* [merged] kasan-docs-update-boot-parameters-section.patch removed from -mm tree
@ 2021-05-08 22:44 akpm
0 siblings, 0 replies; only message in thread
From: akpm @ 2021-05-08 22:44 UTC (permalink / raw)
To: andreyknvl, aryabinin, dvyukov, elver, glider, mm-commits
The patch titled
Subject: kasan: docs: update boot parameters section
has been removed from the -mm tree. Its filename was
kasan-docs-update-boot-parameters-section.patch
This patch was dropped because it was merged into mainline or a subsystem tree
------------------------------------------------------
From: Andrey Konovalov <andreyknvl@google.com>
Subject: kasan: docs: update boot parameters section
Update the "Boot parameters" section in KASAN documentation:
- Mention panic_on_warn.
- Mention kasan_multi_shot and its interaction with panic_on_warn.
- Clarify kasan.fault=panic interaction with panic_on_warn.
- A readability clean-up.
Link: https://lkml.kernel.org/r/01364952f15789948f0627d6733b5cdf5209f83a.1615559068.git.andreyknvl@google.com
Signed-off-by: Andrey Konovalov <andreyknvl@google.com>
Reviewed-by: Marco Elver <elver@google.com>
Cc: Alexander Potapenko <glider@google.com>
Cc: Andrey Ryabinin <aryabinin@virtuozzo.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
Documentation/dev-tools/kasan.rst | 14 ++++++++++----
1 file changed, 10 insertions(+), 4 deletions(-)
--- a/Documentation/dev-tools/kasan.rst~kasan-docs-update-boot-parameters-section
+++ a/Documentation/dev-tools/kasan.rst
@@ -174,10 +174,16 @@ call_rcu() and workqueue queuing.
Boot parameters
~~~~~~~~~~~~~~~
+KASAN is affected by the generic ``panic_on_warn`` command line parameter.
+When it is enabled, KASAN panics the kernel after printing a bug report.
+
+By default, KASAN prints a bug report only for the first invalid memory access.
+With ``kasan_multi_shot``, KASAN prints a report on every invalid access. This
+effectively disables ``panic_on_warn`` for KASAN reports.
+
Hardware tag-based KASAN mode (see the section about various modes below) is
intended for use in production as a security mitigation. Therefore, it supports
-boot parameters that allow to disable KASAN competely or otherwise control
-particular KASAN features.
+boot parameters that allow disabling KASAN or controlling its features.
- ``kasan=off`` or ``=on`` controls whether KASAN is enabled (default: ``on``).
@@ -194,8 +200,8 @@ particular KASAN features.
traces collection (default: ``on``).
- ``kasan.fault=report`` or ``=panic`` controls whether to only print a KASAN
- report or also panic the kernel (default: ``report``). Note, that tag
- checking gets disabled after the first reported bug.
+ report or also panic the kernel (default: ``report``). The panic happens even
+ if ``kasan_multi_shot`` is enabled.
Implementation details
----------------------
_
Patches currently in -mm which might be from andreyknvl@google.com are
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2021-05-08 22:44 [merged] kasan-docs-update-boot-parameters-section.patch removed from -mm tree akpm
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