[DSE-Dev] Bug#707246: selinux-policy-default: dmesg produce AVC when trying to access to /etc/locale.alias
Michael Scherer
misc at zarb.org
Wed May 8 14:16:57 UTC 2013
Package: selinux-policy-default
Version: 2:2.20110726-12
Severity: normal
Hi,
Having decided to give a test at SElinux, I have installed a debian 6.0 and later
upgraded to 7.0. As recommended on the wiki, I first did a boot with selinux in
permissive mode to see if there is potential errors, and found several AVC.
On boot, it seems something is running dmesg in a confined domain :
[ 11.562532] type=1400 audit(1367756552.570:6): avc: denied { read } for pid=626 comm="dmesg" name="locale.alias" dev=sda1 ino=394340 scontext=system_u:system_r:dmesg_t:s0 tcontext=system_u:object_r:etc_t:s0 tclass=file
[ 11.562557] type=1400 audit(1367756552.570:7): avc: denied { open } for pid=626 comm="dmesg" name="locale.alias" dev=sda1 ino=394340 scontext=system_u:system_r:dmesg_t:s0 tcontext=system_u:object_r:etc_t:s0 tclass=file
[ 11.562617] type=1400 audit(1367756552.570:8): avc: denied { getattr } for pid=626 comm="dmesg" path="/etc/locale.alias" dev=sda1 ino=394340 scontext=system_u:system_r:dmesg_t:s0 tcontext=system_u:object_r:etc_t:s0 tclass=file
And domain system_u:system_r:dmesg_t:s0 cannot read /etc/locale.alias, as that file is not labeled to something special.
I assume that it should be labeled locale_t, since dmesg has access to that domain :
# sesearch -s dmesg_t -A -c file -t locale_t
Found 1 semantic av rules:
allow dmesg_t locale_t : file { ioctl read getattr lock open } ;
There is however no side effect to the AVC, except noise.
-- System Information:
Debian Release: 7.0
APT prefers stable
APT policy: (500, 'stable')
Architecture: amd64 (x86_64)
Kernel: Linux 3.2.0-4-amd64 (SMP w/1 CPU core)
Locale: LANG=fr_FR.UTF-8, LC_CTYPE=fr_FR.UTF-8 (charmap=ANSI_X3.4-1968) (ignored: LC_ALL set to C)
Shell: /bin/sh linked to /bin/dash
Versions of packages selinux-policy-default depends on:
ii libpam-modules 1.1.3-7.1
ii libselinux1 2.1.9-5
ii libsepol1 2.1.4-3
ii policycoreutils 2.1.10-9
ii python 2.7.3-4
Versions of packages selinux-policy-default recommends:
ii checkpolicy 2.1.8-2
ii setools 3.3.7-3
Versions of packages selinux-policy-default suggests:
pn logcheck <none>
pn syslog-summary <none>
-- Configuration Files:
/etc/selinux/default/modules/active/file_contexts.local [Errno 13] Permission denied: u'/etc/selinux/default/modules/active/file_contexts.local'
-- no debconf information
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