From: Yann Droneaud <ydroneaud@opteya.com>
To: stable@vger.kernel.org
Cc: Will Deacon <will.deacon@arm.com>, Matthias Brugger <mbrugger@suse.com>
Subject: Re: arm64/mm: Remove hack in mmap randomize layout
Date: Wed, 15 Jul 2015 11:54:19 +0200 [thread overview]
Message-ID: <1436954059.2156.13.camel@opteya.com> (raw)
In-Reply-To: <5009675.v9gvjRB4Io@ubix>
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
next prev parent reply other threads:[~2015-07-15 10:21 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-07-13 15:07 arm64/mm: Remove hack in mmap randomize layout Matthias Brugger
2015-07-15 9:54 ` Yann Droneaud [this message]
2015-07-21 13:55 ` Jiri Slaby
2015-09-11 22:27 ` Greg KH
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