Re: syntax error causes crafted data to be executed in shell

Bruce Momjian <pgman@candle.pha.pa.us> writes:
> Tom, would you show an example of the change in behavior? I didn't
> understand the details.

In CVS tip:

regression=# \N `touch wrong1` \i `touch wrong2`
Invalid command \N. Try \? for help.
: No such file or directory
regression=#

Both wrong1 and wrong2 are created.  Thomer originally asserted that
wrong1 shouldn't have been created, ie, we shouldn't have tried to
evaluate the backticked "argument" to \N.  I further suggest that it's
not a good idea to even try to process the \i command.  I'd prefer to
see something like

regression=# \N `touch wrong1` \i `touch wrong2`
Invalid command \N. Try \? for help.
Ignoring junk "`touch wrong1` \i `touch wrong2`"
regression=#

            regards, tom lane