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| author | Thomas Gleixner <tglx@linutronix.de> | 2014-02-21 21:36:40 +0100 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2014-02-21 21:37:09 +0100 |
| commit | d97a860c4f3de98ba5040a22f305b7159fe17cff (patch) | |
| tree | 90c2155ec5a1f3115a9eb7a86f25d1a4610227c6 /arch/parisc/kernel/process.c | |
| parent | cpuidle/pseries: Fix fallout caused due to cleanup in pseries cpuidle backend... (diff) | |
| parent | Merge tag 'pci-v3.14-fixes-1' of git://git.kernel.org/pub/scm/linux/kernel/gi... (diff) | |
| download | linux-d97a860c4f3de98ba5040a22f305b7159fe17cff.tar.xz linux-d97a860c4f3de98ba5040a22f305b7159fe17cff.zip | |
Merge branch 'linus' into sched/core
Reason: Bring bakc upstream modification to resolve conflicts
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'arch/parisc/kernel/process.c')
| -rw-r--r-- | arch/parisc/kernel/process.c | 21 |
1 files changed, 20 insertions, 1 deletions
diff --git a/arch/parisc/kernel/process.c b/arch/parisc/kernel/process.c index 55f92b614182..0bbbf0d3f608 100644 --- a/arch/parisc/kernel/process.c +++ b/arch/parisc/kernel/process.c @@ -13,7 +13,7 @@ * Copyright (C) 2000 Grant Grundler <grundler with parisc-linux.org> * Copyright (C) 2001 Alan Modra <amodra at parisc-linux.org> * Copyright (C) 2001-2002 Ryan Bradetich <rbrad at parisc-linux.org> - * Copyright (C) 2001-2007 Helge Deller <deller at parisc-linux.org> + * Copyright (C) 2001-2014 Helge Deller <deller@gmx.de> * Copyright (C) 2002 Randolph Chung <tausq with parisc-linux.org> * * @@ -49,6 +49,7 @@ #include <linux/kallsyms.h> #include <linux/uaccess.h> #include <linux/rcupdate.h> +#include <linux/random.h> #include <asm/io.h> #include <asm/asm-offsets.h> @@ -286,3 +287,21 @@ void *dereference_function_descriptor(void *ptr) return ptr; } #endif + +static inline unsigned long brk_rnd(void) +{ + /* 8MB for 32bit, 1GB for 64bit */ + if (is_32bit_task()) + return (get_random_int() & 0x7ffUL) << PAGE_SHIFT; + else + return (get_random_int() & 0x3ffffUL) << PAGE_SHIFT; +} + +unsigned long arch_randomize_brk(struct mm_struct *mm) +{ + unsigned long ret = PAGE_ALIGN(mm->brk + brk_rnd()); + + if (ret < mm->brk) + return mm->brk; + return ret; +} |