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signals, sparc: Add signal codes for ADI violations 

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>
Acked-by: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Khalid Aziz 2018-02-21 10:15:43 -07:00 committed by David S. Miller
parent 8f5fd927c3
commit d84bb709aa
2 changed files with 5 additions and 2 deletions
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2
arch/x86/kernel/signal_compat.c
View File

@ -27,7 +27,7 @@ static inline void signal_compat_build_tests(void)
*/ */
BUILD_BUG_ON(NSIGILL != 11); BUILD_BUG_ON(NSIGILL != 11);
BUILD_BUG_ON(NSIGFPE != 13); BUILD_BUG_ON(NSIGFPE != 13);
BUILD_BUG_ON(NSIGSEGV != 4); BUILD_BUG_ON(NSIGSEGV != 7);
BUILD_BUG_ON(NSIGBUS != 5); BUILD_BUG_ON(NSIGBUS != 5);
BUILD_BUG_ON(NSIGTRAP != 4); BUILD_BUG_ON(NSIGTRAP != 4);
BUILD_BUG_ON(NSIGCHLD != 6); BUILD_BUG_ON(NSIGCHLD != 6);

5
include/uapi/asm-generic/siginfo.h
View File

@ -246,7 +246,10 @@ typedef struct siginfo {
#else #else
# define SEGV_PKUERR 4 /* failed protection key checks */ # define SEGV_PKUERR 4 /* failed protection key checks */
#endif #endif
#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 * SIGBUS si_codes