From: Marc Dionne marc.dionne@auristor.com
[ Upstream commit 56305118e05b2db8d0395bba640ac9a3aee92624 ]
The session key should be encoded with just the 8 data bytes and no length; ENCODE_DATA precedes it with a 4 byte length, which confuses some existing tools that try to parse this format.
Add an ENCODE_BYTES macro that does not include a length, and use it for the key. Also adjust the expected length.
Note that commit 774521f353e1d ("rxrpc: Fix an assertion in rxrpc_read()") had fixed a BUG by changing the length rather than fixing the encoding. The original length was correct.
Fixes: 99455153d067 ("RxRPC: Parse security index 5 keys (Kerberos 5)") Signed-off-by: Marc Dionne marc.dionne@auristor.com Signed-off-by: David Howells dhowells@redhat.com Signed-off-by: Sasha Levin sashal@kernel.org --- net/rxrpc/key.c | 10 +++++++++- 1 file changed, 9 insertions(+), 1 deletion(-)
diff --git a/net/rxrpc/key.c b/net/rxrpc/key.c index 7fc340726d034..fd9260620824e 100644 --- a/net/rxrpc/key.c +++ b/net/rxrpc/key.c @@ -1139,6 +1139,14 @@ static long rxrpc_read(const struct key *key, goto fault; \ xdr += (_l + 3) >> 2; \ } while(0) +#define ENCODE_BYTES(l, s) \ + do { \ + u32 _l = (l); \ + memcpy(xdr, (s), _l); \ + if (_l & 3) \ + memcpy((u8 *)xdr + _l, &zero, 4 - (_l & 3)); \ + xdr += (_l + 3) >> 2; \ + } while(0) #define ENCODE64(x) \ do { \ __be64 y = cpu_to_be64(x); \ @@ -1167,7 +1175,7 @@ static long rxrpc_read(const struct key *key, case RXRPC_SECURITY_RXKAD: ENCODE(token->kad->vice_id); ENCODE(token->kad->kvno); - ENCODE_DATA(8, token->kad->session_key); + ENCODE_BYTES(8, token->kad->session_key); ENCODE(token->kad->start); ENCODE(token->kad->expiry); ENCODE(token->kad->primary_flag);