lkml.org 
[lkml]   [2012]   [Sep]   [21]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
Date
From
Subject[tip:x86/smap] x86-32, mm: The WP test should be done on a kernel page
Commit-ID:  8bd753be7a96443dd5111cb07ed5907a3787c978
Gitweb: http://git.kernel.org/tip/8bd753be7a96443dd5111cb07ed5907a3787c978
Author: H. Peter Anvin <hpa@linux.intel.com>
AuthorDate: Fri, 21 Sep 2012 12:43:06 -0700
Committer: H. Peter Anvin <hpa@linux.intel.com>
CommitDate: Fri, 21 Sep 2012 12:45:25 -0700

x86-32, mm: The WP test should be done on a kernel page

PAGE_READONLY includes user permission, but this is a page used
exclusively by the kernel; use PAGE_KERNEL_RO instead.

Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
Link: http://lkml.kernel.org/r/1348256595-29119-3-git-send-email-hpa@linux.intel.com
---
arch/x86/mm/init_32.c | 2 +-
1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/arch/x86/mm/init_32.c b/arch/x86/mm/init_32.c
index 575d86f..e537b35 100644
--- a/arch/x86/mm/init_32.c
+++ b/arch/x86/mm/init_32.c
@@ -712,7 +712,7 @@ static void __init test_wp_bit(void)
"Checking if this processor honours the WP bit even in supervisor mode...");

/* Any page-aligned address will do, the test is non-destructive */
- __set_fixmap(FIX_WP_TEST, __pa(&swapper_pg_dir), PAGE_READONLY);
+ __set_fixmap(FIX_WP_TEST, __pa(&swapper_pg_dir), PAGE_KERNEL_RO);
boot_cpu_data.wp_works_ok = do_test_wp_bit();
clear_fixmap(FIX_WP_TEST);


\
 
 \ /
  Last update: 2012-09-21 22:21    [W:0.163 / U:0.152 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site