[CentOS] Is ext4 safe for a production server?

James Hogarth james.hogarth at gmail.com
Fri Dec 11 09:36:23 UTC 2009


On that today perhaps those thinking of ext4 for production systems -
especially shared multiuser systems - should check out CVE-2009-4131 ...

CVE-2009-4131: Arbitrary file overwrite in ext4

Insufficient permission checking in the ext4 filesytem could be
exploited by local users to overwrite arbitrary files.

Ksplice update ID: mfm62pmh

2009/12/11 Ross Walker <rswwalker at gmail.com>

> On Dec 10, 2009, at 7:52 PM, Mark Caudill <markca at codelulz.com> wrote:
>
> > Christopher Chan wrote:
> >> Morten Torstensen wrote:
> >>> On 08.12.2009 13:34, Chan Chung Hang Christopher wrote:
> >>>>> Speaking for me (on Linux systems) on top of LVM on top of md.
> >>>>> On IRIX
> >>>>> as it was intended.
> >>>>>
> >>>> That is a disaster combination for XFS even now. You mentioned some
> >>>> pretty hefty hardware in your other post...
> >>> If XFS doesn't play well with LVM, how can it even be an option? I
> >>> couldn't live without LVM...
> >>>
> >>
> >> I meant it in the sense of data guarantee. XFS has a major history of
> >> losing data unless used with hardware raid cards that have a bbu
> >> cache.
> >> That changed when XFS got barrier support.
> >>
> >> However, anything on LVM be it ext3, ext4 or XFS that has barrier
> >> support will not be able to use barriers because device-mapper does
> >> not
> >> support barriers and therefore, if you use LVM, it better be on a
> >> hardware raid array where the card has bbu cache.
> >
> > Wait, just to be clear, are you saying that all use of LVM is a bad
> > idea
> > unless on hardware RAID? That's bad it if it's true since it seems
> > to me
> > that most modern distros like to use LVM by default. Am I missing
> > something?
>
> If you use a leading edge distro then they will most likely be using a
> LVM version with barrier support as it was implemented as of
> 2.6.29-2.6.30+.
>
> It should be backported by the next release of CentOS hopefully.
>
> -Ross
>
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