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| author | Jeff Layton <jlayton@kernel.org> | 2026-05-30 09:19:25 -0400 |
|---|---|---|
| committer | Chuck Lever <cel@kernel.org> | 2026-08-10 09:54:35 -0400 |
| commit | 041f57056e5fb9c80adc088269322d2c61074406 (patch) | |
| tree | fedb9811324669b8c09b6887b7554cce15ef011f /tools/lib/python/kdoc/python_version.py | |
| parent | 4bc1108e876153a2dd6d874052b99182c3603135 (diff) | |
nfsd: validate symlink target length in NFSv4 CREATE
nfsd4_decode_create() accepts an unbounded cr_datalen from the wire for
NF4LNK symlink targets, allowing a client to force a kmalloc of up to
the maximum RPC payload size (several MiB) per COMPOUND op that persists
until compound teardown. The VFS rejects oversized targets with
ENAMETOOLONG, but the allocation has already occurred.
Reject cr_datalen == 0 early with nfserr_inval and cr_datalen greater
than NFS4_MAXPATHLEN (PATH_MAX) with nfserr_nametoolong to bound the
allocation.
Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Cc: stable@vger.kernel.org
Assisted-by: kres:claude-opus-4-7
Reported-by: Chris Mason <clm@meta.com>
Signed-off-by: Jeff Layton <jlayton@kernel.org>
Link: https://patch.msgid.link/20260530-nfsd-fixes-v2-9-f27e8eb4d974@kernel.org
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Diffstat (limited to 'tools/lib/python/kdoc/python_version.py')
0 files changed, 0 insertions, 0 deletions