Fedora buildsys and SELinux
Eric Paris
eparis at redhat.com
Fri May 9 19:33:10 UTC 2008
On Fri, 2008-05-02 at 13:20 -0400, Stephen Smalley wrote:
> One question that has come up is whether the patch to support setting
> unknown file labels is sufficient to support the buildsys needs, or
> whether something more is required. My impression is that all we truly
> need is:
> 1) support for setting unknown file labels for use by rpm, and
> 2) bind mount /dev/null over selinux/load within the chroot so that
> policy loads within the chroot do nothing rather than changing the build
> host's policy, and
> 3) bind mount a regular empty file over selinux/context within the
> chroot so that attempts to validate/canonicalize contexts by rpm will
> always return the original value w/o trying to validate against the
> build host's policy.
So I ran livecd-creator today with a couple of things inside the
chroot /selinux
load -> /dev/null
null -> /dev/null
context = [blank file]
mls = 1
enforcing = 1
policyvers = 22
This was attempting to build a F9 livecd on an F9 box, so I wasn't
worried about the labeling issues (although the kernel in question is
patched to support unknown labels)
Things blew up spectacularly :)
warning: libgcc-4.3.0-8: Header V3 DSA signature: NOKEY, key ID 4f2a6fd2
Installing: libgcc ##################### [ 1/129]
error: %post(libgcc-4.3.0-8.x86_64) scriptlet failed, exit status 255
Installing: setup ##################### [ 2/129]
error: unpacking of archive failed on file /etc/bashrc: cpio: lsetfilecon
Installing: filesystem ##################### [ 3/129]
error: unpacking of archive failed on file /: cpio: lsetfilecon
Installing: basesystem ##################### [ 4/129]
Installing: ncurses-base ##################### [ 5/129]
error: unpacking of archive failed on file /etc/terminfo: cpio: lsetfilecon
So I took a look at what's in "context" and I see
"t:s00s0s0s0s0s0s0s0s0s0:s0" which just seems horrible... I assume this
is a libselinux function using this. I wonder if I change that to use
O_TRUNC if things would go a bit more smoothly....
-Eric
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