From: libaokun@huaweicloud.com
To: netfs@lists.linux.dev
Cc: dhowells@redhat.com, jlayton@kernel.org, zhujia.zj@bytedance.com,
jefflexu@linux.alibaba.com, linux-erofs@lists.ozlabs.org,
linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org,
libaokun@huaweicloud.com, Zizhi Wo <wozizhi@huawei.com>,
Baokun Li <libaokun1@huawei.com>
Subject: [PATCH 10/12] cachefiles: Set object to close if ondemand_id < 0 in copen
Date: Wed, 24 Apr 2024 11:39:14 +0800 [thread overview]
Message-ID: <20240424033916.2748488-11-libaokun@huaweicloud.com> (raw)
In-Reply-To: <20240424033916.2748488-1-libaokun@huaweicloud.com>
From: Zizhi Wo <wozizhi@huawei.com>
If copen is maliciously called in the user mode, it may delete the request
corresponding to the random id. And the request may have not been read yet.
Note that when the object is set to reopen, the open request will be done
with the still reopen state in above case. As a result, the request
corresponding to this object is always skipped in select_req function, so
the read request is never completed and blocks other process.
Fix this issue by simply set object to close if its id < 0 in copen.
Signed-off-by: Zizhi Wo <wozizhi@huawei.com>
Signed-off-by: Baokun Li <libaokun1@huawei.com>
---
fs/cachefiles/ondemand.c | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
diff --git a/fs/cachefiles/ondemand.c b/fs/cachefiles/ondemand.c
index 7c2d43104120..673e7ad52041 100644
--- a/fs/cachefiles/ondemand.c
+++ b/fs/cachefiles/ondemand.c
@@ -182,6 +182,7 @@ int cachefiles_ondemand_copen(struct cachefiles_cache *cache, char *args)
xas_store(&xas, NULL);
xa_unlock(&cache->reqs);
+ info = req->object->ondemand;
/* fail OPEN request if copen format is invalid */
ret = kstrtol(psize, 0, &size);
if (ret) {
@@ -201,7 +202,6 @@ int cachefiles_ondemand_copen(struct cachefiles_cache *cache, char *args)
goto out;
}
- info = req->object->ondemand;
spin_lock(&info->lock);
/* The anonymous fd was closed before copen ? */
if (info->ondemand_id == CACHEFILES_ONDEMAND_ID_CLOSED) {
@@ -222,6 +222,11 @@ int cachefiles_ondemand_copen(struct cachefiles_cache *cache, char *args)
wake_up_all(&cache->daemon_pollwq);
out:
+ spin_lock(&info->lock);
+ /* Need to set object close to avoid reopen status continuing */
+ if (info->ondemand_id == CACHEFILES_ONDEMAND_ID_CLOSED)
+ cachefiles_ondemand_set_object_close(req->object);
+ spin_unlock(&info->lock);
complete(&req->done);
return ret;
}
--
2.39.2
next prev parent reply other threads:[~2024-04-24 3:48 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-04-24 3:39 [PATCH 00/12] cachefiles: some bugfixes and cleanups for ondemand requests libaokun
2024-04-24 3:39 ` [PATCH 01/12] cachefiles: remove request from xarry during flush requests libaokun
2024-04-25 3:13 ` Jia Zhu
2024-05-06 3:48 ` Jingbo Xu
2024-05-06 3:57 ` Baokun Li
2024-05-06 5:50 ` Jingbo Xu
2024-05-07 6:52 ` Baokun Li
2024-04-24 3:39 ` [PATCH 02/12] cachefiles: remove err_put_fd tag in cachefiles_ondemand_daemon_read() libaokun
2024-04-25 3:17 ` Jia Zhu
2024-05-06 3:55 ` Jingbo Xu
2024-05-06 4:02 ` Baokun Li
2024-04-24 3:39 ` [PATCH 03/12] cachefiles: fix slab-use-after-free in cachefiles_ondemand_get_fd() libaokun
2024-04-24 14:55 ` Jia Zhu
2024-04-25 1:33 ` Baokun Li
2024-04-25 3:39 ` Jia Zhu
2024-04-24 3:39 ` [PATCH 04/12] cachefiles: fix slab-use-after-free in cachefiles_ondemand_daemon_read() libaokun
2024-04-25 3:42 ` [External] " Jia Zhu
2024-04-24 3:39 ` [PATCH 05/12] cachefiles: add output string to cachefiles_obj_[get|put]_ondemand_fd libaokun
2024-04-24 3:39 ` [PATCH 06/12] cachefiles: add consistency check for copen/cread libaokun
2024-05-06 2:31 ` Jingbo Xu
2024-05-06 3:12 ` Baokun Li
2024-04-24 3:39 ` [PATCH 07/12] cachefiles: add spin_lock for cachefiles_ondemand_info libaokun
2024-05-06 2:55 ` Jingbo Xu
2024-05-06 3:23 ` Baokun Li
2024-04-24 3:39 ` [PATCH 08/12] cachefiles: never get a new anon fd if ondemand_id is valid libaokun
2024-05-06 3:09 ` Jingbo Xu
2024-05-07 9:32 ` Baokun Li
2024-04-24 3:39 ` [PATCH 09/12] cachefiles: defer exposing anon_fd until after copy_to_user() succeeds libaokun
2024-05-06 3:24 ` Jingbo Xu
2024-05-06 3:34 ` Baokun Li
2024-04-24 3:39 ` libaokun [this message]
2024-04-25 4:56 ` [PATCH 10/12] cachefiles: Set object to close if ondemand_id < 0 in copen Jia Zhu
2024-04-24 3:39 ` [PATCH 11/12] cachefiles: flush all requests after setting CACHEFILES_DEAD libaokun
2024-04-24 3:39 ` [PATCH 12/12] cachefiles: make on-demand read killable libaokun
2024-04-25 5:15 ` Jia Zhu
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