Vulnerability CVE-2022-48828
Published: 2024-07-16

Description:
In the Linux kernel, the following vulnerability has been resolved:

NFSD: Fix ia_size underflow

iattr::ia_size is a loff_t, which is a signed 64-bit type. NFSv3 and
NFSv4 both define file size as an unsigned 64-bit type. Thus there
is a range of valid file size values an NFS client can send that is
already larger than Linux can handle.

Currently decode_fattr4() dumps a full u64 value into ia_size. If
that value happens to be larger than S64_MAX, then ia_size
underflows. I'm about to fix up the NFSv3 behavior as well, so let's
catch the underflow in the common code path: nfsd_setattr().

 References:
https://git.kernel.org/stable/c/38d02ba22e43b6fc7d291cf724bc6e3b7be6626b
https://git.kernel.org/stable/c/8e0ecaf7a7e57b30284d6b3289cc436100fadc48
https://git.kernel.org/stable/c/da22ca1ad548429d7822011c54cfe210718e0aa7
https://git.kernel.org/stable/c/e6faac3f58c7c4176b66f63def17a34232a17b0e
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