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Bug 170587 - pam_selinux.so will misreport errors on relabelling terminal devices
pam_selinux.so will misreport errors on relabelling terminal devices
Product: Red Hat Enterprise Linux 4
Classification: Red Hat
Component: pam (Show other bugs)
All Linux
medium Severity medium
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Assigned To: Tomas Mraz
Jay Turner
Depends On: 153711
Blocks: 168429
  Show dependency treegraph
Reported: 2005-10-13 02:49 EDT by Tomas Mraz
Modified: 2015-01-07 19:10 EST (History)
1 user (show)

See Also:
Fixed In Version: RHBA-2006-0093
Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of:
Last Closed: 2006-03-07 13:49:59 EST
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Regression: ---
Mount Type: ---
Documentation: ---
Verified Versions:
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oVirt Team: ---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: ---

Attachments (Terms of Use)

External Trackers
Tracker ID Priority Status Summary Last Updated
Red Hat Product Errata RHBA-2006:0093 normal SHIPPED_LIVE pam bug fix update 2006-03-06 00:00:00 EST

  None (edit)
Description Tomas Mraz 2005-10-13 02:49:56 EDT
+++ This bug was initially created as a clone of Bug #153711 +++

From Bugzilla Helper:
User-Agent: Mozilla/5.0 (compatible; Konqueror/3.4; Linux) KHTML/3.4.0 (like Gecko)

Description of problem:
The below code from pam-0.78-selinux.patch has a bug.  It should use ptr  
instead of ttybuf when reporting the error so that if the strncmp() returns  
zero the correct data will be used.  This has been noted when su experiences  
+  if(strncmp("/dev/", tty, 5)) {  
+    snprintf(ttybuf,sizeof(ttybuf),"/dev/%s",tty);  
+    ptr = ttybuf;  
+  }  
+  else  
+    ptr = tty;  
+  if (setfilecon(ptr, context))  
+  {  
+      syslog(LOG_NOTICE,  
+             _("Warning!  Could not relabel %s with %s, not relabeling.\n"),  
+             ttybuf,context);  
+  }  
Also note that in the case of a kill -1 on the sshd for a ssh login it's  
normal that the /dev/pts device will be gone before su notices anything has  
happened.  So maybe ENOENT should not even be logged in this case. 
The URL I've given is for the fedora-selinux-list discussion of this issue. 

Version-Release number of selected component (if applicable):

How reproducible:

Steps to Reproduce:
Login via ssh and su to another account.  Then kill -1 the sshd controlling 
the session.  Note that su logs a message such as the following: 
Apr  3 11:58:51 localhost su[3659]: Warning!  Could not relabel ,
\uffff\uff7f\u0661\uffff with user_u:object_r:devpts_t, not relabeling.
Comment 6 Red Hat Bugzilla 2006-03-07 13:49:59 EST
An advisory has been issued which should help the problem
described in this bug report. This report is therefore being
closed with a resolution of ERRATA. For more information
on the solution and/or where to find the updated files,
please follow the link below. You may reopen this bug report
if the solution does not work for you.


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