linux-kernel - Re: [PATCH] crypto: ccp - Fix the INIT

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Date:   Wed, 13 Apr 2022 09:40:12 -0600
From:   Peter Gonda <pgonda@...gle.com>
To:     Jacky Li <jackyli@...gle.com>
Cc:     Brijesh Singh <brijesh.singh@....com>,
        Tom Lendacky <thomas.lendacky@....com>,
        John Allen <john.allen@....com>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        "David S. Miller" <davem@...emloft.net>,
        Marc Orr <marcorr@...gle.com>, Alper Gun <alpergun@...gle.com>,
        Linux Crypto Mailing List <linux-crypto@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] crypto: ccp - Fix the INIT_EX data file open failure

On Mon, Apr 11, 2022 at 12:00 PM Jacky Li <jackyli@...gle.com> wrote:
>
> There are 2 common cases when INIT_EX data file might not be
> opened successfully and fail the sev initialization:
>
> 1. In user namespaces, normal user tasks (e.g. VMM) can change their
>    current->fs->root to point to arbitrary directories. While
>    init_ex_path is provided as a module param related to root file
>    system. Solution: use the root directory of init_task to avoid
>    accessing the wrong file.
>
> 2. Normal user tasks (e.g. VMM) don't have the privilege to access
>    the INIT_EX data file. Solution: open the file as root and
>    restore permissions immediately.
>
> Signed-off-by: Jacky Li <jackyli@...gle.com>

Reviewed-by: Peter Gonda <pgonda@...gle.com>

Agreed about the fixes tag.