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Subject: [PATCH v2 0/3] kexec: Add new parameter to limit the access to kexec
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From:   Ricardo Ribalda <ribalda@chromium.org>
Date:   Thu, 08 Dec 2022 17:37:59 +0100
Message-Id: <20221114-disable-kexec-reset-v2-0-c498313c1bb5@chromium.org>
To:     Philipp Rudo <prudo@redhat.com>,
        Eric Biederman <ebiederm@xmission.com>,
        Jonathan Corbet <corbet@lwn.net>
Cc:     linux-doc@vger.kernel.org, Ricardo Ribalda <ribalda@chromium.org>,
        Steven Rostedt <rostedt@goodmis.org>,
        "Joel Fernandes (Google)" <joel@joelfernandes.org>,
        kexec@lists.infradead.org,
        Sergey Senozhatsky <senozhatsky@chromium.org>,
        Ross Zwisler <zwisler@kernel.org>, linux-kernel@vger.kernel.org
Precedence: bulk

Add two parameter to specify how many times a kexec kernel can be loaded.

These parameter allow hardening the system.

While we are at it, fix a documentation issue and refactor some code.

To: Jonathan Corbet <corbet@lwn.net>
To: Eric Biederman <ebiederm@xmission.com>
Cc: linux-doc@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Cc: kexec@lists.infradead.org
Cc: Joel Fernandes (Google) <joel@joelfernandes.org>
Cc: Sergey Senozhatsky <senozhatsky@chromium.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Ross Zwisler <zwisler@kernel.org>
To: Philipp Rudo <prudo@redhat.com>
Signed-off-by: Ricardo Ribalda <ribalda@chromium.org>

---
Changes in v2:
- Instead of kexec_reboot_disabled, add two new counters (Thanks Philipp!)
- Link to v1: https://lore.kernel.org/r/20221114-disable-kexec-reset-v1-0-fb51d20cf871@chromium.org

---
Ricardo Ribalda (3):
      Documentation: sysctl: Correct kexec_load_disabled
      kexec: Factor out kexec_load_permited
      kexec: Introduce paramters load_limit_reboot and load_limit_panic

 Documentation/admin-guide/kernel-parameters.txt | 14 ++++
 Documentation/admin-guide/sysctl/kernel.rst     |  7 +-
 include/linux/kexec.h                           |  3 +-
 kernel/kexec.c                                  |  2 +-
 kernel/kexec_core.c                             | 98 ++++++++++++++++++++++++-
 kernel/kexec_file.c                             |  2 +-
 6 files changed, 119 insertions(+), 7 deletions(-)
---
base-commit: 479174d402bcf60789106eedc4def3957c060bad
change-id: 20221114-disable-kexec-reset-19b7e117338f

Best regards,
-- 
Ricardo Ribalda <ribalda@chromium.org>