linux-kernel - [PATCH v3 0/3][RESEND] modsign enhancement

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Date:   Sat, 24 Mar 2018 10:59:46 +0800
From:   Jia Zhang <zhang.jia@...ux.alibaba.com>
To:     jeyu@...nel.org
Cc:     linux-kernel@...r.kernel.org, zhang.jia@...ux.alibaba.com
Subject: [PATCH v3 0/3][RESEND] modsign enhancement

This patch series allows to disable module validity enforcement
in runtime through the control switch located in securityfs.

In order to keep /sys/module/module/parameters/sig_enforce simple,
the disablement switch is located at
/sys/kernel/security/modsign/disable_enforce.

Assuming CONFIG_MODULE_SIG_FORCE=n, here are the instructions to
test this control switch.

# cat /sys/module/module/parameters/sig_enforce
N
# echo 1 > /sys/module/module/parameters/sig_enforce
# cat /sys/module/module/parameters/sig_enforce
Y
# echo -n 0 > no_sig_enforce
# openssl smime -sign -nocerts -noattr -binary -in no_sig_enforce \
    -inkey <system_trusted_key> -signer <cert> -outform der \
    -out /sys/kernel/security/modsign/disable_enforce
# cat /sys/module/module/parameters/sig_enforce
N

Changelog:
v3:
- The control switch now doesn't support showing the status of sig_enforce.

v2:
- Support to disable validity enforcement in runtime.