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

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Message-ID: <lztkbmwlx5h4more5pfvgfi7y4qj676hfemndmyipaslg2i4ui@cqnkmnoj46lp>
Date: Thu, 25 Apr 2024 23:35:56 -0400
From: Kent Overstreet <kent.overstreet@...ux.dev>
To: Matthew Wilcox <willy@...radead.org>
Cc: Kees Cook <keescook@...omium.org>, 
	Andrew Morton <akpm@...ux-foundation.org>, Suren Baghdasaryan <surenb@...gle.com>, linux-mm@...ck.org, 
	linux-kernel@...r.kernel.org, linux-hardening@...r.kernel.org
Subject: Re: [PATCH] alloc_tag: Tighten file permissions on /proc/allocinfo

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.