[GIT PULL] Kernel lockdown for secure boot
mjg59 at google.com
Wed Apr 4 16:22:06 UTC 2018
On Wed, Apr 4, 2018 at 6:52 AM Theodore Y. Ts'o <tytso at mit.edu> wrote:
> On Wed, Apr 04, 2018 at 02:33:37PM +0100, David Howells wrote:
> > Theodore Y. Ts'o <tytso at mit.edu> wrote:
> > > Whoa. Why doesn't lockdown prevent kexec? Put another away, why
> > > isn't this a problem for people who are fearful that Linux could be
> > > used as part of a Windows boot virus in a Secure UEFI context?
> > Lockdown mode restricts kexec to booting an authorised image (where the
> > authorisation may be by signature or by IMA).
> If that's true, then Matthew's assertion that lockdown w/o secure boot
> is insecure goes away, no?
If you don't have secure boot then an attacker with root can modify your
bootloader or kernel, and on next boot lockdown can be silently disabled.
To unsubscribe from this list: send the line "unsubscribe linux-security-module" in
the body of a message to majordomo at vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
More information about the Linux-security-module-archive