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# Prevent a kernel which is missing IMA-appraisal support, from changing all extended attributes with a key that is not provided in EVM ima_appraise=fix # Prevent a kernel which has IMA-appraisal active from updating the'security.ima' extended attribute ima_appraise_tcb=1 boot ima file download To activate the directory isolation config, you must reload sysctls and reboot the system:To revert to a previous security model, remove the 'ima_appraise=fix' boot option, change ima_appraise=1 to ima_appraise_tcb=1 in the sysctl config file and relabel the filesystem. IMA-appraisal can be disabled in the kernel with the boot command line option ima_appraise_tcb=0. Refer to the IMA appraisal man page, if you plan to change this value in the kernel, or have questions.If an app has the 'IMA_AUTH' capability, after rebooting, all the metadata needs to be appraised. This is accomplished by invoking the ima_appraise() module function, passing its module parameter to it. This is done by the ima_load_appraise_template() function, which does the following: Sets a template by which appraise() function will be called Loads an appraise template by which appraise() function will be called Call appraise() function with relevant metadata. $ ima_load_appraise_template(<plib@USEDK-NAME-<pdev-NAME@CONN<dev-NAME@FILE@); The <plib@USEDK-NAME-<pdev-NAME@CONN<dev-NAME@FILE@ is a macro value defined in ima-appraise.h header file.static const struct ima_template *appraise_templates[] = { , , , }; boot ima file download After rebooting, appraise() function was invoked. If the function returns a value of '1', the metadata was verified for integrity. If the function returns a value of '0', the metadata was appraised. This is used for the 'rsasig' signing key. Some appraised metadata are only shown for the i_version file for the purposes of debugging.
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