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authorAdrian Hunter <adrian.hunter@intel.com>2020-09-01 12:16:17 +0300
committerSteven Rostedt (VMware) <rostedt@goodmis.org>2020-09-18 12:22:42 -0400
commit478ece9573f04aed834e05e0bbf034320d240f9f (patch)
tree19a62f01936d1b44e27ae1fb978705f930522d97
parentd5e47505e02666d5b3fe99212e0100791847dc8d (diff)
ftrace: Fix missing synchronize_rcu() removing trampoline from kallsyms
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. Link: https://lkml.kernel.org/r/20200901091617.31837-1-adrian.hunter@intel.com Fixes: fc0ea795f53c8d ("ftrace: Add symbols for ftrace trampolines") Signed-off-by: Adrian Hunter <adrian.hunter@intel.com> Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
-rw-r--r--kernel/trace/ftrace.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
index 656d7cb5a78c..e9f893388245 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();
}
/*