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Message #44034
[Bug 1259570] Re: kexec should get a disabling sysctl
** Changed in: linux (Ubuntu Precise)
Assignee: Tyler Hicks (tyhicks) => (unassigned)
** Changed in: linux (Ubuntu Precise)
Status: Confirmed => New
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https://bugs.launchpad.net/bugs/1259570
Title:
kexec should get a disabling sysctl
Status in “linux” package in Ubuntu:
Fix Committed
Status in “linux” source package in Precise:
New
Status in “linux” source package in Quantal:
New
Status in “linux” source package in Raring:
New
Status in “linux” source package in Saucy:
New
Status in “linux” source package in Trusty:
Fix Committed
Bug description:
To enable kexec makes sense for a generic distro kernel. But if your
users have root in their virtual machines, and you want to make it
hard for them to run code in ring 0, you commonly disable further
module loading and you also want to disable kexec[1]. Kees Cook wrote
up a patch[2] that we'd like to see applied to the Ubuntu kernel to
avoid recompilation of the distro kernel.
I'm marking this as a security issue on the ground that it's quite
surprising that setting kernel.modules_disabled=1 as a hardening
feature can be subverted by using kexec.
[1] http://mjg59.dreamwidth.org/28746.html
[2] https://lkml.org/lkml/2013/12/9/765
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References