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lockdown-updates 2020-06-19 15:21:02 UTC 2020-06-19
UBUNTU: SAUCE: (efi-lockdown) debugfs: Disallow use of debugfs files when the...

Author: David Howells
Author Date: 2017-10-18 16:28:02 UTC

UBUNTU: SAUCE: (efi-lockdown) debugfs: Disallow use of debugfs files when the kernel is locked down

BugLink: https://bugs.launchpad.net/bugs/1884159

Disallow opening of debugfs files when the kernel is locked down as various
drivers give raw access to hardware through debugfs.

Accesses to tracefs should use /sys/kernel/tracing/ rather than
/sys/kernel/debug/tracing/. Possibly a symlink should be emplaced.

Normal device interaction should be done through configfs or a miscdev, not
debugfs.

Note that this makes it unnecessary to specifically lock down show_dsts(),
show_devs() and show_call() in the asus-wmi driver.

Signed-off-by: David Howells <dhowells@redhat.com>
cc: Andy Shevchenko <andy.shevchenko@gmail.com>
cc: acpi4asus-user@lists.sourceforge.net
cc: platform-driver-x86@vger.kernel.org
cc: Matthew Garrett <matthew.garrett@nebula.com>
cc: Thomas Gleixner <tglx@linutronix.de>
(backported from commit 125da2e1c5d0a6aca5faafba336c8e8506a4e000
 git://git.kernel.org/pub/scm/linux/kernel/git/jwboyer/fedora.git)
Signed-off-by: Seth Forshee <seth.forshee@canonical.com>

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