AVC generated from virtual terminal switch ('Ctl-Alt-F1/Ctl-Alt-F7')

[Tom London]

Running Rawhide, targeted enforcing.

Booting into gdm/gnome, entering 'Ctl-Alt-F1' and logging in as the
same user generates the following audit messages:

type=USER_AUTH msg=audit(1199979217.226:28): user pid=2602 uid=0
auid=4294967295 subj=system_u:system_r:local_login_t:s0-s0:c0.c1023
msg='op=PAM:authentication acct=tbl exe="/bin/login" (hostname=?,
addr=?, terminal=tty1 res=failed)'
type=USER_LOGIN msg=audit(1199979217.266:29): user pid=2602 uid=0
auid=4294967295 subj=system_u:system_r:local_login_t:s0-s0:c0.c1023
msg='uid=500: exe="/bin/login" (hostname=?, addr=?, terminal=tty1
res=failed)'
type=USER_AUTH msg=audit(1199979226.383:30): user pid=2602 uid=0
auid=4294967295 subj=system_u:system_r:local_login_t:s0-s0:c0.c1023
msg='op=PAM:authentication acct=tbl exe="/bin/login" (hostname=?,
addr=?, terminal=tty1 res=failed)'
type=USER_LOGIN msg=audit(1199979226.384:31): user pid=2602 uid=0
auid=4294967295 subj=system_u:system_r:local_login_t:s0-s0:c0.c1023
msg='uid=500: exe="/bin/login" (hostname=?, addr=?, terminal=tty1
res=failed)'
type=USER_AUTH msg=audit(1199979234.098:32): user pid=2602 uid=0
auid=4294967295 subj=system_u:system_r:local_login_t:s0-s0:c0.c1023
msg='op=PAM:authentication acct=tbl exe="/bin/login" (hostname=?,
addr=?, terminal=tty1 res=success)'
type=USER_ACCT msg=audit(1199979234.106:33): user pid=2602 uid=0
auid=4294967295 subj=system_u:system_r:local_login_t:s0-s0:c0.c1023
msg='op=PAM:accounting acct=tbl exe="/bin/login" (hostname=?, addr=?,
terminal=tty1 res=success)'
type=LOGIN msg=audit(1199979234.108:34): login pid=2602 uid=0 old
auid=4294967295 new auid=500
type=USER_ROLE_CHANGE msg=audit(1199979234.130:35): user pid=2602
uid=0 auid=500 subj=system_u:system_r:local_login_t:s0-s0:c0.c1023
msg='pam: default-context=unconfined_u:unconfined_r:unconfined_t:s0
selected-context=unconfined_u:unconfined_r:unconfined_t:s0:
exe="/bin/login" (hostname=?, addr=?, terminal=tty1 res=success)'
type=AVC msg=audit(1199979234.132:36): avc:  denied  { link } for
pid=2602 comm="login"
scontext=system_u:system_r:local_login_t:s0-s0:c0.c1023
tcontext=system_u:system_r:xdm_t:s0-s0:c0.c1023 tclass=key
type=SYSCALL msg=audit(1199979234.132:36): arch=40000003 syscall=288
success=no exit=-13 a0=8 a1=fffffffc a2=fffffffd a3=1f4 items=0 ppid=1
pid=2602 auid=500 uid=500 gid=500 euid=0 suid=0 fsuid=0 egid=0 sgid=0
fsgid=0 tty=tty1 comm="login" exe="/bin/login"
subj=system_u:system_r:local_login_t:s0-s0:c0.c1023 key=(null)
type=USER_START msg=audit(1199979234.142:37): user pid=2602 uid=0
auid=500 subj=system_u:system_r:local_login_t:s0-s0:c0.c1023
msg='op=PAM:session_open acct=tbl exe="/bin/login" (hostname=?,
addr=?, terminal=tty1 res=success)'
type=CRED_ACQ msg=audit(1199979234.142:38): user pid=2602 uid=0
auid=500 subj=system_u:system_r:local_login_t:s0-s0:c0.c1023
msg='op=PAM:setcred acct=tbl exe="/bin/login" (hostname=?, addr=?,
terminal=tty1 res=success)'
type=USER_LOGIN msg=audit(1199979234.145:39): user pid=2602 uid=0
auid=500 subj=system_u:system_r:local_login_t:s0-s0:c0.c1023
msg='uid=500: exe="/bin/login" (hostname=?, addr=?, terminal=tty1
res=success)'

Putting system into permissive mode and retrying appears to generate
no new AVCs.

Does

#============= local_login_t ==============
allow local_login_t xdm_t:key link;

make sense?

tom
-- 
Tom London