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authorJan Beulich <JBeulich@suse.com>2016-01-26 04:15:18 -0700
committerThomas Gleixner <tglx@linutronix.de>2016-01-26 21:05:36 +0100
commit3625c2c234ef66acf21a72d47a5ffa94f6c5ebf2 (patch)
treeb156bf1125ef39a008ed5ccdfea2f046f014435d /arch/x86
parent22c43f36b5cf22a7e4506cb3a53f3ad2a43f60f7 (diff)
x86/mm: Fix types used in pgprot cacheability flags translations
For PAE kernels "unsigned long" is not suitable to hold page protection flags, since _PAGE_NX doesn't fit there. This is the reason for quite a few W+X pages getting reported as insecure during boot (observed namely for the entire initrd range). Fixes: 281d4078be ("x86: Make page cache mode a real type") Signed-off-by: Jan Beulich <jbeulich@suse.com> Reviewed-by: Juergen Gross <JGross@suse.com> Cc: stable@vger.kernel.org Link: http://lkml.kernel.org/r/56A7635602000078000CAFF1@prv-mh.provo.novell.com Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'arch/x86')
-rw-r--r--arch/x86/include/asm/pgtable_types.h6
1 files changed, 2 insertions, 4 deletions
diff --git a/arch/x86/include/asm/pgtable_types.h b/arch/x86/include/asm/pgtable_types.h
index a471cadb9630..79c91853e50e 100644
--- a/arch/x86/include/asm/pgtable_types.h
+++ b/arch/x86/include/asm/pgtable_types.h
@@ -363,20 +363,18 @@ static inline enum page_cache_mode pgprot2cachemode(pgprot_t pgprot)
}
static inline pgprot_t pgprot_4k_2_large(pgprot_t pgprot)
{
+ pgprotval_t val = pgprot_val(pgprot);
pgprot_t new;
- unsigned long val;
- val = pgprot_val(pgprot);
pgprot_val(new) = (val & ~(_PAGE_PAT | _PAGE_PAT_LARGE)) |
((val & _PAGE_PAT) << (_PAGE_BIT_PAT_LARGE - _PAGE_BIT_PAT));
return new;
}
static inline pgprot_t pgprot_large_2_4k(pgprot_t pgprot)
{
+ pgprotval_t val = pgprot_val(pgprot);
pgprot_t new;
- unsigned long val;
- val = pgprot_val(pgprot);
pgprot_val(new) = (val & ~(_PAGE_PAT | _PAGE_PAT_LARGE)) |
((val & _PAGE_PAT_LARGE) >>
(_PAGE_BIT_PAT_LARGE - _PAGE_BIT_PAT));