If I had a local working copy of a git (or any of the dvcs's) repository and a hacker attempted to taint the "master" copy, would that show up as a diff between my copy and the master?

With SVN, a hacker could inject changes into the repo on the server which would show up as a incoming change to my local repository.

In both cases, we could detect an intrusion if someone was vigilant enough to take a look at all incoming/outgoing changes and diffs -- or am I missing something?