linux-kernel - [PATCH 28/34] x86: wire up mprotect

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Message-Id: <20151204011503.2A095839@viggo.jf.intel.com>
Date:	Thu, 03 Dec 2015 17:15:03 -0800
From:	Dave Hansen <dave@...1.net>
To:	linux-kernel@...r.kernel.org
Cc:	linux-mm@...ck.org, x86@...nel.org, Dave Hansen <dave@...1.net>,
	dave.hansen@...ux.intel.com, linux-api@...r.kernel.org
Subject: [PATCH 28/34] x86: wire up mprotect_key() system call


From: Dave Hansen <dave.hansen@...ux.intel.com>

This is all that we need to get the new system call itself
working on x86.

Signed-off-by: Dave Hansen <dave.hansen@...ux.intel.com>
Cc: linux-api@...r.kernel.org
---

 b/arch/x86/entry/syscalls/syscall_32.tbl |    1 +
 b/arch/x86/entry/syscalls/syscall_64.tbl |    1 +
 b/arch/x86/include/uapi/asm/mman.h       |    6 ++++++
 b/mm/Kconfig                             |    1 +
 4 files changed, 9 insertions(+)

diff -puN arch/x86/entry/syscalls/syscall_32.tbl~pkeys-16-x86-mprotect_key arch/x86/entry/syscalls/syscall_32.tbl
--- a/arch/x86/entry/syscalls/syscall_32.tbl~pkeys-16-x86-mprotect_key	2015-12-03 16:21:31.109919982 -0800
+++ b/arch/x86/entry/syscalls/syscall_32.tbl	2015-12-03 16:21:31.118920390 -0800
@@ -383,3 +383,4 @@
 374	i386	userfaultfd		sys_userfaultfd
 375	i386	membarrier		sys_membarrier
 376	i386	mlock2			sys_mlock2
+377	i386	pkey_mprotect		sys_pkey_mprotect
diff -puN arch/x86/entry/syscalls/syscall_64.tbl~pkeys-16-x86-mprotect_key arch/x86/entry/syscalls/syscall_64.tbl
--- a/arch/x86/entry/syscalls/syscall_64.tbl~pkeys-16-x86-mprotect_key	2015-12-03 16:21:31.111920072 -0800
+++ b/arch/x86/entry/syscalls/syscall_64.tbl	2015-12-03 16:21:31.118920390 -0800
@@ -332,6 +332,7 @@
 323	common	userfaultfd		sys_userfaultfd
 324	common	membarrier		sys_membarrier
 325	common	mlock2			sys_mlock2
+326	common	pkey_mprotect		sys_pkey_mprotect
 
 #
 # x32-specific system call numbers start at 512 to avoid cache impact
diff -puN arch/x86/include/uapi/asm/mman.h~pkeys-16-x86-mprotect_key arch/x86/include/uapi/asm/mman.h
--- a/arch/x86/include/uapi/asm/mman.h~pkeys-16-x86-mprotect_key	2015-12-03 16:21:31.113920163 -0800
+++ b/arch/x86/include/uapi/asm/mman.h	2015-12-03 16:21:31.118920390 -0800
@@ -20,6 +20,12 @@
 		((vm_flags) & VM_PKEY_BIT1 ? _PAGE_PKEY_BIT1 : 0) |	\
 		((vm_flags) & VM_PKEY_BIT2 ? _PAGE_PKEY_BIT2 : 0) |	\
 		((vm_flags) & VM_PKEY_BIT3 ? _PAGE_PKEY_BIT3 : 0))
+
+#define arch_calc_vm_prot_bits(prot, key) (		\
+		((key) & 0x1 ? VM_PKEY_BIT0 : 0) |      \
+		((key) & 0x2 ? VM_PKEY_BIT1 : 0) |      \
+		((key) & 0x4 ? VM_PKEY_BIT2 : 0) |      \
+		((key) & 0x8 ? VM_PKEY_BIT3 : 0))
 #endif
 
 #include <asm-generic/mman.h>
diff -puN mm/Kconfig~pkeys-16-x86-mprotect_key mm/Kconfig
--- a/mm/Kconfig~pkeys-16-x86-mprotect_key	2015-12-03 16:21:31.114920208 -0800
+++ b/mm/Kconfig	2015-12-03 16:21:31.119920435 -0800
@@ -679,4 +679,5 @@ config NR_PROTECTION_KEYS
 	# Everything supports a _single_ key, so allow folks to
 	# at least call APIs that take keys, but require that the
 	# key be 0.
+	default 16 if X86_INTEL_MEMORY_PROTECTION_KEYS
 	default 1
_
--
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