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Documentation/module-signing.txt: Note need for version info if reusing a key

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commit b8612e517c 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@decadent.org.uk>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Ben Hutchings
2016-04-28 09:24:05 +09:30
committed by popcornmix
parent 4f837de215
commit b464c46175
1 changed files with 6 additions and 0 deletions
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Documentation/module-signing.txt
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@@ -271,3 +271,9 @@ Since the private key is used to sign modules, viruses and malware could use
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.