*** This bug is a duplicate of bug 1959384 ***
https://bugs.launchpad.net/bugs/1959384
** This bug has been marked a duplicate of bug 1959384
CONFIG_IO_STRICT_DEVMEM could be enabled
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https://bugs.launchpad.net/bugs/1855338
Title:
CONFIG_IO_STRICT_DEVMEM should be enabled
Status in linux package in Ubuntu:
Fix Released
Bug description:
We should enable CONFIG_IO_STRICT_DEVMEM to restrict userspace access
of active io-memory ranges.
This could impact kernel debugability. In that case, you may reboot with
iomem=relaxed on the kernel commandline to override this setting.
This config option is recommended by the Kernel Self Protection Project[1]
and a 2019 study performed by Capsule 8 shows that it is enabled in many other
major distro kernels[2].
[1]
https://kernsec.org/wiki/index.php/Kernel_Self_Protection_Project/Recommended_Settings
[2]
https://capsule8.com/blog/millions-of-binaries-later-a-look-into-linux-hardening-in-the-wild/
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