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Registered in England and Wales under Company Registration No. 3798903 Subject: [PATCH net-next 11/17] rxrpc: Ignore unknown tokens in key payload unless no known tokens From: David Howells To: netdev@vger.kernel.org Cc: dhowells@redhat.com, linux-afs@lists.infradead.org, linux-kernel@vger.kernel.org Date: Mon, 23 Nov 2020 20:11:21 +0000 Message-ID: <160616228111.830164.18024627408904902488.stgit@warthog.procyon.org.uk> In-Reply-To: <160616220405.830164.2239716599743995145.stgit@warthog.procyon.org.uk> References: <160616220405.830164.2239716599743995145.stgit@warthog.procyon.org.uk> User-Agent: StGit/0.23 MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit X-Scanned-By: MIMEDefang 2.79 on 10.5.11.16 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org When parsing a payload for an rxrpc-type key, ignore any tokens that are not of a known type and don't give an error for them - unless there are no tokens of a known type. Signed-off-by: David Howells --- net/rxrpc/key.c | 31 +++++++++++++++++++++---------- 1 file changed, 21 insertions(+), 10 deletions(-) diff --git a/net/rxrpc/key.c b/net/rxrpc/key.c index a9d8f5b466be..7e6d19263ce3 100644 --- a/net/rxrpc/key.c +++ b/net/rxrpc/key.c @@ -139,7 +139,7 @@ static int rxrpc_preparse_xdr(struct key_preparsed_payload *prep) const char *cp; unsigned int len, paddedlen, loop, ntoken, toklen, sec_ix; size_t datalen = prep->datalen; - int ret; + int ret, ret2; _enter(",{%x,%x,%x,%x},%zu", ntohl(xdr[0]), ntohl(xdr[1]), ntohl(xdr[2]), ntohl(xdr[3]), @@ -213,6 +213,7 @@ static int rxrpc_preparse_xdr(struct key_preparsed_payload *prep) /* okay: we're going to assume it's valid XDR format * - we ignore the cellname, relying on the key to be correctly named */ + ret = -EPROTONOSUPPORT; do { toklen = ntohl(*xdr++); token = xdr; @@ -225,27 +226,37 @@ static int rxrpc_preparse_xdr(struct key_preparsed_payload *prep) switch (sec_ix) { case RXRPC_SECURITY_RXKAD: - ret = rxrpc_preparse_xdr_rxkad(prep, datalen, token, toklen); - if (ret != 0) - goto error; + ret2 = rxrpc_preparse_xdr_rxkad(prep, datalen, token, toklen); + break; + default: + ret2 = -EPROTONOSUPPORT; break; + } + switch (ret2) { + case 0: + ret = 0; + break; + case -EPROTONOSUPPORT: + break; + case -ENOPKG: + if (ret != 0) + ret = -ENOPKG; + break; default: - ret = -EPROTONOSUPPORT; + ret = ret2; goto error; } } while (--ntoken > 0); - _leave(" = 0"); - return 0; +error: + _leave(" = %d", ret); + return ret; not_xdr: _leave(" = -EPROTO"); return -EPROTO; -error: - _leave(" = %d", ret); - return ret; } /*