On Oct 11, 2021, at 12:41 PM, Érico Nogueira <ericonr@disroot.org> wrote:

Things in /etc
can, theoretically, only be written to by root or at least trusted
users, so treating as entirely untrusted seems a bit over the top...

My understanding is that tcb exists explicitly to make these files modifiable by non-root users, to make the shadow tools unprivileged.

I don't recall if GECOS or group fields are included in tcb, or if it is only the password itself. If the other fields are included, this is a much more important bug than otherwise.

Best,

-arw

A. Wilcox (Sent from my iPhone)

Mac, iOS, Linux software engineer