[S390] fix SIGBUS handling

Raise SIGBUS with a siginfo structure. Deliver BUS_ADRERR as si_code and
the address of the fault in the si_addr field.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

1 files changed, 11 insertions, 3 deletions

diff --git a/arch/s390/mm/fault.c b/arch/s390/mm/fault.c
index b49d12073f10..bae2c282221c 100644
--- a/arch/s390/mm/fault.c
+++ b/arch/s390/mm/fault.c
@@ -212,14 +212,21 @@ static noinline void do_sigbus(struct pt_regs *regs, long int_code,
                                unsigned long trans_exc_code)
 {
         struct task_struct *tsk = current;
+        unsigned long address;
+        struct siginfo si;
 
         /*
          * Send a sigbus, regardless of whether we were in kernel
          * or user mode.
          */
-        tsk->thread.prot_addr = trans_exc_code & __FAIL_ADDR_MASK;
+        address = trans_exc_code & __FAIL_ADDR_MASK;
+        tsk->thread.prot_addr = address;
         tsk->thread.trap_no = int_code;
-        force_sig(SIGBUS, tsk);
+        si.si_signo = SIGBUS;
+        si.si_errno = 0;
+        si.si_code = BUS_ADRERR;
+        si.si_addr = (void __user *) address;
+        force_sig_info(SIGBUS, &si, tsk);
 }
 
 #ifdef CONFIG_S390_EXEC_PROTECT
@@ -279,10 +286,11 @@ static noinline void do_fault_error(struct pt_regs *regs, long int_code,
                 if (fault & VM_FAULT_OOM)
                         pagefault_out_of_memory();
                 else if (fault & VM_FAULT_SIGBUS) {
-                        do_sigbus(regs, int_code, trans_exc_code);
                         /* Kernel mode? Handle exceptions or die */
                         if (!(regs->psw.mask & PSW_MASK_PSTATE))
                                 do_no_context(regs, int_code, trans_exc_code);
+                        else
+                                do_sigbus(regs, int_code, trans_exc_code);
                 } else
                         BUG();
                 break;