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Handle ELF files with incorrect section header pointer.

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Natalia Portillo
2018-03-15 10:14:25 +00:00
parent 93ce2ab0ab
commit 8644a36e40
1 changed files with 52 additions and 0 deletions
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52
libexeinfo/ELF/ELF.cs
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@@ -241,6 +241,58 @@ namespace libexeinfo
buffer = new byte[Header.e_shentsize]; buffer = new byte[Header.e_shentsize];
sections = new Elf64_Shdr[Header.e_shnum]; sections = new Elf64_Shdr[Header.e_shnum];
// Read section 0, aka "the NULL section"
BaseStream.Read(buffer, 0, buffer.Length);
switch(Header.ei_class)
{
case eiClass.ELFCLASS32:
sections[0] = UpBitsSection(buffer, Header.ei_data == eiData.ELFDATA2MSB);
break;
case eiClass.ELFCLASS64:
if(Header.ei_data == eiData.ELFDATA2MSB)
{
sections[0] = BigEndianMarshal.ByteArrayToStructureBigEndian<Elf64_Shdr>(buffer);
sections[0].sh_flags = (shFlags64)Swapping.Swap((ulong)sections[0].sh_flags);
sections[0].sh_type = (shType)Swapping.Swap((uint)sections[0].sh_type);
}
else sections[0] = BigEndianMarshal.ByteArrayToStructureLittleEndian<Elf64_Shdr>(buffer);
break;
default: return;
}
// Not a null section, in some ELFs, header contains incorrect pointer, but section header "should" be at end of file so check there
if(sections[0].sh_type != shType.SHT_NULL)
{
BaseStream.Position = BaseStream.Length - Header.e_shentsize * Header.e_shnum;
BaseStream.Read(buffer, 0, buffer.Length);
switch(Header.ei_class)
{
case eiClass.ELFCLASS32:
sections[0] = UpBitsSection(buffer, Header.ei_data == eiData.ELFDATA2MSB);
break;
case eiClass.ELFCLASS64:
if(Header.ei_data == eiData.ELFDATA2MSB)
{
sections[0] = BigEndianMarshal.ByteArrayToStructureBigEndian<Elf64_Shdr>(buffer);
sections[0].sh_flags = (shFlags64)Swapping.Swap((ulong)sections[0].sh_flags);
sections[0].sh_type = (shType)Swapping.Swap((uint)sections[0].sh_type);
}
else sections[0] = BigEndianMarshal.ByteArrayToStructureLittleEndian<Elf64_Shdr>(buffer);
break;
default: return;
}
// Still not null section, stop gracefully
if(sections[0].sh_type != shType.SHT_NULL) return;
// Rewind
BaseStream.Position = BaseStream.Length - Header.e_shentsize * Header.e_shnum;
}
// Rewind
else BaseStream.Position = (long)Header.e_shoff;
for(int i = 0; i < sections.Length; i++) for(int i = 0; i < sections.Length; i++)
{ {
BaseStream.Read(buffer, 0, buffer.Length); BaseStream.Read(buffer, 0, buffer.Length);