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

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Message-ID: <87a5gylwo3.fsf@intel.com>
Date: Mon, 26 Aug 2024 15:57:32 -0700
From: Vinicius Costa Gomes <vinicius.gomes@...el.com>
To: Miklos Szeredi <miklos@...redi.hu>
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()

Miklos Szeredi <miklos@...redi.hu> writes:

> 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.
>

I may be reading the code wrong, but on file creation some of the
credentials that are worked on come from the task(?).


Cheers,
-- 
Vinicius