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| author | Ben Hutchings <ben@decadent.org.uk> | 2016-04-28 09:24:05 +0930 |
|---|---|---|
| committer | Sasha Levin <alexander.levin@verizon.com> | 2016-08-19 23:07:58 -0400 |
| commit | e9071d07878c865449c5afb062e6d305c62d1e85 (patch) | |
| tree | a256afd4b574365e9af1061f277fc4ee76ff7757 /Documentation | |
| parent | 6ac9857245bfb71d836f46db817b0c11e3e4bf69 (diff) | |
Documentation/module-signing.txt: Note need for version info if reusing a key
[ Upstream commit b8612e517c3c9809e1200b72c474dbfd969e5a83 ]
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>
Cc: stable@vger.kernel.org
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/module-signing.txt | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/Documentation/module-signing.txt b/Documentation/module-signing.txt index c72702ec1ded..aacf1ce73b8a 100644 --- a/Documentation/module-signing.txt +++ b/Documentation/module-signing.txt @@ -239,3 +239,9 @@ 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. |