** Changed in: linux (Ubuntu Zesty)
Status: In Progress => Fix Committed
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https://bugs.launchpad.net/bugs/1702749
Title:
arm64: fix crash reading /proc/kcore
Status in linux package in Ubuntu:
Fix Committed
Status in linux source package in Zesty:
Fix Committed
Bug description:
[Impact]
Reading /proc/kcore can lead to a crash on arm64 systems.
This was found to cause crashes when, e.g. annotating symbols in a perf top
session.
[Test Case]
# cat /proc/kcore > /dev/null
[Regression Risk]
2 upstream patches need to be cherry-picked to fix this.
The 1st patch is a simplification to the kcore driver that impacts all
architectures. Instead of re-checking at read time for vmalloc/module
addresses, it just checks for a flag that was set during kcore driver
init. This looks correct to me but could of course have an unnoticed
bug.
The second patch is arm64-specific, and regression risk has been
mitigated by testing on arm64 hardware.
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