[CRM] Safety check for division by 0 #1569
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lguohan
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Dec 26, 2020
yxieca
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Feb 17, 2021
Check if divisor is 0. If yes, log warning and skip division
prsunny
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Nov 16, 2021
*Test divide by zero processing path. Add vs test coverage for #1569 Signed-off-by: Wenda Ni <wonda.ni@gmail.com>
EdenGri
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Feb 28, 2022
What I did There is a bug that occasionally turn root-overlay as RO. This makes /etc & /home as RO. This blocks any new remote user login, as that needs to write into /etc & /home. This tool scans /etc & /home (or given dirs) as in RW or RO state. If RO, it could create a writable overlay using tmpfs. This is transient and stays until next reboot. Any write after the overlay will be lost upon reboot. But this allows new remote users login. How I did it Create upper & work dirs in /run/mount (tmpfs). Mount /etc & /home as lowerdirs and use the same name for final merge. This allows anyone opening a file in /etc or /home to operate on the merged overlay, transparently. How to verify it Mount any dir on tmpfs ( mount -t tmpfs tmpfs test_dir) remount as RO (mount -o remount,ro test_dir) Pass that dir to this script. (disk_check.py -d ./test_dir) Now it should be RW
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What I did
Check if divisor is 0. If yes, log warning and skip division
Why I did it
Safety check to avoid exception and crash.
How I verified it
Details if related