Commit d84bb709 authored Feb 21, 2018 by Khalid Aziz Committed by David S. Miller Mar 18, 2018

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>

parent 8f5fd927

arch/x86/kernel/signal_compat.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -27,7 +27,7 @@ static inline void signal_compat_build_tests(void)
		*/
		BUILD_BUG_ON(NSIGILL != 11);
		BUILD_BUG_ON(NSIGFPE != 13);
		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);

include/uapi/asm-generic/siginfo.h

+4 −1

Original line number	Diff line number	Diff line
		@@ -246,7 +246,10 @@ typedef struct siginfo {
		#else
		# define SEGV_PKUERR 4 /* failed protection key checks */
		#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

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