This is a note to let you know that I've just added the patch titled
Documentation/module-signing.txt: Note need for version info if reusing a key
to the 4.7-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
documentation-module-signing.txt-note-need-for-version-info-if-reusing-a-key.patch
and it can be found in the queue-4.7 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From b8612e517c3c9809e1200b72c474dbfd969e5a83 Mon Sep 17 00:00:00 2001
From: Ben Hutchings <ben@xxxxxxxxxxxxxxx>
Date: Thu, 28 Apr 2016 09:24:05 +0930
Subject: Documentation/module-signing.txt: Note need for version info if reusing a key
From: Ben Hutchings <ben@xxxxxxxxxxxxxxx>
commit b8612e517c3c9809e1200b72c474dbfd969e5a83 upstream.
Signing a module should only make it trusted by the specific kernel it
was built for, not anything else. If a module signing key is used for
multiple ABI-incompatible kernels, the modules need to include enough
version information to distinguish them.
Signed-off-by: Ben Hutchings <ben@xxxxxxxxxxxxxxx>
Signed-off-by: Rusty Russell <rusty@xxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
Documentation/module-signing.txt | 6 ++++++
1 file changed, 6 insertions(+)
--- a/Documentation/module-signing.txt
+++ b/Documentation/module-signing.txt
@@ -271,3 +271,9 @@ Since the private key is used to sign mo
the private key to sign modules and compromise the operating system. The
private key must be either destroyed or moved to a secure location and not kept
in the root node of the kernel source tree.
+
+If you use the same private key to sign modules for multiple kernel
+configurations, you must ensure that the module version information is
+sufficient to prevent loading a module into a different kernel. Either
+set CONFIG_MODVERSIONS=y or ensure that each configuration has a different
+kernel release string by changing EXTRAVERSION or CONFIG_LOCALVERSION.
Patches currently in stable-queue which might be from ben@xxxxxxxxxxxxxxx are
queue-4.7/module-invalidate-signatures-on-force-loaded-modules.patch
queue-4.7/documentation-module-signing.txt-note-need-for-version-info-if-reusing-a-key.patch
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