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/can/af_can.h | 103 +++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 103 insertions(+) create mode 100644 net/can/af_can.h (limited to 'net/can/af_can.h') diff --git a/net/can/af_can.h b/net/can/af_can.h new file mode 100644 index 000000000..87887014f --- /dev/null +++ b/net/can/af_can.h @@ -0,0 +1,103 @@ +/* SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause) */ +/* Copyright (c) 2002-2007 Volkswagen Group Electronic Research + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. Neither the name of Volkswagen nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * Alternatively, provided that this notice is retained in full, this + * software may be distributed under the terms of the GNU General + * Public License ("GPL") version 2, in which case the provisions of the + * GPL apply INSTEAD OF those given above. + * + * The provided data structures and external interfaces from this code + * are not restricted to be used by modules with a GPL compatible license. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH + * DAMAGE. + * + */ + +#ifndef AF_CAN_H +#define AF_CAN_H + +#include +#include +#include +#include +#include + +/* af_can rx dispatcher structures */ + +struct receiver { + struct hlist_node list; + canid_t can_id; + canid_t mask; + atomic_long_t matches; + void (*func)(struct sk_buff *skb, void *data); + void *data; + char *ident; + struct sock *sk; + struct rcu_head rcu; +}; + +/* statistic structures */ + +/* can be reset e.g. by can_init_stats() */ +struct can_pkg_stats { + unsigned long jiffies_init; + + atomic_long_t rx_frames; + atomic_long_t tx_frames; + atomic_long_t matches; + + unsigned long total_rx_rate; + unsigned long total_tx_rate; + unsigned long total_rx_match_ratio; + + unsigned long current_rx_rate; + unsigned long current_tx_rate; + unsigned long current_rx_match_ratio; + + unsigned long max_rx_rate; + unsigned long max_tx_rate; + unsigned long max_rx_match_ratio; + + atomic_long_t rx_frames_delta; + atomic_long_t tx_frames_delta; + atomic_long_t matches_delta; +}; + +/* persistent statistics */ +struct can_rcv_lists_stats { + unsigned long stats_reset; + unsigned long user_reset; + unsigned long rcv_entries; + unsigned long rcv_entries_max; +}; + +/* function prototypes for the CAN networklayer procfs (proc.c) */ +void can_init_proc(struct net *net); +void can_remove_proc(struct net *net); +void can_stat_update(struct timer_list *t); + +#endif /* AF_CAN_H */ -- cgit v1.3.1