# SPDX-License-Identifier: GPL-2.0-only
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config EVM
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bool "EVM support"
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select KEYS
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select ENCRYPTED_KEYS
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select CRYPTO_HMAC
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select CRYPTO_SHA1
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select CRYPTO_HASH_INFO
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default n
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help
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EVM protects a file's security extended attributes against
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integrity attacks.
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If you are unsure how to answer this question, answer N.
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config EVM_ATTR_FSUUID
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bool "FSUUID (version 2)"
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default y
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depends on EVM
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help
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Include filesystem UUID for HMAC calculation.
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Default value is 'selected', which is former version 2.
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if 'not selected', it is former version 1
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WARNING: changing the HMAC calculation method or adding
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additional info to the calculation, requires existing EVM
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labeled file systems to be relabeled.
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config EVM_EXTRA_SMACK_XATTRS
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bool "Additional SMACK xattrs"
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depends on EVM && SECURITY_SMACK
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default n
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help
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Include additional SMACK xattrs for HMAC calculation.
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In addition to the original security xattrs (eg. security.selinux,
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security.SMACK64, security.capability, and security.ima) included
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in the HMAC calculation, enabling this option includes newly defined
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Smack xattrs: security.SMACK64EXEC, security.SMACK64TRANSMUTE and
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security.SMACK64MMAP.
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WARNING: changing the HMAC calculation method or adding
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additional info to the calculation, requires existing EVM
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labeled file systems to be relabeled.
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config EVM_ADD_XATTRS
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bool "Add additional EVM extended attributes at runtime"
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depends on EVM
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default n
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help
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Allow userland to provide additional xattrs for HMAC calculation.
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When this option is enabled, root can add additional xattrs to the
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list used by EVM by writing them into
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/sys/kernel/security/integrity/evm/evm_xattrs.
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config EVM_LOAD_X509
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bool "Load an X509 certificate onto the '.evm' trusted keyring"
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depends on EVM && INTEGRITY_TRUSTED_KEYRING
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default n
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help
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Load an X509 certificate onto the '.evm' trusted keyring.
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This option enables X509 certificate loading from the kernel
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onto the '.evm' trusted keyring. A public key can be used to
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verify EVM integrity starting from the 'init' process.
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config EVM_X509_PATH
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string "EVM X509 certificate path"
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depends on EVM_LOAD_X509
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default "/etc/keys/x509_evm.der"
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help
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This option defines X509 certificate path.
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