linux-kernel - [PATCH 0/5] cachefiles: some bugfixes for clean object/send req/poll

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Date: Wed, 24 Apr 2024 11:34:04 +0800
From: libaokun@...weicloud.com
To: netfs@...ts.linux.dev
Cc: dhowells@...hat.com,
	jlayton@...nel.org,
	zhujia.zj@...edance.com,
	jefflexu@...ux.alibaba.com,
	linux-cachefs@...hat.com,
	linux-erofs@...ts.ozlabs.org,
	linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	libaokun@...weicloud.com,
	Baokun Li <libaokun1@...wei.com>
Subject: [PATCH 0/5] cachefiles: some bugfixes for clean object/send req/poll

From: Baokun Li <libaokun1@...wei.com>

Hello everyone!

Recently we found some bugs while doing tests on cachefiles ondemand mode,
and this patchset is a fix for some of those issues. The following is a
brief overview of the patches, see the patches for more details.

Patch 1-3: After an object has been cleaned up, make sure it has no
outstanding requests and that the corresponding ondemand_object_worker
has exited, otherwise it may use-after-free.

Patch 4: Cyclic allocation of msg_id to avoid msg_id reuse misleading
the daemon to cause hung.

Patch 5: Hold xas_lock during polling to avoid dereferencing reqs causing
use-after-free.

Comments and questions are, as always, welcome.

Thanks,
Baokun

Baokun Li (3):
  cachefiles: stop sending new request when dropping object
  cachefiles: flush all requests for the object that is being dropped
  cachefiles: cyclic allocation of msg_id to avoid reuse

Hou Tao (1):
  cachefiles: flush ondemand_object_worker during clean object

Jingbo Xu (1):
  cachefiles: add missing lock protection when polling

 fs/cachefiles/daemon.c   |   4 +-
 fs/cachefiles/internal.h |   3 +
 fs/cachefiles/ondemand.c | 120 ++++++++++++++++++++++++++-------------
 3 files changed, 86 insertions(+), 41 deletions(-)

-- 
2.39.2