[mhogomchungu]

Its because you overrode the default option of "suid" with your "nosuid" when mounting.TrueCrypt does not do this and that is where the problem is.

To reproduce the problem,use TrueCrypt with its default mount options,or do your mounting with mount's default options.

The fundamental problem is a bad usage of mount command that comes from usage of mount's default options.You cant reproduce the problem because you changed a bad default option to a good one.

[simoncion]

> The fundamental problem is ... mount's default options.

This is exactly my point. You might as well complain to Ted Ts'o about the same vulnerability in ext4. Please do reply to my comment here: https://news.ycombinator.com/item?id=8060884