RFR (S) 8023956 [2nd post]: Provide a work-around to broken Linux 32 bit "Exec Shield" using CS for NX emulation (crashing with SI_KERNEL)

[David Simms]

Hi Zhengyu,

So the work around code executes in early start up (os::init_2) before 
MemTracker is bootstrapped, but yeah (to cover any future additions), 
using top level os::reserve/commit methods, patch updated:

http://cr.openjdk.java.net/~dsimms/8023956/ 
<http://cr.openjdk.java.net/%7Edsimms/8023956/>

Cheers


On 09/23/2013 05:25 PM, Zhengyu Gu wrote:
> Hi David,
>
> /src/os_cpu/linux_x86/vm/os_linux_x86.cpp #906
>
> The mmap() call needs to be reported to native memory tracking.
>
> Thanks,
>
> -Zhengyu
>
> On 9/23/2013 8:27 AM, Coleen Phillmore wrote:
>>
>> David,
>> This looks really good.   Thank you for adding this workaround.   
>> Should you remove the SI_KERNEL message that we have in the signal 
>> handler too?
>> Thanks,
>> Coleen
>>
>> On 9/23/2013 5:02 AM, David Simms wrote:
>>>
>>>
>>>
>>> -------- Original Message --------
>>> Subject: 	RFR (S) 8023956: Provide a work-around to broken Linux 32 
>>> bit "Exec Shield" using CS for NX emulation (crashing with SI_KERNEL)
>>> Date: 	Mon, 02 Sep 2013 13:18:52 +0200
>>> From: 	David Simms <david.simms at oracle.com>
>>> To: 	hotspot-runtime-dev at openjdk.java.net
>>>
>>>
>>>
>>> G'day all,
>>>
>>> Please review a small enhancement for working around a rare but 
>>> annoying Linux bug (ia32 only).
>>>
>>> Bug link: https://bugs.openjdk.java.net/browse/JDK-8023956 ( 
>>> http://bugs.sun.com/view_bug.do?bug_id=8023956)
>>>
>>> Webrev: http://cr.openjdk.java.net/~dsimms/8023956/ 
>>> <http://cr.openjdk.java.net/%7Edsimms/8023956/>
>>>
>>> Cheers
>>> /David Simms
>>>
>>>
>>
>

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