Merge git://git.linaro.org/nico/arm_security into devel-stable

3 files changed, 24 insertions, 0 deletions

diff --git a/arch/arm/kernel/asm-offsets.c b/arch/arm/kernel/asm-offsets.c
index 883511522fca..85f2a019f77b 100644
--- a/arch/arm/kernel/asm-offsets.c
+++ b/arch/arm/kernel/asm-offsets.c
@@ -40,6 +40,9 @@
 int main(void)
 {
   DEFINE(TSK_ACTIVE_MM,         offsetof(struct task_struct, active_mm));
+#ifdef CONFIG_CC_STACKPROTECTOR
+  DEFINE(TSK_STACK_CANARY,      offsetof(struct task_struct, stack_canary));
+#endif
   BLANK();
   DEFINE(TI_FLAGS,              offsetof(struct thread_info, flags));
   DEFINE(TI_PREEMPT,            offsetof(struct thread_info, preempt_count));
diff --git a/arch/arm/kernel/entry-armv.S b/arch/arm/kernel/entry-armv.S
index 7ee48e7f8f31..2d14081b26b1 100644
--- a/arch/arm/kernel/entry-armv.S
+++ b/arch/arm/kernel/entry-armv.S
@@ -745,6 +745,11 @@ ENTRY(__switch_to)
         mov     r4, #0xffff0fff
         str     r3, [r4, #-15]                  @ TLS val at 0xffff0ff0
 #endif
+#if defined(CONFIG_CC_STACKPROTECTOR) && !defined(CONFIG_SMP)
+        ldr     r7, [r2, #TI_TASK]
+        ldr     r8, =__stack_chk_guard
+        ldr     r7, [r7, #TSK_STACK_CANARY]
+#endif
 #ifdef CONFIG_MMU
         mcr     p15, 0, r6, c3, c0, 0           @ Set domain register
 #endif
@@ -753,6 +758,9 @@ ENTRY(__switch_to)
         ldr     r0, =thread_notify_head
         mov     r1, #THREAD_NOTIFY_SWITCH
         bl      atomic_notifier_call_chain
+#if defined(CONFIG_CC_STACKPROTECTOR) && !defined(CONFIG_SMP)
+        str     r7, [r8]
+#endif
  THUMB( mov     ip, r4                     )
         mov     r0, r5
  ARM(   ldmia   r4, {r4 - sl, fp, sp, pc}  )    @ Load all regs saved previously
diff --git a/arch/arm/kernel/process.c b/arch/arm/kernel/process.c
index acf5e6fdb6dc..090ac9459da1 100644
--- a/arch/arm/kernel/process.c
+++ b/arch/arm/kernel/process.c
@@ -28,6 +28,7 @@
 #include <linux/tick.h>
 #include <linux/utsname.h>
 #include <linux/uaccess.h>
+#include <linux/random.h>
 
 #include <asm/leds.h>
 #include <asm/processor.h>
@@ -36,6 +37,12 @@
 #include <asm/stacktrace.h>
 #include <asm/mach/time.h>
 
+#ifdef CONFIG_CC_STACKPROTECTOR
+#include <linux/stackprotector.h>
+unsigned long __stack_chk_guard __read_mostly;
+EXPORT_SYMBOL(__stack_chk_guard);
+#endif
+
 static const char *processor_modes[] = {
   "USER_26", "FIQ_26" , "IRQ_26" , "SVC_26" , "UK4_26" , "UK5_26" , "UK6_26" , "UK7_26" ,
   "UK8_26" , "UK9_26" , "UK10_26", "UK11_26", "UK12_26", "UK13_26", "UK14_26", "UK15_26",
@@ -421,3 +428,9 @@ unsigned long get_wchan(struct task_struct *p)
         } while (count ++ < 16);
         return 0;
 }
+
+unsigned long arch_randomize_brk(struct mm_struct *mm)
+{
+        unsigned long range_end = mm->brk + 0x02000000;
+        return randomize_range(mm->brk, range_end, 0) ? : mm->brk;
+}