> Oh, my ... it's worse than I thought. Not only does it run things so you have 
> to wait forever - it actually installs packages behind your back!  Wow, now 
> there is the nightmare abuse of \Sexpr - the malicious package retrieves 
> private data from your machine and deletes your files... and I was worrying 
> about leaving a tiny crack open for Rhttpd injection attacks - yet there is a 
> big gaping door open to all packages ... Does it mean we need more stringent 
> checks on Rd files now as well since they contain code?

As long as you realise Rd files can run arbitrary R code, you're no
worse off than you were before Rd files could run code.  No one is
checking that there's not a function in ggplot2 that secretly sends me
all your code and data ;)

Hadley

-- 
Assistant Professor / Dobelman Family Junior Chair
Department of Statistics / Rice University
http://had.co.nz/

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