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[PATCH] paravirt: Be careful about touching BIOS address space

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BIOS ROM areas may not be mapped into the guest address space, so be careful
when touching those addresses to make sure they appear to be mapped.

[akpm@osdl.org: fix unused var warning]
AK: Changed __get_user to probe_kernel_address

Signed-off-by: Jeremy Fitzhardinge <jeremy@xensource.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Andi Kleen <ak@suse.de>
Cc: Jeremy Fitzhardinge <jeremy@goop.org>
Cc: Andi Kleen <ak@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
This commit is contained in:
Rusty Russell 2006-12-07 02:14:08 +01:00 committed by Andi Kleen
parent da181a8b39
commit bd472c794b
2 changed files with 18 additions and 3 deletions
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10
arch/i386/kernel/e820.c
View file

@ -9,6 +9,7 @@
#include <linux/mm.h>
#include <linux/efi.h>
#include <linux/pfn.h>
#include <linux/uaccess.h>
#include <asm/pgtable.h>
#include <asm/page.h>
@ -155,7 +156,14 @@ static struct resource standard_io_resources[] = { {
.flags = IORESOURCE_BUSY | IORESOURCE_IO
} };
#define romsignature(x) (*(unsigned short *)(x) == 0xaa55)
static int romsignature(const unsigned char *x)
{
unsigned short sig;
int ret = 0;
if (probe_kernel_address((const unsigned short *)x, sig) == 0)
ret = (sig == 0xaa55);
return ret;
}
static int __init romchecksum(unsigned char *rom, unsigned long length)
{

11
arch/i386/pci/pcbios.c
View file

@ -5,6 +5,7 @@
#include <linux/pci.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/uaccess.h>
#include "pci.h"
#include "pci-functions.h"
@ -314,6 +315,10 @@ static struct pci_raw_ops * __devinit pci_find_bios(void)
for (check = (union bios32 *) __va(0xe0000);
check <= (union bios32 *) __va(0xffff0);
++check) {
long sig;
if (probe_kernel_address(&check->fields.signature, sig))
continue;
if (check->fields.signature != BIOS32_SIGNATURE)
continue;
length = check->fields.length * 16;
@ -331,11 +336,13 @@ static struct pci_raw_ops * __devinit pci_find_bios(void)
}
DBG("PCI: BIOS32 Service Directory structure at 0x%p\n", check);
if (check->fields.entry >= 0x100000) {
printk("PCI: BIOS32 entry (0x%p) in high memory, cannot use.\n", check);
printk("PCI: BIOS32 entry (0x%p) in high memory, "
"cannot use.\n", check);
return NULL;
} else {
unsigned long bios32_entry = check->fields.entry;
DBG("PCI: BIOS32 Service Directory entry at 0x%lx\n", bios32_entry);
DBG("PCI: BIOS32 Service Directory entry at 0x%lx\n",
bios32_entry);
bios32_indirect.address = bios32_entry + PAGE_OFFSET;
if (check_pcibios())
return &pci_bios_access;