Public bug reported:
On Bluefield platforms, the 'bfrshlog' script can be used to write a
string into the internal rshim logging buffer which has size 1KB. When
the buffer is full, the intention is to drop the new data. However, due
to a bug, the buffer could be overwritten and wrap-around when full.
SRU Justification:
[Impact]
* When 'cat /dev/rshim/misc' with DISPLAY_LEVEL set to 2, the logging buffer
could be potentially displayed as empty when it's full.
[Fix]
* Add the check properly to make sure the buffer won't wrap-around.
[Test Case]
* Run "bfrshlog <some-message>" repeatedly and check the /dev/rshim/misc with
DISPLAY_LEVEL set to 2 in this file. The buffer shouldn't be overwritten or
wrap-around.
[Regression Potential]
* Yes, it should be easy to add regression.
[Other]
* N/A
** Affects: linux-bluefield (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1919847
Title:
rshim logging buffer could overflow and get lost
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