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[80.71.134.83]) by smtp.gmail.com with ESMTPSA id f24-20020a056402005800b0046cbcc86bdesm7382008edu.7.2022.12.21.11.46.09 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 21 Dec 2022 11:46:10 -0800 (PST) Subject: [PATCH v5 0/3] kexec: Add new parameter to limit the access to kexec MIME-Version: 1.0 X-B4-Tracking: v=1; b=H4sIAHRio2MC/43NwarCMBAF0F+RrI10ktQmb/X+Q1wkk4kN1hYSLY r03x1cikhXw71wzzxFpZKpir/NUxSac83TyKHdbgT2fjyRzJGzUI1SAGBkzNWHgeSZ7oSyUKWrBB c6Aui0tknwMvhKMhQ/Ys/b8TYMXPa5XqfyeH+agc/hNzqDbGQKLUTVYLId/GNfpku+XXZTOYkjk7 NawShm0DirQSOE0H5h9ApGM2MoGXLK+Zj2XxizgjHM+GAbhzY6a/GDWZblBd8zzw2TAQAA From: Ricardo Ribalda Date: Wed, 21 Dec 2022 20:45:56 +0100 Message-Id: <20221114-disable-kexec-reset-v5-0-1bd37caf3c75@chromium.org> To: "Guilherme G. Piccoli" , Eric Biederman , Jonathan Corbet , Philipp Rudo Cc: Ross Zwisler , Sergey Senozhatsky , Steven Rostedt , kexec@lists.infradead.org, Ricardo Ribalda , "Joel Fernandes (Google)" , linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org X-Mailer: b4 0.11.0-dev-696ae X-Developer-Signature: v=1; a=openpgp-sha256; l=2328; i=ribalda@chromium.org; h=from:subject:message-id; bh=pHYAwK2HBx9n8zpILJY4+z4Vwehv4LFp5obwLjvJPUI=; b=owEBbQKS/ZANAwAKAdE30T7POsSIAcsmYgBjo2J2bQVimyy1/Vsjq4S0a4azyR8AdmG30PBxAZnh G4wJW8GJAjMEAAEKAB0WIQREDzjr+/4oCDLSsx7RN9E+zzrEiAUCY6NidgAKCRDRN9E+zzrEiI/FEA CG6+MF4+l8zL5dE4Gt3+i0jiytzzPAhfXFs4fHRSCsUD2O2MNBscf1A4mFZLPnTaW7vBMNVrfFEufO 7gIESmiyNGt6ayHX1VooSQ1ShQsdAWtyVGe1W6o4w6yeO83drpRi+sU/5OpDYnpEASg0y+NSwRqzAZ Z+nysGMjXUNaB+2sTaWHHEFHRM7ALV7br6WhBL2WCHQTTSVE6XpRl7twTUn3Yhcef9ec0pX+jduF4g ScjmpYOqWv5hXqMymVLqbg/BjCGdVWVuWcfFdp7JIEmC73e15DUmlJRpZ9cyUk20l61NuMK2R4vRqx B6LzBRyuBMFF0SupmUNcjJRZsniObm/UscQJdm/zeX5TLZ9jo5iPjHGLwAsTEzb/hr8uaymqCyka2Z 0MST/nj60mrMDj5cTcvVfdglJxBr/RgDggDuGPbLNYUMacpuQWqR/IarPTHekEP3MJRWLll+Gse4i5 i0I0ECLpz6rDav25LJLgdE/4Nk+5fqUI5glc5OmDmkhlD95fzmg5DSpFUCf70EMQb0w57j9SFbWwcX tStaxYotNcUOSxPw+TUcc3RL504iw0GF8kKxKmBAiFHVEB/K1CHUXy4D8oo3q7GVk1IAnGAwDsMzWf bP2mw6WT2gEgAAPMNLnnG9094iJ41CQS6r/kA3eIYyo1cPjcJHKui7ZnTSQw== X-Developer-Key: i=ribalda@chromium.org; a=openpgp; fpr=9EC3BB66E2FC129A6F90B39556A0D81F9F782DA9 X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_NONE, SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1752828009620844371?= X-GMAIL-MSGID: =?utf-8?q?1752854228499452043?= 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 Reviewed-by: Steven Rostedt (Google) --- 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,