[Deathcrow]

>A very tight SELinux policy could catch sshd executing something that ain’t a shell but hardening to that degree would be extremely rare I assume.

Huh, ssh executes things that aren't shells all the time during normal operation. No? i.e. 'ssh myserver.lan cat /etc/fstab'

[sega_sai]

I believe cat will be executed in the shell.