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authorWill Deacon <will.deacon@arm.com>2012-09-18 19:18:35 +0100
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2013-01-11 09:03:48 -0800
commitf61019b8f7253ee77cebe22e9ff58865d16378a7 (patch)
treed22ff60bd98c1c970393e2f273fb42059192c21a /arch
parent8d15569e14cfcf9151e9e3b4c0cb98369943a2bb (diff)
ARM: mm: use pteval_t to represent page protection values
commit 864aa04cd02979c2c755cb28b5f4fe56039171c0 upstream. When updating the page protection map after calculating the user_pgprot value, the base protection map is temporarily stored in an unsigned long type, causing truncation of the protection bits when LPAE is enabled. This effectively means that calls to mprotect() will corrupt the upper page attributes, clearing the XN bit unconditionally. This patch uses pteval_t to store the intermediate protection values, preserving the upper bits for 64-bit descriptors. Acked-by: Nicolas Pitre <nico@linaro.org> Acked-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'arch')
-rw-r--r--arch/arm/mm/mmu.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/arm/mm/mmu.c b/arch/arm/mm/mmu.c
index 594d677b92c8..19d9369bd75c 100644
--- a/arch/arm/mm/mmu.c
+++ b/arch/arm/mm/mmu.c
@@ -467,7 +467,7 @@ static void __init build_mem_type_table(void)
}
for (i = 0; i < 16; i++) {
- unsigned long v = pgprot_val(protection_map[i]);
+ pteval_t v = pgprot_val(protection_map[i]);
protection_map[i] = __pgprot(v | user_pgprot);
}