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Commit 8bd753be authored by H. Peter Anvin's avatar H. Peter Anvin
Browse files

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: default avatarH. Peter Anvin <hpa@linux.intel.com>
Link: http://lkml.kernel.org/r/1348256595-29119-3-git-send-email-hpa@linux.intel.com
parent 05194cfc

arch/x86/mm/init_32.c

+1 −1
Original line number Diff line number Diff line
@@ -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);