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Message-Id: <20171204155942.406528511@linuxfoundation.org>
Date: Mon, 4 Dec 2017 16:59:28 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-kernel@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
stable@...r.kernel.org, Matt Fleming <matt@...eblueprint.co.uk>,
Borislav Petkov <bp@...e.de>,
Andy Lutomirski <luto@...capital.net>,
Ard Biesheuvel <ard.biesheuvel@...aro.org>,
Borislav Petkov <bp@...en8.de>,
Brian Gerst <brgerst@...il.com>,
Dave Hansen <dave.hansen@...el.com>,
Denys Vlasenko <dvlasenk@...hat.com>,
"H. Peter Anvin" <hpa@...or.com>,
Linus Torvalds <torvalds@...ux-foundation.org>,
Peter Zijlstra <peterz@...radead.org>,
Sai Praneeth Prakhya <sai.praneeth.prakhya@...el.com>,
Thomas Gleixner <tglx@...utronix.de>,
Toshi Kani <toshi.kani@...com>, linux-efi@...r.kernel.org,
Ingo Molnar <mingo@...nel.org>,
"Ghannam, Yazen" <Yazen.Ghannam@....com>
Subject: [PATCH 4.4 03/27] x86/mm/pat: Ensure cpa->pfn only contains page frame numbers
4.4-stable review patch. If anyone has any objections, please let me know.
------------------
From: Matt Fleming <matt@...eblueprint.co.uk>
commit edc3b9129cecd0f0857112136f5b8b1bc1d45918 upstream.
The x86 pageattr code is confused about the data that is stored
in cpa->pfn, sometimes it's treated as a page frame number,
sometimes it's treated as an unshifted physical address, and in
one place it's treated as a pte.
The result of this is that the mapping functions do not map the
intended physical address.
This isn't a problem in practice because most of the addresses
we're mapping in the EFI code paths are already mapped in
'trampoline_pgd' and so the pageattr mapping functions don't
actually do anything in this case. But when we move to using a
separate page table for the EFI runtime this will be an issue.
Signed-off-by: Matt Fleming <matt@...eblueprint.co.uk>
Reviewed-by: Borislav Petkov <bp@...e.de>
Acked-by: Borislav Petkov <bp@...e.de>
Cc: Andy Lutomirski <luto@...capital.net>
Cc: Ard Biesheuvel <ard.biesheuvel@...aro.org>
Cc: Borislav Petkov <bp@...en8.de>
Cc: Brian Gerst <brgerst@...il.com>
Cc: Dave Hansen <dave.hansen@...el.com>
Cc: Denys Vlasenko <dvlasenk@...hat.com>
Cc: H. Peter Anvin <hpa@...or.com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Sai Praneeth Prakhya <sai.praneeth.prakhya@...el.com>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Toshi Kani <toshi.kani@...com>
Cc: linux-efi@...r.kernel.org
Link: http://lkml.kernel.org/r/1448658575-17029-3-git-send-email-matt@codeblueprint.co.uk
Signed-off-by: Ingo Molnar <mingo@...nel.org>
Cc: "Ghannam, Yazen" <Yazen.Ghannam@....com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
arch/x86/mm/pageattr.c | 17 ++++++-----------
arch/x86/platform/efi/efi_64.c | 16 ++++++++++------
2 files changed, 16 insertions(+), 17 deletions(-)
--- a/arch/x86/mm/pageattr.c
+++ b/arch/x86/mm/pageattr.c
