From a0584ee9aed805446b044ce855e67264f0dc619e Mon Sep 17 00:00:00 2001 From: Chuck Lever Date: Mon, 11 Feb 2019 11:24:58 -0500 Subject: SUNRPC: Use struct xdr_stream when decoding RPC Reply header Modernize and harden the code path that parses an RPC Reply message. Signed-off-by: Chuck Lever Signed-off-by: Anna Schumaker --- net/sunrpc/auth_unix.c | 42 +++++++++++++++++++++++------------------- 1 file changed, 23 insertions(+), 19 deletions(-) (limited to 'net/sunrpc/auth_unix.c') diff --git a/net/sunrpc/auth_unix.c b/net/sunrpc/auth_unix.c index 1d5b7ed9c6f7..5ea84a96f96e 100644 --- a/net/sunrpc/auth_unix.c +++ b/net/sunrpc/auth_unix.c @@ -160,29 +160,32 @@ unx_refresh(struct rpc_task *task) return 0; } -static __be32 * -unx_validate(struct rpc_task *task, __be32 *p) +static int +unx_validate(struct rpc_task *task, struct xdr_stream *xdr) { - rpc_authflavor_t flavor; - u32 size; - - flavor = ntohl(*p++); - if (flavor != RPC_AUTH_NULL && - flavor != RPC_AUTH_UNIX && - flavor != RPC_AUTH_SHORT) { - printk("RPC: bad verf flavor: %u\n", flavor); - return ERR_PTR(-EIO); - } + __be32 *p; + u32 size; - size = ntohl(*p++); - if (size > RPC_MAX_AUTH_SIZE) { - printk("RPC: giant verf size: %u\n", size); - return ERR_PTR(-EIO); + p = xdr_inline_decode(xdr, 2 * sizeof(*p)); + if (!p) + return -EIO; + switch (*p++) { + case rpc_auth_null: + case rpc_auth_unix: + case rpc_auth_short: + break; + default: + return -EIO; } - task->tk_rqstp->rq_cred->cr_auth->au_rslack = (size >> 2) + 2; - p += (size >> 2); + size = be32_to_cpup(p); + if (size > RPC_MAX_AUTH_SIZE) + return -EIO; + p = xdr_inline_decode(xdr, size); + if (!p) + return -EIO; - return p; + task->tk_rqstp->rq_cred->cr_auth->au_rslack = (size >> 2) + 2; + return 0; } int __init rpc_init_authunix(void) @@ -223,4 +226,5 @@ const struct rpc_credops unix_credops = { .crwrap_req = rpcauth_wrap_req_encode, .crrefresh = unx_refresh, .crvalidate = unx_validate, + .crunwrap_resp = rpcauth_unwrap_resp_decode, }; -- cgit