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tracing: Hold trace_types_lock when updating modules in persistent instances

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trace_module_record() walks ftrace_trace_arrays from the module notifier
without trace_types_lock. A concurrent rmdir of an instance removes it
from the list and frees it under that lock, so a module load or unload
can walk into a freed trace_array.

Cc: stable@vger.kernel.org
Fixes: 5f3719f697 ("tracing: Update modules to persistent instances when loaded")
Link: https://patch.msgid.link/20261016061638.214847-1-devnexen@gmail.com
Signed-off-by: David Carlier <devnexen@gmail.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
This commit is contained in:
David Carlier 2026-10-16 07:16:34 +01:00 committed by Steven Rostedt
parent 097fd00500
commit 66877a312a
1 changed files with 2 additions and 0 deletions
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2
kernel/trace/trace.c
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@ -9244,6 +9244,8 @@ static void trace_module_record(struct module *mod, bool add)
struct trace_array *tr;
unsigned long flags;
guard(mutex)(&trace_types_lock);
list_for_each_entry(tr, &ftrace_trace_arrays, list) {
flags = tr->flags & (TRACE_ARRAY_FL_BOOT | TRACE_ARRAY_FL_LAST_BOOT);
/* Update any persistent trace array that has already been started */