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cfi: Use rcu_read_{un}lock_sched_notrace
If rcu_read_lock_sched tracing is enabled, the tracing subsystem can perform a jump which needs to be checked by CFI. For example, stm_ftrace source is enabled as a module and hooks into enabled ftrace events. This can cause an recursive loop where find_shadow_check_fn -> rcu_read_lock_sched -> (call to stm_ftrace generates cfi slowpath) -> find_shadow_check_fn -> rcu_read_lock_sched -> ... To avoid the recursion, either the ftrace codes needs to be marked with __no_cfi or CFI should not trace. Use the "_notrace" in CFI to avoid tracing so that CFI can guard ftrace. Signed-off-by: Elliot Berman <[email protected]> Reviewed-by: Sami Tolvanen <[email protected]> Cc: [email protected] Fixes: cf68fff ("add support for Clang CFI") Signed-off-by: Kees Cook <[email protected]> Link: https://lore.kernel.org/r/[email protected]
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