unchangable values or codes in lib

[Marika]

Hello.

I noticed some values in lib which I am unable to change. Usually values or Arm codes in a lib is super easy to change but it just won't change and freeze also would not work.

I am guessing those codes only run at very early stage of loading the game( I placed breakpoints on them with GDB but nothing seems to hit them after everything is loaded).(and sorry if I am wrong I am not so knowledgeable) 

My questions are why they won't change and is there any other way to change them other than modding those codes with a hex editor?

Any opinions or tips?

Thank you!

[CmP]

12 hours ago, Platonic said:

You can't edit the values if you don't have write permission. 

GG can write to memory without writable permission when it can attach to process with ptrace.

Reference: 

On 3/14/2019 at 3:48 AM, Enyby said:

For write to read-only memory need attach.

Gathering information about GG errors (#bhgjnmg7)

 

[Platonic]

On 1/24/2023 at 7:26 PM, CmP said:

GG can write to memory without writable permission when it can attach to process with ptrace.

How do i confirm if it attache to process with ptrace? 

[CmP]

16 minutes ago, Platonic said:

How do i confirm if it attache to process with ptrace?

It does that by default, I think. When it can't, it's mostly (or only) due to protection of the game that prevents it. Presence of such protection can be typically noticed by second process that is attached to main process.

[Platonic]

11 hours ago, CmP said:

It does that by default, I think. When it can't, it's mostly (or only) due to protection of the game that prevents it. Presence of such protection can be typically noticed by second process that is attached to main process.

Oke, i only tested it on a app named instagram. And there was no "#" or "!" there. For that i wondered if it was relevant to the app being traced by a specific process or something else.

[Platonic]

You can't edit the values if you don't have write permission. 

More info: https://linux.die.net/man/5/proc

Dunno if you can change permission, i think i saw a post about it 2 years ago, i checked the person his profile but the post got hidden or deleted.

[XEKEX]

when you execute the app it make an image of the lib(and other files) and load them in memory 
note : the loaded files are just copies of the original files (modding will modify the originals GG will modify the copies) original files stay intact when you execute the app.
if the app have some kind of security that detect the changement of the copies (in case of read write privliage) 
view the arm code as bytes and calculate the diff when you change the values check the add to value do not replace checkbox and edit it byte by byte