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Fri, 13 Mar 2026 06:23:49 -0700 (PDT) Received: from fedora ([179.105.152.20]) by smtp.gmail.com with ESMTPSA id a92af1059eb24-128f6384f6csm1846358c88.9.2026.03.13.06.23.45 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 13 Mar 2026 06:23:49 -0700 (PDT) From: Anderson Nascimento To: dhowells@redhat.com Cc: marc.dionne@auristor.com, davem@davemloft.net, edumazet@google.com, kuba@kernel.org, pabeni@redhat.com, horms@kernel.org, linux-afs@lists.infradead.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, Anderson Nascimento Subject: [PATCH 1/2] rxrpc: Fix keyring reference count leak in rxrpc_setsockopt() Date: Fri, 13 Mar 2026 10:23:26 -0300 Message-ID: <20260313132327.409785-2-anderson@allelesecurity.com> X-Mailer: git-send-email 2.52.0 In-Reply-To: <20260313132327.409785-1-anderson@allelesecurity.com> References: <20260313132327.409785-1-anderson@allelesecurity.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" In rxrpc_setsockopt(), the code checks 'rx->key' when handling the RXRPC_SECURITY_KEYRING option. However, this appears to be a logic error. The code should be checking 'rx->securities' to determine if a keyring has already been defined for the socket. Currently, if a user calls setsockopt(RXRPC_SECURITY_KEYRING) multiple times on the same socket, the check 'if (rx->key)' fails to block subsequent calls because 'rx->key' has not been defined by the function. This results in a reference count leak on the keyring. This patch changes the check to 'rx->securities' to correctly identify if the socket security keyring has already been configured, returning -EINV= AL on subsequent attempts. Before the patch: It shows the keyring reference counter elevated. $ cat /proc/keys | grep AFSkeys1 27aca8ae I--Q--- 24469721 perm 3f010000 1000 1000 keyring AFSkeys1: emp= ty $ After the patch: The keyring reference counter remains stable and subsequent calls return an= error: $ ./poc setsockopt: Invalid argument $ Fixes: 17926a7 ("[AF_RXRPC]: Provide secure RxRPC sockets for use by usersp= ace and kernel both") Signed-off-by: Anderson Nascimento --- net/rxrpc/af_rxrpc.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/net/rxrpc/af_rxrpc.c b/net/rxrpc/af_rxrpc.c index 0c2c68c4b07e..add72ac61f73 100644 --- a/net/rxrpc/af_rxrpc.c +++ b/net/rxrpc/af_rxrpc.c @@ -663,7 +663,7 @@ static int rxrpc_setsockopt(struct socket *sock, int le= vel, int optname, =20 case RXRPC_SECURITY_KEYRING: ret =3D -EINVAL; - if (rx->key) + if (rx->securities) goto error; ret =3D -EISCONN; if (rx->sk.sk_state !=3D RXRPC_UNBOUND) --=20 2.53.0