extable: Enable RCU if it is not watching in kernel_text_address() (e8cac8b1) · Commits · 戴 / test

If kernel_text_address() is called when RCU is not watching, it can cause an RCU bug because is_module_text_address(), the is_kprobe_*insn_slot() and is_bpf_text_address() functions require the use of RCU. Only enable RCU if it is not currently watching before it calls is_module_text_address(). The use of rcu_nmi_enter() is used to enable RCU because kernel_text_address() can happen pretty much anywhere (like an NMI), and even from within an NMI. It is called via save_stack_trace() that can be called by any WARN() or tracing function, which can happen while RCU is not watching (for example, going to or coming from idle, or during CPU take down or bring up). Cc: stable@vger.kernel.org Fixes: ("module: Sanitize RCU usage and locking") Acked-by:

Paul E. McKenney <paulmck@linux.vnet.ibm.com> Signed-off-by:

Steven Rostedt (VMware) <rostedt@goodmis.org>

kernel/extable.c

+30 −5

Original line number	Diff line number	Diff line
		@@ -119,17 +119,42 @@ int __kernel_text_address(unsigned long addr)

		int kernel_text_address(unsigned long addr)
		{
		bool no_rcu;
		int ret = 1;

		if (core_kernel_text(addr))
		return 1;

		/*
		* If a stack dump happens while RCU is not watching, then
		* RCU needs to be notified that it requires to start
		* watching again. This can happen either by tracing that
		* triggers a stack trace, or a WARN() that happens during
		* coming back from idle, or cpu on or offlining.
		*
		* is_module_text_address() as well as the kprobe slots
		* and is_bpf_text_address() require RCU to be watching.
		*/
		no_rcu = !rcu_is_watching();

		/* Treat this like an NMI as it can happen anywhere */
		if (no_rcu)
		rcu_nmi_enter();

		if (is_module_text_address(addr))
		return 1;
		goto out;
		if (is_ftrace_trampoline(addr))
		return 1;
		goto out;
		if (is_kprobe_optinsn_slot(addr) \|\| is_kprobe_insn_slot(addr))
		return 1;
		goto out;
		if (is_bpf_text_address(addr))
		return 1;
		return 0;
		goto out;
		ret = 0;
		out:
		if (no_rcu)
		rcu_nmi_exit();

		return ret;
		}

		/*

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