[RFC v4 02/17] mm: ability to disable execute permission on a key at creation

From: Ram Pai
Date: Tue Jun 27 2017 - 06:16:47 EST


Currently sys_pkey_create() provides the ability to disable read
and write permission on the key, at creation. powerpc has the
hardware support to disable execute on a pkey as well.This patch
enhances the interface to let disable execute at key creation
time. x86 does not allow this. Hence the next patch will add
ability in x86 to return error if PKEY_DISABLE_EXECUTE is
specified.

Signed-off-by: Ram Pai <linuxram@xxxxxxxxxx>
---
include/uapi/asm-generic/mman-common.h | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/include/uapi/asm-generic/mman-common.h b/include/uapi/asm-generic/mman-common.h
index 8c27db0..bf4fa07 100644
--- a/include/uapi/asm-generic/mman-common.h
+++ b/include/uapi/asm-generic/mman-common.h
@@ -74,7 +74,9 @@

#define PKEY_DISABLE_ACCESS 0x1
#define PKEY_DISABLE_WRITE 0x2
+#define PKEY_DISABLE_EXECUTE 0x4
#define PKEY_ACCESS_MASK (PKEY_DISABLE_ACCESS |\
- PKEY_DISABLE_WRITE)
+ PKEY_DISABLE_WRITE |\
+ PKEY_DISABLE_EXECUTE)

#endif /* __ASM_GENERIC_MMAN_COMMON_H */
--
1.8.3.1