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arm64: hyp-stub: Forbid kprobing of the hyp-stub

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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>
This commit is contained in:
James Morse 2019-01-24 16:32:56 +00:00 committed by Greg Kroah-Hartman
parent 1472585f51
commit 7685bb0efb
1 changed files with 2 additions and 0 deletions
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2
arch/arm64/kernel/hyp-stub.S
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@ -26,6 +26,8 @@
#include <asm/virt.h>
.text
.pushsection .hyp.text, "ax"
.align 11
ENTRY(__hyp_stub_vectors)