Mark Haney wrote:
Paul Howarth wrote:
Mark Haney wrote:
Paul Howarth wrote:
Mark Haney wrote:
I just encountered my first problem with selinux. As I'm just now
losing my selinux virginity, I need help. I have a process that I
can't kill since apparently the SIGKILL permission wasn't granted
to it. How do I go about fixing that?
You need to post the selinux denial message you're getting, so that
we can see what is trying to send a signal to what.
Paul.
Duh. Sorry. I'm trying to do about a million things here. Here it
is:
Nov 8 10:34:26 localhost kernel: audit(1163000066.441:216): avc:
denied { sigkill } for pid=28872 comm="bash"
scontext=user_u:system_r:unconfined_t:s0
tcontext=root:system_r:unconfined_t:s0-s0:c0.c255 tclass=process
What I'm trying to kill is a perl script (rsnapshot).
Well that's a curious one. It would be allowed by policy here. Try
piping that error log entry through /usr/sbin/audit2why at your end.
Paul.
/usr/sbin/audit2why < audit.meh
Nov 8 10:34:26 localhost kernel: audit(1163000066.441:216): avc:
denied { sigkill } for pid=28872 comm="bash"
scontext=user_u:system_r:unconfined_t:s0
tcontext=root:system_r:unconfined_t:s0-s0:c0.c255 tclass=process
Was caused by:
Constraint violation.
Check policy/constraints.
Typically, you just need to add a type attribute to the
domain to satisfy the constraint.
This is what I get when I piped it through audit2why.
This is a problem with MCS. Basically you are running an unconfined
domain at
user_u:system_r:unconfined_t:s0 (s0 is sometimes referred to as SystemLow)
The process you are trying to kill is running with a range.
root:system_r:unconfined_t:s0-s0:c0.c255 (SystemLow-SystemHigh)
In this version of the policy, there is a constraint that says the
domain (scontext) sending the signal needs to "dominate" the target
domain (tcontext).
Since the process does not you get the denial.
Later versions of policy have fixed this problem
You can also change your login to allow you to login in this range.
semanage login -a -r SystemLow-SystemHigh dwalsh
Or if you want all users to have it
semanage login -m -r SystemLow-SystemHigh __default__
