Re: [PATCH] alloc_tag: Tighten file permissions on /proc/allocinfo

[Kent Overstreet]

On Fri, Apr 26, 2024 at 04:25:40AM +0100, Matthew Wilcox wrote:
> On Thu, Apr 25, 2024 at 08:58:34PM -0400, Kent Overstreet wrote:
> > On Thu, Apr 25, 2024 at 05:43:33PM -0700, Kees Cook wrote:
> > > All this said, I'm still not excited about any of these files living
> > > in /proc at all -- we were supposed to use /sys for this kind of thing,
> > > but its interface wasn't great for this kind of more "free-form" data,
> > > and debugfs isn't good for production interfaces. /proc really should
> > > only have pid information -- we end up exposing these top-level files to
> > > every mount namespace with a /proc mount. :( But that's a yet-to-be-solved
> > > problem...
> > 
> > It really wouldn't be that hard to relax the 4k file limit in sysfs.
> 
> It's a lot harder to relax the GregKH opposition to multiple values per
> file in sysfs.

Which makes no sense for columnar data.