1 files changed, 68 insertions, 0 deletions

diff --git a/init/Kconfig b/init/Kconfig
index 89e4cf672dfe..6fdd6e339326 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -1574,6 +1574,66 @@ config MODULE_SRCVERSION_ALL
           the version).  With this option, such a "srcversion" field
           will be created for all modules.  If unsure, say N.
 
+config MODULE_SIG
+        bool "Module signature verification"
+        depends on MODULES
+        select KEYS
+        select CRYPTO
+        select ASYMMETRIC_KEY_TYPE
+        select ASYMMETRIC_PUBLIC_KEY_SUBTYPE
+        select PUBLIC_KEY_ALGO_RSA
+        select ASN1
+        select OID_REGISTRY
+        select X509_CERTIFICATE_PARSER
+        help
+          Check modules for valid signatures upon load: the signature
+          is simply appended to the module. For more information see
+          Documentation/module-signing.txt.
+
+          !!!WARNING!!!  If you enable this option, you MUST make sure that the
+          module DOES NOT get stripped after being signed.  This includes the
+          debuginfo strip done by some packagers (such as rpmbuild) and
+          inclusion into an initramfs that wants the module size reduced.
+
+config MODULE_SIG_FORCE
+        bool "Require modules to be validly signed"
+        depends on MODULE_SIG
+        help
+          Reject unsigned modules or signed modules for which we don't have a
+          key.  Without this, such modules will simply taint the kernel.
+
+choice
+        prompt "Which hash algorithm should modules be signed with?"
+        depends on MODULE_SIG
+        help
+          This determines which sort of hashing algorithm will be used during
+          signature generation.  This algorithm _must_ be built into the kernel
+          directly so that signature verification can take place.  It is not
+          possible to load a signed module containing the algorithm to check
+          the signature on that module.
+
+config MODULE_SIG_SHA1
+        bool "Sign modules with SHA-1"
+        select CRYPTO_SHA1
+
+config MODULE_SIG_SHA224
+        bool "Sign modules with SHA-224"
+        select CRYPTO_SHA256
+
+config MODULE_SIG_SHA256
+        bool "Sign modules with SHA-256"
+        select CRYPTO_SHA256
+
+config MODULE_SIG_SHA384
+        bool "Sign modules with SHA-384"
+        select CRYPTO_SHA512
+
+config MODULE_SIG_SHA512
+        bool "Sign modules with SHA-512"
+        select CRYPTO_SHA512
+
+endchoice
+
 endif # MODULES
 
 config INIT_ALL_POSSIBLE
@@ -1607,4 +1667,12 @@ config PADATA
 config BROKEN_RODATA
         bool
 
+config ASN1
+        tristate
+        help
+          Build a simple ASN.1 grammar compiler that produces a bytecode output
+          that can be interpreted by the ASN.1 stream decoder and used to
+          inform it as to what tags are to be expected in a stream and what
+          functions to call on what tags.
+
 source "kernel/Kconfig.locks"