Re: CVE-2024-46701: libfs: fix infinite directory reads for offset dir

[Yu Kuai]

Hi,

在 2024/09/24 17:03, Greg KH 写道:
> On Tue, Sep 24, 2024 at 03:35:33PM +0800, Yu Kuai wrote:
> > Hi, all!
> >
> > This is a request to close this CVE.
> >
> > First of all, I think this really is not a kernel BUG, the deadloop
> > only exist in user side and user must rename between each readdir
> > syscall:
> >
> > while (readdr() > 0)
> > 	rename()
>
> Sounds like a real thing that users can do, so why does this not fit the
> definition of "vulnerability" as documented by cve.org?

If user want to trigger the deadloop that readdir never return 0, then
user must keep rename inside this dir asynchronously and *never stop*,
this looks like shooting oneself in the foot for me.
> > On the other hand, v6.6 is affected by this CVE, and this fix can't
> > be backported to v6.6 because the patchset [1] must be backported first
> > to expand offset from 32-bit to 64-bit.(This kind of refactor will
> > break kabi, hence it's not acceptable in our downstream kernels)
>
> That's your business decision, and does not affect if we do, or do not,
> assign a CVE at all.  Go work with your management if you wish to change
> this as it does not pertain to the community in any way.

Yes, I understand, This is just the reason why I tried to close this
CVE, please ignore this.

BTW, if you still think this CVE is valid, can we bakport the refactor
patchset to v6.6 as well? I can sent the patches to 6.6 lts, just let me
know.

Thanks,
Kuai

> thanks,
>
> greg k-h
> .