[php-maint] Bug#459020: Bug#459020: 043-recode_size_t.patch is invalid for recent php versions

Vincent Tondellier tonton-lists at team1664.org
Fri Feb 8 02:06:19 UTC 2008

Steve Langasek wrote:
> On Wed, Feb 06, 2008 at 08:41:22PM +0100, Vincent Tondellier wrote:
>> The patch 043-recode_size_t.patch is broken.
>> req_len and str_len should be integers, but are size_t
>> (zend_parse_parameters wants pointers to int). This is a problem for 64
>> bits arches since a part of the variables is not initialized
>> (sizof(size_t) != sizeof(int)), and recode_buffer_to_buffer is called
>> with funny values that makes librecode eat all the system's memory.
> So then, PHP isn't capable of passing values whose length exceeds UINT_MAX?
> That's an annoyingly arbitrary limitation.

PHP isn't designed to do large memory allocations ...

> But yes, your analysis here looks correct to me.
>> An updated version of the patch witch fixes the problem for me is
>> attached to this mail and should be, IMO, applied as a security fix for
>> etch.
> I don't see any evidence that this is a security issue, but it should be
> applied as a stable release update.

I think this is a security issue since it can cause a Denial Of Service
by eating all the server memory. I had the problem on one of my servers
(2GB RAM / 3GB swap) and it took at least 10min for oom_killer to kill
the process, and in another case the kernel crashed (I didn't change the
memory limit settings in /etc/security/limits.conf).

And you can trigger the bug remotely by sending a mail like Sebastian
Göbel said above.

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