This is a note to let you know that I've just added the patch titled
x86/tlb: Drop the _GPL from the cpu_tlbstate export
to the 4.14-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git%3Ba=su...
The filename of the patch is: x86-tlb-drop-the-_gpl-from-the-cpu_tlbstate-export.patch and it can be found in the queue-4.14 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree, please let stable@vger.kernel.org know about it.
From 1e5476815fd7f98b888e01a0f9522b63085f96c9 Mon Sep 17 00:00:00 2001
From: Thomas Gleixner tglx@linutronix.de Date: Thu, 4 Jan 2018 22:19:04 +0100 Subject: x86/tlb: Drop the _GPL from the cpu_tlbstate export
From: Thomas Gleixner tglx@linutronix.de
commit 1e5476815fd7f98b888e01a0f9522b63085f96c9 upstream.
The recent changes for PTI touch cpu_tlbstate from various tlb_flush inlines. cpu_tlbstate is exported as GPL symbol, so this causes a regression when building out of tree drivers for certain graphics cards.
Aside of that the export was wrong since it was introduced as it should have been EXPORT_PER_CPU_SYMBOL_GPL().
Use the correct PER_CPU export and drop the _GPL to restore the previous state which allows users to utilize the cards they payed for.
As always I'm really thrilled to make this kind of change to support the #friends (or however the hot hashtag of today is spelled) from that closet sauce graphics corp.
Fixes: 1e02ce4cccdc ("x86: Store a per-cpu shadow copy of CR4") Fixes: 6fd166aae78c ("x86/mm: Use/Fix PCID to optimize user/kernel switches") Reported-by: Kees Cook keescook@google.com Signed-off-by: Thomas Gleixner tglx@linutronix.de Cc: Greg Kroah-Hartman gregkh@linuxfoundation.org Cc: Peter Zijlstra peterz@infradead.org Cc: Andy Lutomirski luto@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- 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 @@ -870,7 +870,7 @@ __visible DEFINE_PER_CPU_SHARED_ALIGNED( .next_asid = 1, .cr4 = ~0UL, /* fail hard if we screw up cr4 shadow initialization */ }; -EXPORT_SYMBOL_GPL(cpu_tlbstate); +EXPORT_PER_CPU_SYMBOL(cpu_tlbstate);
void update_cache_mode_entry(unsigned entry, enum page_cache_mode cache) {
Patches currently in stable-queue which might be from tglx@linutronix.de are
queue-4.14/x86-tlb-drop-the-_gpl-from-the-cpu_tlbstate-export.patch queue-4.14/x86-alternatives-add-missing-n-at-end-of-alternative-inline-asm.patch queue-4.14/x86-kaslr-fix-the-vaddr_end-mess.patch queue-4.14/efi-capsule-loader-reinstate-virtual-capsule-mapping.patch queue-4.14/x86-mm-set-modules_end-to-0xffffffffff000000.patch queue-4.14/mm-sparse.c-wrong-allocation-for-mem_section.patch queue-4.14/x86-events-intel-ds-use-the-proper-cache-flush-method-for-mapping-ds-buffers.patch queue-4.14/x86-pti-rename-bug_cpu_insecure-to-bug_cpu_meltdown.patch queue-4.14/x86-mm-map-cpu_entry_area-at-the-same-place-on-4-5-level.patch