From: Jason Cooper <jason@lakedaemon.net>
Date: Sat, 10 Sep 2016 10:34:29 +0000 (+1000)
Subject: unicore32: use simpler API for random address requests
X-Git-Url: http://drtracing.org/?a=commitdiff_plain;h=8cb4aba572912ff4fa48aa0a46f468ece62e0c8c;p=deliverable%2Flinux.git

unicore32: use simpler API for random address requests

Currently, all callers to randomize_range() set the length to 0 and
calculate end by adding a constant to the start address.  We can simplify
the API to remove a bunch of needless checks and variables.

Use the new randomize_addr(start, range) call to set the requested
address.

Link: http://lkml.kernel.org/r/20160803233913.32511-7-jason@lakedaemon.net
Signed-off-by: Jason Cooper <jason@lakedaemon.net>
Acked-by: Kees Cook <keescook@chromium.org>
Cc: "Theodore Ts'o" <tytso@mit.edu>
Cc: Guan Xuetao <gxt@mprc.pku.edu.cn>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

diff --git a/arch/unicore32/kernel/process.c b/arch/unicore32/kernel/process.c
index 00299c927852..d7c6b676b3a5 100644
--- a/arch/unicore32/kernel/process.c
+++ b/arch/unicore32/kernel/process.c
@@ -295,8 +295,7 @@ unsigned long get_wchan(struct task_struct *p)
 
 unsigned long arch_randomize_brk(struct mm_struct *mm)
 {
-	unsigned long range_end = mm->brk + 0x02000000;
-	return randomize_range(mm->brk, range_end, 0) ? : mm->brk;
+	return randomize_page(mm->brk, 0x02000000);
 }
 
 /*