[SharedCache] Debug symbols found by IDA are not being found by Binary Ninja

[WeiN76LQh]

Version and Platform (required):

• Binary Ninja Version: 5.0.7218-dev (c480ce0c)
• OS: macOS
• OS Version: 15.2
• CPU Architecture: M1

Bug Description:
I'm noticing debug symbols found by IDA are not being found by Binary Ninja. An example is provided in the steps below. Seems like there might be quite a number missing.

Steps To Reproduce:
Please provide all steps required to reproduce the behavior:

1. Open the DYLD Shared Cache from the IPSW for iPhone17,2 iOS 18.1.1 22B91
2. Load the image /usr/lib/libobjc.A.dylib.
3. Go to 0x20b3aba80 and observe the function has no symbol. In IDA the function is called __xpc_connection_call_event_handler, and also the surrounding functions have symbols as well in IDA.

Expected Behavior:
All symbols in the DSC should be found and applied.

Additional Information:
Not 100% sure but maybe the solution is to use the .symbols file. If I remember correctly the reworked DSC plugin doesn't.

[emesare]

Seems to be the .symbols file

I went ahead and made a preliminary branch that fixes this: b2d387f

Following your PR #6210 I made some improvements such as identifying the symbol table entry based off the image address, the comment here suggests this is fine, and I am inclined to initially limit this parsing to 64bit, with a TODO to add 32bit support later (if the image address is not a VM).

There is still some code cleanup on that branch but the diff is quite small so I will likely finish it up later tomorrow evening when i merge the fixes for your other issues, however its not a bug or regression so it might not be merged for the 5.0 release, we will see.

Thank you again for the contributions. I apologize I did not get to this earlier, I made some comments to in the code to add this but I guess I never got around to it.

[emesare]

Also let me know if you want to be co-authored on the commit once it lands, seeing as the rework itself incorporated some of your changes prior to this, it only seems fair. I can otherwise leave you out of the commit, either works for me. Thanks.

[WeiN76LQh]

Don't worry about co-authoring me. Appreciate the quick follow up on the DSC issues.

[emesare]

Added with ea47d4c, on dev with >7221. Thank you again!