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-   -   inode confusion? (http://www.linux-archive.org/fedora-selinux-support/697491-inode-confusion.html)

Vadym Chepkov 08-25-2012 12:09 AM

inode confusion?
 
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Hi,

After recent policy upgrade (selinux-policy-targeted-3.10.0-145.fc17.noarch)
I noticed some cron jobs are failing and generate selinux avc:

time->Fri Aug 24 04:02:05 2012
type=SYSCALL msg=audit(1345780925.499:656): arch=c000003e syscall=2 success=no exit=-13 a0=404a07 a1=0 a2=0 a3=0 items=0 ppid=21070 pid=21091 auid=0 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=(none) ses=85 comm="tmpwatch" exe="/usr/sbin/tmpwatch" subj=system_u:system_r:tmpreaper_t:s0-s0:c0.c1023 key=(null)
type=AVC msg=audit(1345780925.499:656): avc: denied { read } for pid=21091 comm="tmpwatch" name="root" dev="dm-1" ino=8194 scontext=system_u:system_r:tmpreaper_t:s0-s0:c0.c1023 tcontext=system_u:object_r:admin_home_t:s0 tclass=dir


tmpwatch definitely shouldn't be going to /root home, and I am pretty sure it doesn't.

What's interesting though is this fact:

[root@fedora ~]# ls -ldi /root
8194 dr-xr-x---. 5 root root 4096 Aug 18 15:18 /root

[root@fedora ~]# ls -ldi /var/tmp
8194 drwxrwxrwt. 3 root root 4096 Aug 24 23:41 /var/tmp

both directories have the same inode number, which selinux is complaining about. Since they are on different files system, it's normal:

[root@fedora ~]# df -h
Filesystem Size Used Avail Use% Mounted on
rootfs 4.0G 1.1G 2.7G 30% /
devtmpfs 223M 0 223M 0% /dev
tmpfs 244M 0 244M 0% /dev/shm
tmpfs 244M 380K 244M 1% /run
/dev/mapper/vgx-root 4.0G 1.1G 2.7G 30% /
tmpfs 244M 0 244M 0% /sys/fs/cgroup
tmpfs 244M 0 244M 0% /media
/dev/mapper/vgx-home 1008M 34M 923M 4% /home
/dev/mapper/vgx-tmp 504M 17M 462M 4% /tmp
/dev/mapper/vgx-var 1008M 303M 655M 32% /var
/dev/xvda1 504M 94M 386M 20% /boot

But it makes me wonder, if SELinux is confused somehow?

Regards,
Vadym




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Dominick Grift 08-26-2012 10:15 AM

inode confusion?
 
On Fri, 2012-08-24 at 20:09 -0400, Vadym Chepkov wrote:
>
> time->Fri Aug 24 04:02:05 2012
> type=SYSCALL msg=audit(1345780925.499:656): arch=c000003e syscall=2 success=no exit=-13 a0=404a07 a1=0 a2=0 a3=0 items=0 ppid=21070 pid=21091 auid=0 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=(none) ses=85 comm="tmpwatch" exe="/usr/sbin/tmpwatch" subj=system_u:system_r:tmpreaper_t:s0-s0:c0.c1023 key=(null)
> type=AVC msg=audit(1345780925.499:656): avc: denied { read } for pid=21091 comm="tmpwatch" name="root" dev="dm-1" ino=8194 scontext=system_u:system_r:tmpreaper_t:s0-s0:c0.c1023 tcontext=system_u:object_r:admin_home_t:s0 tclass=dir
>

> But it makes me wonder, if SELinux is confused somehow?

No it is clear that tmpwatch wants to list /root for whatever reason.

comm="tmpwatch"
name="root"
dev="dm-1"

> Regards,
> Vadym
>
>
>
>
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Vadym Chepkov 08-26-2012 12:30 PM

inode confusion?
 
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On Aug 26, 2012, at 6:15 AM, Dominick Grift wrote:

> On Fri, 2012-08-24 at 20:09 -0400, Vadym Chepkov wrote:
>>
>> time->Fri Aug 24 04:02:05 2012
>> type=SYSCALL msg=audit(1345780925.499:656): arch=c000003e syscall=2 success=no exit=-13 a0=404a07 a1=0 a2=0 a3=0 items=0 ppid=21070 pid=21091 auid=0 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=(none) ses=85 comm="tmpwatch" exe="/usr/sbin/tmpwatch" subj=system_u:system_r:tmpreaper_t:s0-s0:c0.c1023 key=(null)
>> type=AVC msg=audit(1345780925.499:656): avc: denied { read } for pid=21091 comm="tmpwatch" name="root" dev="dm-1" ino=8194 scontext=system_u:system_r:tmpreaper_t:s0-s0:c0.c1023 tcontext=system_u:object_r:admin_home_t:s0 tclass=dir
>>
>
>> But it makes me wonder, if SELinux is confused somehow?
>
> No it is clear that tmpwatch wants to list /root for whatever reason.
>
> comm="tmpwatch"
> name="root"
> dev="dm-1"


Just a coincidence then.
Could it be that root's cron jobs are executed with /root as a current directory and this breaks tmpwatch ?

Vadym

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yersinia 08-26-2012 12:40 PM

inode confusion?
 
On Sat, Aug 25, 2012 at 2:09 AM, Vadym Chepkov <vchepkov@gmail.com> wrote:

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Hash: SHA1



Hi,



After recent policy upgrade (selinux-policy-targeted-3.10.0-145.fc17.noarch)

I noticed some cron jobs are failing and generate selinux avc:



time->Fri Aug 24 04:02:05 2012

type=SYSCALL msg=audit(1345780925.499:656): arch=c000003e syscall=2 success=no exit=-13 a0=404a07 a1=0 a2=0 a3=0 items=0 ppid=21070 pid=21091 auid=0 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=(none) ses=85 comm="tmpwatch" exe="/usr/sbin/tmpwatch" subj=system_u:system_r:tmpreaper_t:s0-s0:c0.c1023 key=(null)


type=AVC msg=audit(1345780925.499:656): avc: *denied *{ read } for *pid=21091 comm="tmpwatch" name="root" dev="dm-1" ino=8194 scontext=system_u:system_r:tmpreaper_t:s0-s0:c0.c1023 tcontext=system_u:object_r:admin_home_t:s0 tclass=dir






tmpwatch definitely shouldn't be going to /root home, and I am pretty sure it doesn't.


No, isn't true. For example try to see which is the device that dm-0 point
sudo lvdisplay|awk '/LV Name/{n=$3} /Block device/{d=$3; sub(".*:","dm-",d); print d,n;}'



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Dominick Grift 08-26-2012 01:14 PM

inode confusion?
 
On Sun, 2012-08-26 at 08:30 -0400, Vadym Chepkov wrote:

> Just a coincidence then.
> Could it be that root's cron jobs are executed with /root as a current directory and this breaks tmpwatch ?

Could be yes, Although i would not expect a read but rather a search
on /root
> Vadym


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