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 different set of permission bits. You can use mprotect()
after the attach to assign an attched SHM segment a protection
key.
---
b/arch/x86/include/uapi/asm/mman.h | 6 ++++++
b/include/uapi/asm-generic/mman-common.h | 4 ++++
2 files changed, 10 insertions(+)
diff -puN arch/x86/include/uapi/asm/mman.h~pkeys-80-user-abi-bits arch/x86/include/uapi/asm/mman.h
--- a/arch/x86/include/uapi/asm/mman.h~pkeys-80-user-abi-bits 2015-09-16 09:45:54.123412488 -0700
+++ b/arch/x86/include/uapi/asm/mman.h 2015-09-16 09:45:54.129412761 -0700
@@ -20,6 +20,12 @@
((vm_flags) & VM_PKEY_BIT1 ? _PAGE_PKEY_BIT1 : 0) | \
((vm_flags) & VM_PKEY_BIT2 ? _PAGE_PKEY_BIT2 : 0) | \
((vm_flags) & VM_PKEY_BIT3 ? _PAGE_PKEY_BIT3 : 0))
+
+#define arch_calc_vm_prot_bits(prot) ( \
+ ((prot) & PROT_PKEY0 ? VM_PKEY_BIT0 : 0) | \
+ ((prot) & PROT_PKEY1 ? VM_PKEY_BIT1 : 0) | \
+ ((prot) & PROT_PKEY2 ? VM_PKEY_BIT2 : 0) | \
+ ((prot) & PROT_PKEY3 ? VM_PKEY_BIT3 : 0))
#endif
#include <asm-generic/mman.h>
diff -puN include/uapi/asm-generic/mman-common.h~pkeys-80-user-abi-bits include/uapi/asm-generic/mman-common.h
--- a/include/uapi/asm-generic/mman-common.h~pkeys-80-user-abi-bits 2015-09-16 09:45:54.125412579 -0700
+++ b/include/uapi/asm-generic/mman-common.h 2015-09-16 09:45:54.128412715 -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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