lkml.org 
[lkml]   [2014]   [Oct]   [31]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
SubjectRe: [PATCH] x86, kaslr: Prevent .bss from overlaping initrd
Date
Mika Penttilä <mika.j.penttila@gmail.com> writes:

>> When choosing a random address, the current implementation does not take into
>> account the reversed space for .bss and .brk sections. Thus the relocated kernel
>> may overlap other components in memory, e.g. the initrd image:
>
> initrd should be included in the avoid arrays already, and bss is
> included in the output_size
>
> for choose_kernel_location(). So something else is going on?

output_size = sizeof(vmlinux.bin) + sizeof(vmlinux.relocs)

vmlinux.bin is an ELF file that contains a section header for .bss. Thus
output_size does not include sizeof(.bss).

Best Regards
Junjie Mao

>
> --Mika
>
> On Thu, Oct 30, 2014 at 9:06 PM, Mika Penttilä
> <mika.j.penttila@gmail.com> wrote:
>>> When choosing a random address, the current implementation does not take
>>> into
>>> account the reversed space for .bss and .brk sections. Thus the relocated
>>> kernel
>>> may overlap other components in memory, e.g. the initrd image:
>>
>> initrd should be included in the avoid arrays already, and bss is included
>> in the output_size
>>
>> for choose_kernel_location(). So something else is going on?
>>
>> --Mika
>>
>>
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2014-10-31 08:41    [W:0.056 / U:0.308 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site