gorcunov at gmail
Jul 22, 2008, 3:19 AM
Post #3 of 3
(199 views)
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Re: [patch 1/5] x86: ACPI - add checking for NULL early param
[In reply to]
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[Andrew Morton - Tue, Jul 22, 2008 at 02:53:32AM -0700]
| On Sat, 05 Jul 2008 15:53:35 +0400 Cyrill Gorcunov <gorcunov [at] gmail> wrote:
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| > Signed-off-by: Cyrill Gorcunov <gorcunov [at] gmail>
| > ---
| >
| > 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);
| >
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| Could you please explain this patch?
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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 -
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