From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id C3CE83B6347 for ; Sun, 3 May 2026 14:17:31 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1777817851; cv=none; b=hCdYiQOUQdTdiub9zGMBaMgsn8CFypt0Grcu/XX7AQivM3i3U/Bet+iRtmPfe3ZWh54eEWso4OCbWFmVCSxLgYORaJmdBdio0rbCR2FcP0EzG8SX7lAsDXzvMMi7UqHUXHZfLPbsFsAFus/sCBLksqSfIdL5GFIOv0W0CUJSjOQ= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1777817851; c=relaxed/simple; bh=JcOwAeWxWC3AjsNuOCFjgkz2au8gfAfu0nkNIMWYtog=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=JCs8vP9nFXlKr6ax3d5HrTFdVnZFCCSR92iTCjLItZ0AcnJhXmfFd1v7Zo93RqOuBYSHIdYDHwKtiMHA03qwwmimmmXU/0/blTEBwnKzI/+eCw7rq/bgs0hiIihz9YvFeTVaxldCuDN/fzhbqNfzZ71Xo2Fr5v1j8uWmOO9hCxg= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=XXnxKxD/; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="XXnxKxD/" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 85FD8C2BCB4; Sun, 3 May 2026 14:17:28 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1777817851; bh=JcOwAeWxWC3AjsNuOCFjgkz2au8gfAfu0nkNIMWYtog=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=XXnxKxD/H60gSU4tLmPqcJcDoceC6H6eGyo/2Nyw/Fzu0SZTXAcwg3awyzWVuBliR qfNSVkNa9U9NKvlS8Bow2wZAbhsQsbZSN4cdLo8hRfqrrtMzYYZQIoopXnUBEk2zQz Xf0u1+TCzYn40ZYpSi7qKoUWBIS+qyysHnWR1FRa4MEYYfe6pmNwUEwisG9Kws3Xgg /EFhB7BgxLhWS3AHVQ+juSfh87FMX7C/wlRiKwg11wDXcpII17HAOzlZoZCLTBzMKo ANFUX6STfpZ3+khbyU3ON6xpYPGHnXClF9LpGoltnjTgdhZofwjDO4cDRE8WY6GRmr HjTFTC96remRA== From: Sasha Levin To: stable@vger.kernel.org Cc: David Howells , Marc Dionne , Jeffrey Altman , Simon Horman , linux-afs@lists.infradead.org, stable@kernel.org, Jakub Kicinski , Sasha Levin Subject: [PATCH 6.12.y] rxrpc: Fix conn-level packet handling to unshare RESPONSE packets Date: Sun, 3 May 2026 10:17:23 -0400 Message-ID: <20260503141723.1081399-1-sashal@kernel.org> X-Mailer: git-send-email 2.53.0 In-Reply-To: <2026050142-gag-tasting-5084@gregkh> References: <2026050142-gag-tasting-5084@gregkh> Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit From: David Howells [ Upstream commit 24481a7f573305706054c59e275371f8d0fe919f ] The security operations that verify the RESPONSE packets decrypt bits of it in place - however, the sk_buff may be shared with a packet sniffer, which would lead to the sniffer seeing an apparently corrupt packet (actually decrypted). Fix this by handing a copy of the packet off to the specific security handler if the packet was cloned. Fixes: 17926a79320a ("[AF_RXRPC]: Provide secure RxRPC sockets for use by userspace and kernel both") Closes: https://sashiko.dev/#/patchset/20260408121252.2249051-1-dhowells%40redhat.com Signed-off-by: David Howells cc: Marc Dionne cc: Jeffrey Altman cc: Simon Horman cc: linux-afs@lists.infradead.org cc: stable@kernel.org Link: https://patch.msgid.link/20260422161438.2593376-5-dhowells@redhat.com Signed-off-by: Jakub Kicinski Signed-off-by: Sasha Levin --- include/trace/events/rxrpc.h | 2 ++ net/rxrpc/conn_event.c | 29 ++++++++++++++++++++++++++++- 2 files changed, 30 insertions(+), 1 deletion(-) diff --git a/include/trace/events/rxrpc.h b/include/trace/events/rxrpc.h index 3eb806f7bc6a5..c5533176d770d 100644 --- a/include/trace/events/rxrpc.h +++ b/include/trace/events/rxrpc.h @@ -146,12 +146,14 @@ EM(rxrpc_skb_put_jumbo_subpacket, "PUT jumbo-sub") \ EM(rxrpc_skb_put_last_nack, "PUT last-nack") \ EM(rxrpc_skb_put_purge, "PUT purge ") \ + EM(rxrpc_skb_put_response_copy, "PUT resp-cpy ") \ EM(rxrpc_skb_put_rotate, "PUT rotate ") \ EM(rxrpc_skb_put_unknown, "PUT unknown ") \ EM(rxrpc_skb_see_conn_work, "SEE conn-work") \ EM(rxrpc_skb_see_recvmsg, "SEE recvmsg ") \ EM(rxrpc_skb_see_reject, "SEE reject ") \ EM(rxrpc_skb_see_rotate, "SEE rotate ") \ + EM(rxrpc_skb_see_unshare_nomem, "SEE unshar-nm") \ E_(rxrpc_skb_see_version, "SEE version ") #define rxrpc_local_traces \ diff --git a/net/rxrpc/conn_event.c b/net/rxrpc/conn_event.c index 6ef2dc1aa8cc2..6d7b064661d88 100644 --- a/net/rxrpc/conn_event.c +++ b/net/rxrpc/conn_event.c @@ -226,6 +226,33 @@ static void rxrpc_call_is_secure(struct rxrpc_call *call) rxrpc_notify_socket(call); } +static int rxrpc_verify_response(struct rxrpc_connection *conn, + struct sk_buff *skb) +{ + int ret; + + if (skb_cloned(skb)) { + /* Copy the packet if shared so that we can do in-place + * decryption. + */ + struct sk_buff *nskb = skb_copy(skb, GFP_NOFS); + + if (nskb) { + rxrpc_new_skb(nskb, rxrpc_skb_new_unshared); + ret = conn->security->verify_response(conn, nskb); + rxrpc_free_skb(nskb, rxrpc_skb_put_response_copy); + } else { + /* OOM - Drop the packet. */ + rxrpc_see_skb(skb, rxrpc_skb_see_unshare_nomem); + ret = -ENOMEM; + } + } else { + ret = conn->security->verify_response(conn, skb); + } + + return ret; +} + /* * connection-level Rx packet processor */ @@ -253,7 +280,7 @@ static int rxrpc_process_event(struct rxrpc_connection *conn, } spin_unlock(&conn->state_lock); - ret = conn->security->verify_response(conn, skb); + ret = rxrpc_verify_response(conn, skb); if (ret < 0) return ret; -- 2.53.0