lkml.org 
[lkml]   [2017]   [Jul]   [15]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[RFC v6 19/62] powerpc: ability to create execute-disabled pkeys
Date
powerpc has hardware support to disable execute on a pkey.
This patch enables the ability to create execute-disabled
keys.

Signed-off-by: Ram Pai <linuxram@us.ibm.com>
---
arch/powerpc/include/asm/pkeys.h | 12 ++++++++++++
arch/powerpc/mm/pkeys.c | 10 ++++++++++
2 files changed, 22 insertions(+), 0 deletions(-)

diff --git a/arch/powerpc/include/asm/pkeys.h b/arch/powerpc/include/asm/pkeys.h
index 1943e6b..0e744f1 100644
--- a/arch/powerpc/include/asm/pkeys.h
+++ b/arch/powerpc/include/asm/pkeys.h
@@ -2,6 +2,18 @@
#define _ASM_PPC64_PKEYS_H

extern bool pkey_inited;
+/* override any generic PKEY Permission defines */
+#undef PKEY_DISABLE_ACCESS
+#define PKEY_DISABLE_ACCESS 0x1
+#undef PKEY_DISABLE_WRITE
+#define PKEY_DISABLE_WRITE 0x2
+#undef PKEY_DISABLE_EXECUTE
+#define PKEY_DISABLE_EXECUTE 0x4
+#undef PKEY_ACCESS_MASK
+#define PKEY_ACCESS_MASK (PKEY_DISABLE_ACCESS |\
+ PKEY_DISABLE_WRITE |\
+ PKEY_DISABLE_EXECUTE)
+
#define arch_max_pkey() 32
#define AMR_RD_BIT 0x1UL
#define AMR_WR_BIT 0x2UL
diff --git a/arch/powerpc/mm/pkeys.c b/arch/powerpc/mm/pkeys.c
index 98d0391..b9ad98d 100644
--- a/arch/powerpc/mm/pkeys.c
+++ b/arch/powerpc/mm/pkeys.c
@@ -73,6 +73,7 @@ int __arch_set_user_pkey_access(struct task_struct *tsk, int pkey,
unsigned long init_val)
{
u64 new_amr_bits = 0x0ul;
+ u64 new_iamr_bits = 0x0ul;

if (!is_pkey_enabled(pkey))
return -1;
@@ -85,5 +86,14 @@ int __arch_set_user_pkey_access(struct task_struct *tsk, int pkey,

init_amr(pkey, new_amr_bits);

+ /*
+ * By default execute is disabled.
+ * To enable execute, PKEY_ENABLE_EXECUTE
+ * needs to be specified.
+ */
+ if ((init_val & PKEY_DISABLE_EXECUTE))
+ new_iamr_bits |= IAMR_EX_BIT;
+
+ init_iamr(pkey, new_iamr_bits);
return 0;
}
--
1.7.1
\
 
 \ /
  Last update: 2017-07-16 06:11    [W:0.365 / U:55.244 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site