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CVE-2022-48827
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Description
In the Linux kernel, the following vulnerability has been resolved:
NFSD: Fix the behavior of READ near OFFSET_MAX
Dan Aloni reports:
Due to commit 8cfb9015280d (“NFS: Always provide aligned buffers to
the RPC read layers”) on the client, a read of 0xfff is aligned up
to server rsize of 0x1000.As a result, in a test where the server has a file of size
0x7fffffffffffffff, and the client tries to read from the offset
0x7ffffffffffff000, the read causes loff_t overflow in the server
and it returns an NFS code of EINVAL to the client. The client as
a result indefinitely retries the request.
The Linux NFS client does not handle NFS?ERR_INVAL, even though all
NFS specifications permit servers to return that status code for a
READ.
Instead of NFS?ERR_INVAL, have out-of-range READ requests succeed
and return a short result. Set the EOF flag in the result to prevent
the client from retrying the READ request. This behavior appears to
be consistent with Solaris NFS servers.
Note that NFSv3 and NFSv4 use u64 offset values on the wire. These
must be converted to loff_t internally before use — an implicit
type cast is not adequate for this purpose. Otherwise VFS checks
against sb->s_maxbytes do not work properly.
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