Re: [RFC PATCH v6.6 00/10] Address CVE-2024-46701

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On Wed, Jan 29, 2025 at 11:37:51AM -0500, Chuck Lever wrote:
> On 1/29/25 10:21 AM, Greg Kroah-Hartman wrote:
> > On Wed, Jan 29, 2025 at 10:06:49AM -0500, Chuck Lever wrote:
> > > On 1/29/25 9:50 AM, Greg Kroah-Hartman wrote:
> > > > On Wed, Jan 29, 2025 at 08:55:15AM -0500, Chuck Lever wrote:
> > > > > On 1/24/25 2:19 PM, cel@xxxxxxxxxx wrote:
> > > > > > From: Chuck Lever <chuck.lever@xxxxxxxxxx>
> > > > > > 
> > > > > > This series backports several upstream fixes to origin/linux-6.6.y
> > > > > > in order to address CVE-2024-46701:
> > > > > > 
> > > > > >      https://nvd.nist.gov/vuln/detail/CVE-2024-46701
> > > > > > 
> > > > > > As applied to origin/linux-6.6.y, this series passes fstests and the
> > > > > > git regression suite.
> > > > > > 
> > > > > > Before officially requesting that stable@ merge this series, I'd
> > > > > > like to provide an opportunity for community review of the backport
> > > > > > patches.
> > > > > > 
> > > > > > You can also find them them in the "nfsd-6.6.y" branch in
> > > > > > 
> > > > > >      https://git.kernel.org/pub/scm/linux/kernel/git/cel/linux.git
> > > > > > 
> > > > > > Chuck Lever (10):
> > > > > >      libfs: Re-arrange locking in offset_iterate_dir()
> > > > > >      libfs: Define a minimum directory offset
> > > > > >      libfs: Add simple_offset_empty()
> > > > > >      libfs: Fix simple_offset_rename_exchange()
> > > > > >      libfs: Add simple_offset_rename() API
> > > > > >      shmem: Fix shmem_rename2()
> > > > > >      libfs: Return ENOSPC when the directory offset range is exhausted
> > > > > >      Revert "libfs: Add simple_offset_empty()"
> > > > > >      libfs: Replace simple_offset end-of-directory detection
> > > > > >      libfs: Use d_children list to iterate simple_offset directories
> > > > > > 
> > > > > >     fs/libfs.c         | 177 +++++++++++++++++++++++++++++++++------------
> > > > > >     include/linux/fs.h |   2 +
> > > > > >     mm/shmem.c         |   3 +-
> > > > > >     3 files changed, 134 insertions(+), 48 deletions(-)
> > > > > > 
> > > > > 
> > > > > I've heard no objections or other comments. Greg, Sasha, shall we
> > > > > proceed with merging this patch series into v6.6 ?
> > > > 
> > > > Um, but not all of these are in a released kernel yet, so we can't take
> > > > them all yet.
> > > 
> > > Hi Greg -
> > > 
> > > The new patches are in v6.14 now. I'm asking stable to take these
> > > whenever you are ready. Would that be v6.14-rc1? I can send a reminder
> > > if you like.
> > 
> > Yes, we have to wait until changes are in a -rc release unless there are
> > "real reasons to take it now" :)
> > 
> > > > Also what about 6.12.y and 6.13.y for those commits that
> > > > will be showing up in 6.14-rc1?  We can't have regressions for people
> > > > moving to those releases from 6.6.y, right?
> > > 
> > > The upstream commits have Fixes tags. I assumed that your automation
> > > will find those and apply them to those kernels -- the upstream versions
> > > of these patches I expect will apply cleanly to recent LTS.
> > 
> > "Fixes:" are never guaranteed to show up in stable kernels, they are
> > only a "maybe when we get some spare cycles and get around to it we
> > might do a simple pass to see what works or doesn't."
> > 
> > If you KNOW a change is a bugfix for stable kernels, please mark it as
> > such!  "Fixes:" is NOT how to do that, and never has been.  It's only
> > additional meta-data that helps us out.
> > 
> > So please send us a list of the commits that need to go to 6.12.y and
> > 6.13.y, we have to have that before we could take the 6.6.y changes.
> 
> 903dc9c43a15 ("libfs: Return ENOSPC when the directory offset range is
> exhausted")
> d7bde4f27cee ("Revert "libfs: Add simple_offset_empty()"")
> b662d858131d ("Revert "libfs: fix infinite directory reads for offset dir"")
> 68a3a6500314 ("libfs: Replace simple_offset end-of-directory detection")
> b9b588f22a0c ("libfs: Use d_children list to iterate simple_offset
> directories")

Cool, thanks for the list (and not all were marked with fixes, i.e.
those reverts, I guess we need to start checking for reverts better.  I
have tooling set up for that but not integrated yet...)

I'll just queue them all up now.

greg k-h




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