diff options
| author | Leon Hwang <leon.hwang@linux.dev> | 2026-07-30 23:04:08 +0800 |
|---|---|---|
| committer | Steven Rostedt <rostedt@goodmis.org> | 2026-08-08 11:21:04 -0400 |
| commit | 63444b7617c09aeed36282e061c3f80818f2b600 (patch) | |
| tree | 1048c765e892cc8efc015498c7ffa9a9e5ee7463 /kernel | |
| parent | f0ece16ffca7384787b692431961ce202907acf5 (diff) | |
ftrace: Protect direct_functions in ftrace_find_rec_direct
Fix accessing the __rcu pointer direct_functions with RCU protection.
Cc: stable@vger.kernel.org
Link: https://patch.msgid.link/20260730150411.88667-2-leon.hwang@linux.dev
Fixes: d05cb470663a ("ftrace: Fix modification of direct_function hash while in use")
Acked-by: Jiri Olsa <jolsa@kernel.org>
Suggested-by: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Leon Hwang <leon.hwang@linux.dev>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/trace/ftrace.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c index 6c47a94f5924..c5d1d0d42ccc 100644 --- a/kernel/trace/ftrace.c +++ b/kernel/trace/ftrace.c @@ -2645,7 +2645,8 @@ unsigned long ftrace_find_rec_direct(unsigned long ip) { struct ftrace_func_entry *entry; - entry = __ftrace_lookup_ip(direct_functions, ip); + guard(preempt_notrace)(); + entry = __ftrace_lookup_ip(rcu_dereference_sched(direct_functions), ip); if (!entry) return 0; |