CVE-2022-48827

published 2024-07-16

CVE-2022-48827: 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…

Priority P4 32 high 7.1 CVSS 3.1

AV L AC L PR L UI N S U C H I N A H

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.

Affected

14 ranges

Vendor	Product	Version range	Fixed in
debian	linux	< linux 5.16.10-1 (bookworm)	linux 5.16.10-1 (bookworm)
linux	linux	—	—
linux	linux	>= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 1726a39b0879acfb490b22dca643f26f4f907da9	1726a39b0879acfb490b22dca643f26f4f907da9
linux	linux	>= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < c6eff5c4277146a78b4fb8c9b668dd64542c41b0	c6eff5c4277146a78b4fb8c9b668dd64542c41b0
linux	linux	>= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 44502aca8e02ab32d6b0eb52e006a5ec9402719b	44502aca8e02ab32d6b0eb52e006a5ec9402719b
linux	linux	>= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 0cb4d23ae08c48f6bf3c29a8e5c4a74b8388b960	0cb4d23ae08c48f6bf3c29a8e5c4a74b8388b960
linux	linux_kernel	< 5.10.220	5.10.220
linux	linux_kernel	—	—
linux	linux_kernel	>= 0 < 5.10.221-1	5.10.221-1
linux	linux_kernel	>= 0 < 5.16.10-1	5.16.10-1
linux	linux_kernel	>= 0 < 5.16.10-1	5.16.10-1
linux	linux_kernel	>= 0 < 5.16.10-1	5.16.10-1
linux	linux_kernel	>= 5.11 < 5.15.24	5.15.24
linux	linux_kernel	>= 5.16 < 5.16.10	5.16.10

CVSS provenance

nvd v3.1 7.1 HIGH CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H

osv 7.1 HIGH

vendor_debian 7.1 HIGH

vendor_redhat 7.1 HIGH

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