How to undo codesign?

Question

In an attempt to codesign gdb, I used an incorrect certificate, so now gdb is codesigned but does not work as expected.

I attempted to codesign gdb using the correct certificate, however codesign complains that gdb is already signed.

So how to undo it?

The codesign command I used was:

codesign -s gdb-cert gdb

Answer 1

It's not well documented at all, from what I can tell, but you may be able to remove code signing via:

codesign --remove-signature gdb

Answer 2

I had a problem with removing signature as suggested by Micheal:

unsupported type or version of signature

Finally I used -f flag and force loaded new certificate.

Answer 3

Add --force to the arguments of your codesign command to make it re-sign something.

For example:

codesign --force --sign gdb-cert gdb