Messages in this thread Patch in this message | | | From | Ben Hutchings <> | Date | Sun, 16 Jul 2017 14:56:38 +0100 | Subject | [PATCH 3.2 89/95] x86/mm/init.c: Fix devmem_is_allowed() off by one |
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3.2.91-rc1 review patch. If anyone has any objections, please let me know.
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From: T Makphaibulchoke <tmac@hp.com>
commit 73e8f3d7e2cb23614d5115703d76d8e54764b641 upstream.
Fixing an off-by-one error in devmem_is_allowed(), which allows accesses to physical addresses 0x100000-0x100fff, an extra page past 1MB.
Signed-off-by: T Makphaibulchoke <tmac@hp.com> Acked-by: H. Peter Anvin <hpa@zytor.com> Cc: yinghai@kernel.org Cc: tiwai@suse.de Cc: dhowells@redhat.com Link: http://lkml.kernel.org/r/1346210503-14276-1-git-send-email-tmac@hp.com Signed-off-by: Ingo Molnar <mingo@kernel.org> Signed-off-by: Ben Hutchings <ben@decadent.org.uk> --- arch/x86/mm/init.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/arch/x86/mm/init.c +++ b/arch/x86/mm/init.c @@ -326,7 +326,7 @@ unsigned long __init_refok init_memory_m */ int devmem_is_allowed(unsigned long pagenr) { - if (pagenr <= 256) + if (pagenr < 256) return 1; if (iomem_is_exclusive(pagenr << PAGE_SHIFT)) return 0;
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