Re: Issue with medm's PV Info Message on Ubuntu 24.04

["Soliday, Robert T. via Tech-talk" <tech-talk at aps.anl.gov>]

I have approved the changes in your github pull request and added them to a new release.

Thanks,

--Bob Soliday

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From: Tech-talk <tech-talk-bounces at aps.anl.gov> on behalf of Sang-Woo Kim via Tech-talk <tech-talk at aps.anl.gov>
Sent: Friday, May 31, 2024 2:38 AM
To: tech-talk at aps.anl.gov <tech-talk at aps.anl.gov>
Subject: Issue with medm's PV Info Message on Ubuntu 24.04

 

Dear Techtalk Community,

I am writing to bring to your attention an issue we encountered with the PV Info message in the medm application on Ubuntu 24.04. The use of `sprintf` for overlapping buffer read/write operations has led to undefined behavior. The `sprintf` function was reading from and writing to the same buffer, causing memory overlap issues and unexpected results.

We have addressed this problem by replacing `sprintf` with `snprintf`, ensuring safe string concatenation and buffer management. The changes have been tested on Ubuntu 24.04 and have resolved the issue.

For more details, you can review the pull request here: https://github.com/epics-extensions/medm/pull/8

Best regards,

Sang-Woo Kim
PLS-II, PAL, South Korea