After strip debug symbols, arm64 binaries stopped working on M1 mac

[vanc]

For a simple helloworld program, use arm64-apple-darwin20.4-cc to generate a executable, named hello.

Copy the file to hello.stripped, then strip all debug symbols with:

cp hello hello.stripped
arm64-apple-darwin20.4-strip -S -x -u hello.stripped

Transfer both files to M1 mac, and run them.

$ ./hello
Hello World
$ ./hello.stripped
Killed: 9

If strip symbols on the M1 mac itself, everything works fine. I can also resign the stripped binary on mac (even Intel mac), the binary will also work well.

$ codesign -s - hello.stripped

The strip command from osxcross complained about invalidating codesign signatures. That should be the reason. But on macOS (including Intel and M1 models), the strip tool will regenerate the ad-hoc signature.

I tried zsign, but it didn't solve the issue.

Any way in osxcross to regenerate the ad-hoc codesign signatures?

[vanc]

This issue might share the same root cause as #279.

[tpoechtrager]

You could try to sign the binary again with https://github.com/thefloweringash/sigtool

[HinTak]

I wrote some python code which can analyze and remove the signatures (and allow binaries to be resigned) at https://github.com/HinTak/mono-modification , they run on linux to analyze them. You might be able to adapt them to add an ad-hoc signature.

The context is that signatures are appended to binaries. But mono also has a way of making self-contained executable, such that the mono runtime looks at itself, and find extra things at the end of itself. So I wrote some scripts to make the two systems co-exist.

If you can attach the stripped and broken binary and the re-signed and fixed binary here for me to have a look?

[vanc]

You could try to sign the binary again with https://github.com/thefloweringash/sigtool

Thank you @tpoechtrager. That's exactly what I needed. Tried on a few binaries, and all of them could run properly on M1 mac after re-signed with sigtool.

Very appreciated for the pointer!

[vanc]

Hope sigtool or an equivalent could be merged to osxcross. Thanks again.

[tpoechtrager]

I will once I find the time for it.