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Message-ID: <4a1bcb698b4dc6eeca2816528e5dd9a3bae53af0.camel@kernel.org>
Subject: Re: [PATCH v2 00/12] cachefiles: some bugfixes and cleanups for
 ondemand requests
From: Jeff Layton <jlayton@kernel.org>
To: libaokun@huaweicloud.com, netfs@lists.linux.dev, dhowells@redhat.com
Cc: hsiangkao@linux.alibaba.com, jefflexu@linux.alibaba.com, 
 zhujia.zj@bytedance.com, linux-erofs@lists.ozlabs.org, 
 linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, 
 yangerkun@huawei.com, houtao1@huawei.com, yukuai3@huawei.com,
 wozizhi@huawei.com,  Baokun Li <libaokun1@huawei.com>
Date: Sun, 19 May 2024 06:56:04 -0400
In-Reply-To: <20240515084601.3240503-1-libaokun@huaweicloud.com>
References: <20240515084601.3240503-1-libaokun@huaweicloud.com>
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On Wed, 2024-05-15 at 16:45 +0800, libaokun@huaweicloud.com wrote:
> From: Baokun Li <libaokun1@huawei.com>
>=20
> Hi all!
>=20
> This is the second version of this patch series. Thank you, Jia Zhu and
> Jingbo Xu, for the feedback in the previous version.
>=20
> We've been testing ondemand mode for cachefiles since January, and we're
> almost done. We hit a lot of issues during the testing period, and this
> patch set fixes some of the issues related to ondemand requests.
> The patches have passed internal testing without regression.
>=20
> The following is a brief overview of the patches, see the patches for
> more details.
>=20
> Patch 1-5: Holding reference counts of reqs and objects on read requests
> to avoid malicious restore leading to use-after-free.
>=20
> Patch 6-10: Add some consistency checks to copen/cread/get_fd to avoid
> malicious copen/cread/close fd injections causing use-after-free or hung.
>=20
> Patch 11: When cache is marked as CACHEFILES_DEAD, flush all requests,
> otherwise the kernel may be hung. since this state is irreversible, the
> daemon can read open requests but cannot copen.
>=20
> Patch 12: Allow interrupting a read request being processed by killing
> the read process as a way of avoiding hung in some special cases.
>=20
> Comments and questions are, as always, welcome.
> Please let me know what you think.
>=20
> Thanks,
> Baokun
>=20
> Changes since v1:
>   * Collect RVB from Jia Zhu and Jingbo Xu.(Thanks for your review!)
>   * Pathch 1: Add Fixes tag and enrich the commit message.
>   * Pathch 7: Add function graph comments.
>   * Pathch 8: Update commit message and comments.
>   * Pathch 9: Enriched commit msg.
>=20
> Baokun Li (11):
>   cachefiles: remove request from xarry during flush requests
>   cachefiles: remove err_put_fd tag in cachefiles_ondemand_daemon_read()
>   cachefiles: fix slab-use-after-free in cachefiles_ondemand_get_fd()
>   cachefiles: fix slab-use-after-free in
>     cachefiles_ondemand_daemon_read()
>   cachefiles: add output string to cachefiles_obj_[get|put]_ondemand_fd
>   cachefiles: add consistency check for copen/cread
>   cachefiles: add spin_lock for cachefiles_ondemand_info
>   cachefiles: never get a new anonymous fd if ondemand_id is valid
>   cachefiles: defer exposing anon_fd until after copy_to_user() succeeds
>   cachefiles: flush all requests after setting CACHEFILES_DEAD
>   cachefiles: make on-demand read killable
>=20
> Zizhi Wo (1):
>   cachefiles: Set object to close if ondemand_id < 0 in copen
>=20
>  fs/cachefiles/daemon.c            |   3 +-
>  fs/cachefiles/internal.h          |   5 +
>  fs/cachefiles/ondemand.c          | 218 ++++++++++++++++++++++--------
>  include/trace/events/cachefiles.h |   8 +-
>  4 files changed, 177 insertions(+), 57 deletions(-)
>=20

Looks like most of these are fixes inside the ondemand code, which I
don't have the greatest grasp of, so...

Acked-by: Jeff Layton <jlayton@kernel.org>