Re: Global variable in static library - double free or corruption error

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On 10/22/2010 02:18 PM, Jeffrey Walton wrote:
> On Fri, Oct 22, 2010 at 9:02 AM, Andrew Haley <aph@xxxxxxxxxx> wrote:
>> On 10/22/2010 01:22 PM, Jeffrey Walton wrote:
>>> On Fri, Oct 22, 2010 at 4:32 AM, Andrew Haley <aph@xxxxxxxxxx> wrote:
>>>> Please stop top-posting.  It makes it very hard to reply to you.
>>>>
>>>> On 10/21/2010 09:01 PM, Alexey Skidanov wrote:
>>>>> [SNIP]
>>>>> Regarding the ODR. You are absolutly right. But what about a MULTIPLE variable
>>>>> initialization. Is it correct behaviour according to standard?
>>>>
>>>> I don't know what you mean by a "MULTIPLE variable initialization".
>>> I believe he means the constructor running multiple times (the
>>> antithesis of the destructor running multiple times).
>>
>> Well, unless there's a bug you can't get that unless you break the
>> ODR.
>
> Am I the only guy under the impression that a Microsoft platform can
> suffer from Insecure Library Loading, while the Linux platform can
> suffer from Insecure Library Unloading due to ABI, ODR, and
> RTLD_GLOBAL?

I have no idea.

> RTFM and and ODR are great - until the attacker causes SELinux (or
> other important sub system) to crash due to this 'documented feature'.
> Shared data segments are evil and should not be the default :/

Probably, but it's too late for that.  And it's nothing to do with gcc.

Andrew.


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