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author | Tomáš Trnka <ttrnka@mail.muni.cz> | 2016-05-20 16:41:10 +0200 |
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committer | Sasha Levin <sasha.levin@oracle.com> | 2016-06-06 19:12:33 -0400 |
commit | 9a9586d6bd8e09d49f17ccf50a4a371565e204f7 (patch) | |
tree | eb9e2038adf09f836d6cd9b9e985e6b41efed427 /kernel | |
parent | bd41a6cc5996b394b48b2f1a47b61cb6bb4d0bd3 (diff) |
sunrpc: fix stripping of padded MIC tokens
[ Upstream commit c0cb8bf3a8e4bd82e640862cdd8891400405cb89 ]
The length of the GSS MIC token need not be a multiple of four bytes.
It is then padded by XDR to a multiple of 4 B, but unwrap_integ_data()
would previously only trim mic.len + 4 B. The remaining up to three
bytes would then trigger a check in nfs4svc_decode_compoundargs(),
leading to a "garbage args" error and mount failure:
nfs4svc_decode_compoundargs: compound not properly padded!
nfsd: failed to decode arguments!
This would prevent older clients using the pre-RFC 4121 MIC format
(37-byte MIC including a 9-byte OID) from mounting exports from v3.9+
servers using krb5i.
The trimming was introduced by commit 4c190e2f913f ("sunrpc: trim off
trailing checksum before returning decrypted or integrity authenticated
buffer").
Fixes: 4c190e2f913f "unrpc: trim off trailing checksum..."
Signed-off-by: Tomáš Trnka <ttrnka@mail.muni.cz>
Cc: stable@vger.kernel.org
Acked-by: Jeff Layton <jlayton@poochiereds.net>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Signed-off-by: Sasha Levin <sasha.levin@oracle.com>
Diffstat (limited to 'kernel')
0 files changed, 0 insertions, 0 deletions