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.
Make the unregistration from kmemleak part of marking the sections
as HYP-private. The rest of the HYP-specific data is obtained via
the page allocator, which is not subjected to kmemleak.
Fixes: 90134ac9cabb ("KVM: arm64: Protect the .hyp sections from the host")
Signed-off-by: Marc Zyngier <maz@xxxxxxxxxx>
Cc: Quentin Perret <qperret@xxxxxxxxxx>
Cc: Catalin Marinas <catalin.marinas@xxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx # 5.13
---
arch/arm64/kvm/arm.c | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
diff --git a/arch/arm64/kvm/arm.c b/arch/arm64/kvm/arm.c
index e9a2b8f27792..23f12e602878 100644
--- a/arch/arm64/kvm/arm.c
+++ b/arch/arm64/kvm/arm.c
@@ -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>
@@ -1960,8 +1961,12 @@ static inline int pkvm_mark_hyp(phys_addr_t start, phys_addr_t end)
}
#define pkvm_mark_hyp_section(__section) \
+({ \
+ u64 sz = __section##_end - __section##_start; \
+ kmemleak_free_part(__section##_start, sz); \
pkvm_mark_hyp(__pa_symbol(__section##_start), \
- __pa_symbol(__section##_end))
+ __pa_symbol(__section##_end)); \
+})
static int finalize_hyp_mode(void)
{
--
2.30.2
