pmeunier/elpe - Change VZTI2E23QPSI2BQJVYHRYZ7SYNGMVCD345JJXUBPSVBHWQA3IQNAC

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

In some cases, we need to make room for new program headers, which means moving some sections towards the end of the file. However, if one of those sections is one we are adding in the same call, we need special handling.

Created by pmeunier on May 8, 2025

VZTI2E23QPSI2BQJVYHRYZ7SYNGMVCD345JJXUBPSVBHWQA3IQNAC

Dependencies

In channels

main

Change contents

Insertion in elfedit/src/lib.rs at line 1225 [4.69]

[2.3518]

[3.13332]

                            // 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;

Insertion in elfedit/src/lib.rs at line 1261 [4.69]
[3.14215]
[3.14215]
```
            let old_offset = sec.offset(id) as usize;
```

Insertion in elfedit/src/lib.rs at line 1265 [4.69]

[3.14351]


            // 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);
                }
            }