the ADDR_NO_RANDOMIZE personality flag should be honored with mmap()

Message ID alpine.LFD.2.00.1104122353510.28032@xanadu.home
State New
Headers show

Commit Message

Nicolas Pitre April 13, 2011, 3:57 a.m.
Signed-off-by: Nicolas Pitre <nicolas.pitre@linaro.org>
PATCH FOLLOWS
KernelVersion: v2.6.39-rc1

Patch

diff --git a/arch/arm/mm/mmap.c b/arch/arm/mm/mmap.c
index afe209e..74be05f 100644
--- a/arch/arm/mm/mmap.c
+++ b/arch/arm/mm/mmap.c
@@ -7,6 +7,7 @@ 
 #include <linux/shm.h>
 #include <linux/sched.h>
 #include <linux/io.h>
+#include <linux/personality.h>
 #include <linux/random.h>
 #include <asm/cputype.h>
 #include <asm/system.h>
@@ -82,7 +83,8 @@  arch_get_unmapped_area(struct file *filp, unsigned long addr,
 	        mm->cached_hole_size = 0;
 	}
 	/* 8 bits of randomness in 20 address space bits */
-	if (current->flags & PF_RANDOMIZE)
+	if ((current->flags & PF_RANDOMIZE) &&
+	    !(current->personality & ADDR_NO_RANDOMIZE))
 		addr += (get_random_int() % (1 << 8)) << PAGE_SHIFT;
 
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