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Date: Thu, 2 Feb 2017 12:14:15 +0530
From: Balbir Singh <bsingharora@...il.com>
To: Bhupesh Sharma <bhsharma@...hat.com>
Cc: linuxppc-dev@...ts.ozlabs.org, kernel-hardening@...ts.openwall.com,
Alistair Popple <alistair@...ple.id.au>,
Anatolij Gustschin <agust@...x.de>, keescook@...omium.org,
Daniel Cashman <dcashman@...roid.com>,
Scott Wood <oss@...error.net>, Paul Mackerras <paulus@...ba.org>,
dcashman@...gle.com, bhupesh.linux@...il.com,
Alexander Graf <agraf@...e.com>
Subject: Re: [PATCH 0/2] RFC: Adjust powerpc ASLR elf randomness
On Thu, Feb 02, 2017 at 11:12:46AM +0530, Bhupesh Sharma wrote:
> This RFC patchset tries to make the powerpc ASLR elf randomness
> implementation similar to other ARCHs (like x86).
>
> The 1st patch introduces the support of ARCH_MMAP_RND_BITS in powerpc
> mmap implementation to allow a sane balance between increased randomness
> in the mmap address of ASLR elfs and increased address space
> fragmentation.
>
>From what I see we get 28 bits of entropy right for 64k pages
bits as compared to 14 bits earlier?
> The 2nd patch increases the ELF_ET_DYN_BASE value from the current
> hardcoded value of 0x2000_0000 to something more practical,
> i.e. TASK_SIZE - PAGE_SHIFT (which makes sense especially for
> 64-bit platforms which would like to utilize more randomization
> in the load address of a PIE elf).
>
This helps PIE executables as such and leaves other not impacted?
Balbir Singh
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