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/mac80211/tests/util.h | 36 ++++++++++++++++++++++++++++++++++++ 1 file changed, 36 insertions(+) create mode 100644 net/mac80211/tests/util.h (limited to 'net/mac80211/tests/util.h') diff --git a/net/mac80211/tests/util.h b/net/mac80211/tests/util.h new file mode 100644 index 000000000..6615880c1 --- /dev/null +++ b/net/mac80211/tests/util.h @@ -0,0 +1,36 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * Utilities for mac80211 unit testing + * + * Copyright (C) 2024 Intel Corporation + */ +#ifndef __MAC80211_UTILS_H +#define __MAC80211_UTILS_H + +#include "../ieee80211_i.h" + +struct t_sdata { + struct ieee80211_sub_if_data *sdata; + struct wiphy *wiphy; + struct ieee80211_local local; + + void *ctx; + + struct ieee80211_supported_band band_2ghz; + struct ieee80211_supported_band band_5ghz; +}; + +#define T_SDATA(test) ({ \ + struct t_sdata *__t_sdata = \ + kunit_alloc_resource(test, t_sdata_init, \ + t_sdata_exit, \ + GFP_KERNEL, NULL); \ + \ + KUNIT_ASSERT_NOT_NULL(test, __t_sdata); \ + __t_sdata; \ + }) + +int t_sdata_init(struct kunit_resource *resource, void *data); +void t_sdata_exit(struct kunit_resource *resource); + +#endif /* __MAC80211_UTILS_H */ -- cgit v1.3.1