Bug 108115 - Merging registry modules can overflow
Summary: Merging registry modules can overflow
Status: NEW
Alias: None
Product: LibreOffice
Classification: Unclassified
Component: LibreOffice (show other bugs)
Version:
(earliest affected)
Inherited From OOo
Hardware: All All
: medium normal
Assignee: Not Assigned
URL:
Whiteboard:
Keywords:
Depends on:
Blocks:
 
Reported: 2017-05-26 12:16 UTC by Chris Sherlock
Modified: 2022-10-14 03:32 UTC (History)
2 users (show)

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Description Chris Sherlock 2017-05-26 12:16:44 UTC
In the registry module, if you have two sets of registry "modules" (keys and subkeys) then you can potentially cause an overflow condition in ORegistry::mergeModuleValue().

That's because a RegistryTypeWriter has a capacity of (2^16 - 1), but when this function merges there can potentially be more than (2^16 - 1) values it tries to insert.

We need to either insert check that the total number of values to be inserted aren't going to be more than (2^16 -1) and give RegError::NO_ERROR, or we need to insert the original values, then insert the rest of the values and return a new error value RegError::PARTIAL_MERGE

I favour the latter, as we are sort of doing this already in the code, only we don't warn it is a partial merge.
Comment 1 Xisco Faulí 2017-05-26 15:00:20 UTC
I trust you, moving to NEW ;-)
Comment 2 Chris Sherlock 2017-06-08 02:35:55 UTC
I have submitted a change to gerrit for review - https://gerrit.libreoffice.org/#/c/38071/

I've added Stefan Bergmann and Michael Meeks to the code review.
Comment 3 Xisco Faulí 2017-10-12 08:09:49 UTC
Dear Chris Sherlock,
This bug has been in ASSIGNED status for more than 3 months without any
activity. Resetting it to NEW.
Please assigned it back to yourself if you're still working on this.
Comment 4 QA Administrators 2018-10-13 03:14:09 UTC Comment hidden (obsolete)
Comment 5 QA Administrators 2020-10-13 04:47:10 UTC Comment hidden (obsolete)
Comment 6 QA Administrators 2022-10-14 03:32:58 UTC
Dear Chris Sherlock,

To make sure we're focusing on the bugs that affect our users today, LibreOffice QA is asking bug reporters and confirmers to retest open, confirmed bugs which have not been touched for over a year.

There have been thousands of bug fixes and commits since anyone checked on this bug report. During that time, it's possible that the bug has been fixed, or the details of the problem have changed. We'd really appreciate your help in getting confirmation that the bug is still present.

If you have time, please do the following:

Test to see if the bug is still present with the latest version of LibreOffice from https://www.libreoffice.org/download/

If the bug is present, please leave a comment that includes the information from Help - About LibreOffice.
 
If the bug is NOT present, please set the bug's Status field to RESOLVED-WORKSFORME and leave a comment that includes the information from Help - About LibreOffice.

Please DO NOT

Update the version field
Reply via email (please reply directly on the bug tracker)
Set the bug's Status field to RESOLVED - FIXED (this status has a particular meaning that is not 
appropriate in this case)


If you want to do more to help you can test to see if your issue is a REGRESSION. To do so:
1. Download and install oldest version of LibreOffice (usually 3.3 unless your bug pertains to a feature added after 3.3) from https://downloadarchive.documentfoundation.org/libreoffice/old/

2. Test your bug
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