From 106a4ee258d14818467829bf0e12aeae14c16cd7 Mon Sep 17 00:00:00 2001 From: Rusty Russell Date: Wed, 26 Sep 2012 10:09:40 +0100 Subject: module: signature checking hook We do a very simple search for a particular string appended to the module (which is cache-hot and about to be SHA'd anyway). There's both a config option and a boot parameter which control whether we accept or fail with unsigned modules and modules that are signed with an unknown key. If module signing is enabled, the kernel will be tainted if a module is loaded that is unsigned or has a signature for which we don't have the key. (Useful feedback and tweaks by David Howells ) Signed-off-by: Rusty Russell Signed-off-by: David Howells Signed-off-by: Rusty Russell --- init/Kconfig | 14 ++++++++++++++ 1 file changed, 14 insertions(+) (limited to 'init') diff --git a/init/Kconfig b/init/Kconfig index 66cc885abbc6..fa8ccad1ea43 100644 --- a/init/Kconfig +++ b/init/Kconfig @@ -1585,6 +1585,20 @@ 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 + help + Check modules for valid signatures upon load: the signature + is simply appended to the module. For more information see + Documentation/module-signing.txt. + +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. endif # MODULES config INIT_ALL_POSSIBLE -- cgit v1.2.3