fedora-selinux September 2007 archive
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fedora-selinux: Write denied, but no write attempted!?!

Write denied, but no write attempted!?!

From: Göran Uddeborg <goeran_at_nospam>
Date: Sun Sep 16 2007 - 20:42:13 GMT
To: fedora-selinux-list@redhat.com


I'm using xdm rather than gdm. SELinux prevents /sbin/pam_console_apply (pam_console_t) "write" to /var/log/xdm.log
(var_log_t). It happens once every time someone logs in or out. See
the attached mail from SETroubleshoot for an example.

To understand what is going on, I tried to strace the processes. But pam_console_apply doesn't attempt to write anything at all! See the attached (compressed) strace from pid 4480, the process mentioned in the SETroubleshoot mail.

Xdm has stderr pointing to /var/log/xdm.log, so it's not unlikely that the open fd is inherited by pam_console_apply. But if the inheritance itself was disallowed, wouldn't it be a "use" that would be denied by SELinux rather than a "write"?

What am I missing?

(The system is not up-to-date. It is possible this message would go
away with an upgrade. I'm not looking for a way to get rid of the message here, I'm trying to understand what is going on.)

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