[Andrew Morton - Tue, Jul 22, 2008 at 02:53:32AM -0700]
| On Sat, 05 Jul 2008 15:53:35 +0400 Cyrill Gorcunov <gorcunov@xxxxxxxxx> wrote:
|
| > Signed-off-by: Cyrill Gorcunov <gorcunov@xxxxxxxxx>
| > ---
| >
| > Index: linux-2.6.git/drivers/acpi/tables.c
| > ====================================================================
| > --- linux-2.6.git.orig/drivers/acpi/tables.c 2008-01-21 23:14:47.000000000 +0300
| > +++ linux-2.6.git/drivers/acpi/tables.c 2008-07-05 12:24:16.000000000 +0400
| > @@ -300,6 +300,8 @@ int __init acpi_table_init(void)
| >
| > static int __init acpi_parse_apic_instance(char *str)
| > {
| > + if (!str)
| > + return -EINVAL;
| >
| > acpi_apic_instance = simple_strtoul(str, NULL, 0);
| >
|
| Could you please explain this patch?
|
we could get NULL deref here - if you start kernel as
qemu-system-x86_64 -kernel arch/x86/boot/bzImage -append "root=/dev/sda acpi_apic_instance" ../images/root-j
so user was not carried about correct boot option and the kernel respond by
hang - which is not good I think. Actually - by the patch we easy protect
ourself from user-madness :)
- Cyrill -
--
To unsubscribe from this list: send the line "unsubscribe linux-acpi" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
