Messages in this thread | | | Date | Wed, 16 Jan 2013 16:53:41 -0500 | From | Vivek Goyal <> | Subject | Re: [PATCH 2/3] binfmt_elf: Verify signature of signed elf binary |
| |
On Wed, Jan 16, 2013 at 02:24:50PM -0500, Mimi Zohar wrote: [..] > > > Sorry, this is out of scope for IMA. Dmitry has looked into this, but > > > I'm not sure where it stands at the moment. > > > > Ok, so that's one reason that why I wrote these patcehs. IMA currently > > is not doing following things to make sure address space of signed images > > is not modified by others. > > > > - Protecting against modifications to pages on swap. > > - Protecting against modifications by ptrace. > > - Protecting against modifications which bypassed filesystem and directly > > wrote to the block. > > > > Locking down all the pages of signed binaries in memory hopefully should > > solve above problems. > > Signing and verifying ELF executables goes back a long time ~2003/4, > from a number of esteemed kernel developers, including Greg-KH and Serge > Hallyn. > > IMA-appraisal isn't limited to appraising a single type of file, but is > a generic mechanism for appraising all files. If there are issues that > aren't being addressed, then by all means, please help by addressing > them. Duplicating a large portion of the code is not productive.
So do you have ideas on how to address above mentioned issues. Do they fit into the realm of IMA/EVM or I just need to write separate code (which I have already done).
With above issues, IMA stuff for executable files sounds incomplete.
Thanks Vivek
| |