Re: [PATCH v13 10/12] famfs: Add runtime operation-permission (opts) framework

Gregory Price <[email protected]>
Newsgroups dev.linux.lists.fuse-devel,dev.linux.lists.nvdimm,org.kernel.vger.linux-cxl,org.kernel.vger.linux-doc,org.kernel.vger.linux-fsdevel,org.kernel.vger.linux-kernel
Message-ID <aokdSo9li0RtEt35@gourry-fedora-PF4VCD3F> 
On Fri, Aug 21, 2026 at 05:07:28PM -0700, Darrick J. Wong wrote:
> 
> But what prevents a malicious program that is /not/ the famfs client
> software but has CAP_SYS_ADMIN from doing that?
> 

Such a program can already unmount famfs, rebind the device to
device_dax, and mmap the whole range directly. MAP_CREATE isn't
handing it reach it didn't have.

~Gregory
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