libreport version: 2.0.8 executable: /usr/bin/python hashmarkername: setroubleshoot kernel: 3.2.5-3.fc16.x86_64 reason: SELinux is preventing /usr/libexec/polkit-1/polkit-agent-helper-1 from 'read' accesses on the None /var/log/gdm/:2-greeter.log. time: Mon 13 Feb 2012 19:38:07 CET description: :SELinux is preventing /usr/libexec/polkit-1/polkit-agent-helper-1 from 'read' accesses on the None /var/log/gdm/:2-greeter.log. : :***** Plugin catchall (100. confidence) suggests *************************** : :If you believe that polkit-agent-helper-1 should be allowed read access on the :2-greeter.log <Unbekannt> by default. :Then you should report this as a bug. :You can generate a local policy module to allow this access. :Do :allow this access for now by executing: :# grep polkit-agent-he /var/log/audit/audit.log | audit2allow -M mypol :# semodule -i mypol.pp : :Additional Information: :Source Context system_u:system_r:policykit_auth_t:s0-s0:c0.c1023 :Target Context system_u:object_r:xdm_log_t:s0 :Target Objects /var/log/gdm/:2-greeter.log [ None ] :Source polkit-agent-he :Source Path /usr/libexec/polkit-1/polkit-agent-helper-1 :Port <Unbekannt> :Host (removed) :Source RPM Packages polkit-0.102-3.fc16.x86_64 :Target RPM Packages :Policy RPM selinux-policy-3.10.0-75.fc16.noarch :Selinux Enabled True :Policy Type targeted :Enforcing Mode Enforcing :Host Name (removed) :Platform Linux (removed) 3.2.5-3.fc16.x86_64 #1 SMP Thu Feb 9 : 01:24:38 UTC 2012 x86_64 x86_64 :Alert Count 1 :First Seen Mon 13 Feb 2012 14:32:38 CET :Last Seen Mon 13 Feb 2012 14:32:38 CET :Local ID 70d49708-fccb-4155-a807-bbf7aa41313a : :Raw Audit Messages :type=AVC msg=audit(1329139958.735:416): avc: denied { read } for pid=29719 comm="polkit-agent-he" path="/var/log/gdm/:2-greeter.log" dev=dm-1 ino=655774 scontext=system_u:system_r:policykit_auth_t:s0-s0:c0.c1023 tcontext=system_u:object_r:xdm_log_t:s0 tclass=filenode=(removed) type=SYSCALL msg=audit(1329139958.735:416): arch=c000003e syscall=59 success=yes exit=0 a0=34900071b0 a1=7fffdb9006d0 a2=21a4b00 a3=7fffdb9001e0 items=0 ppid=19843 pid=29719 auid=42 uid=42 gid=42 euid=0 suid=0 fsuid=0 egid=42 sgid=42 fsgid=42 tty=(none) ses=15 comm="polkit-agent-he" exe="/usr/libexec/polkit-1/polkit-agent-helper-1" subj=system_u:system_r:policykit_auth_t:s0-s0:c0.c1023 key=(null) : : :Hash: polkit-agent-he,policykit_auth_t,xdm_log_t,None,read : :audit2allow : : :audit2allow -R : :
This is a leak.
not sure why it would be reading :2-greeter.log, but it definitely writes to it...that's where stderr goes.
It is not reading, but you opened it for read and passed that access onto your children which is causing this AVC. We currently allow xserver_xdm_append_log(policykit_auth_t) The proper fix for this would be to not open this file for read.
stdout and stderr are normally opened for both read and write (just look at ls -l /proc/*/fd/[12]) . I have some vague notion of hitting a problem before when opening either STDIN as O_RDONLY or STDOUT/STDERR but that was years ago and I can't find any evidence it even happened looking through git logs for various projects, so I'll make the change.
filename looks related https://bugzilla.redhat.com/show_bug.cgi?id=804450
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