From: Christoph Hellwig <hch@lst.de> To: Andrew Morton <akpm@linux-foundation.org> Cc: Dexuan Cui <decui@microsoft.com>, Vitaly Kuznetsov <vkuznets@redhat.com>, Peter Zijlstra <peterz@infradead.org>, Catalin Marinas <catalin.marinas@arm.com>, Will Deacon <will@kernel.org>, Jessica Yu <jeyu@kernel.org>, x86@kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-hyperv@vger.kernel.org, linux-mm@kvack.org Subject: [PATCH 1/3] x86/hyperv: allocate the hypercall page with only read and execute bits Date: Thu, 18 Jun 2020 08:43:05 +0200 [thread overview] Message-ID: <20200618064307.32739-2-hch@lst.de> (raw) In-Reply-To: <20200618064307.32739-1-hch@lst.de> Avoid a W^X violation cause by the fact that PAGE_KERNEL_EXEC includes the writable bit. For this resurrect the removed PAGE_KERNEL_RX definitіon, but as PAGE_KERNEL_ROX to match arm64 and powerpc. Fixes: 78bb17f76edc ("x86/hyperv: use vmalloc_exec for the hypercall page") Reported-by: Dexuan Cui <decui@microsoft.com> Signed-off-by: Christoph Hellwig <hch@lst.de> Tested-by: Vitaly Kuznetsov <vkuznets@redhat.com> --- arch/x86/hyperv/hv_init.c | 4 +++- arch/x86/include/asm/pgtable_types.h | 2 ++ 2 files changed, 5 insertions(+), 1 deletion(-) diff --git a/arch/x86/hyperv/hv_init.c b/arch/x86/hyperv/hv_init.c index a54c6a401581dd..2bdc72e6890eca 100644 --- a/arch/x86/hyperv/hv_init.c +++ b/arch/x86/hyperv/hv_init.c @@ -375,7 +375,9 @@ void __init hyperv_init(void) guest_id = generate_guest_id(0, LINUX_VERSION_CODE, 0); wrmsrl(HV_X64_MSR_GUEST_OS_ID, guest_id); - hv_hypercall_pg = vmalloc_exec(PAGE_SIZE); + hv_hypercall_pg = __vmalloc_node_range(PAGE_SIZE, 1, VMALLOC_START, + VMALLOC_END, GFP_KERNEL, PAGE_KERNEL_ROX, + VM_FLUSH_RESET_PERMS, NUMA_NO_NODE, __func__); if (hv_hypercall_pg == NULL) { wrmsrl(HV_X64_MSR_GUEST_OS_ID, 0); goto remove_cpuhp_state; diff --git a/arch/x86/include/asm/pgtable_types.h b/arch/x86/include/asm/pgtable_types.h index 2da1f95b88d761..816b31c685505f 100644 --- a/arch/x86/include/asm/pgtable_types.h +++ b/arch/x86/include/asm/pgtable_types.h @@ -194,6 +194,7 @@ enum page_cache_mode { #define _PAGE_TABLE_NOENC (__PP|__RW|_USR|___A| 0|___D| 0| 0) #define _PAGE_TABLE (__PP|__RW|_USR|___A| 0|___D| 0| 0| _ENC) #define __PAGE_KERNEL_RO (__PP| 0| 0|___A|__NX|___D| 0|___G) +#define __PAGE_KERNEL_ROX (__PP| 0| 0|___A| 0|___D| 0|___G) #define __PAGE_KERNEL_NOCACHE (__PP|__RW| 0|___A|__NX|___D| 0|___G| __NC) #define __PAGE_KERNEL_VVAR (__PP| 0|_USR|___A|__NX|___D| 0|___G) #define __PAGE_KERNEL_LARGE (__PP|__RW| 0|___A|__NX|___D|_PSE|___G) @@ -219,6 +220,7 @@ enum page_cache_mode { #define PAGE_KERNEL_RO __pgprot_mask(__PAGE_KERNEL_RO | _ENC) #define PAGE_KERNEL_EXEC __pgprot_mask(__PAGE_KERNEL_EXEC | _ENC) #define PAGE_KERNEL_EXEC_NOENC __pgprot_mask(__PAGE_KERNEL_EXEC | 0) +#define PAGE_KERNEL_ROX __pgprot_mask(__PAGE_KERNEL_ROX | _ENC) #define PAGE_KERNEL_NOCACHE __pgprot_mask(__PAGE_KERNEL_NOCACHE | _ENC) #define PAGE_KERNEL_LARGE __pgprot_mask(__PAGE_KERNEL_LARGE | _ENC) #define PAGE_KERNEL_LARGE_EXEC __pgprot_mask(__PAGE_KERNEL_LARGE_EXEC | _ENC) -- 2.26.2
WARNING: multiple messages have this Message-ID (diff)
From: Christoph Hellwig <hch@lst.de> To: Andrew Morton <akpm@linux-foundation.org> Cc: linux-hyperv@vger.kernel.org, Peter Zijlstra <peterz@infradead.org>, Catalin Marinas <catalin.marinas@arm.com>, x86@kernel.org, Dexuan Cui <decui@microsoft.com>, linux-kernel@vger.kernel.org, linux-mm@kvack.org, Jessica Yu <jeyu@kernel.org>, Vitaly Kuznetsov <vkuznets@redhat.com>, Will Deacon <will@kernel.org>, linux-arm-kernel@lists.infradead.org Subject: [PATCH 1/3] x86/hyperv: allocate the hypercall page with only read and execute bits Date: Thu, 18 Jun 2020 08:43:05 +0200 [thread overview] Message-ID: <20200618064307.32739-2-hch@lst.de> (raw) In-Reply-To: <20200618064307.32739-1-hch@lst.de> Avoid a W^X violation cause by the fact that PAGE_KERNEL_EXEC includes the writable bit. For this resurrect the removed PAGE_KERNEL_RX definitіon, but as PAGE_KERNEL_ROX to match arm64 and powerpc. Fixes: 78bb17f76edc ("x86/hyperv: use vmalloc_exec for the hypercall page") Reported-by: Dexuan Cui <decui@microsoft.com> Signed-off-by: Christoph Hellwig <hch@lst.de> Tested-by: Vitaly Kuznetsov <vkuznets@redhat.com> --- arch/x86/hyperv/hv_init.c | 4 +++- arch/x86/include/asm/pgtable_types.h | 2 ++ 2 files changed, 5 insertions(+), 1 deletion(-) diff --git a/arch/x86/hyperv/hv_init.c b/arch/x86/hyperv/hv_init.c index a54c6a401581dd..2bdc72e6890eca 100644 --- a/arch/x86/hyperv/hv_init.c +++ b/arch/x86/hyperv/hv_init.c @@ -375,7 +375,9 @@ void __init hyperv_init(void) guest_id = generate_guest_id(0, LINUX_VERSION_CODE, 0); wrmsrl(HV_X64_MSR_GUEST_OS_ID, guest_id); - hv_hypercall_pg = vmalloc_exec(PAGE_SIZE); + hv_hypercall_pg = __vmalloc_node_range(PAGE_SIZE, 1, VMALLOC_START, + VMALLOC_END, GFP_KERNEL, PAGE_KERNEL_ROX, + VM_FLUSH_RESET_PERMS, NUMA_NO_NODE, __func__); if (hv_hypercall_pg == NULL) { wrmsrl(HV_X64_MSR_GUEST_OS_ID, 0); goto remove_cpuhp_state; diff --git a/arch/x86/include/asm/pgtable_types.h b/arch/x86/include/asm/pgtable_types.h index 2da1f95b88d761..816b31c685505f 100644 --- a/arch/x86/include/asm/pgtable_types.h +++ b/arch/x86/include/asm/pgtable_types.h @@ -194,6 +194,7 @@ enum page_cache_mode { #define _PAGE_TABLE_NOENC (__PP|__RW|_USR|___A| 