Greetings,
the odd behavior might be caused by the SELinux policy. See below.
On Friday 30 March 2007 15:07:09 Kern Sibbald wrote:
> On Friday 30 March 2007 13:44, Christian Nolte wrote:
> > Kern Sibbald schrieb:
> > > Thanks for the patch.
> > >
> > > On Friday 30 March 2007 11:06, Christian Nolte wrote:
> > >> Christian Nolte schrieb:
> > >>> Creating a rescue disk on a system using Fedora Core 6 and lvm2 I
> > >>> noticed that getdiskinfo does not create the diskinfo/lvm-*.bsi. They
> > >>> are always empty. The problem is that the redirection of the output
> > >>> of lvm does not work. See the attached patch for the necessary
> > >>> changes.
> > >>
> > >> The patch was flawed, sorry. Here is a working one (hopefully), at
> > >> least it works for me.
> > >
> > > Hmmm. It seems to me that even the second one is not really ideal
> > > though
>
> it should work OK. Could
>
> > > you try the following, which I think is better -- providing it works?
> >
> > This solution would indeed be better but it does not work. This is
> > really odd. It seems that lvm neither uses stdout nor stderr which could
> > be redirected. I wonder why cat does the trick though.
>
> Hmmm. That doesn't make much sense, but I'm not going to argue. I'll apply
> the patch you sent. Thanks.
>
> Kern
I tried the following:
lvm vgs -o vg_name,vg_extent_size --units=k | cat > /tmp/vgs2
lvm vgs -o vg_name,vg_extent_size --units=k > /tmp/vgs1
and obtained
-rw-r--r-- 1 root root 0 Apr 15 11:49 /tmp/vgs1
-rw-r--r-- 1 root root 28 Apr 15 11:49 /tmp/vgs2
but as you can see in the attached /var/log/audit.d/audit.log fragment,
writing from an executable running in the lvm_t context to an object labeled
with the tmp_t context is not allowed by the targeted policy.
I tried the above on Fedora, so I'm going to bring the matter up on the Fedora
SELinx list shortly.
Thank you for your consideration,
Davide Bolcioni
--
There is no place like /home.
type=USER_ACCT msg=audit(1171320301.650:41): user pid=6201 uid=0
auid=4294967295 subj=system_u:system_r:crond_t:s0-s0:c0.c1023 msg='PAM:
accounting acct=news : exe="/usr/sbin/crond" (hostname=?, addr=?, terminal=cron
res=success)'
type=LOGIN msg=audit(1171320301.651:42): login pid=6201 uid=0 old
auid=4294967295 new auid=9
type=USER_START msg=audit(1171320301.656:43): user pid=6201 uid=0 auid=9
subj=system_u:system_r:crond_t:s0-s0:c0.c1023 msg='PAM: session open acct=news
: exe="/usr/sbin/crond" (hostname=?, addr=?, terminal=cron res=success)'
type=CRED_ACQ msg=audit(1171320301.656:44): user pid=6201 uid=0 auid=9
subj=system_u:system_r:crond_t:s0-s0:c0.c1023 msg='PAM: setcred acct=news :
exe="/usr/sbin/crond" (hostname=?, addr=?, terminal=cron res=success)'
type=AVC msg=audit(1176630582.797:103): avc: denied { write } for pid=6201
comm="lvm" name="vgs1" dev=tmpfs ino=33551 scontext=user_u:system_r:lvm_t:s0
tcontext=user_u:object_r:tmp_t:s0 tclass=file
type=SYSCALL msg=audit(1176630582.797:103): arch=c000003e syscall=59
success=yes exit=0 a0=8eaa80 a1=8d61b0 a2=8f4300 a3=6d items=0 ppid=5575
pid=6201 auid=503 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0
tty=pts1 comm="lvm" exe="/sbin/lvm.static" subj=user_u:system_r:lvm_t:s0
key=(null)
type=AVC msg=audit(1176630585.345:104): avc: denied { write } for pid=6201
comm="lvm" name=".cache" dev=dm-1 ino=1933743 scontext=user_u:system_r:lvm_t:s0
tcontext=user_u:object_r:lvm_etc_t:s0 tclass=file
type=SYSCALL msg=audit(1176630585.345:104): arch=c000003e syscall=2 success=no
exit=-13 a0=89da10 a1=42 a2=1ff a3=1 items=0 ppid=5575 pid=6201 auid=503 uid=0
gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=pts1 comm="lvm"
exe="/usr/sbin/lvm" subj=user_u:system_r:lvm_t:s0 key=(null)
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