Re: Bug plperl.c

Hi Tom,

No rush on the bug fix, just making sure you don't need anything else
from me on the reproduction.

Yeah I realized my patch wasn't a full solution after sending it in...
My test environment was a little wiggity, and I compiled and tested...
but noticed I actually wasn't using the new build... (and thought that
it was fixed with my change)

Based on the side-effects I think it does make sense to block queries
entirely during parse

On 2/25/22 16:36, Tom Lane wrote:
> Mark Murawski <markm-lists(at)intellasoft(dot)net> writes:
>> Were you able to reproduce using the updated example?
> Sorry, this wasn't at the top of my to-do queue. It does reproduce
> for me, and I think what we need to do about it is the attached.
> In the normal code paths, this change will disallow usage of SPI until
> we have completed compile_plperl_function and have a valid "prodesc"
> to look at. I didn't care for your proposed workaround because
>
> (1) it'd allow execution of non-read-only code during compilation
> of a supposedly read-only function;
>
> (2) it didn't patch the dozen or so other places where plperl SPI
> functions could try to dereference prodesc;
>
> (3) allowing code execution during function validation is, if not
> an actual security hole, certainly on the hairy edge of being one.
>
> I'm somewhat comforted about (3) because it seems the problem is only
> reachable from plperlu not plperl. It's still pretty scary though.
>
> I realize that this solution might make your use-case rather awkward.
> As far as function validation goes, you can still create your functions
> by setting check_function_bodies = off. If you feel you need to have
> Perl code that executes during compilation otherwise, I'm not sure
> what to tell you, except that it doesn't seem like a great idea.
>
> I also noticed while looking at this that the relatively-recently-added
> plperl_spi_commit and plperl_spi_rollback functions neglected to do
> check_spi_usage_allowed(), so this fixes that too.
>
> regards, tom lane
>