Kernel: Fix for CVE-2017-1000364 (mm: enlarge stack guard gap) breaks java application

From	Stephan Seitz <stse+debian@fsing.rootsland.net>
Newsgroups	linux.debian.security
Subject	Kernel: Fix for CVE-2017-1000364 (mm: enlarge stack guard gap) breaks java application
Date	2017-06-26 14:50 +0200
Message-ID	<tWBCO-2pu-43@gated-at.bofh.it> (permalink)
Organization	Minas Tirith, Gondor

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Hi!

The kernel fix for CVE-2017-1000364 (mm: enlarge stack guard gap) breaks 
java application (or at least some), see 
https://stackoverflow.com/questions/44719488/segmentation-fault-when-starting-jvm-using-jpype

You can change the stack guard gap via kernel parameter:

stack_guard_gap=	[MM]
override the default stack gap protection. The value is in page units and 
it defines how many pages prior to (for stacks growing down) resp. after 
(for stacks growing up) the main stack are reserved for no other mapping. 
Default value is 256 pages.

What is the value to get the previous behaviour?

Many greetings,

	Stephan

-- 
| Public Keys: http://fsing.rootsland.net/~stse/keys.html |

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Kernel: Fix for CVE-2017-1000364 (mm: enlarge stack guard gap)  breaks java application Stephan Seitz <stse+debian@fsing.rootsland.net> - 2017-06-26 14:50 +0200
  Re: Kernel: Fix for CVE-2017-1000364 (mm: enlarge stack guard gap)  breaks java application Salvatore Bonaccorso <carnil@debian.org> - 2017-06-27 22:20 +0200
    Re: Kernel: Fix for CVE-2017-1000364 (mm: enlarge stack guard gap)  breaks java application Stephan Seitz <stse+debian@fsing.rootsland.net> - 2017-06-28 10:30 +0200
    Re: Kernel: Fix for CVE-2017-1000364 (mm: enlarge stack guard gap)  breaks java application Rene Engelhard <rene@debian.org> - 2017-07-02 12:30 +0200

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