0|___D| 0| 0) #define _PAGE_TABLE (__PP|__RW|_USR|___A| 0|___D| 0| 0| _ENC) #define __PAGE_KERNEL_RO (__PP| 0| 0|___A|__NX|___D| 0|___G) +#define __PAGE_KERNEL_ROX (__PP| 0| 0|___A| 0|___D| 0|___G) #define __PAGE_KERNEL_NOCACHE (__PP|__RW| 0|___A|__NX|___D| 0|___G| __NC) #define __PAGE_KERNEL_VVAR (__PP| 0|_USR|___A|__NX|___D| 0|___G) #define __PAGE_KERNEL_LARGE (__PP|__RW| 0|___A|__NX|___D|_PSE|___G) @@ -219,6 +220,7 @@ enum page_cache_mode { #define PAGE_KERNEL_RO __pgprot_mask(__PAGE_KERNEL_RO | _ENC) #define PAGE_KERNEL_EXEC __pgprot_mask(__PAGE_KERNEL_EXEC | _ENC) #define PAGE_KERNEL_EXEC_NOENC __pgprot_mask(__PAGE_KERNEL_EXEC | 0) +#define PAGE_KERNEL_ROX __pgprot_mask(__PAGE_KERNEL_ROX | _ENC) #define PAGE_KERNEL_NOCACHE __pgprot_mask(__PAGE_KERNEL_NOCACHE | _ENC) #define PAGE_KERNEL_LARGE __pgprot_mask(__PAGE_KERNEL_LARGE | _ENC) #define PAGE_KERNEL_LARGE_EXEC __pgprot_mask(__PAGE_KERNEL_LARGE_EXEC | _ENC) -- 2.26.2 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next prev parent reply other threads:[~2020-06-18 6:43 UTC|newest] Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top 2020-06-18 6:43 fix a hyperv W^X violation and remove vmalloc_exec Christoph Hellwig 2020-06-18 6:43 ` Christoph Hellwig 2020-06-18 6:43 ` Christoph Hellwig [this message] 2020-06-18 6:43 ` [PATCH 1/3] x86/hyperv: allocate the hypercall page with only read and execute bits Christoph Hellwig 2020-06-18 11:47 ` Wei Liu 2020-06-18 11:47 ` Wei Liu 2020-06-18 6:43 ` [PATCH 2/3] arm64: use PAGE_KERNEL_ROX directly in alloc_insn_page Christoph Hellwig 2020-06-18 6:43 ` Christoph Hellwig 2020-06-18 8:55 ` David Hildenbrand 2020-06-18 8:55 ` David Hildenbrand 2020-06-18 10:35 ` Peter Zijlstra 2020-06-18 10:35 ` Peter Zijlstra 2020-06-18 13:50 ` Christoph Hellwig 2020-06-18 13:50 ` Christoph Hellwig 2020-06-18 9:27 ` Peter Zijlstra 2020-06-18 9:27 ` Peter Zijlstra 2020-06-21 2:16 ` Andrew Morton 2020-06-23 9:05 ` Christoph Hellwig 2020-06-23 9:07 ` Will Deacon 2020-06-23 9:37 ` Peter Zijlstra 2020-06-23 9:57 ` Will Deacon 2020-06-27 7:34 ` Ard Biesheuvel 2020-06-27 7:34 ` Ard Biesheuvel 2020-06-27 7:34 ` Ard Biesheuvel 2020-06-27 7:56 ` Christoph Hellwig 2020-06-27 7:56 ` Christoph Hellwig 2020-06-27 7:57 ` Ard Biesheuvel 2020-06-27 7:57 ` Ard Biesheuvel 2020-06-27 7:57 ` Ard Biesheuvel 2020-06-18 6:43 ` [PATCH 3/3] mm: remove vmalloc_exec Christoph Hellwig 2020-06-18 6:43 ` Christoph Hellwig 2020-06-18 8:53 ` David Hildenbrand 2020-06-18 8:53 ` David Hildenbrand 2020-06-18 9:28 ` fix a hyperv W^X violation and " Peter Zijlstra 2020-06-18 9:28 ` Peter Zijlstra
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