Merge branch 'linux-linaro-lsk-v4.4' into linux-linaro-lsk-v4.4-android

[firefly-linux-kernel-4.4.55.git] / arch / arm64 / kernel / setup.c

diff --git a/arch/arm64/kernel/setup.c b/arch/arm64/kernel/setup.c
index 8119479147db147c33800f76aa0d07c6072e8559..6591bf23422b3471fa8fb83d04445aac33dd808d 100644 (file)
--- a/arch/arm64/kernel/setup.c
+++ b/arch/arm64/kernel/setup.c
@@ -62,6 +62,7 @@
 #include <asm/memblock.h>
 #include <asm/efi.h>
 #include <asm/xen/hypervisor.h>
+#include <asm/mmu_context.h>
 
 phys_addr_t __fdt_pointer __initdata;
 
@@ -201,7 +202,7 @@ static void __init request_standard_resources(void)
        struct resource *res;
 
        kernel_code.start   = virt_to_phys(_text);
-       kernel_code.end     = virt_to_phys(_etext - 1);
+       kernel_code.end     = virt_to_phys(__init_begin - 1);
        kernel_data.start   = virt_to_phys(_sdata);
        kernel_data.end     = virt_to_phys(_end - 1);
 
@@ -313,6 +314,12 @@ void __init setup_arch(char **cmdline_p)
         */
        local_async_enable();
 
+       /*
+        * TTBR0 is only used for the identity mapping at this stage. Make it
+        * point to zero page to avoid speculatively fetching new entries.
+        */
+       cpu_uninstall_idmap();
+
        efi_init();
        arm64_memblock_init();
 
@@ -340,6 +347,15 @@ void __init setup_arch(char **cmdline_p)
        smp_init_cpus();
        smp_build_mpidr_hash();
 
+#ifdef CONFIG_ARM64_SW_TTBR0_PAN
+       /*
+        * Make sure init_thread_info.ttbr0 always generates translation
+        * faults in case uaccess_enable() is inadvertently called by the init
+        * thread.
+        */
+       init_thread_info.ttbr0 = virt_to_phys(empty_zero_page);
+#endif
+
 #ifdef CONFIG_VT
 #if defined(CONFIG_VGA_CONSOLE)
        conswitchp = &vga_con;
@@ -381,3 +397,32 @@ static int __init topology_init(void)
        return 0;
 }
 subsys_initcall(topology_init);
+
+/*
+ * Dump out kernel offset information on panic.
+ */
+static int dump_kernel_offset(struct notifier_block *self, unsigned long v,
+                             void *p)
+{
+       u64 const kaslr_offset = kimage_vaddr - KIMAGE_VADDR;
+
+       if (IS_ENABLED(CONFIG_RANDOMIZE_BASE) && kaslr_offset > 0) {
+               pr_emerg("Kernel Offset: 0x%llx from 0x%lx\n",
+                        kaslr_offset, KIMAGE_VADDR);
+       } else {
+               pr_emerg("Kernel Offset: disabled\n");
+       }
+       return 0;
+}
+
+static struct notifier_block kernel_offset_notifier = {
+       .notifier_call = dump_kernel_offset
+};
+
+static int __init register_kernel_offset_dumper(void)
+{
+       atomic_notifier_chain_register(&panic_notifier_list,
+                                      &kernel_offset_notifier);
+       return 0;
+}
+__initcall(register_kernel_offset_dumper);