If a system call takes a PROT_{NONE,EXEC,WRITE,...} argument,
this adds support to it to take a protection key.
mmap()
mrprotect()
drivers/char/agp/frontend.c's ioctl(AGPIOC_RESERVE)
This does not include direct support for shmat() since it uses
a diffferent set of permission bits. You can use mprotect()
after the attach to assign an attched SHM segment a protection
key.
---
b/include/uapi/asm-generic/mman-common.h | 4 ++++
1 file changed, 4 insertions(+)
diff -puN include/uapi/asm-generic/mman-common.h~pkeys-11-user-abi-bits
include/uapi/asm-generic/mman-common.h
--- a/include/uapi/asm-generic/mman-common.h~pkeys-11-user-abi-bits
2015-05-07 10:31:43.367276719 -0700
+++ b/include/uapi/asm-generic/mman-common.h 2015-05-07 10:31:43.370276855
-0700
@@ -10,6 +10,10 @@
#define PROT_WRITE 0x2 /* page can be written */
#define PROT_EXEC 0x4 /* page can be executed */
#define PROT_SEM 0x8 /* page may be used for atomic ops */
+#define PROT_PKEY0 0x10 /* protection key value (bit 0) */
+#define PROT_PKEY1 0x20 /* protection key value (bit 1) */
+#define PROT_PKEY2 0x40 /* protection key value (bit 2) */
+#define PROT_PKEY3 0x80 /* protection key value (bit 3) */
#define PROT_NONE 0x0 /* page can not be accessed */
#define PROT_GROWSDOWN 0x01000000 /* mprotect flag: extend change to
start of growsdown vma */
#define PROT_GROWSUP 0x02000000 /* mprotect flag: extend change to end
of growsup vma */
_
--
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