漏洞信息
# nfsd：允许在通过 nfs4_lookup_stateid() 搜索时使用 SC_STATUS_FREEABLE
## 漏洞概述
在Linux内核中，存在一个与`nfsd`相关的漏洞。该漏洞导致当pynfs的DELEG8测试运行时失败。具体来说，在获取委托（delegation）并让租约过期后，使用状态ID会导致返回错误的状态ID而非期望的撤销状态。
## 影响版本
未明确列出受影响的具体Linux内核版本。
## 细节
当一个委托被撤销时，它最初会被标记为`SC_STATUS_REVOKED`或`SC_STATUS_ADMIN_REVOKED`。随后，它会进一步被标记为带有`SC_STATUS_FREEABLE`标志，表示正在等待FREE_STATEID调用。
函数`nfs4_lookup_stateid()`接受一个状态掩码以指定允许的状态标志。当前的掩码不包含`SC_STATUS_FREEABLE`，导致撤销的委托几乎无法被找到。为此，解决方案是将`SC_STATUS_FREEABLE`添加到始终允许的状态标志中，并在`nfsd4_delegreturn()`函数中将其移除。
## 影响
该漏洞主要影响通过NFS进行文件管理的操作，特别是涉及委托处理和状态ID查找的场景。当执行特定测试（例如DELEG8测试）时，应用程序返回错误的状态ID而不是期望的结果，导致可能的应用程序行为异常。
备注
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漏洞标题
nfsd: allow SC_STATUS_FREEABLE when searching via nfs4_lookup_stateid()
漏洞描述信息
In the Linux kernel, the following vulnerability has been resolved:
nfsd: allow SC_STATUS_FREEABLE when searching via nfs4_lookup_stateid()
The pynfs DELEG8 test fails when run against nfsd. It acquires a
delegation and then lets the lease time out. It then tries to use the
deleg stateid and expects to see NFS4ERR_DELEG_REVOKED, but it gets
bad NFS4ERR_BAD_STATEID instead.
When a delegation is revoked, it's initially marked with
SC_STATUS_REVOKED, or SC_STATUS_ADMIN_REVOKED and later, it's marked
with the SC_STATUS_FREEABLE flag, which denotes that it is waiting for
s FREE_STATEID call.
nfs4_lookup_stateid() accepts a statusmask that includes the status
flags that a found stateid is allowed to have. Currently, that mask
never includes SC_STATUS_FREEABLE, which means that revoked delegations
are (almost) never found.
Add SC_STATUS_FREEABLE to the always-allowed status flags, and remove it
from nfsd4_delegreturn() since it's now always implied.
CVSS信息
N/A
漏洞类别
N/A