Commit 47e6223c authored by Marc Zyngier's avatar Marc Zyngier
Browse files

KVM: arm64: Unregister HYP sections from kmemleak in protected mode 



Booting a KVM host in protected mode with kmemleak quickly results
in a pretty bad crash, as kmemleak doesn't know that the HYP sections
have been taken away. This is specially true for the BSS section,
which is part of the kernel BSS section and registered at boot time
by kmemleak itself.

Unregister the HYP part of the BSS before making that section
HYP-private. The rest of the HYP-specific data is obtained via
the page allocator or lives in other sections, none of which is
subjected to kmemleak.

Fixes: 90134ac9 ("KVM: arm64: Protect the .hyp sections from the host")
Reviewed-by: default avatarQuentin Perret <qperret@google.com>
Reviewed-by: default avatarCatalin Marinas <catalin.marinas@arm.com>
Signed-off-by: default avatarMarc Zyngier <maz@kernel.org>
Cc: stable@vger.kernel.org # 5.13
Link: https://lore.kernel.org/r/20210802123830.2195174-3-maz@kernel.org
parent eb48d154

arch/arm64/kvm/arm.c

+7 −0
Original line number Diff line number Diff line
@@ -15,6 +15,7 @@ 
#include <linux/fs.h>

#include <linux/mman.h>

#include <linux/sched.h>

#include <linux/kmemleak.h>

#include <linux/kvm.h>

#include <linux/kvm_irqfd.h>

#include <linux/irqbypass.h>
@@ -1982,6 +1983,12 @@ static int finalize_hyp_mode(void) 
	if (ret)

		return ret;



	/*

	 * Exclude HYP BSS from kmemleak so that it doesn't get peeked

	 * at, which would end badly once the section is inaccessible.

	 * None of other sections should ever be introspected.

	 */

	kmemleak_free_part(__hyp_bss_start, __hyp_bss_end - __hyp_bss_start);

	ret = pkvm_mark_hyp_section(__hyp_bss);

	if (ret)

		return ret;