add number arg for 'heap chunk' command

[skysider]

add number arg for 'heap chunk command'

Description/Motivation/Screenshots

add a number argument for heap chunk command which is usable for statically linked binary. There is no need to know the main_arena address and mp_ address for heap chunks, just chunk address and number.

gef➤  heap chunk -h
usage: heap chunk [-h] [--allow-unaligned] [--number NUMBER] [address]

positional arguments:
  address

optional arguments:
  -h, --help         show this help message and exit
  --allow-unaligned
  --number NUMBER

gef➤  heap chunk 0x4e5400
Chunk(addr=0x4e5400, size=0xd0, flags=PREV_INUSE)
Chunk size: 208 (0xd0)
Usable size: 200 (0xc8)
Previous chunk size: 0 (0x0)
PREV_INUSE flag: On
IS_MMAPPED flag: Off
NON_MAIN_ARENA flag: Off

gef➤  heap chunk --number 6 0x4e5400
Chunk(addr=0x4e5400, size=0xd0, flags=PREV_INUSE)
Chunk(addr=0x4e54d0, size=0x1a0, flags=PREV_INUSE)
Chunk(addr=0x4e5670, size=0x200, flags=PREV_INUSE)
Chunk(addr=0x4e5870, size=0xbc0, flags=PREV_INUSE)
Chunk(addr=0x4e6430, size=0x330, flags=PREV_INUSE)
Chunk(addr=0x4e6760, size=0x4c0, flags=PREV_INUSE)
gef➤  heap chunk --number 10 0x4e5400
Chunk(addr=0x4e5400, size=0xd0, flags=PREV_INUSE)
Chunk(addr=0x4e54d0, size=0x1a0, flags=PREV_INUSE)
Chunk(addr=0x4e5670, size=0x200, flags=PREV_INUSE)
Chunk(addr=0x4e5870, size=0xbc0, flags=PREV_INUSE)
Chunk(addr=0x4e6430, size=0x330, flags=PREV_INUSE)
Chunk(addr=0x4e6760, size=0x4c0, flags=PREV_INUSE)
Chunk(addr=0x4e6c20, size=0x650, flags=PREV_FREE)
Chunk(addr=0x4e7270, size=0xd50, flags=PREV_INUSE)
Chunk(addr=0x4e7fc0, size=0x1e050, flags=PREV_INUSE)
[!] Command 'heap chunk' failed to execute properly, reason: Cannot access memory at address 0x506008

How Has This Been Tested?

Architecture	Yes/No	Comments
x86-32	✖️
x86-64	✔️
ARM	✖️
AARCH64	✖️
MIPS	✖️
POWERPC	✖️
SPARC	✖️
RISC-V	✖️
make test	✖️

Checklist

• My PR was done against the dev branch, not master.
• My code follows the code style of this project.
• My change includes a change to the documentation, if required.
• My change adds tests as appropriate.
• I have read and agree to the CONTRIBUTING document.

[daniellimws]

Thanks for the PR! Could you also update the documentation, and the help message? It wasn't immediately clear to me at the start what this argument does.

[hugsy]

Thanks for the PR.

The code though needs to be updated. Also you're missing adding unit test cases, please provide some.

[hugsy]

LGTM

[daniellimws]

👍 LGTM