Messages in this thread Patch in this message | | | From | Adrian Hunter <> | Subject | [PATCH] ftrace: Fix missing synchronize_rcu() removing trampoline from kallsyms | Date | Tue, 1 Sep 2020 12:16:17 +0300 |
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Add synchronize_rcu() after list_del_rcu() in ftrace_remove_trampoline_from_kallsyms() to protect readers of ftrace_ops_trampoline_list (in ftrace_get_trampoline_kallsym) which is used when kallsyms is read.
Fixes: fc0ea795f53c8d ("ftrace: Add symbols for ftrace trampolines") Signed-off-by: Adrian Hunter <adrian.hunter@intel.com> --- kernel/trace/ftrace.c | 1 + 1 file changed, 1 insertion(+)
diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c index 275441254bb5..4e64367c9774 100644 --- a/kernel/trace/ftrace.c +++ b/kernel/trace/ftrace.c @@ -2782,6 +2782,7 @@ static void ftrace_remove_trampoline_from_kallsyms(struct ftrace_ops *ops) { lockdep_assert_held(&ftrace_lock); list_del_rcu(&ops->list); + synchronize_rcu(); } /* -- 2.17.1
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