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powerpc: introduce execute-only pkey

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This patch provides the implementation of execute-only pkey.
The architecture-independent layer expects the arch-dependent
layer, to support the ability to create and enable a special
key which has execute-only permission.

Acked-by: Balbir Singh <bsingharora@gmail.com>
Signed-off-by: Ram Pai <linuxram@us.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Ram Pai
2018-01-18 17:50:32 -08:00
committed by Michael Ellerman
parent 06bb53b338
commit 5586cf61e1
3 changed files with 64 additions and 1 deletions
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6
arch/powerpc/include/asm/pkeys.h
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@@ -117,9 +117,13 @@ static inline int mm_pkey_free(struct mm_struct *mm, int pkey)
* Try to dedicate one of the protection keys to be used as an
* execute-only protection key.
*/
extern int __execute_only_pkey(struct mm_struct *mm);
static inline int execute_only_pkey(struct mm_struct *mm)
{
return 0;
if (static_branch_likely(&pkey_disabled))
return -1;
return __execute_only_pkey(mm);
}
static inline int arch_override_mprotect_pkey(struct vm_area_struct *vma,