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write valid dummy sections

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Folkert 2022-10-02 15:37:53 +02:00
parent cf23feb996
commit a798552dee
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1 changed files with 21 additions and 6 deletions
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27
crates/linker/src/pe.rs
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@ -603,11 +603,26 @@ impl Preprocessor {
}
fn write_dummy_sections(&self, result: &mut MmapMut, extra_sections: &[[u8; 8]]) {
const W: usize = std::mem::size_of::<ImageSectionHeader>();
let previous_section_header =
load_struct_inplace::<ImageSectionHeader>(result, self.extra_sections_start - W);
let previous_section_header_end = previous_section_header.virtual_address.get(LE)
+ previous_section_header.virtual_size.get(LE);
let mut next_virtual_address =
next_multiple_of(previous_section_header_end as usize, self.section_alignment);
for (i, name) in extra_sections.iter().enumerate() {
let header = ImageSectionHeader {
name: *name,
virtual_size: Default::default(),
virtual_address: Default::default(),
// NOTE: the virtual_size CANNOT BE ZERO! the binary is invalid if a section has
// zero virtual size. Setting it to 1 works, (because this one byte is not backed
// up by space on disk, the loader will zero the memory if you run the executable)
virtual_size: object::U32::new(LE, 1),
// NOTE: this must be a valid virtual address, using 0 is invalid!
virtual_address: object::U32::new(LE, next_virtual_address as u32),
size_of_raw_data: Default::default(),
pointer_to_raw_data: Default::default(),
pointer_to_relocations: Default::default(),
@ -617,11 +632,11 @@ impl Preprocessor {
characteristics: Default::default(),
};
let header_array: [u8; std::mem::size_of::<ImageSectionHeader>()] =
unsafe { std::mem::transmute(header) };
let header_array: [u8; W] = unsafe { std::mem::transmute(header) };
result[self.extra_sections_start + i * header_array.len()..][..header_array.len()]
.copy_from_slice(&header_array);
result[self.extra_sections_start + i * W..][..W].copy_from_slice(&header_array);
next_virtual_address += self.section_alignment;
}
}