;
if(IsBigEndian)
{
namesz = Swapping.Swap(namesz);
descsz = Swapping.Swap(descsz);
notetype = Swapping.Swap(notetype);
}
ElfNote note = new ElfNote
{
name = Encoding.ASCII.GetString(buffer, pos, (int)(namesz - 1)),
type = notetype,
contents = new byte[descsz]
};
pos += (int)namesz;
pos += pos % 4 != 0 ? 4 - pos % 4 : 0;
Array.Copy(buffer, pos, note.contents, 0, descsz);
pos += (int)descsz;
pos += pos % 4 != 0 ? 4 - pos % 4 : 0;
RequiredOperatingSystem = GetOsByNote(note, interpreter, IsBigEndian);
} }
ElfNote note = new ElfNote
{
name = Encoding.ASCII.GetString(buffer, pos, (int)(namesz - 1)),
type = notetype,
contents = new byte[descsz]
};
pos += (int)namesz;
pos += pos % 4 != 0 ? 4 - pos % 4 : 0;
Array.Copy(buffer, pos, note.contents, 0, descsz);
RequiredOperatingSystem = GetOsByNote(note, interpreter, IsBigEndian);
break; break;
} }
} }
@@ -418,32 +425,40 @@ namespace libexeinfo
} }
else if(sectionNames[i].StartsWith(".note") && buffer.Length > 12) else if(sectionNames[i].StartsWith(".note") && buffer.Length > 12)
{ {
uint namesz = BitConverter.ToUInt32(buffer, 0); pos = 0;
uint descsz = BitConverter.ToUInt32(buffer, 4); while(pos < buffer.Length)
uint notetype = BitConverter.ToUInt32(buffer, 8);
pos = 12;
if(IsBigEndian)
{ {
namesz = Swapping.Swap(namesz); uint namesz = BitConverter.ToUInt32(buffer, pos);
descsz = Swapping.Swap(descsz); uint descsz = BitConverter.ToUInt32(buffer, pos + 4);
notetype = Swapping.Swap(notetype); uint notetype = BitConverter.ToUInt32(buffer, pos + 8);
pos += 12;
if(IsBigEndian)
{
namesz = Swapping.Swap(namesz);
descsz = Swapping.Swap(descsz);
notetype = Swapping.Swap(notetype);
}
ElfNote note = new ElfNote
{
name = Encoding.ASCII.GetString(buffer, pos, (int)(namesz - 1)),
type = notetype,
contents = new byte[descsz]
};
pos += (int)namesz;
pos += pos % 4 != 0 ? 4 - pos % 4 : 0;
Array.Copy(buffer, pos, note.contents, 0, descsz);
pos += (int)descsz;
pos += pos % 4 != 0 ? 4 - pos % 4 : 0;
string notename = note.type != 1 ? $"{sectionNames[i]}.{note.type}" : sectionNames[i];
if(!notes.ContainsKey(notename))
notes.Add(notename, note);
} }
ElfNote note = new ElfNote
{
name = Encoding.ASCII.GetString(buffer, pos, (int)(namesz - 1)),
type = notetype,
contents = new byte[descsz]
};
pos += (int)namesz;
pos += pos % 4 != 0 ? 4 - pos % 4 : 0;
Array.Copy(buffer, pos, note.contents, 0, descsz);
notes.Add(sectionNames[i], note);
} }
} }