[PATCH] KVM: arm64: vgic: Handle const qualifier from clusters allocation type

[PATCH] KVM: arm64: vgic: Handle const qualifier from clusters allocation type

[Kees Cook]

In preparation for making the kmalloc family of allocators type aware,
we need to make sure that the returned type from the allocation matches
the type of the variable being assigned. (Before, the allocator would
always return "void *", which can be implicitly cast to any pointer type.)

The assigned type is "struct gic_kvm_info", but the returned type,
while matching, is const qualified. To get them exactly matching, just
use the dereferenced pointer for the sizeof().

Signed-off-by: Kees Cook <kees@kernel.org>
---
Cc: Marc Zyngier <maz@kernel.org>
Cc: Oliver Upton <oupton@kernel.org>
Cc: Joey Gouly <joey.gouly@arm.com>
Cc: Suzuki K Poulose <suzuki.poulose@arm.com>
Cc: Zenghui Yu <yuzenghui@huawei.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will@kernel.org>
Cc: Alexander Potapenko <glider@google.com>
Cc: <linux-arm-kernel@lists.infradead.org>
Cc: <kvmarm@lists.linux.dev>
---
 arch/arm64/kvm/vgic/vgic-init.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm64/kvm/vgic/vgic-init.c b/arch/arm64/kvm/vgic/vgic-init.c
index 86c149537493..a53f93546aa0 100644
--- a/arch/arm64/kvm/vgic/vgic-init.c
+++ b/arch/arm64/kvm/vgic/vgic-init.c
@@ -654,7 +654,7 @@ static struct gic_kvm_info *gic_kvm_info;
 void __init vgic_set_kvm_info(const struct gic_kvm_info *info)
 {
 	BUG_ON(gic_kvm_info != NULL);
-	gic_kvm_info = kmalloc(sizeof(*info), GFP_KERNEL);
+	gic_kvm_info = kmalloc(sizeof(*gic_kvm_info), GFP_KERNEL);
 	if (gic_kvm_info)
 		*gic_kvm_info = *info;
 }
-- 
2.34.1

Re: [PATCH] KVM: arm64: vgic: Handle const qualifier from clusters allocation type

[Kees Cook]

Oops, bad Subject... sending v2

On Fri, Feb 06, 2026 at 02:26:53PM -0800, Kees Cook wrote:
> In preparation for making the kmalloc family of allocators type aware,
> we need to make sure that the returned type from the allocation matches
> the type of the variable being assigned. (Before, the allocator would
> always return "void *", which can be implicitly cast to any pointer type.)
> 
> The assigned type is "struct gic_kvm_info", but the returned type,
> while matching, is const qualified. To get them exactly matching, just
> use the dereferenced pointer for the sizeof().
> 
> Signed-off-by: Kees Cook <kees@kernel.org>
> ---
> Cc: Marc Zyngier <maz@kernel.org>
> Cc: Oliver Upton <oupton@kernel.org>
> Cc: Joey Gouly <joey.gouly@arm.com>
> Cc: Suzuki K Poulose <suzuki.poulose@arm.com>
> Cc: Zenghui Yu <yuzenghui@huawei.com>
> Cc: Catalin Marinas <catalin.marinas@arm.com>
> Cc: Will Deacon <will@kernel.org>
> Cc: Alexander Potapenko <glider@google.com>
> Cc: <linux-arm-kernel@lists.infradead.org>
> Cc: <kvmarm@lists.linux.dev>
> ---
>  arch/arm64/kvm/vgic/vgic-init.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/arch/arm64/kvm/vgic/vgic-init.c b/arch/arm64/kvm/vgic/vgic-init.c
> index 86c149537493..a53f93546aa0 100644
> --- a/arch/arm64/kvm/vgic/vgic-init.c
> +++ b/arch/arm64/kvm/vgic/vgic-init.c
> @@ -654,7 +654,7 @@ static struct gic_kvm_info *gic_kvm_info;
>  void __init vgic_set_kvm_info(const struct gic_kvm_info *info)
>  {
>  	BUG_ON(gic_kvm_info != NULL);
> -	gic_kvm_info = kmalloc(sizeof(*info), GFP_KERNEL);
> +	gic_kvm_info = kmalloc(sizeof(*gic_kvm_info), GFP_KERNEL);
>  	if (gic_kvm_info)
>  		*gic_kvm_info = *info;
>  }
> -- 
> 2.34.1
> 

-- 
Kees Cook