linux-kernel - [PATCH 4.9 17/30] arm64: hyp-stub: Forbid kprobing of the hyp-stub

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Message-Id: <20190204103608.584044775@linuxfoundation.org>
Date:   Mon,  4 Feb 2019 11:36:55 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, James Morse <james.morse@....com>,
        Will Deacon <will.deacon@....com>
Subject: [PATCH 4.9 17/30] arm64: hyp-stub: Forbid kprobing of the hyp-stub

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

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

From: James Morse <james.morse@....com>

commit 8fac5cbdfe0f01254d9d265c6aa1a95f94f58595 upstream.

The hyp-stub is loaded by the kernel's early startup code at EL2
during boot, before KVM takes ownership later. The hyp-stub's
text is part of the regular kernel text, meaning it can be kprobed.

A breakpoint in the hyp-stub causes the CPU to spin in el2_sync_invalid.

Add it to the __hyp_text.

Signed-off-by: James Morse <james.morse@....com>
Cc: stable@...r.kernel.org
Signed-off-by: Will Deacon <will.deacon@....com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 arch/arm64/kernel/hyp-stub.S |    2 ++
 1 file changed, 2 insertions(+)

--- a/arch/arm64/kernel/hyp-stub.S
+++ b/arch/arm64/kernel/hyp-stub.S
@@ -28,6 +28,8 @@
 #include <asm/virt.h>
 
 	.text
+	.pushsection	.hyp.text, "ax"
+
 	.align 11
 
 ENTRY(__hyp_stub_vectors)