One source package builds the dynamic linker itself, as well as the fixed libc. The other fixes a bug in PAM; the pam_unix module returns success instead of the proper error under some circumstances. See Debian bug 323982 for the details. If necessary, the package could be itself patched, but as I’m focused on Debian stable’s LSB compatibility, I’m assuming that there will be resistance to the idea of patching stable in this way.
With these packages installed on top, nearly all of Debian’s LSB problems are resolved. Some exceptions may be found in this post.