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mm/core, x86/mm/pkeys: Add arch_validate_pkey() 

The syscall-level code is passed a protection key and need to
return an appropriate error code if the protection key is bogus.
We will be using this in subsequent patches.

Note that this also begins a series of arch-specific calls that
we need to expose in otherwise arch-independent code.  We create
a linux/pkeys.h header where we will put *all* the stubs for
these functions.

Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Dave Hansen <dave@sr71.net>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rik van Riel <riel@redhat.com>
Cc: linux-mm@kvack.org
Link: http://lkml.kernel.org/r/20160212210232.774EEAAB@viggo.jf.intel.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Dave Hansen 2016-02-12 13:02:32 -08:00 committed by Ingo Molnar
parent e6bfb70959
commit 66d375709d
4 changed files with 34 additions and 0 deletions
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1
arch/x86/Kconfig
View File

@ -156,6 +156,7 @@ config X86
select X86_DEV_DMA_OPS if X86_64
select X86_FEATURE_NAMES if PROC_FS
select ARCH_USES_HIGH_VMA_FLAGS if X86_INTEL_MEMORY_PROTECTION_KEYS
select ARCH_HAS_PKEYS if X86_INTEL_MEMORY_PROTECTION_KEYS
config INSTRUCTION_DECODER
def_bool y

6
arch/x86/include/asm/pkeys.h Normal file
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@ -0,0 +1,6 @@
#ifndef _ASM_X86_PKEYS_H
#define _ASM_X86_PKEYS_H
#define arch_max_pkey() (boot_cpu_has(X86_FEATURE_OSPKE) ? 16 : 1)
#endif /*_ASM_X86_PKEYS_H */

25
include/linux/pkeys.h Normal file
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@ -0,0 +1,25 @@
#ifndef _LINUX_PKEYS_H
#define _LINUX_PKEYS_H
#include <linux/mm_types.h>
#include <asm/mmu_context.h>
#ifdef CONFIG_ARCH_HAS_PKEYS
#include <asm/pkeys.h>
#else /* ! CONFIG_ARCH_HAS_PKEYS */
#define arch_max_pkey() (1)
#endif /* ! CONFIG_ARCH_HAS_PKEYS */
/*
* This is called from mprotect_pkey().
*
* Returns true if the protection keys is valid.
*/
static inline bool validate_pkey(int pkey)
{
if (pkey < 0)
return false;
return (pkey < arch_max_pkey());
}
#endif /* _LINUX_PKEYS_H */

2
mm/Kconfig
View File

@ -672,3 +672,5 @@ config FRAME_VECTOR
config ARCH_USES_HIGH_VMA_FLAGS
bool
config ARCH_HAS_PKEYS
bool