[tip:x86/smap] x86-32, mm: The WP test should be done on a kernel page

[tip-bot for H. Peter Anvin]

Commit-ID:  8bd753be7a96443dd5111cb07ed5907a3787c978
Gitweb:     http://git.kernel.org/tip/8bd753be7a96443dd5111cb07ed5907a3787c978
Author:     H. Peter Anvin <hpa@xxxxxxxxxxxxxxx>
AuthorDate: Fri, 21 Sep 2012 12:43:06 -0700
Committer:  H. Peter Anvin <hpa@xxxxxxxxxxxxxxx>
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@xxxxxxxxxxxxxxx>
Link: http://lkml.kernel.org/r/1348256595-29119-3-git-send-email-hpa@xxxxxxxxxxxxxxx
---
 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);
 
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/