[PATCH] x86_64: Increase the variability of the process stack on 64bit architectures

8MB is not really very random, use 1GB (or more with larger page sizes)
instead.

Also use the low bits of the random generator output now instead of
throwing them away.

Only enabled on x86-64 right now. Other architectures need to add
a suitable STACK_RND_MASK

Cc: mingo@elte.hu
Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 9 insertions, 4 deletions

diff --git a/fs/binfmt_elf.c b/fs/binfmt_elf.c
index 4349113881fb..537893a16014 100644
--- a/fs/binfmt_elf.c
+++ b/fs/binfmt_elf.c
@@ -500,17 +500,22 @@ out:
 #define INTERPRETER_AOUT 1
 #define INTERPRETER_ELF 2
 
+#ifndef STACK_RND_MASK
+#define STACK_RND_MASK 0x7ff            /* with 4K pages 8MB of VA */
+#endif
 
 static unsigned long randomize_stack_top(unsigned long stack_top)
 {
         unsigned int random_variable = 0;
 
-        if (current->flags & PF_RANDOMIZE)
-                random_variable = get_random_int() % (8*1024*1024);
+        if (current->flags & PF_RANDOMIZE) {
+                random_variable = get_random_int() & STACK_RND_MASK;
+                random_variable <<= PAGE_SHIFT;
+        }
 #ifdef CONFIG_STACK_GROWSUP
-        return PAGE_ALIGN(stack_top + random_variable);
+        return PAGE_ALIGN(stack_top) + random_variable;
 #else
-        return PAGE_ALIGN(stack_top - random_variable);
+        return PAGE_ALIGN(stack_top) - random_variable;
 #endif
 }