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kfence: add kfence.fault parameter

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Add kfence.fault parameter to control the behavior when a KFENCE error is
detected (similar in spirit to kasan.fault=<mode>).

The supported modes for kfence.fault=<mode> are:

  - report: print the error report and continue (default).
  - oops: print the error report and oops.
  - panic: print the error report and panic.

In particular, the 'oops' mode offers a trade-off between no mitigation
on report and panicking outright (if panic_on_oops is not set).

Link: https://lkml.kernel.org/r/20260225203639.3159463-1-elver@google.com
Signed-off-by: Marco Elver <elver@google.com>
Reviewed-by: Alexander Potapenko <glider@google.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Kees Cook <kees@kernel.org>
Cc: Shuah Khan <skhan@linuxfoundation.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Marco Elver
2026-02-25 21:36:05 +01:00
committed by Andrew Morton
parent 3efb980055
commit da735962d0
5 changed files with 89 additions and 12 deletions
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6
Documentation/admin-guide/kernel-parameters.txt
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@@ -2959,6 +2959,12 @@ Kernel parameters
Format: <bool>
Default: CONFIG_KFENCE_DEFERRABLE
kfence.fault= [MM,KFENCE] Controls the behavior when a KFENCE
error is detected.
report - print the error report and continue (default).
oops - print the error report and oops.
panic - print the error report and panic.
kfence.sample_interval=
[MM,KFENCE] KFENCE's sample interval in milliseconds.
Format: <unsigned integer>