Sami Tolvanen 57cd6d157e cfi: Fix __cfi_slowpath_diag RCU usage with cpuidle ... RCU_NONIDLE usage during __cfi_slowpath_diag can result in an invalid RCU state in the cpuidle code path: WARNING: CPU: 1 PID: 0 at kernel/rcu/tree.c:613 rcu_eqs_enter+0xe4/0x138 ... Call trace: rcu_eqs_enter+0xe4/0x138 rcu_idle_enter+0xa8/0x100 cpuidle_enter_state+0x154/0x3a8 cpuidle_enter+0x3c/0x58 do_idle.llvm.6590768638138871020+0x1f4/0x2ec cpu_startup_entry+0x28/0x2c secondary_start_kernel+0x1b8/0x220 __secondary_switched+0x94/0x98 Instead, call rcu_irq_enter/exit to wake up RCU only when needed and disable interrupts for the entire CFI shadow/module check when we do. Signed-off-by: Sami Tolvanen <samitolvanen@google.com> Link: https://lore.kernel.org/r/20220531175910.890307-1-samitolvanen@google.com Fixes: cf68fffb66 ("add support for Clang CFI") Cc: stable@vger.kernel.org Signed-off-by: Kees Cook <keescook@chromium.org>		2022-06-13 09:18:46 -07:00
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cfi.c	cfi: Fix __cfi_slowpath_diag RCU usage with cpuidle	2022-06-13 09:18:46 -07:00
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