1 files changed, 52 insertions, 28 deletions

diff --git a/arch/s390/kernel/process.c b/arch/s390/kernel/process.c
index d3a2d1c6438e..541a7509faeb 100644
--- a/arch/s390/kernel/process.c
+++ b/arch/s390/kernel/process.c
@@ -9,38 +9,27 @@
 
 #include <linux/compiler.h>
 #include <linux/cpu.h>
-#include <linux/errno.h>
 #include <linux/sched.h>
 #include <linux/kernel.h>
 #include <linux/mm.h>
-#include <linux/fs.h>
 #include <linux/smp.h>
-#include <linux/stddef.h>
 #include <linux/slab.h>
-#include <linux/unistd.h>
-#include <linux/ptrace.h>
-#include <linux/vmalloc.h>
-#include <linux/user.h>
 #include <linux/interrupt.h>
-#include <linux/delay.h>
-#include <linux/reboot.h>
-#include <linux/init.h>
-#include <linux/module.h>
-#include <linux/notifier.h>
 #include <linux/tick.h>
-#include <linux/elfcore.h>
-#include <linux/kernel_stat.h>
+#include <linux/personality.h>
 #include <linux/syscalls.h>
 #include <linux/compat.h>
-#include <asm/compat.h>
-#include <asm/uaccess.h>
-#include <asm/pgtable.h>
+#include <linux/kprobes.h>
+#include <linux/random.h>
+#include <linux/module.h>
 #include <asm/system.h>
 #include <asm/io.h>
 #include <asm/processor.h>
 #include <asm/irq.h>
 #include <asm/timer.h>
 #include <asm/nmi.h>
+#include <asm/compat.h>
+#include <asm/smp.h>
 #include "entry.h"
 
 asmlinkage void ret_from_fork(void) asm ("ret_from_fork");
@@ -75,18 +64,13 @@ unsigned long thread_saved_pc(struct task_struct *tsk)
  */
 static void default_idle(void)
 {
-        /* CPU is going idle. */
+        if (cpu_is_offline(smp_processor_id()))
+                cpu_die();
         local_irq_disable();
         if (need_resched()) {
                 local_irq_enable();
                 return;
         }
-#ifdef CONFIG_HOTPLUG_CPU
-        if (cpu_is_offline(smp_processor_id())) {
-                preempt_enable_no_resched();
-                cpu_die();
-        }
-#endif
         local_mcck_disable();
         if (test_thread_flag(TIF_MCCK_PENDING)) {
                 local_mcck_enable();
@@ -116,15 +100,17 @@ void cpu_idle(void)
         }
 }
 
-extern void kernel_thread_starter(void);
+extern void __kprobes kernel_thread_starter(void);
 
 asm(
-        ".align 4\n"
+        ".section .kprobes.text, \"ax\"\n"
+        ".global kernel_thread_starter\n"
         "kernel_thread_starter:\n"
         "    la    2,0(10)\n"
         "    basr  14,9\n"
         "    la    2,0\n"
-        "    br    11\n");
+        "    br    11\n"
+        ".previous\n");
 
 int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags)
 {
@@ -214,8 +200,10 @@ int copy_thread(unsigned long clone_flags, unsigned long new_stackp,
         /* start new process with ar4 pointing to the correct address space */
         p->thread.mm_segment = get_fs();
         /* Don't copy debug registers */
-        memset(&p->thread.per_info, 0, sizeof(p->thread.per_info));
+        memset(&p->thread.per_user, 0, sizeof(p->thread.per_user));
+        memset(&p->thread.per_event, 0, sizeof(p->thread.per_event));
         clear_tsk_thread_flag(p, TIF_SINGLE_STEP);
+        clear_tsk_thread_flag(p, TIF_PER_TRAP);
         /* Initialize per thread user and system timer values */
         ti = task_thread_info(p);
         ti->user_timer = 0;
@@ -331,3 +319,39 @@ unsigned long get_wchan(struct task_struct *p)
         }
         return 0;
 }
+
+unsigned long arch_align_stack(unsigned long sp)
+{
+        if (!(current->personality & ADDR_NO_RANDOMIZE) && randomize_va_space)
+                sp -= get_random_int() & ~PAGE_MASK;
+        return sp & ~0xf;
+}
+
+static inline unsigned long brk_rnd(void)
+{
+        /* 8MB for 32bit, 1GB for 64bit */
+        if (is_32bit_task())
+                return (get_random_int() & 0x7ffUL) << PAGE_SHIFT;
+        else
+                return (get_random_int() & 0x3ffffUL) << PAGE_SHIFT;
+}
+
+unsigned long arch_randomize_brk(struct mm_struct *mm)
+{
+        unsigned long ret = PAGE_ALIGN(mm->brk + brk_rnd());
+
+        if (ret < mm->brk)
+                return mm->brk;
+        return ret;
+}
+
+unsigned long randomize_et_dyn(unsigned long base)
+{
+        unsigned long ret = PAGE_ALIGN(base + brk_rnd());
+
+        if (!(current->flags & PF_RANDOMIZE))
+                return base;
+        if (ret < base)
+                return base;
+        return ret;
+}