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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
hifive-unleashed-5.1
H. Peter Anvin 2012-09-21 12:43:06 -07:00
parent 05194cfc54
commit 8bd753be7a
1 changed files with 1 additions and 1 deletions
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arch/x86/mm/init_32.c
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@ -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);