linux-kernel - Re: [PATCH bpf-next 3/4] bpf: Introduce path iterator

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Message-ID: <20250528223724.GE2023217@ZenIV>
Date: Wed, 28 May 2025 23:37:24 +0100
From: Al Viro <viro@...iv.linux.org.uk>
To: Song Liu <song@...nel.org>
Cc: bpf@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-security-module@...r.kernel.org,
	kernel-team@...a.com, andrii@...nel.org, eddyz87@...il.com,
	ast@...nel.org, daniel@...earbox.net, martin.lau@...ux.dev,
	brauner@...nel.org, jack@...e.cz, kpsingh@...nel.org,
	mattbobrowski@...gle.com, amir73il@...il.com, repnop@...gle.com,
	jlayton@...nel.org, josef@...icpanda.com, mic@...ikod.net,
	gnoack@...gle.com
Subject: Re: [PATCH bpf-next 3/4] bpf: Introduce path iterator

On Wed, May 28, 2025 at 03:26:22PM -0700, Song Liu wrote:
> Introduce a path iterator, which reliably walk a struct path.

No, it does not.  If you have no external warranty that mount
*and* dentry trees are stable, it's not reliable at all.

And I'm extremely suspicious regarding the validity of anything
that pokes around in mount trees.  There is a very good reason
struct mount is *not* visible in include/linux/*.h