Re: [PATCH stable linux-5.15.y 00/10] Fix bpf mem read/write vulnerability.

Hao Luo
2022-04-29T17:23:07Z

On Fri, Apr 29, 2022 at 2:01 AM Greg KH <gregkh@linuxfoundation.org> wrote:
>
> On Thu, Apr 28, 2022 at 04:57:41PM -0700, Hao Luo wrote:
> > Hi Greg,
> >
> > Please cherry-pick this patch series into 5.15.y stable. It
> > includes a feature that fixes CVE-2022-0500 which allows a user with
> > cap_bpf privileges to get root privileges. The patch that fixes
> > the bug is
> >
> > patch 7/10: bpf: Make per_cpu_ptr return rdonly
> >
> > The rest are the depedences required by the fix patch. Note that v5.10 and
> > below are not affected by this bug.
> >
> > This patchset has been merged in mainline v5.17 and backported to v5.16[1],
> > except patch 10/10 ("bpf: Fix crash due to out of bounds access into reg2btf_ids."),
> > which fixes an out-of-bound access in the main feature in this series and
> > hasn't been backported to v5.16 yet. If it's convenient, could you
> > apply patch 10/10 to 5.16? I can send a separate patch for v5.16, if you
> > prefer.
>
> 5.16 is long end-of-life, sorry, I can't add any more patches to that
> tree and no one should be using it anymore.
>
> I'll go queue these up now for 5.15, thanks for the backports!
>
> greg k-h

Thank you Greg! I double checked and found that patch 10/10 is already
in v5.16. So we're good.

Hao