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Piccoli" Cc: kexec@lists.infradead.org, Ricardo Ribalda , Ross Zwisler , Steven Rostedt , "Joel Fernandes (Google)" , Sergey Senozhatsky , 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=2161; i=ribalda@chromium.org; h=from:subject:message-id; bh=VBCVJ+aD/h3GyICYpp+9hUZz7wDvOWS2v3+hHEeVJG0=; b=owEBbQKS/ZANAwAKAdE30T7POsSIAcsmYgBjowD7/oKW4m0F/oh1hjb/+F27kY8sEEjovm4nldnc ++mdDAKJAjMEAAEKAB0WIQREDzjr+/4oCDLSsx7RN9E+zzrEiAUCY6MA+wAKCRDRN9E+zzrEiCRiD/ 4v6YHmqUA36mCtnhhZgNBiEwdUEvmgxZ0WLQ4heB78T72NPYXMF09anLaJ0p7l9FdGBGNT8FA6eQX6 GQ15UnOLfNCaGiI/XMktb6T29UUA0gIGq7ohW6vzrUJnHk90jo8cCv5cQGQFZFyHPQGZWE9CYBzkgB WsJEXQnvLfqGLfXW8XiBP2eWlUINVEyMsD60u/ZejcyICdnllmnY3gjCCg5wIRQQXDh4H1dT6MSMev 4XFxYK25FDX3N5xFTmdynwhI2rhSfxrZuzUjOQg9g4sL6Bhi4jsZOwOLJKADo/maI/Fk7cjfbyKCOu r7ZsRslYNoVOvTkdqlaXW+OPbGDHWwboSFtoY2B0yKURuz1q476QsDy+2oqi4dwhlJLkKjNpjCK9Ur oRmVio+DnU1g5F3x8dcOMO4ig6LNM+i39llbr82wzYrmpbyH/8o84fmXXWVdcxTGSI3g3muSijaL5X 3I1Gr7LRTn8ed42PY5sJy3FQp5EO0BpB7+zB3trHkYwieE3tgLvXEWR1oSl6NDVycl9AabG3Hdm1+I cYBCqGkabyDdzpOMzrARBMdldMekG2cOzqeznE1ru8e+Rz4N6VADI1cVvzpZ5Ku490beZmS64FgK+g wrPGrb0s45Ggx/t6+rvZdjIBLsohAJeqd4XK4fJdOXy/EUvBtgRxRf1V12Gw== 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?1752828009620844371?= 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 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 | 96 ++++++++++++++++++++++++++++- kernel/kexec_file.c | 11 ++-- 5 files changed, 129 insertions(+), 10 deletions(-) --- base-commit: 479174d402bcf60789106eedc4def3957c060bad change-id: 20221114-disable-kexec-reset-19b7e117338f Best regards,