[PATCH 4.14 27/46] arm64: hyp-stub: Forbid kprobing of the hyp-stub

Greg Kroah-Hartman
2019-02-04T10:46:18Z

From: James Morse <james.morse@arm.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@arm.com>
Cc: stable@vger.kernel.org
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.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)