On 03/24/2016 03:09 PM, Carsten Haitzler (The Rasterman) wrote:
> On Wed, 23 Mar 2016 19:15:38 -0400 Eric McCorkle <e...@metricspace.net> said:
>
>> Ok, I cracked it.
>>
>> modules/cpufreq/e_mod_main.c
>>
>> In _cpufreq_face_update_available
>>
>> If count is 0, then you get an integer underflow and end up passing a huge
>> number to malloc. The code probably ought to check for 0 and do nothing in
>> that case.
>>
>> It looks like there is a little suid program that reads the frequency, and my
>> system is set up with nosuid on the lib directory. That's one theory as to
>> why this problem emerges with ZFS. I'll try turning off nosuid and see what
>> happens.
>
> 1b73bedd4d796b530c0afca29532290b7ebed373
>
> will make it "handle" the lack of frequencies - but you still have a bug
> thanks
> to no setuid bit. we cant help you there. :) need it to mess with cpu power
> management for the user.
>
One mans bug is another mans security feature, you only need to fix it
if you want to manually play with your CPU's frequencies, If your happy
for the kernel to do that for you automagically the widget will still
give you nice frequency readings without enabling the suid bit.
>> On March 23, 2016 5:23:46 PM EDT, Quelrond <quelr...@gmail.com> wrote:
>>> To build FreeBSD port with debug symbols:
>>>
>>> # make WITH_DEBUG=yes
>>>
>>>
>>> That's how I proceeded to get detailed backtrace for phab ticket.
>>>
>>> Peter
>>>
>>>
>>> On 03/23/2016 19:16, Eric McCorkle wrote:
>>>> I couldn't seem to track down where the allocation is happening
>>> there. I also couldn't get the freebsd port build to do debug builds.
>>>>
>>>> I'm going to try good old printf debugging tonight to get to the
>>> bottom of it.
>>>>
>>>> On March 23, 2016 11:50:14 AM EDT, Miguel C <miguelmcl...@gmail.com>
>>> wrote:
>>>>> On Wed, Mar 23, 2016 at 1:14 PM, Eric McCorkle
>>> <e...@metricspace.net>
>>>>> wrote:
>>>>>
>>>>>> A possible root cause: ZFS allows for noexec and nosuid options on
>>>>> file
>>>>>> systems. I believe the freebsd installer sets them by default, so
>>> if
>>>>>> you're storing executables in places other than bin/ directories,
>>>>> that
>>>>>> could be part of the problem.
>>>>>>
>>>>>>
>>>>> True, but that's not the "default" case, exec is set to "on" on all
>>> the
>>>>> datasets and noexec/nosuid are not present. And if that was the case
>>> I
>>>>> guess we would see some related error, but what do I know :P
>>>>>
>>>>> However:
>>>>> "Above that is what basically comes down to a trace of freebsd
>>> malloc
>>>>> for
>>>>> an impossibly huge block (size 34359738376). Looks like something
>>> in
>>>>> e_modapi_save is allocating bad-sized blocks."
>>>>>
>>>>> maybe e_modapi_save just doesn't do this well for zfs, but just
>>>>> guessing,
>>>>> I'm not a C coder :|
>>>>>
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