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Date: Mon, 23 Nov 2020 00:17:27 -0300
From: √Črico Nogueira <ericonr@...root.org>
To: <musl@...ts.openwall.com>
Subject: Re: realpath without procfs -- should be ready for inclusion

On Sun Nov 22, 2020 at 11:03 PM -03, Alexey Izbyshev wrote:
> On 2020-11-23 01:56, Rich Felker wrote:
> > I originally considered keeping the procfs based version and only
> > using the new one as a fallback, but I discovered there are cases
> > (involving chroot, namespaces, etc.) where the answer from procfs is
> > wrong and validating it requires basically the same procedure as
> > implementing it manually (walking and performing readlink on each path
> > component).
> > 
> Pity that the simple and fast procfs-based implementation goes away. Do
> you have any specific example of a wrong answer from procfs at hand, or
> at least a more specific direction to look at than just
> "chroot/namespaces"?

bubblewrap (when driven by Flatpak) is one such software. Void carries
a patch [1] with NetBSD's realpath impl to work around this. Without it,
launching flatpak applications sometimes didn't work at all.

- [1] https://github.com/void-linux/void-packages/blob/da86d30391e2b3535e8f9dfae452d2b362887e41/srcpkgs/bubblewrap/patches/realpath-workaround.patch

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