From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: linux-kernel@vger.kernel.org
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
stable@vger.kernel.org, Kees Cook <keescook@google.com>,
Thomas Gleixner <tglx@linutronix.de>,
Peter Zijlstra <peterz@infradead.org>,
Andy Lutomirski <luto@kernel.org>,
Thomas Backlund <tmb@mageia.org>
Subject: [PATCH 4.9 20/21] x86/tlb: Drop the _GPL from the cpu_tlbstate export
Date: Mon, 8 Jan 2018 13:59:40 +0100 [thread overview]
Message-ID: <20180108125921.245797374@linuxfoundation.org> (raw)
In-Reply-To: <20180108125920.106264989@linuxfoundation.org>
4.9-stable review patch. If anyone has any objections, please let me know.
------------------
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>
Cc: Thomas Backlund <tmb@mageia.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
@@ -768,7 +768,7 @@ DEFINE_PER_CPU_SHARED_ALIGNED(struct tlb
.state = 0,
.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)
{
next prev parent reply other threads:[~2018-01-08 12:59 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-01-08 12:59 [PATCH 4.9 00/21] 4.9.76-stable review Greg Kroah-Hartman
2018-01-08 12:59 ` [PATCH 4.9 01/21] kernel/acct.c: fix the acct->needcheck check in check_free_space() Greg Kroah-Hartman
2018-01-08 12:59 ` [PATCH 4.9 02/21] crypto: n2 - cure use after free Greg Kroah-Hartman
2018-01-08 12:59 ` [PATCH 4.9 03/21] crypto: chacha20poly1305 - validate the digest size Greg Kroah-Hartman
2018-01-08 12:59 ` [PATCH 4.9 04/21] crypto: pcrypt - fix freeing pcrypt instances Greg Kroah-Hartman
2018-01-08 12:59 ` [PATCH 4.9 06/21] fscache: Fix the default for fscache_maybe_release_page() Greg Kroah-Hartman
2018-01-08 12:59 ` [PATCH 4.9 07/21] nbd: fix use-after-free of rq/bio in the xmit path Greg Kroah-Hartman
2018-01-08 12:59 ` [PATCH 4.9 08/21] kernel: make groups_sort calling a responsibility group_info allocators Greg Kroah-Hartman
2018-01-08 12:59 ` [PATCH 4.9 09/21] kernel/signal.c: protect the traced SIGNAL_UNKILLABLE tasks from SIGKILL Greg Kroah-Hartman
2018-01-08 12:59 ` [PATCH 4.9 10/21] kernel/signal.c: protect the SIGNAL_UNKILLABLE tasks from !sig_kernel_only() signals Greg Kroah-Hartman
2018-01-08 12:59 ` [PATCH 4.9 11/21] kernel/signal.c: remove the no longer needed SIGNAL_UNKILLABLE check in complete_signal() Greg Kroah-Hartman
2018-01-08 12:59 ` [PATCH 4.9 12/21] iommu/arm-smmu-v3: Dont free page table ops twice Greg Kroah-Hartman
2018-01-08 12:59 ` [PATCH 4.9 13/21] iommu/arm-smmu-v3: Cope with duplicated Stream IDs Greg Kroah-Hartman
2018-01-08 12:59 ` [PATCH 4.9 14/21] ARC: uaccess: dont use "l" gcc inline asm constraint modifier Greg Kroah-Hartman
2018-01-08 12:59 ` [PATCH 4.9 15/21] Input: elantech - add new icbody type 15 Greg Kroah-Hartman
2018-01-08 12:59 ` [PATCH 4.9 16/21] x86/microcode/AMD: Add support for fam17h microcode loading Greg Kroah-Hartman
2018-01-08 12:59 ` [PATCH 4.9 17/21] parisc: Fix alignment of pa_tlb_lock in assembly on 32-bit SMP kernel Greg Kroah-Hartman
2018-01-08 12:59 ` [PATCH 4.9 18/21] parisc: qemu idle sleep support Greg Kroah-Hartman
2018-01-08 12:59 ` Greg Kroah-Hartman [this message]
2018-01-08 12:59 ` [PATCH 4.9 21/21] Map the vsyscall page with _PAGE_USER Greg Kroah-Hartman
2018-01-08 20:59 ` [PATCH 4.9 00/21] 4.9.76-stable review Shuah Khan
2018-01-09 11:59 ` Naresh Kamboju
2018-01-09 12:42 ` Greg Kroah-Hartman
2018-01-09 13:45 ` Guenter Roeck
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