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author | Dave Hansen <dave.hansen@linux.intel.com> | 2016-02-12 13:02:32 -0800 |
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committer | Ingo Molnar <mingo@kernel.org> | 2016-02-18 19:46:31 +0100 |
commit | 66d375709d2c891acc639538fd3179fa0cbb0daf (patch) | |
tree | e4130fdef51a5d4820e8e870d34a42d7b384c9b0 /arch/x86/include | |
parent | e6bfb70959a0ca6ddedb29e779a293c6f71ed0e7 (diff) | |
download | linux-66d375709d2c891acc639538fd3179fa0cbb0daf.tar.gz linux-66d375709d2c891acc639538fd3179fa0cbb0daf.tar.bz2 linux-66d375709d2c891acc639538fd3179fa0cbb0daf.zip |
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>
Diffstat (limited to 'arch/x86/include')
-rw-r--r-- | arch/x86/include/asm/pkeys.h | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/arch/x86/include/asm/pkeys.h b/arch/x86/include/asm/pkeys.h new file mode 100644 index 000000000000..04243c23380c --- /dev/null +++ b/arch/x86/include/asm/pkeys.h @@ -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 */ |