[MIPS] User stack pointer randomisation

Signed-off-by: Franck Bui-Huu <fbuihuu@gmail.com> Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
git-mirror · Jul 20, 2007 · 9410910 · 9410910
1 parent c55757b
commit 9410910
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Showing 2 changed files with 15 additions and 1 deletion.
diff --git a/arch/mips/kernel/process.c b/arch/mips/kernel/process.c
@@ -25,7 +25,9 @@
 #include <linux/init.h>
 #include <linux/completion.h>
 #include <linux/kallsyms.h>
+#include <linux/random.h>
 
+#include <asm/asm.h>
 #include <asm/bootinfo.h>
 #include <asm/cpu.h>
 #include <asm/dsp.h>
@@ -460,3 +462,15 @@ unsigned long get_wchan(struct task_struct *task)
 out:
 	return pc;
 }
+
+/*
+ * Don't forget that the stack pointer must be aligned on a 8 bytes
+ * boundary for 32-bits ABI and 16 bytes for 64-bits ABI.
+ */
+unsigned long arch_align_stack(unsigned long sp)
+{
+	if (!(current->personality & ADDR_NO_RANDOMIZE) && randomize_va_space)
+		sp -= get_random_int() & ~PAGE_MASK;
+
+	return sp & ALMASK;
+}
diff --git a/include/asm-mips/system.h b/include/asm-mips/system.h
@@ -470,6 +470,6 @@ extern int stop_a_enabled;
  */
 #define __ARCH_WANT_UNLOCKED_CTXSW
 
-#define arch_align_stack(x) (x)
+extern unsigned long arch_align_stack(unsigned long sp);
 
 #endif /* _ASM_SYSTEM_H */