Differential D1498

Linuxulator. Fix 'unsupported futex op' messages storm.
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Authored by dchagin on Jan 11 2015, 2:40 PM.

Details

Reviewers

trasz

Group Reviewers

Linux Emulation

Commits

rS283460: Print out unsupported futex operation message only once for the process.

Summary

Print out unsupported futex operation message only once for the process.

Test Plan

http://www.exploit-db.com/exploits/35370/

Linuxulator is not compromised by this exploit, but I got a kernel live lock due to the generation of a large amounts of such messages. It seems to me that syslogd races somewhere.

Diff Detail

Repository

rS FreeBSD src repository - subversion

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Unit

Tests Not Applicable

Event Timeline

dchagin updated this revision to Diff 3114.Jan 11 2015, 2:40 PM

dchagin retitled this revision from to Linuxulator. Fix 'unsupported futex op' messages storm..

dchagin updated this object.

dchagin edited the test plan for this revision. (Show Details)Jan 11 2015, 2:45 PM

dchagin added a reviewer: Linux Emulation.

dchagin added a subscriber: dumbbell.

emaste added a subscriber: emaste.Mar 25 2015, 7:39 PM

Perhaps we should just default to not log anything for unsupported operations - basically turn down the debug in linux_msg() - but this change shouldn't hurt.

This revision is now accepted and ready to land.Mar 27 2015, 10:07 AM

Closed by commit rS283460: Print out unsupported futex operation message only once for the process. (authored by dchagin). · Explain WhyMay 24 2015, 5:26 PM

This revision was automatically updated to reflect the committed changes.