x86, kaslr: randomize module base load address

Randomize the load address of modules in the kernel to make kASLR
effective for modules.  Modules can only be loaded within a particular
range of virtual address space.  This patch adds 10 bits of entropy to
the load address by adding 1-1024 * PAGE_SIZE to the beginning range
where modules are loaded.

The single base offset was chosen because randomizing each module
load ends up wasting/fragmenting memory too much. Prior approaches to
minimizing fragmentation while doing randomization tend to result in
worse entropy than just doing a single base address offset.

Example kASLR boot without this change, with a single module loaded:
---[ Modules ]---
0xffffffffc0000000-0xffffffffc0001000           4K     ro     GLB x  pte
0xffffffffc0001000-0xffffffffc0002000           4K     ro     GLB NX pte
0xffffffffc0002000-0xffffffffc0004000           8K     RW     GLB NX pte
0xffffffffc0004000-0xffffffffc0200000        2032K                   pte
0xffffffffc0200000-0xffffffffff000000        1006M                   pmd
---[ End Modules ]---

Example kASLR boot after this change, same module loaded:
---[ Modules ]---
0xffffffffc0000000-0xffffffffc0200000           2M                   pmd
0xffffffffc0200000-0xffffffffc03bf000        1788K                   pte
0xffffffffc03bf000-0xffffffffc03c0000           4K     ro     GLB x  pte
0xffffffffc03c0000-0xffffffffc03c1000           4K     ro     GLB NX pte
0xffffffffc03c1000-0xffffffffc03c3000           8K     RW     GLB NX pte
0xffffffffc03c3000-0xffffffffc0400000         244K                   pte
0xffffffffc0400000-0xffffffffff000000        1004M                   pmd
---[ End Modules ]---

Signed-off-by: Andy Honig <ahonig@google.com>
Link: http://lkml.kernel.org/r/20140226005916.GA27083@www.outflux.net
Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>

1 files changed, 40 insertions, 3 deletions

diff --git a/arch/x86/kernel/module.c b/arch/x86/kernel/module.c
index 18be189368bb..49483137371f 100644
--- a/arch/x86/kernel/module.c
+++ b/arch/x86/kernel/module.c
@@ -28,6 +28,7 @@
 #include <linux/mm.h>
 #include <linux/gfp.h>
 #include <linux/jump_label.h>
+#include <linux/random.h>
 
 #include <asm/page.h>
 #include <asm/pgtable.h>
@@ -43,13 +44,49 @@ do {							\
 } while (0)
 #endif
 
+#ifdef CONFIG_RANDOMIZE_BASE
+static unsigned long module_load_offset;
+static int randomize_modules = 1;
+
+static int __init parse_nokaslr(char *p)
+{
+        randomize_modules = 0;
+        return 0;
+}
+early_param("nokaslr", parse_nokaslr);
+
+static unsigned long int get_module_load_offset(void)
+{
+        if (randomize_modules) {
+                mutex_lock(&module_mutex);
+                /*
+                 * Calculate the module_load_offset the first time this
+                 * code is called. Once calculated it stays the same until
+                 * reboot.
+                 */
+                if (module_load_offset == 0)
+                        module_load_offset =
+                                (get_random_int() % 1024 + 1) * PAGE_SIZE;
+                mutex_unlock(&module_mutex);
+        }
+        return module_load_offset;
+}
+#else
+static unsigned long int get_module_load_offset(void)
+{
+        return 0;
+}
+#endif
+
 void *module_alloc(unsigned long size)
 {
         if (PAGE_ALIGN(size) > MODULES_LEN)
                 return NULL;
-        return __vmalloc_node_range(size, 1, MODULES_VADDR, MODULES_END,
-                                GFP_KERNEL | __GFP_HIGHMEM, PAGE_KERNEL_EXEC,
-                                NUMA_NO_NODE, __builtin_return_address(0));
+        return __vmalloc_node_range(size, 1,
+                                    MODULES_VADDR + get_module_load_offset(),
+                                    MODULES_END, GFP_KERNEL | __GFP_HIGHMEM,
+                                    PAGE_KERNEL_EXEC, NUMA_NO_NODE,
+                                    __builtin_return_address(0));
 }
 
 #ifdef CONFIG_X86_32