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ARM: 6877/1: the ADDR_NO_RANDOMIZE personality flag should be honored with mmap() 

Signed-off-by: Nicolas Pitre <nicolas.pitre@linaro.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Nicolas Pitre 2011-04-13 04:57:17 +01:00 committed by Russell King
parent b025a3f836
commit df5419a9a9
1 changed files with 3 additions and 1 deletions
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4
arch/arm/mm/mmap.c
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@ -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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