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From: David Howells <dhowells@redhat.com>
To: netdev@vger.kernel.org
Cc: dhowells@redhat.com, linux-afs@lists.infradead.org,
	linux-kernel@vger.kernel.org
Subject: [PATCH net-next 22/23] rxrpc: Make the parsing of xdr payloads more coherent
Date: Thu, 01 Oct 2020 15:59:17 +0100	[thread overview]
Message-ID: <160156435708.1728886.15158099093775622006.stgit@warthog.procyon.org.uk> (raw)
In-Reply-To: <160156420377.1728886.5309670328610130816.stgit@warthog.procyon.org.uk>

Make the parsing of xdr-encoded payloads, as passed to add_key, more
coherent.  Shuttling back and forth between various variables was a bit
hard to follow.

Signed-off-by: David Howells <dhowells@redhat.com>
---

 net/rxrpc/key.c |   16 ++++++++--------
 1 file changed, 8 insertions(+), 8 deletions(-)

diff --git a/net/rxrpc/key.c b/net/rxrpc/key.c
index c08827b87979..19b730b58516 100644
--- a/net/rxrpc/key.c
+++ b/net/rxrpc/key.c
@@ -135,7 +135,7 @@ static int rxrpc_preparse_xdr_rxkad(struct key_preparsed_payload *prep,
  */
 static int rxrpc_preparse_xdr(struct key_preparsed_payload *prep)
 {
-	const __be32 *xdr = prep->data, *token;
+	const __be32 *xdr = prep->data, *p;
 	const char *cp;
 	unsigned int len, paddedlen, loop, ntoken, toklen, sec_ix;
 	size_t datalen = prep->datalen;
@@ -189,20 +189,20 @@ static int rxrpc_preparse_xdr(struct key_preparsed_payload *prep)
 		goto not_xdr;
 
 	/* check each token wrapper */
-	token = xdr;
+	p = xdr;
 	loop = ntoken;
 	do {
 		if (datalen < 8)
 			goto not_xdr;
-		toklen = ntohl(*xdr++);
-		sec_ix = ntohl(*xdr);
+		toklen = ntohl(*p++);
+		sec_ix = ntohl(*p);
 		datalen -= 4;
 		_debug("token: [%x/%zx] %x", toklen, datalen, sec_ix);
 		paddedlen = (toklen + 3) & ~3;
 		if (toklen < 20 || toklen > datalen || paddedlen > datalen)
 			goto not_xdr;
 		datalen -= paddedlen;
-		xdr += paddedlen >> 2;
+		p += paddedlen >> 2;
 
 	} while (--loop > 0);
 
@@ -214,13 +214,11 @@ static int rxrpc_preparse_xdr(struct key_preparsed_payload *prep)
 	 * - we ignore the cellname, relying on the key to be correctly named
 	 */
 	do {
-		xdr = token;
 		toklen = ntohl(*xdr++);
-		token = xdr + ((toklen + 3) >> 2);
 		sec_ix = ntohl(*xdr++);
 		toklen -= 4;
 
-		_debug("TOKEN type=%u [%p-%p]", sec_ix, xdr, token);
+		_debug("TOKEN type=%x len=%x", sec_ix, toklen);
 
 		switch (sec_ix) {
 		case RXRPC_SECURITY_RXKAD:
@@ -234,6 +232,8 @@ static int rxrpc_preparse_xdr(struct key_preparsed_payload *prep)
 			goto error;
 		}
 
+		xdr += (toklen + 3) / 4;
+
 	} while (--ntoken > 0);
 
 	_leave(" = 0");



  parent reply	other threads:[~2020-10-01 14:59 UTC|newest]

Thread overview: 29+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-10-01 14:56 [PATCH net-next 00/23] rxrpc: Fixes and preparation for RxGK David Howells
2020-10-01 14:56 ` [PATCH net-next 01/23] keys: Provide the original description to the key preparser David Howells
2020-10-01 14:56 ` [PATCH net-next 02/23] rxrpc: Fix bundle counting for exclusive connections David Howells
2020-10-01 14:57 ` [PATCH net-next 03/23] rxrpc: Fix rxkad token xdr encoding David Howells
2020-10-01 14:57 ` [PATCH net-next 04/23] rxrpc: Downgrade the BUG() for unsupported token type in rxrpc_read() David Howells
2020-10-01 14:57 ` [PATCH net-next 05/23] rxrpc: Fix some missing _bh annotations on locking conn->state_lock David Howells
2020-10-01 14:57 ` [PATCH net-next 06/23] rxrpc: Fix loss of final ack on shutdown David Howells
2020-10-01 14:57 ` [PATCH net-next 07/23] rxrpc: Fix accept on a connection that need securing David Howells
2020-10-01 14:57 ` [PATCH net-next 08/23] rxrpc: The server keyring isn't network-namespaced David Howells
2020-10-01 14:57 ` [PATCH net-next 09/23] rxrpc: Change basic data packet size alignment to 1 David Howells
2020-10-01 14:57 ` [PATCH net-next 10/23] rxrpc: Remove the rxk5 security class as it's now defunct David Howells
2020-10-01 14:57 ` [PATCH net-next 11/23] rxrpc: List the held token types in the key description in /proc/keys David Howells
2020-10-01 14:58 ` [PATCH net-next 12/23] rxrpc: Allow for a security trailer in a packet David Howells
2020-10-01 14:58 ` [PATCH net-next 13/23] rxrpc: Merge prime_packet_security into init_connection_security David Howells
2020-10-01 14:58 ` [PATCH net-next 14/23] rxrpc: Support keys with multiple authentication tokens David Howells
2020-10-01 14:58 ` [PATCH net-next 15/23] rxrpc: Don't retain the server key in the connection David Howells
2020-10-01 14:58 ` [PATCH net-next 16/23] rxrpc: Split the server key type (rxrpc_s) into its own file David Howells
2020-10-01 14:58 ` [PATCH net-next 17/23] rxrpc: Hand server key parsing off to the security class David Howells
2020-10-01 14:58 ` [PATCH net-next 18/23] rxrpc: Don't reserve security header in Tx DATA skbuff David Howells
2020-10-01 14:58 ` [PATCH net-next 19/23] rxrpc: Organise connection security to use a union David Howells
2020-10-01 14:59 ` [PATCH net-next 20/23] rxrpc: Don't leak the service-side session key to userspace David Howells
2020-10-01 14:59 ` [PATCH net-next 21/23] rxrpc: Allow security classes to give more info on server keys David Howells
2020-10-01 14:59 ` David Howells [this message]
2020-10-01 14:59 ` [PATCH net-next 23/23] rxrpc: rxkad: Don't use pskb_pull() to advance through the response packet David Howells
2020-10-02 23:03 ` [PATCH net-next 00/23] rxrpc: Fixes and preparation for RxGK David Miller
2020-10-03 20:01 ` David Howells
2020-10-03 21:17   ` David Miller
2020-10-03 21:24   ` David Howells
2020-10-03 21:32     ` David Miller

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