From: Mark Rutland <mark.rutland@arm.com>
To: Marc Zyngier <marc.zyngier@arm.com>
Cc: Christoffer Dall <christoffer.dall@linaro.org>,
Catalin Marinas <catalin.marinas@arm.com>,
Will Deacon <will.deacon@arm.com>,
Russell King <linux@armlinux.org.uk>,
linux-arm-kernel@lists.infradead.org, kvm@vger.kernel.org,
kvmarm@lists.cs.columbia.edu
Subject: Re: [PATCH 5/5] arm/arm64: KVM: Make default HYP mappings non-excutable
Date: Mon, 13 Jun 2016 16:29:12 +0100 [thread overview]
Message-ID: <20160613152911.GC29783@leverpostej> (raw)
In-Reply-To: <1465826449-14349-6-git-send-email-marc.zyngier@arm.com>
Hi,
Nit: typo in subject "excutable" is missing an 'e'.
Mark.
On Mon, Jun 13, 2016 at 03:00:49PM +0100, Marc Zyngier wrote:
> Structures that can be generally written to don't have any requirement
> to be executable (quite the opposite). This includes the kvm and vcpu
> structures, as well as the stacks.
>
> Let's change the default to incorporate the XN flag.
>
> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
> ---
> arch/arm/include/asm/pgtable.h | 2 +-
> arch/arm64/include/asm/pgtable-prot.h | 2 +-
> 2 files changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/arch/arm/include/asm/pgtable.h b/arch/arm/include/asm/pgtable.h
> index 7487bf9..e0d76ba 100644
> --- a/arch/arm/include/asm/pgtable.h
> +++ b/arch/arm/include/asm/pgtable.h
> @@ -97,7 +97,7 @@ extern pgprot_t pgprot_s2_device;
> #define PAGE_READONLY_EXEC _MOD_PROT(pgprot_user, L_PTE_USER | L_PTE_RDONLY)
> #define PAGE_KERNEL _MOD_PROT(pgprot_kernel, L_PTE_XN)
> #define PAGE_KERNEL_EXEC pgprot_kernel
> -#define PAGE_HYP _MOD_PROT(pgprot_kernel, L_PTE_HYP)
> +#define PAGE_HYP _MOD_PROT(pgprot_kernel, L_PTE_HYP | L_PTE_XN)
> #define PAGE_HYP_EXEC _MOD_PROT(pgprot_kernel, L_PTE_HYP | L_PTE_RDONLY)
> #define PAGE_HYP_RO _MOD_PROT(pgprot_kernel, L_PTE_HYP | L_PTE_RDONLY | L_PTE_XN)
> #define PAGE_HYP_DEVICE _MOD_PROT(pgprot_hyp_device, L_PTE_HYP)
> diff --git a/arch/arm64/include/asm/pgtable-prot.h b/arch/arm64/include/asm/pgtable-prot.h
> index 3802048..39f5252 100644
> --- a/arch/arm64/include/asm/pgtable-prot.h
> +++ b/arch/arm64/include/asm/pgtable-prot.h
> @@ -55,7 +55,7 @@
> #define PAGE_KERNEL_EXEC __pgprot(_PAGE_DEFAULT | PTE_UXN | PTE_DIRTY | PTE_WRITE)
> #define PAGE_KERNEL_EXEC_CONT __pgprot(_PAGE_DEFAULT | PTE_UXN | PTE_DIRTY | PTE_WRITE | PTE_CONT)
>
> -#define PAGE_HYP __pgprot(_PAGE_DEFAULT | PTE_HYP)
> +#define PAGE_HYP __pgprot(_PAGE_DEFAULT | PTE_HYP | PTE_HYP_XN)
> #define PAGE_HYP_EXEC __pgprot(_PAGE_DEFAULT | PTE_HYP | PTE_RDONLY)
> #define PAGE_HYP_RO __pgprot(_PAGE_DEFAULT | PTE_HYP | PTE_RDONLY | PTE_HYP_XN)
> #define PAGE_HYP_DEVICE __pgprot(PROT_DEVICE_nGnRE | PTE_HYP)
> --
> 2.1.4
>
next prev parent reply other threads:[~2016-06-13 15:29 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-06-13 14:00 [PATCH 0/5] arm/arm64: KVM: Tighten memory protection flags Marc Zyngier
2016-06-13 14:00 ` [PATCH 1/5] arm/arm64: KVM: Add a protection parameter to create_hyp_mappings Marc Zyngier
2016-06-13 14:00 ` [PATCH 2/5] arm64: Add PTE_HYP_XN page table flag Marc Zyngier
2016-06-13 14:00 ` [PATCH 3/5] arm/arm64: KVM: Enforce HYP read-only mapping of the kernel's rodata section Marc Zyngier
2016-06-13 14:00 ` [PATCH 4/5] arm/arm64: KVM: Map the HYP text as read-only Marc Zyngier
2016-06-13 15:02 ` Mark Rutland
2016-06-13 15:16 ` Marc Zyngier
2016-06-13 15:30 ` Mark Rutland
2016-06-13 14:00 ` [PATCH 5/5] arm/arm64: KVM: Make default HYP mappings non-excutable Marc Zyngier
2016-06-13 15:29 ` Mark Rutland [this message]
2016-06-15 14:51 ` [PATCH 0/5] arm/arm64: KVM: Tighten memory protection flags Will Deacon
2016-06-29 12:21 ` Christoffer Dall
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