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pve-kernel-qoup/patches/kernel/0117-ACPI-APEI-Replace-ioremap_page_range-with-fixmap.patch
Fabian Grünbichler 633c5ed17f revert buggy SCSI error handler commit 
this causes kernel OOPS and upstream is unresponsive about it.

see https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1726519
2018-01-08 11:51:24 +01:00

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From c18bf2e2bd1efc5430965d0110a8dfc4a25d84ad Mon Sep 17 00:00:00 2001
From: James Morse <james.morse@arm.com>
Date: Mon, 6 Nov 2017 18:44:24 +0000
Subject: [PATCH 117/242] ACPI / APEI: Replace ioremap_page_range() with fixmap
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
CVE-2017-5754
Replace ghes_io{re,un}map_pfn_{nmi,irq}()s use of ioremap_page_range()
with __set_fixmap() as ioremap_page_range() may sleep to allocate a new
level of page-table, even if its passed an existing final-address to
use in the mapping.
The GHES driver can only be enabled for architectures that select
HAVE_ACPI_APEI: Add fixmap entries to both x86 and arm64.
clear_fixmap() does the TLB invalidation in __set_fixmap() for arm64
and __set_pte_vaddr() for x86. In each case its the same as the
respective arch_apei_flush_tlb_one().
Reported-by: Fengguang Wu <fengguang.wu@intel.com>
Suggested-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: James Morse <james.morse@arm.com>
Reviewed-by: Borislav Petkov <bp@suse.de>
Tested-by: Tyler Baicar <tbaicar@codeaurora.org>
Tested-by: Toshi Kani <toshi.kani@hpe.com>
[ For the arm64 bits: ]
Acked-by: Will Deacon <will.deacon@arm.com>
[ For the x86 bits: ]
Acked-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Cc: All applicable <stable@vger.kernel.org>
(cherry picked from commit 4f89fa286f6729312e227e7c2d764e8e7b9d340e)
Signed-off-by: Andy Whitcroft <apw@canonical.com>
Signed-off-by: Kleber Sacilotto de Souza <kleber.souza@canonical.com>
(cherry picked from commit eda363b23c1601f733cb1d7d66d1a4975c4c5d09)
Signed-off-by: Fabian Grünbichler <f.gruenbichler@proxmox.com>
---
arch/arm64/include/asm/fixmap.h | 7 +++++++
arch/x86/include/asm/fixmap.h | 6 ++++++
drivers/acpi/apei/ghes.c | 44 +++++++++++++----------------------------
3 files changed, 27 insertions(+), 30 deletions(-)
diff --git a/arch/arm64/include/asm/fixmap.h b/arch/arm64/include/asm/fixmap.h
index caf86be815ba..4052ec39e8db 100644
--- a/arch/arm64/include/asm/fixmap.h
+++ b/arch/arm64/include/asm/fixmap.h
@@ -51,6 +51,13 @@ enum fixed_addresses {
FIX_EARLYCON_MEM_BASE,
FIX_TEXT_POKE0,
+
+#ifdef CONFIG_ACPI_APEI_GHES
+ /* Used for GHES mapping from assorted contexts */
+ FIX_APEI_GHES_IRQ,
+ FIX_APEI_GHES_NMI,
+#endif /* CONFIG_ACPI_APEI_GHES */
+
__end_of_permanent_fixed_addresses,
/*
diff --git a/arch/x86/include/asm/fixmap.h b/arch/x86/include/asm/fixmap.h
index b65155cc3760..81c2b11f50a6 100644
--- a/arch/x86/include/asm/fixmap.h
+++ b/arch/x86/include/asm/fixmap.h
@@ -104,6 +104,12 @@ enum fixed_addresses {
FIX_GDT_REMAP_BEGIN,
FIX_GDT_REMAP_END = FIX_GDT_REMAP_BEGIN + NR_CPUS - 1,
+#ifdef CONFIG_ACPI_APEI_GHES
+ /* Used for GHES mapping from assorted contexts */
+ FIX_APEI_GHES_IRQ,
+ FIX_APEI_GHES_NMI,
+#endif
+
__end_of_permanent_fixed_addresses,
/*
diff --git a/drivers/acpi/apei/ghes.c b/drivers/acpi/apei/ghes.c
index 4827176f838d..f9f106e62e74 100644
--- a/drivers/acpi/apei/ghes.c
+++ b/drivers/acpi/apei/ghes.c
@@ -51,6 +51,7 @@
#include <acpi/actbl1.h>
#include <acpi/ghes.h>
#include <acpi/apei.h>
+#include <asm/fixmap.h>
#include <asm/tlbflush.h>
#include <ras/ras_event.h>
@@ -112,7 +113,7 @@ static DEFINE_MUTEX(ghes_list_mutex);
* Because the memory area used to transfer hardware error information
* from BIOS to Linux can be determined only in NMI, IRQ or timer
* handler, but general ioremap can not be used in atomic context, so
- * a special version of atomic ioremap is implemented for that.
