Messages in this thread | | | Subject | [PATCH v5 0/3] kexec: Add new parameter to limit the access to kexec | From | Ricardo Ribalda <> | Date | Wed, 21 Dec 2022 20:45:56 +0100 |
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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> To: Guilherme G. Piccoli <gpiccoli@igalia.com> Signed-off-by: Ricardo Ribalda <ribalda@chromium.org>
--- Changes in v5: - Remove maxlen from ctl_table. Thanks Steven! - Link to v4: https://lore.kernel.org/r/20221114-disable-kexec-reset-v4-0-ab809c8d988c@chromium.org
Changes in v4 (Thanks Steven!): - Uses sysctl instead or module_parameters - Pass image type instead of boolean to permitted - Fix typo on flag handling - Return -EINVAL for values that does not change the current value. - Link to v3: https://lore.kernel.org/r/20221114-disable-kexec-reset-v3-0-4ef4e929adf6@chromium.org
Changes in v3: - s/paramter/parameter/ Thanks Ghilherme! - s/permited/permitted/ Thanks Joel! - Link to v2: https://lore.kernel.org/r/20221114-disable-kexec-reset-v2-0-c498313c1bb5@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_permitted kexec: Introduce sysctl parameters kexec_load_limit_*
Documentation/admin-guide/sysctl/kernel.rst | 25 +++++++- include/linux/kexec.h | 3 +- kernel/kexec.c | 4 +- kernel/kexec_core.c | 94 ++++++++++++++++++++++++++++- kernel/kexec_file.c | 11 ++-- 5 files changed, 127 insertions(+), 10 deletions(-) --- base-commit: 479174d402bcf60789106eedc4def3957c060bad change-id: 20221114-disable-kexec-reset-19b7e117338f
Best regards, -- Ricardo Ribalda <ribalda@chromium.org>
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