| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Date: Thu, 3 Jan 2008 16:24:22 +0100 (CET)
From: Andi Kleen <ak@...e.de>
To: linux-kernel@...r.kernel.org
Subject: [PATCH CPA] [8/28] CPA: Return the page table level in lookup_address()
Needed for the next change.
And change all the callers.
Signed-off-by: Andi Kleen <ak@...e.de>
---
arch/x86/mm/fault_32.c | 3 ++-
arch/x86/mm/init_32.c | 3 ++-
arch/x86/mm/pageattr_32.c | 7 +++++--
arch/x86/mm/pageattr_64.c | 7 +++++--
arch/x86/xen/mmu.c | 9 ++++++---
include/asm-x86/pgtable_32.h | 2 +-
include/asm-x86/pgtable_64.h | 2 +-
7 files changed, 22 insertions(+), 11 deletions(-)
Index: linux/arch/x86/mm/pageattr_64.c
===================================================================
--- linux.orig/arch/x86/mm/pageattr_64.c
+++ linux/arch/x86/mm/pageattr_64.c
@@ -13,7 +13,7 @@
#include <asm/tlbflush.h>
#include <asm/io.h>
-pte_t *lookup_address(unsigned long address)
+pte_t *lookup_address(unsigned long address, int *level)
{
pgd_t *pgd = pgd_offset_k(address);
pud_t *pud;
@@ -27,8 +27,10 @@ pte_t *lookup_address(unsigned long addr
pmd = pmd_offset(pud, address);
if (!pmd_present(*pmd))
return NULL;
+ *level = 3;
if (pmd_large(*pmd))
return (pte_t *)pmd;
+ *level = 4;
pte = pte_offset_kernel(pmd, address);
if (pte && !pte_present(*pte))
pte = NULL;
@@ -129,8 +131,9 @@ __change_page_attr(unsigned long address
pte_t *kpte;
struct page *kpte_page;
pgprot_t ref_prot2;
+ int level;
- kpte = lookup_address(address);
+ kpte = lookup_address(address, &level);
if (!kpte) return 0;
kpte_page = virt_to_page(((unsigned long)kpte) & PAGE_MASK);
BUG_ON(PageLRU(kpte_page));
Index: linux/include/asm-x86/pgtable_64.h
===================================================================
--- linux.orig/include/asm-x86/pgtable_64.h
+++ linux/include/asm-x86/pgtable_64.h
@@ -409,7 +409,7 @@ extern struct list_head pgd_list;
extern int kern_addr_valid(unsigned long addr);
-pte_t *lookup_address(unsigned long addr);
+pte_t *lookup_address(unsigned long addr, int *level);
#define io_remap_pfn_range(vma, vaddr, pfn, size, prot) \
remap_pfn_range(vma, vaddr, pfn, size, prot)
Index: linux/arch/x86/mm/pageattr_32.c
===================================================================
--- linux.orig/arch/x86/mm/pageattr_32.c
+++ linux/arch/x86/mm/pageattr_32.c
@@ -18,7 +18,7 @@ static DEFINE_SPINLOCK(cpa_lock);
static struct list_head df_list = LIST_HEAD_INIT(df_list);
-pte_t *lookup_address(unsigned long address)
+pte_t *lookup_address(unsigned long address, int *level)
{
pgd_t *pgd = pgd_offset_k(address);
pud_t *pud;
@@ -31,8 +31,10 @@ pte_t *lookup_address(unsigned long addr
pmd = pmd_offset(pud, address);
if (pmd_none(*pmd))
return NULL;
+ *level = 2;
if (pmd_large(*pmd))
return (pte_t *)pmd;
+ *level = 3;
return pte_offset_kernel(pmd, address);
}
@@ -148,11 +150,12 @@ __change_page_attr(struct page *page, pg
pte_t *kpte;
unsigned long address;
struct page *kpte_page;
+ int level;
BUG_ON(PageHighMem(page));
address = (unsigned long)page_address(page);
- kpte = lookup_address(address);
+ kpte = lookup_address(address, &level);
if (!kpte)
return -EINVAL;
kpte_page = virt_to_page(kpte);
Index: linux/include/asm-x86/pgtable_32.h
===================================================================
--- linux.orig/include/asm-x86/pgtable_32.h
+++ linux/include/asm-x86/pgtable_32.h
@@ -443,7 +443,7 @@ static inline pte_t pte_modify(pte_t pte
* NOTE: the return type is pte_t but if the pmd is PSE then we return it
* as a pte too.
*/
-extern pte_t *lookup_address(unsigned long address);
+extern pte_t *lookup_address(unsigned long address, int *level);
/*
* Make a given kernel text page executable/non-executable.
Index: linux/arch/x86/mm/fault_32.c
===================================================================
--- linux.orig/arch/x86/mm/fault_32.c
+++ linux/arch/x86/mm/fault_32.c
@@ -643,7 +643,8 @@ no_context:
#ifdef CONFIG_X86_PAE
if (error_code & 16) {
- pte_t *pte = lookup_address(address);
+ int level;
+ pte_t *pte = lookup_address(address, &level);
if (pte && pte_present(*pte) && !pte_exec_kernel(*pte))
printk(KERN_CRIT "kernel tried to execute "
Index: linux/arch/x86/mm/init_32.c
===================================================================
--- linux.orig/arch/x86/mm/init_32.c
+++ linux/arch/x86/mm/init_32.c
@@ -528,11 +528,12 @@ int __init set_kernel_exec(unsigned long
{
pte_t *pte;
int ret = 1;
+ int level;
if (!nx_enabled)
goto out;
- pte = lookup_address(vaddr);
+ pte = lookup_address(vaddr, &level);
BUG_ON(!pte);
if (!pte_exec_kernel(*pte))
Index: linux/arch/x86/xen/mmu.c
===================================================================
--- linux.orig/arch/x86/xen/mmu.c
+++ linux/arch/x86/xen/mmu.c
@@ -58,7 +58,8 @@
xmaddr_t arbitrary_virt_to_machine(unsigned long address)
{
- pte_t *pte = lookup_address(address);
+ int level;
+ pte_t *pte = lookup_address(address, &level);
unsigned offset = address & PAGE_MASK;
BUG_ON(pte == NULL);
@@ -70,8 +71,9 @@ void make_lowmem_page_readonly(void *vad
{
pte_t *pte, ptev;
unsigned long address = (unsigned long)vaddr;
+ int level;
- pte = lookup_address(address);
+ pte = lookup_address(address, &level);
BUG_ON(pte == NULL);
ptev = pte_wrprotect(*pte);
@@ -84,8 +86,9 @@ void make_lowmem_page_readwrite(void *va
{
pte_t *pte, ptev;
unsigned long address = (unsigned long)vaddr;
+ int level;
- pte = lookup_address(address);
+ pte = lookup_address(address, &level);
BUG_ON(pte == NULL);
ptev = pte_mkwrite(*pte);
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
Powered by blists - more mailing lists