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
}
#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;
pa_data = boot_params.hdr.setup_data;
while (pa_data) {
- u32 data_len, map_len, data_type;
+ u32 data_len, data_type;
- map_len = max(PAGE_SIZE - (pa_data & ~PAGE_MASK),
- (u64)sizeof(struct setup_data));
- data = early_memremap(pa_data, map_len);
+ data = early_memremap(pa_data, sizeof(*data));
data_len = data->len + sizeof(struct setup_data);
data_type = data->type;
pa_next = data->next;
- early_iounmap(data, map_len);
+ early_iounmap(data, sizeof(*data));
switch (data_type) {
case SETUP_E820_EXT:
case SETUP_EFI:
parse_efi_setup(pa_data, data_len);
break;
+ case SETUP_KASLR:
+ parse_kaslr_setup(pa_data, data_len);
+ break;
default:
break;
}
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;
}