[PATCH v11 01/10] signals, sparc: Add signal codes for ADI violations

Khalid Aziz
2018-02-01T18:02:15Z

SPARC M7 processor introduces a new feature - Application Data
Integrity (ADI). ADI allows MMU to catch rogue accesses to memory.
When a rogue access occurs, MMU blocks the access and raises an
exception. In response to the exception, kernel sends the offending
task a SIGSEGV with si_code that indicates the nature of exception.
This patch adds three new signal codes specific to ADI feature:

1. ADI is not enabled for the address and task attempted to access
memory using ADI
2. Task attempted to access memory using wrong ADI tag and caused
a deferred exception.
3. Task attempted to access memory using wrong ADI tag and caused
a precise exception.

Signed-off-by: Khalid Aziz <khalid.aziz@oracle.com>
Cc: Khalid Aziz <khalid@gonehiking.org>
Reviewed-by: Anthony Yznaga <anthony.yznaga@oracle.com>
---
v10:
- Updated si_code definitions to match other definitions

arch/x86/kernel/signal_compat.c | 2 +-
include/uapi/asm-generic/siginfo.h | 5 ++++-
2 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/arch/x86/kernel/signal_compat.c b/arch/x86/kernel/signal_compat.c
index 8c6da1a643da..20be1bc923f9 100644
--- a/arch/x86/kernel/signal_compat.c
+++ b/arch/x86/kernel/signal_compat.c
@@ -27,7 +27,7 @@ static inline void signal_compat_build_tests(void)
*/
BUILD_BUG_ON(NSIGILL != 8);
BUILD_BUG_ON(NSIGFPE != 8);
- BUILD_BUG_ON(NSIGSEGV != 4);
+ BUILD_BUG_ON(NSIGSEGV != 7);
BUILD_BUG_ON(NSIGBUS != 5);
BUILD_BUG_ON(NSIGTRAP != 4);
BUILD_BUG_ON(NSIGCHLD != 6);
diff --git a/include/uapi/asm-generic/siginfo.h b/include/uapi/asm-generic/siginfo.h
index e447283b8f52..279b7c0d2977 100644
--- a/include/uapi/asm-generic/siginfo.h
+++ b/include/uapi/asm-generic/siginfo.h
@@ -202,7 +202,10 @@ typedef struct siginfo {
#define SEGV_ACCERR 2 /* invalid permissions for mapped object */
#define SEGV_BNDERR 3 /* failed address bound checks */
#define SEGV_PKUERR 4 /* failed protection key checks */
-#define NSIGSEGV 4
+#define SEGV_ACCADI 5 /* ADI not enabled for mapped object */
+#define SEGV_ADIDERR 6 /* Disrupting MCD error */
+#define SEGV_ADIPERR 7 /* Precise MCD exception */
+#define NSIGSEGV 7

/*
* SIGBUS si_codes
--
2.11.0