firefox, gaim, /lib/ld-2.3.3.so ?
Tom London
selinux at gmail.com
Sat Sep 25 05:25:12 UTC 2004
This is curious....
I've straced gaim both under strict/enforcing and strict/permissive.
It appears that under strict/enforcing, a call to
'mprotect(..., ..., PROT_READ|PROT_WRITE)' fails,
and gaim segv faults. This same call succeeds under strict/permissive,
and gaim then starts successfully.
This also seems to be where the AVC to /lib/ld-2.3.3.so is produced.
Here is the bugzilla:
https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=133505
tom
On Fri, 24 Sep 2004 08:21:22 -0700, Tom London <selinux at gmail.com> wrote:
> Still get /lib/ld-2.3.3.so avc with latest rawhide gtk2 download.
>
> I'm not sure its the right place, but I'll bugzilla this agains glibc.
>
> tom
>
>
>
> On Fri, 24 Sep 2004 07:26:14 -0700, Tom London <selinux at gmail.com> wrote:
> > When in strict/enforcing, mozilla fails to start because or the
> > /lib/ld-2.3.3.so 'violation'.
> >
> > I get the .fonts.cache avc when running in permissive mode. I haven't
> > modified the policy to allow the /lib/ld-2.3.3.so access to see the
> > effect of this failing.
> >
> > Regarding the /lib/ld-2.3.3.so avc, I'm noticing this when I try to
> > start firefox, thunderbird and gaim, but nothing else.. Could it also
> > be a gtk2 problem?
> >
> > tom
> >
> >
> >
> > On Fri, 24 Sep 2004 00:18:05 -0400, Colin Walters <walters at redhat.com> wrote:
> > > On Thu, 2004-09-23 at 20:33 -0700, Tom London wrote:
> > > > After being on the road for a bit, I did a 'yum update' to grab the new stuff.
> > > >
> > > > After doing so (>300 packages), running strict/enforcing,
> > > > firefox and gaim fail to start:
> > > >
> > > > Sep 23 20:10:29 fedora kernel: audit(1095995429.976:0): avc: denied
> > > > { write } for pid=4755 path=/lib/ld-2.3.3.so dev=hda2 ino=3178536
> > > > scontext=user_u:user_r:user_mozilla_t
> > > > tcontext=system_u:object_r:ld_so_t tclass=file
> > >
> > > That is bizarre. My guess is some recent glibc change.
> > >
> > > > Sep 23 20:10:31 fedora kernel: audit(1095995431.164:0): avc: denied
> > > > { unlink } for pid=4755 exe=/usr/lib/firefox-0.10.0/firefox-bin
> > > > name=.fonts.cache-1 dev=hda2 ino=2752979
> > > > scontext=user_u:user_r:user_mozilla_t
> > > > tcontext=user_u:object_r:user_home_t tclass=file
> > >
> > > The fontconfig cache as it's currently implemented is going to be a
> > > perennial problem for SELinux. Any application that uses fontconfig
> > > will want to read and write to the cache file.
> > >
> > > Currently the fontconfig library has a bit of code:
> > > FcBool
> > > FcGlobalCacheSave (FcGlobalCache *cache,
> > > const FcChar8 *cache_file)
> > > {
> > > /* ... */
> > > #if defined (HAVE_GETUID) && defined (HAVE_GETEUID)
> > > /* Set-UID programs can't safely update the cache */
> > > if (getuid () != geteuid ())
> > > return FcFalse;
> > > #endif
> > >
> > > But there's really no equivalent to that check for SELinux.
> > >
> > > A short term solution might be to give .fonts.cache-1 its own type by
> > > patching fontconfig to put it in a ~/.fontconfig directory which has a
> > > type user_font_cache_t that we can statically assign, and
> > > when .fonts.cache-1 is created in that directory it should inherit the
> > > type, so it won't just be user_home_t. Then for every user domain
> > > except user_t we just dontaudit writes to it.
> > >
> > > Was mozilla actually not starting because of this? That would probably
> > > be a bug in the fontconfig libraries.
> > >
> > > A longer term solution would be to make the fontconfig cache a daemon
> > > that controls access to fonts more precisely.
> > >
> > >
> > >
> > > --
> > > fedora-selinux-list mailing list
> > > fedora-selinux-list at redhat.com
> > > http://www.redhat.com/mailman/listinfo/fedora-selinux-list
> > >
> > >
> > >
> > >
> >
> > --
> > Tom London
> >
>
>
> --
> Tom London
>
--
Tom London
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