ftrace: Setup correct FTRACE_FL_REGS flags for module
commit 8a224ffb upstream. When module loaded and enabled, we will use __ftrace_replace_code for module if any ftrace_ops referenced it found. But we will get wrong ftrace_addr for module rec in ftrace_get_addr_new, because rec->flags has not been setup correctly. It can cause the callback function of a ftrace_ops has FTRACE_OPS_FL_SAVE_REGS to be called with pt_regs set to NULL. So setup correct FTRACE_FL_REGS flags for rec when we call referenced_filters to find ftrace_ops references it. Link: https://lkml.kernel.org/r/20200728180554.65203-1-zhouchengming@bytedance.com Cc: stable@vger.kernel.org Fixes: 8c4f3c3f ("ftrace: Check module functions being traced on reload") Signed-off-by:Chengming Zhou <zhouchengming@bytedance.com> Signed-off-by:
Muchun Song <songmuchun@bytedance.com> Signed-off-by:
Steven Rostedt (VMware) <rostedt@goodmis.org> Signed-off-by:
Paul Gortmaker <paul.gortmaker@windriver.com>
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113ccc66
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