** Description changed:
[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.
** Also affects: linux (Ubuntu Zesty)
Importance: Undecided
Status: New
** Changed in: linux (Ubuntu Zesty)
Status: New => In Progress
** Changed in: linux (Ubuntu)
Status: Confirmed => In Progress
** Changed in: linux (Ubuntu Zesty)
Assignee: (unassigned) => dann frazier (dannf)
** Changed in: linux (Ubuntu)
Importance: Undecided => High
** Changed in: linux (Ubuntu Zesty)
Importance: Undecided => High
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https://bugs.launchpad.net/bugs/1702749
Title:
arm64: fix crash reading /proc/kcore
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