linux-kernel - Re: [PATCH v2 04/16] overlayfs: Document critical override

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Message-ID: <CAJfpegvx2nyVpp4kHaxt=VwBb3U4=7GM-pjW_8bu+fm_N8diHQ@mail.gmail.com>
Date: Thu, 22 Aug 2024 10:14:58 +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 04/16] overlayfs: Document critical override_creds() operations

On Thu, 22 Aug 2024 at 03:25, Vinicius Costa Gomes
<vinicius.gomes@...el.com> wrote:
>
> Add a comment to these operations that cannot use the _light version
> of override_creds()/revert_creds(), because during the critical
> section the struct cred .usage counter might be modified.

Why is it a problem if the usage counter is modified?  Why is the
counter modified in each of these cases?

Thanks,
Miklos