From 4617721c502b2ddaa4e324e86da4997edf738fa5 Mon Sep 17 00:00:00 2001 From: Steven Rostedt Date: Wed, 2 Sep 2026 09:55:01 -0400 Subject: ftrace: Synchronize the initialization of ftrace_ops There's some internal state that ftrace_ops needs to have set, but since it can be declared outside of the ftrace.c code, it calls ftrace_ops_init() on the ops in every global function. The issue is that if two tasks call it on the same ops at the same time it is possible to have the initialization of one corrupt the initialization of the other call. Create a ops_mutex to use to synchronize every initialization of the ftrace_ops. The mutex is taken within checking the ftrace_ops flag that states it was initializied but the flag is checked again after the mutex has been taken. Checking first outside the mutex allows it to shortcut having to take the mutex. But then the check needs to be done again after the mute is taken in case of races. Cc: stable@vger.kernel.org Link: https://patch.msgid.link/20260902095501.6b59af20@gandalf.local.home Fixes: f04f24fb7e48d ("ftrace, kprobes: Fix a deadlock on ftrace_regex_lock") Reported-by: sashiko-bot@kernel.org Close: https://lore.kernel.org/all/20260829025528.49A831F000E9@smtp.kernel.org/ Signed-off-by: Steven Rostedt --- net/rxrpc/insecure.c | 94 ++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 94 insertions(+) create mode 100644 net/rxrpc/insecure.c (limited to 'net/rxrpc/insecure.c') diff --git a/net/rxrpc/insecure.c b/net/rxrpc/insecure.c new file mode 100644 index 000000000..0b39046bd --- /dev/null +++ b/net/rxrpc/insecure.c @@ -0,0 +1,94 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* Null security operations. + * + * Copyright (C) 2016 Red Hat, Inc. All Rights Reserved. + * Written by David Howells (dhowells@redhat.com) + */ + +#include +#include "ar-internal.h" + +static int none_init_connection_security(struct rxrpc_connection *conn, + struct rxrpc_key_token *token) +{ + return 0; +} + +/* + * Allocate an appropriately sized buffer for the amount of data remaining. + */ +static struct rxrpc_txbuf *none_alloc_txbuf(struct rxrpc_call *call, size_t remain, gfp_t gfp) +{ + return rxrpc_alloc_data_txbuf(call, umin(remain, RXRPC_JUMBO_DATALEN), 1, gfp); +} + +static int none_secure_packet(struct rxrpc_call *call, struct rxrpc_txbuf *txb) +{ + txb->pkt_len = txb->len; + if (txb->len == RXRPC_JUMBO_DATALEN) + txb->jumboable = true; + return 0; +} + +static int none_verify_packet(struct rxrpc_call *call, struct sk_buff *skb) +{ + return 0; +} + +static void none_free_call_crypto(struct rxrpc_call *call) +{ +} + +static bool none_validate_challenge(struct rxrpc_connection *conn, + struct sk_buff *skb) +{ + rxrpc_abort_conn(conn, skb, RX_PROTOCOL_ERROR, -EPROTO, + rxrpc_eproto_rxnull_challenge); + return true; +} + +static int none_sendmsg_respond_to_challenge(struct sk_buff *challenge, + struct msghdr *msg) +{ + return -EINVAL; +} + +static int none_verify_response(struct rxrpc_connection *conn, + struct sk_buff *response_skb, + void *response, unsigned int len) +{ + return rxrpc_abort_conn(conn, response_skb, RX_PROTOCOL_ERROR, -EPROTO, + rxrpc_eproto_rxnull_response); +} + +static void none_clear(struct rxrpc_connection *conn) +{ +} + +static int none_init(void) +{ + return 0; +} + +static void none_exit(void) +{ +} + +/* + * RxRPC Kerberos-based security + */ +const struct rxrpc_security rxrpc_no_security = { + .name = "none", + .security_index = RXRPC_SECURITY_NONE, + .init = none_init, + .exit = none_exit, + .init_connection_security = none_init_connection_security, + .free_call_crypto = none_free_call_crypto, + .alloc_txbuf = none_alloc_txbuf, + .secure_packet = none_secure_packet, + .verify_packet = none_verify_packet, + .validate_challenge = none_validate_challenge, + .sendmsg_respond_to_challenge = none_sendmsg_respond_to_challenge, + .verify_response = none_verify_response, + .clear = none_clear, +}; -- cgit v1.3.1