[SRU][Focal, hwe-5.8][PATCH 0/2] CVE-2019-19449

[Luke Nowakowski-Krijger]

Yes it is affected as well. I forgot to send it out when I sent the other
ones.
The bionic one is under "[SRU][B][PATCH 0/2] CVE-2019-19449"

Thanks!
- Luke

On Thu, Sep 30, 2021 at 3:42 AM Thadeu Lima de Souza Cascardo <
cascardo at canonical.com> wrote:

> On Wed, Sep 29, 2021 at 04:57:38PM -0700, Luke Nowakowski-Krijger wrote:
> > [Impact]
> > Mounting a crafted f2fs file system with a segment count in a section
> > that is less than segs_per_sec causes out-of-boundary memory access
> > during fs initalization.
> >
> > [Test case]
> > Reproduced bug with syzbot reproducer
> > (https://syzkaller.appspot.com/x/repro.c?x=102fbac5900000)
> > with slight modification to target a valid loop device.
> > Confirmed that after the patches were applied the fs reports that there
> > are malformed segments/sections and mounting the file system fails,
> > which stops the initialization from continuing and preventing the
> > out-of-boundary memory access.
> >
> > [Potential regression]
> > The patches add checks that are a superset of the previous checks, which
> > might cause some filesystems that succeeded in mounting to now fail.
> >
> > Chao Yu (1):
> >   f2fs: fix to do sanity check on segment/section count
> >
> > Wang Xiaojun (1):
> >   f2fs: fix wrong total_sections check and fsmeta check
> >
> >  fs/f2fs/segment.h |  1 +
> >  fs/f2fs/super.c   | 14 ++++++++++----
> >  2 files changed, 11 insertions(+), 4 deletions(-)
> >
> > --
> > 2.30.2
>
> Hey, Luke.
>
> Have you tested the bionic kernel? Is it affected as well? Or rather, any
> reason you haven't submitted this for 4.15 kernels?
>
> Thanks a lot for the work.
> Cascardo.
>
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