Bugzilla Bug 123703

From blaisorblade's homepage:

16 February 2006: uml_utilities 20060216: I've fixed here all kinds of bugs in
various utilities

    * Finally included the security fix against local DoS - an attacker with
local access could easily bring down an interface by using uml_net, if
installed setuid (as done by default). It was included in distros' packages
from a lot of time, however.
    * Fixed the misbehaviour of COW utilities (especially uml_moo) compiled on
64-bit platform:
         1. when manipulating COW files generated by 32-bit UML binaries, it
crashed immediately without action with floating point exception
(moo-64-bit-padding-fix);
         2. after fixing that, it gave wrong results (and this probably
affected also 64-bit COW files.
    * Some fixes to honeypot.pl.
    * Various code fixlets
    * Better compilation system - by 'make CFLAGS="-O2 -Wall"' you get an
optimized build (it was more awkward before).

As a side-note, the current version of usermode-utilities (20040406-r1) is
marked stable on amd64. This is a pity, since that version has a pretty decent
chance of producing corrupt uml/cow filesystems, something which will probably
not be seen by the user until it is too late.

Created an attachment (id=88872) [edit]
usermode-utilities-20060323.ebuild

I'm just getting a UML setup going, so while this builds I can't yet test if it
actually works.

Created an attachment (id=88873) [edit]
files/20060323-ldflags.patch

Fixes the QA Notice.

QA Notice: the following files are setXid, dyn linked, and using lazy bindings
 This combination is generally discouraged.  Try re-emerging the package:
 LDFLAGS='-Wl,-z,now' emerge usermode-utilities
LAZY usr/bin/uml_net

This should really get into portage soon because version 20040406-r1 can't
handle large files properly. Using an 8 GB backing file and a corresponding cow
file resulted in

COW file open: File too large

when using uml_moo to merge both:

uml_moo -b gentoo_root_fs_unstable1 gentoo_unstable_cow gentoo_root_fs_unstable

20060216 just does the job using the exact same syntax. The new backing file
has the right size and works as expected. 

I haven't tried the ebuild here but compiled 20060216 manually and so far
everything works nicely.

@dang: would like to have a look by chance?

20060323 added.