1 files changed, 18 insertions, 4 deletions

diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c
index c4648adadd7d..0d8071d7addb 100644
--- a/arch/x86/kernel/setup.c
+++ b/arch/x86/kernel/setup.c
@@ -121,6 +121,8 @@
 unsigned long max_low_pfn_mapped;
 unsigned long max_pfn_mapped;
 
+bool __read_mostly kaslr_enabled = false;
+
 #ifdef CONFIG_DMI
 RESERVE_BRK(dmi_alloc, 65536);
 #endif
@@ -424,6 +426,11 @@ static void __init reserve_initrd(void)
 }
 #endif /* CONFIG_BLK_DEV_INITRD */
 
+static void __init parse_kaslr_setup(u64 pa_data, u32 data_len)
+{
+        kaslr_enabled = (bool)(pa_data + sizeof(struct setup_data));
+}
+
 static void __init parse_setup_data(void)
 {
         struct setup_data *data;
@@ -449,6 +456,9 @@ static void __init parse_setup_data(void)
                 case SETUP_EFI:
                         parse_efi_setup(pa_data, data_len);
                         break;
+                case SETUP_KASLR:
+                        parse_kaslr_setup(pa_data, data_len);
+                        break;
                 default:
                         break;
                 }
@@ -831,10 +841,14 @@ static void __init trim_low_memory_range(void)
 static int
 dump_kernel_offset(struct notifier_block *self, unsigned long v, void *p)
 {
-        pr_emerg("Kernel Offset: 0x%lx from 0x%lx "
-                 "(relocation range: 0x%lx-0x%lx)\n",
-                 (unsigned long)&_text - __START_KERNEL, __START_KERNEL,
-                 __START_KERNEL_map, MODULES_VADDR-1);
+        if (kaslr_enabled)
+                pr_emerg("Kernel Offset: 0x%lx from 0x%lx (relocation range: 0x%lx-0x%lx)\n",
+                         (unsigned long)&_text - __START_KERNEL,
+                         __START_KERNEL,
+                         __START_KERNEL_map,
+                         MODULES_VADDR-1);
+        else
+                pr_emerg("Kernel Offset: disabled\n");
 
         return 0;
 }