ELF chunks are miscalculated on OpenWRT

[vlaci]

Elf files from this firmware gets sliced up to very small elf and the remainding unknown chunks.

e.g:

$ ls usr/sbin/dropbear_extract
0-276.elf32  0-276.elf32_extract  276-176611.unknown

[martonilles]

Some ELF binaries have no sections only program segments, which are not handled properly. PR is on it's way ;)

[e3krisztian]

Another example of length miscalculation:
https://download.pocketbook-int.com/fw/Yitoa/840/user/20190521/sw_20190521_U840_5.20.706_user.zip

here almost all elf files are split. The unknown part is usually 1-3 bytes long:

│               │   │   │   ├── libQt5DBus.so.5.11.2_extract
│               │   │   │   │   ├── 0-638374.elf32
│               │   │   │   │   ├── 0-638374.elf32_extract
│               │   │   │   │   └── 638374-638376.unknown
│               │   │   │   ├── libQt5Gui.so.5.11.2
│               │   │   │   ├── libQt5Gui.so.5.11.2_extract
│               │   │   │   │   ├── 0-5014879.elf32
│               │   │   │   │   ├── 0-5014879.elf32_extract
│               │   │   │   │   └── 5014879-5014880.unknown
│               │   │   │   ├── libQt5Network.so.5.11.2
│               │   │   │   ├── libQt5Network.so.5.11.2_extract
│               │   │   │   │   ├── 0-1802823.elf32
│               │   │   │   │   ├── 0-1802823.elf32_extract
│               │   │   │   │   └── 1802823-1802824.unknown