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livepatch: force transition to finish

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If a task sleeps in a set of patched functions uninterruptedly, it could
block the whole transition indefinitely.  Thus it may be useful to clear
its TIF_PATCH_PENDING to allow the process to finish.

Admin can do that now by writing to force sysfs attribute in livepatch
sysfs directory. TIF_PATCH_PENDING is then cleared for all tasks and the
transition can finish successfully.

Important note! Administrator should not use this feature without a
clearance from a patch distributor. It must be checked that by doing so
the consistency model guarantees are not violated. Removal (rmmod) of
patch modules is permanently disabled when the feature is used. It
cannot be guaranteed there is no task sleeping in such module.

Signed-off-by: Miroslav Benes <[email protected]>
Acked-by: Josh Poimboeuf <[email protected]>
Reviewed-by: Petr Mladek <[email protected]>
Signed-off-by: Jiri Kosina <[email protected]>
This commit is contained in:
Miroslav Benes 2017-11-22 11:29:21 +01:00 • committed by Jiri Kosina
commit c99a2be790
5 changed files with 95 additions and 4 deletions
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14
Documentation/ABI/testing/sysfs-kernel-livepatch
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@ -45,6 +45,20 @@ Description:
signal pending structures). Tasks are interrupted or woken up,
and forced to change their patched state.
What: /sys/kernel/livepatch/<patch>/force
Date: Nov 2017
KernelVersion: 4.15.0
Contact: [email protected]
Description:
A writable attribute that allows administrator to affect the
course of an existing transition. Writing 1 clears
TIF_PATCH_PENDING flag of all tasks and thus forces the tasks to
the patched or unpatched state. Administrator should not
use this feature without a clearance from a patch
distributor. Removal (rmmod) of patch modules is permanently
disabled when the feature is used. See
Documentation/livepatch/livepatch.txt for more information.
What: /sys/kernel/livepatch/<patch>/<object>
Date: Nov 2014
KernelVersion: 3.19.0