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SubjectRe: [RFC 2/2] initramfs with digital signature protection
On Tue, Feb 05, 2013 at 06:19:26PM +0000, Matthew Garrett wrote:
> On Tue, Feb 05, 2013 at 02:34:50PM +0200, Dmitry Kasatkin wrote:
> > Digitally signed initramfs can be used to provide protected user-space
> > environment for initialization purpose. For example, LSM, IMA/EVM can be
> > securely initialized using such approach.
> What stops an attacker from simply removing the signed image from the
> initramfs and running modified versions of the same tools from the
> unsigned image?

Looks like having signed initramfs image is mandatory otherwise system

+ if (sys_access(initramfs_img, 0))
+ panic("signed initramfs image not found (INITRAMFS_SIG is

Also I am assuming that from signed initramfs, keys will be loaded in
appropriate keyrings and then keyring will be locked so that any
tools from unsigned initramfs can not load additional keys.


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