diff options
| author | Marco Elver <elver@google.com> | 2023-06-14 11:51:16 +0200 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2023-06-19 16:19:33 -0700 |
| commit | 452c03fdbed0d19f907c877a6a9edd226b1ebad9 (patch) | |
| tree | 70957163befd546b5eaa29cc561f7862e3b7b34b /Documentation/dev-tools/kasan.rst | |
| parent | cb0551adf92dac140d0e0958b4aaa860348bedbb (diff) | |
kasan: add support for kasan.fault=panic_on_write
KASAN's boot time kernel parameter 'kasan.fault=' currently supports
'report' and 'panic', which results in either only reporting bugs or also
panicking on reports.
However, some users may wish to have more control over when KASAN reports
result in a kernel panic: in particular, KASAN reported invalid _writes_
are of special interest, because they have greater potential to corrupt
random kernel memory or be more easily exploited.
To panic on invalid writes only, introduce 'kasan.fault=panic_on_write',
which allows users to choose to continue running on invalid reads, but
panic only on invalid writes.
Link: https://lkml.kernel.org/r/20230614095158.1133673-1-elver@google.com
Signed-off-by: Marco Elver <elver@google.com>
Reviewed-by: Alexander Potapenko <glider@google.com>
Cc: Aleksandr Nogikh <nogikh@google.com>
Cc: Andrey Konovalov <andreyknvl@gmail.com>
Cc: Andrey Ryabinin <ryabinin.a.a@gmail.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Taras Madan <tarasmadan@google.com>
Cc: Vincenzo Frascino <vincenzo.frascino@arm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'Documentation/dev-tools/kasan.rst')
| -rw-r--r-- | Documentation/dev-tools/kasan.rst | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/Documentation/dev-tools/kasan.rst b/Documentation/dev-tools/kasan.rst index e66916a483cd..7f37a46af574 100644 --- a/Documentation/dev-tools/kasan.rst +++ b/Documentation/dev-tools/kasan.rst @@ -107,9 +107,10 @@ effectively disables ``panic_on_warn`` for KASAN reports. Alternatively, independent of ``panic_on_warn``, the ``kasan.fault=`` boot parameter can be used to control panic and reporting behaviour: -- ``kasan.fault=report`` or ``=panic`` controls whether to only print a KASAN - report or also panic the kernel (default: ``report``). The panic happens even - if ``kasan_multi_shot`` is enabled. +- ``kasan.fault=report``, ``=panic``, or ``=panic_on_write`` controls whether + to only print a KASAN report, panic the kernel, or panic the kernel on + invalid writes only (default: ``report``). The panic happens even if + ``kasan_multi_shot`` is enabled. Software and Hardware Tag-Based KASAN modes (see the section about various modes below) support altering stack trace collection behavior: |