Red Hat Bugzilla – Bug 218880
LSPP: 'more' doesn't work after a newrole
Last modified: 2007-11-30 17:07:38 EST
Description of problem:
After using 'newrole' to change roles on an MLS system, the 'more'
command no longer works. It gets an EBADF when trying to read the
user's input for paging. The problem is that 'more' reads stderr
but 'newrole' closes stderr and re-opens it as WRONLY.
Should we make 'newrole' less paranoid with respect to stderr or
fix 'more'? 'less' reads stdin and therefore works.
Version-Release number of selected component (if applicable):
RHEL5 Beta 2 with MLS policy and policycoreutils from dwalsh
Steps to Reproduce:
1.install an mls system
3.run 'more' on a file bigger than a screen full (works)
4.run 'newrole' to change roles, or probably anything else
5.run 'more' again on the same file and it will terminate after
the first screen full. An strace shows its an EBADF and I've
verified that the newrole code closes and reopens the fd.
'more' aborts after the first screen full.
'more' should wait for user input and then page through the file according.
Recommend reverting newrole to opening all three descriptors rw, as it used to
do before it was "cleaned up". This seems consistent with how the shell sets up
descriptors for the tty as well.
Should be a trivial patch, please take to selinux list.
Fixed in policycoreutils-1.33.6-4.el5
When this shows up in a repo or a kit I'll give it a try.
Are you also posting a patch to the selinux list?
QE ack for RHEL5.
A package has been built which should help the problem described in
this bug report. This report is therefore being closed with a resolution
of CURRENTRELEASE. You may reopen this bug report if the solution does
not work for you.