linux-kernel - [PATCH 4.9 30/87] ARM: 8770/1: kprobes: Prohibit probing on optimized

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Message-Id: <20180521210423.134228297@linuxfoundation.org>
Date:   Mon, 21 May 2018 23:11:06 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Masami Hiramatsu <mhiramat@...nel.org>,
        Russell King <rmk+kernel@...linux.org.uk>
Subject: [PATCH 4.9 30/87] ARM: 8770/1: kprobes: Prohibit probing on optimized_callback

4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Masami Hiramatsu <mhiramat@...nel.org>

commit 70948c05fdde0aac32f9667856a88725c192fa40 upstream.

Prohibit probing on optimized_callback() because
it is called from kprobes itself. If we put a kprobes
on it, that will cause a recursive call loop.
Mark it NOKPROBE_SYMBOL.

Fixes: 0dc016dbd820 ("ARM: kprobes: enable OPTPROBES for ARM 32")
Signed-off-by: Masami Hiramatsu <mhiramat@...nel.org>
Cc: stable@...r.kernel.org
Signed-off-by: Russell King <rmk+kernel@...linux.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 arch/arm/probes/kprobes/opt-arm.c |    1 +
 1 file changed, 1 insertion(+)

--- a/arch/arm/probes/kprobes/opt-arm.c
+++ b/arch/arm/probes/kprobes/opt-arm.c
@@ -192,6 +192,7 @@ optimized_callback(struct optimized_kpro
 
 	local_irq_restore(flags);
 }
+NOKPROBE_SYMBOL(optimized_callback)
 
 int arch_prepare_optimized_kprobe(struct optimized_kprobe *op, struct kprobe *orig)
 {