Elfedit: handling the case where we move the same section we're adding

pmeunier

May 8, 2025, 5:16 PM

VZTI2E23QPSI2BQJVYHRYZ7SYNGMVCD345JJXUBPSVBHWQA3IQNAC

Dependencies

• [2] ZV57M4VN Debugging
• [*] AR2X3TLA Initial commit: introducing elfedit
• [*] 5PJAXSZ7 Elfedit: correct reallocation of dynstr/dynamic

Change contents

• edit in elfedit/src/lib.rs at line 1225
  [2.3518]

  [5.13332]
  + // Since we may be trying to update this

  + // very section + segment (example: if the

  + // interpreter is the first section),

  + // update the `programs` array.

  + programs[pi].0 = new_offset;
• edit in elfedit/src/lib.rs at line 1261
  [5.14215]

  [5.14215]
  + let old_offset = sec.offset(id) as usize;
• edit in elfedit/src/lib.rs at line 1265
  [5.14351]

  [5.14351]
  +

  + // Update the corresponding segment, which may have been

  + // moved just above (hence the resetting of programs[..]

  + // above).

  + for (o, _, ty, _, p) in &programs {

  + if *o == old_offset && *ty != Pht::LOAD {

  + let mut p = self.program_mut(*p as usize);

  + p.set_offset(id, new_offset);

  + p.set_filesz(id, new.len());

  + p.set_memsz(id, new.len());

  + p.set_vaddr(id, last_vaddr as usize);

  + }

  + }

  +