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[80.71.134.83]) by smtp.gmail.com with ESMTPSA id ku13-20020a170907788d00b00837ac146a53sm1175492ejc.23.2022.12.20.14.06.05 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 20 Dec 2022 14:06:05 -0800 (PST) Subject: [PATCH v3 0/3] kexec: Add new parameter to limit the access to kexec MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit X-B4-Tracking: v=1; b=H4sIALYxomMC/43NQQqDMBAF0KtI1p3iJIraVe9RukjiaELVQKKhRb x7hy67KF0N/8N/s4tE0VMSl2IXkbJPPiwc1KkQ1ullJPA9ZyFLKRGxgt4nbSaCBz3JQqREK2BnGk JslGoHwUujE4GJerGOt8s2TVw6n9YQX59PGfncfqMZoYTB1NjL0g5tg1frYpj9Np9DHMWdySz/YC QztupahcqiMfUXcxzHGztA9xsFAQAA From: Ricardo Ribalda Date: Tue, 20 Dec 2022 23:05:42 +0100 Message-Id: <20221114-disable-kexec-reset-v3-0-4ef4e929adf6@chromium.org> To: Philipp Rudo , Eric Biederman , Jonathan Corbet , "Guilherme G. Piccoli" Cc: linux-doc@vger.kernel.org, Sergey Senozhatsky , Steven Rostedt , linux-kernel@vger.kernel.org, "Joel Fernandes (Google)" , Ricardo Ribalda , Ross Zwisler , kexec@lists.infradead.org X-Mailer: b4 0.11.0-dev-696ae X-Developer-Signature: v=1; a=openpgp-sha256; l=1912; i=ribalda@chromium.org; h=from:subject:message-id; bh=oqqxwk7ur+7vMvrJ1y110OEyC4kpNJWaizp+/KtIfaM=; b=owEBbQKS/ZANAwAKAdE30T7POsSIAcsmYgBjojG4Me5Y6xAi+85V5xL3fNRPfkdN7GpnFJ5jXJXt 3b8EXpGJAjMEAAEKAB0WIQREDzjr+/4oCDLSsx7RN9E+zzrEiAUCY6IxuAAKCRDRN9E+zzrEiGx/EA CHRNxJxeuVSxaapNclsd0IR2v561HSo/3zhW/RH7NG2VBrxbPwzBolyjgfbRMakKqbztlmWf7etZ/S Ep8ev+3WFlQsbehkKTh6z8lDHwTvFKMv0rTH2vOngOJA6pmqJht/zB4OPbSPyvOOkZNQ29mIp/liFj EKBwrxpy5Y7uvfuZ7Q1DDtI5rMrKl4AxGI3wrv/FS46xCOpiRfoNcxuH2fUR+ZzHW5aFmq7qw1LfQJ ZiH9lBk8S1JbySrhQGdPQ1HCWi78T3R9NRtUvTnW9LeUrqBTiRZuoYHucvGQS/uAsB1BinY3LCbGhs diuRkD2qfJU++eGUxoJjo2ZVOGkGTKm3HURUutGJlo7Yq488PpyKU7gyZSvSdhapopQGyFiepkRJus WrXhAwVwoL+wCnSWYiJvZz8CNZRsCM+fofRYyUWiujR1sdFWx0okvhcCcWSloR5/VkO+98PYy5h1sP L2P/mWyVFAR6C9hXQCKkq1TRuZCglgRtM2Etmuwa4ZfvrdmKdUzvaetSwU7GrCy7PHpq4oFRpj/eL/ kRe+5rIF5PpKoHnOuhkTiPsSQntBm+wep0iu3tiZ1Phzj3c2MFkZfdY7NpethPomAo8bq3ygEFlWp8 80QP1c/4+/QjU2g780bLf1Ux8QBvaOA0TokD2Y9MPRfDXTbLA9nAh1WKUHOg== X-Developer-Key: i=ribalda@chromium.org; a=openpgp; fpr=9EC3BB66E2FC129A6F90B39556A0D81F9F782DA9 Precedence: bulk List-ID: X-Mailing-List: linux-doc@vger.kernel.org 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 To: Eric Biederman Cc: linux-doc@vger.kernel.org Cc: linux-kernel@vger.kernel.org Cc: kexec@lists.infradead.org Cc: Joel Fernandes (Google) Cc: Sergey Senozhatsky Cc: Steven Rostedt Cc: Ross Zwisler To: Philipp Rudo To: Guilherme G. Piccoli Signed-off-by: Ricardo Ribalda --- 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 parameters 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