1menu "Certificates for signature checking" 2 3config MODULE_SIG_KEY 4 string "File name or PKCS#11 URI of module signing key" 5 default "certs/signing_key.pem" 6 depends on MODULE_SIG 7 help 8 Provide the file name of a private key/certificate in PEM format, 9 or a PKCS#11 URI according to RFC7512. The file should contain, or 10 the URI should identify, both the certificate and its corresponding 11 private key. 12 13 If this option is unchanged from its default "certs/signing_key.pem", 14 then the kernel will automatically generate the private key and 15 certificate as described in Documentation/module-signing.txt 16 17config SYSTEM_TRUSTED_KEYRING 18 bool "Provide system-wide ring of trusted keys" 19 depends on KEYS 20 help 21 Provide a system keyring to which trusted keys can be added. Keys in 22 the keyring are considered to be trusted. Keys may be added at will 23 by the kernel from compiled-in data and from hardware key stores, but 24 userspace may only add extra keys if those keys can be verified by 25 keys already in the keyring. 26 27 Keys in this keyring are used by module signature checking. 28 29config SYSTEM_TRUSTED_KEYS 30 string "Additional X.509 keys for default system keyring" 31 depends on SYSTEM_TRUSTED_KEYRING 32 help 33 If set, this option should be the filename of a PEM-formatted file 34 containing trusted X.509 certificates to be included in the default 35 system keyring. Any certificate used for module signing is implicitly 36 also trusted. 37 38 NOTE: If you previously provided keys for the system keyring in the 39 form of DER-encoded *.x509 files in the top-level build directory, 40 those are no longer used. You will need to set this option instead. 41 42config SYSTEM_EXTRA_CERTIFICATE 43 bool "Reserve area for inserting a certificate without recompiling" 44 depends on SYSTEM_TRUSTED_KEYRING 45 help 46 If set, space for an extra certificate will be reserved in the kernel 47 image. This allows introducing a trusted certificate to the default 48 system keyring without recompiling the kernel. 49 50config SYSTEM_EXTRA_CERTIFICATE_SIZE 51 int "Number of bytes to reserve for the extra certificate" 52 depends on SYSTEM_EXTRA_CERTIFICATE 53 default 4096 54 help 55 This is the number of bytes reserved in the kernel image for a 56 certificate to be inserted. 57 58endmenu 59