GitHub user eiri opened a pull request:
https://github.com/apache/couchdb-couch/pull/173
Prevent reading beyond end of file and add config parameter to limit maxium
pread size
When a database file goes corrupt it is possible that pread will receive
bogus length and place a large part of the file in memory before couch_file
process will crash. Depending on a size of the file this could bring the whole
node down.
This change prevents pread from reading beyond end of a file and adding
configuration parameter `max_pread_size` to give a method to address a
situation when corrupted read does not go beyond eof, but still makes starting
node crash on a large read.
Two stats counters been added to report both exceptions.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/cloudant/couchdb-couch
65287-add-max-pread-size-limit
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/couchdb-couch/pull/173.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #173
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commit 89990e1800934823b83341152d2a103cd4bcad8b
Author: Eric Avdey <[email protected]>
Date: 2016-05-16T13:15:38Z
Raise exception on attempt of reading beyound end of file
commit 8ea500ef413d09f862609d34bdd8ac6737cd26a3
Author: Eric Avdey <[email protected]>
Date: 2016-05-16T16:55:52Z
Implement config parameter max_pread_size
commit 824af52d2aa543204aeb0bd5a1b90264f02e55a9
Author: Eric Avdey <[email protected]>
Date: 2016-05-16T19:47:36Z
Add stats counters for exceed_eof and exceed_limit
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