+ * the fixmap is used instead.
*/
/*
@@ -126,8 +127,8 @@ static DEFINE_MUTEX(ghes_list_mutex);
/* virtual memory area for atomic ioremap */
static struct vm_struct *ghes_ioremap_area;
/*
- * These 2 spinlock is used to prevent atomic ioremap virtual memory
- * area from being mapped simultaneously.
+ * These 2 spinlocks are used to prevent the fixmap entries from being used
+ * simultaneously.
*/
static DEFINE_RAW_SPINLOCK(ghes_ioremap_lock_nmi);
static DEFINE_SPINLOCK(ghes_ioremap_lock_irq);
@@ -159,53 +160,36 @@ static void ghes_ioremap_exit(void)
static void __iomem *ghes_ioremap_pfn_nmi(u64 pfn)
{
- unsigned long vaddr;
phys_addr_t paddr;
pgprot_t prot;
- vaddr = (unsigned long)GHES_IOREMAP_NMI_PAGE(ghes_ioremap_area->addr);
-
paddr = pfn << PAGE_SHIFT;
prot = arch_apei_get_mem_attribute(paddr);
- ioremap_page_range(vaddr, vaddr + PAGE_SIZE, paddr, prot);
+ __set_fixmap(FIX_APEI_GHES_NMI, paddr, prot);
- return (void __iomem *)vaddr;
+ return (void __iomem *) fix_to_virt(FIX_APEI_GHES_NMI);
}
static void __iomem *ghes_ioremap_pfn_irq(u64 pfn)
{
- unsigned long vaddr;
phys_addr_t paddr;
pgprot_t prot;
- vaddr = (unsigned long)GHES_IOREMAP_IRQ_PAGE(ghes_ioremap_area->addr);
-
paddr = pfn << PAGE_SHIFT;
prot = arch_apei_get_mem_attribute(paddr);
+ __set_fixmap(FIX_APEI_GHES_IRQ, paddr, prot);
- ioremap_page_range(vaddr, vaddr + PAGE_SIZE, paddr, prot);
-
- return (void __iomem *)vaddr;
+ return (void __iomem *) fix_to_virt(FIX_APEI_GHES_IRQ);
}
-static void ghes_iounmap_nmi(void __iomem *vaddr_ptr)
+static void ghes_iounmap_nmi(void)
{
- unsigned long vaddr = (unsigned long __force)vaddr_ptr;
- void *base = ghes_ioremap_area->addr;
-
- BUG_ON(vaddr != (unsigned long)GHES_IOREMAP_NMI_PAGE(base));
- unmap_kernel_range_noflush(vaddr, PAGE_SIZE);
- arch_apei_flush_tlb_one(vaddr);
+ clear_fixmap(FIX_APEI_GHES_NMI);
}
-static void ghes_iounmap_irq(void __iomem *vaddr_ptr)
+static void ghes_iounmap_irq(void)
{
- unsigned long vaddr = (unsigned long __force)vaddr_ptr;
- void *base = ghes_ioremap_area->addr;
-
- BUG_ON(vaddr != (unsigned long)GHES_IOREMAP_IRQ_PAGE(base));
- unmap_kernel_range_noflush(vaddr, PAGE_SIZE);
- arch_apei_flush_tlb_one(vaddr);
+ clear_fixmap(FIX_APEI_GHES_IRQ);
}
static int ghes_estatus_pool_init(void)
@@ -361,10 +345,10 @@ static void ghes_copy_tofrom_phys(void *buffer, u64 paddr, u32 len,
paddr += trunk;
buffer += trunk;
if (in_nmi) {
- ghes_iounmap_nmi(vaddr);
+ ghes_iounmap_nmi();
raw_spin_unlock(&ghes_ioremap_lock_nmi);
} else {
- ghes_iounmap_irq(vaddr);
+ ghes_iounmap_irq();
spin_unlock_irqrestore(&ghes_ioremap_lock_irq, flags);
}
}
--
2.14.2
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