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 --- rust/helpers/task.c | 57 +++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 57 insertions(+) create mode 100644 rust/helpers/task.c (limited to 'rust/helpers/task.c') diff --git a/rust/helpers/task.c b/rust/helpers/task.c new file mode 100644 index 000000000..b46b1433a --- /dev/null +++ b/rust/helpers/task.c @@ -0,0 +1,57 @@ +// SPDX-License-Identifier: GPL-2.0 + +#include +#include + +__rust_helper void rust_helper_might_resched(void) +{ + might_resched(); +} + +__rust_helper struct task_struct *rust_helper_get_current(void) +{ + return current; +} + +__rust_helper void rust_helper_get_task_struct(struct task_struct *t) +{ + get_task_struct(t); +} + +__rust_helper void rust_helper_put_task_struct(struct task_struct *t) +{ + put_task_struct(t); +} + +__rust_helper kuid_t rust_helper_task_uid(struct task_struct *task) +{ + return task_uid(task); +} + +#ifndef CONFIG_USER_NS +__rust_helper uid_t rust_helper_from_kuid(struct user_namespace *to, kuid_t uid) +{ + return from_kuid(to, uid); +} +#endif /* CONFIG_USER_NS */ + +__rust_helper bool rust_helper_uid_eq(kuid_t left, kuid_t right) +{ + return uid_eq(left, right); +} + +__rust_helper kuid_t rust_helper_current_euid(void) +{ + return current_euid(); +} + +__rust_helper struct user_namespace *rust_helper_current_user_ns(void) +{ + return current_user_ns(); +} + +__rust_helper pid_t rust_helper_task_tgid_nr_ns(struct task_struct *tsk, + struct pid_namespace *ns) +{ + return task_tgid_nr_ns(tsk, ns); +} -- cgit v1.3.1