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SUNRPC: Add XDR encoding helper for opaque_auth

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RFC 5531 defines an MSG_ACCEPTED Reply message like this:

	struct accepted_reply {
		opaque_auth verf;
		union switch (accept_stat stat) {
		case SUCCESS:
		   ...

In the current server code, struct opaque_auth encoding is open-
coded. Introduce a helper that encodes an opaque_auth data item
within the context of a xdr_stream.

Done as part of hardening the server-side RPC header decoding and
encoding paths.

Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
This commit is contained in:
Chuck Lever
2023-01-08 11:29:38 -05:00
parent 6d037b15e4
commit 7b402c8db6
2 changed files with 31 additions and 0 deletions
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2
include/linux/sunrpc/xdr.h
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@@ -348,6 +348,8 @@ ssize_t xdr_stream_decode_string_dup(struct xdr_stream *xdr, char **str,
size_t maxlen, gfp_t gfp_flags);
ssize_t xdr_stream_decode_opaque_auth(struct xdr_stream *xdr, u32 *flavor,
void **body, unsigned int *body_len);
ssize_t xdr_stream_encode_opaque_auth(struct xdr_stream *xdr, u32 flavor,
void *body, unsigned int body_len);
/**
* xdr_align_size - Calculate padded size of an object