linux-kernel - Re: [PATCH v2 05/16] overlayfs: Use ovl_override_creds_light()/revert_creds

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Message-ID: <CAJfpegtko6VtNpshGUzZixE0jqecwQR91xT=Q7W5sf6HPGVPeQ@mail.gmail.com>
Date: Thu, 22 Aug 2024 10:26:14 +0200
From: Miklos Szeredi <miklos@...redi.hu>
To: Vinicius Costa Gomes <vinicius.gomes@...el.com>
Cc: brauner@...nel.org, amir73il@...il.com, hu1.chen@...el.com, 
	malini.bhandaru@...el.com, tim.c.chen@...el.com, mikko.ylinen@...el.com, 
	lizhen.you@...el.com, linux-unionfs@...r.kernel.org, 
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 05/16] overlayfs: Use ovl_override_creds_light()/revert_creds_light()

On Thu, 22 Aug 2024 at 03:25, Vinicius Costa Gomes
<vinicius.gomes@...el.com> wrote:
>
> Convert to use ovl_override_creds_light()/revert_creds_light(), these
> functions assume that the critical section won't modify the usage
> counter of the credentials in question.
>
> In most overlayfs instances, the credentials lifetime is the duration

Why most instances?  AFAICS the creds have the same lifetime as the
overlayfs superblock.

Thanks,
Miklos