@@ -911,15 +911,10 @@ static void populate_pte(struct cpa_data
pte = pte_offset_kernel(pmd, start);
while (num_pages-- && start < end) {
-
- /* deal with the NX bit */
- if (!(pgprot_val(pgprot) & _PAGE_NX))
- cpa->pfn &= ~_PAGE_NX;
-
- set_pte(pte, pfn_pte(cpa->pfn >> PAGE_SHIFT, pgprot));
+ set_pte(pte, pfn_pte(cpa->pfn, pgprot));
start += PAGE_SIZE;
- cpa->pfn += PAGE_SIZE;
+ cpa->pfn++;
pte++;
}
}
@@ -975,11 +970,11 @@ static int populate_pmd(struct cpa_data
pmd = pmd_offset(pud, start);
- set_pmd(pmd, __pmd(cpa->pfn | _PAGE_PSE |
+ set_pmd(pmd, __pmd(cpa->pfn << PAGE_SHIFT | _PAGE_PSE |
massage_pgprot(pmd_pgprot)));
start += PMD_SIZE;
- cpa->pfn += PMD_SIZE;
+ cpa->pfn += PMD_SIZE >> PAGE_SHIFT;
cur_pages += PMD_SIZE >> PAGE_SHIFT;
}
@@ -1048,11 +1043,11 @@ static int populate_pud(struct cpa_data
* Map everything starting from the Gb boundary, possibly with 1G pages
*/
while (end - start >= PUD_SIZE) {
- set_pud(pud, __pud(cpa->pfn | _PAGE_PSE |
+ set_pud(pud, __pud(cpa->pfn << PAGE_SHIFT | _PAGE_PSE |
massage_pgprot(pud_pgprot)));
start += PUD_SIZE;
- cpa->pfn += PUD_SIZE;
+ cpa->pfn += PUD_SIZE >> PAGE_SHIFT;
cur_pages += PUD_SIZE >> PAGE_SHIFT;
pud++;
}
--- a/arch/x86/platform/efi/efi_64.c
+++ b/arch/x86/platform/efi/efi_64.c
@@ -143,7 +143,7 @@ void efi_sync_low_kernel_mappings(void)
int __init efi_setup_page_tables(unsigned long pa_memmap, unsigned num_pages)
{
- unsigned long text;
+ unsigned long pfn, text;
struct page *page;
unsigned npages;
pgd_t *pgd;
@@ -160,7 +160,8 @@ int __init efi_setup_page_tables(unsigne
* and ident-map those pages containing the map before calling
* phys_efi_set_virtual_address_map().
*/
- if (kernel_map_pages_in_pgd(pgd, pa_memmap, pa_memmap, num_pages, _PAGE_NX)) {
+ pfn = pa_memmap >> PAGE_SHIFT;
+ if (kernel_map_pages_in_pgd(pgd, pfn, pa_memmap, num_pages, _PAGE_NX)) {
pr_err("Error ident-mapping new memmap (0x%lx)!\n", pa_memmap);
return 1;
}
@@ -185,8 +186,9 @@ int __init efi_setup_page_tables(unsigne
npages = (_end - _text) >> PAGE_SHIFT;
text = __pa(_text);
+ pfn = text >> PAGE_SHIFT;
- if (kernel_map_pages_in_pgd(pgd, text >> PAGE_SHIFT, text, npages, 0)) {
+ if (kernel_map_pages_in_pgd(pgd, pfn, text, npages, 0)) {
pr_err("Failed to map kernel text 1:1\n");
return 1;
}
@@ -204,12 +206,14 @@ void __init efi_cleanup_page_tables(unsi
static void __init __map_region(efi_memory_desc_t *md, u64 va)
{
pgd_t *pgd = (pgd_t *)__va(real_mode_header->trampoline_pgd);
- unsigned long pf = 0;
+ unsigned long flags = 0;
+ unsigned long pfn;
if (!(md->attribute & EFI_MEMORY_WB))
- pf |= _PAGE_PCD;
+ flags |= _PAGE_PCD;
- if (kernel_map_pages_in_pgd(pgd, md->phys_addr, va, md->num_pages, pf))
+ pfn = md->phys_addr >> PAGE_SHIFT;
+ if (kernel_map_pages_in_pgd(pgd, pfn, va, md->num_pages, flags))
pr_warn("Error mapping PA 0x%llx -> VA 0x%llx!\n",
md->phys_addr, va);
}
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