diff options
Diffstat (limited to 'arch/i386/kernel/e820.c')
| -rw-r--r-- | arch/i386/kernel/e820.c | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/arch/i386/kernel/e820.c b/arch/i386/kernel/e820.c index b755255f272..b704790f796 100644 --- a/arch/i386/kernel/e820.c +++ b/arch/i386/kernel/e820.c @@ -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) { |