* arm64/mm: Remove hack in mmap randomize layout
@ 2015-07-13 15:07 Matthias Brugger
2015-07-15 9:54 ` Yann Droneaud
` (2 more replies)
0 siblings, 3 replies; 4+ messages in thread
From: Matthias Brugger @ 2015-07-13 15:07 UTC (permalink / raw)
To: stable; +Cc: Will Deacon, Yann Droneaud
Hi all,
Commit d6c763afab14 "arm64/mm: Remove hack in mmap randomize layout" fixes a
security issue which reduces the entropy for mmap base address by half [1].
A attempt to guess where the stack is mapped via brute-force needs just half
the attempts.
I found this patch was added to v3.19-rc1 but should be added as well to:
v3.18, v3.14, v3.12 and v3.10
Best regards,
Matthias Brugger
[1] http://hmarco.org/bugs/linux-ASLR-reducing-mmap-by-half.html
^ permalink raw reply [flat|nested] 4+ messages in thread* Re: arm64/mm: Remove hack in mmap randomize layout
2015-07-13 15:07 arm64/mm: Remove hack in mmap randomize layout Matthias Brugger
@ 2015-07-15 9:54 ` Yann Droneaud
2015-07-21 13:55 ` Jiri Slaby
2015-09-11 22:27 ` Greg KH
2 siblings, 0 replies; 4+ messages in thread
From: Yann Droneaud @ 2015-07-15 9:54 UTC (permalink / raw)
To: stable; +Cc: Will Deacon, Matthias Brugger
Hi,
Le lundi 13 juillet 2015 à 17:07 +0200, Matthias Brugger a écrit :
>
> Commit d6c763afab14 "arm64/mm: Remove hack in mmap randomize layout"
> fixes a security issue which reduces the entropy for mmap base
> address by half [1].
> A attempt to guess where the stack is mapped via brute-force needs
> just half the attempts.
>
> I found this patch was added to v3.19-rc1 but should be added as well
> to:
> v3.18, v3.14, v3.12 and v3.10
>
I agree.
The issue fixed by commit d6c763afab142a85e4770b4bc2a5f40f256d5c5d is
present since v3.7-rc1.
> [1] http://hmarco.org/bugs/linux-ASLR-reducing-mmap-by-half.html
Regards.
--
Yann Droneaud
OPTEYA
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: arm64/mm: Remove hack in mmap randomize layout
2015-07-13 15:07 arm64/mm: Remove hack in mmap randomize layout Matthias Brugger
2015-07-15 9:54 ` Yann Droneaud
@ 2015-07-21 13:55 ` Jiri Slaby
2015-09-11 22:27 ` Greg KH
2 siblings, 0 replies; 4+ messages in thread
From: Jiri Slaby @ 2015-07-21 13:55 UTC (permalink / raw)
To: mbrugger, stable; +Cc: Will Deacon, Yann Droneaud
On 07/13/2015, 05:07 PM, Matthias Brugger wrote:
> Hi all,
>
> Commit d6c763afab14 "arm64/mm: Remove hack in mmap randomize layout" fixes a
> security issue which reduces the entropy for mmap base address by half [1].
> A attempt to guess where the stack is mapped via brute-force needs just half
> the attempts.
>
> I found this patch was added to v3.19-rc1 but should be added as well to:
> v3.18, v3.14, v3.12 and v3.10
Applied to 3.12. Thanks.
--
js
suse labs
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: arm64/mm: Remove hack in mmap randomize layout
2015-07-13 15:07 arm64/mm: Remove hack in mmap randomize layout Matthias Brugger
2015-07-15 9:54 ` Yann Droneaud
2015-07-21 13:55 ` Jiri Slaby
@ 2015-09-11 22:27 ` Greg KH
2 siblings, 0 replies; 4+ messages in thread
From: Greg KH @ 2015-09-11 22:27 UTC (permalink / raw)
To: Matthias Brugger; +Cc: stable, Will Deacon, Yann Droneaud
On Mon, Jul 13, 2015 at 05:07:54PM +0200, Matthias Brugger wrote:
> Hi all,
>
> Commit d6c763afab14 "arm64/mm: Remove hack in mmap randomize layout" fixes a
> security issue which reduces the entropy for mmap base address by half [1].
> A attempt to guess where the stack is mapped via brute-force needs just half
> the attempts.
>
> I found this patch was added to v3.19-rc1 but should be added as well to:
> v3.18, v3.14, v3.12 and v3.10
Thanks, now queued up for some of those.
greg k-h
^ permalink raw reply [flat|nested] 4+ messages in thread
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2015-07-13 15:07 arm64/mm: Remove hack in mmap randomize layout Matthias Brugger
2015-07-15 9:54 ` Yann Droneaud
2015-07-21 13:55 ` Jiri Slaby
2015-09-11 22:27 ` Greg KH
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