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Date: Thu, 2 Feb 2017 12:14:15 +0530
From: Balbir Singh <>
To: Bhupesh Sharma <>
	Alistair Popple <>,
	Anatolij Gustschin <>,,
	Daniel Cashman <>,
	Scott Wood <>, Paul Mackerras <>,,,
	Alexander Graf <>
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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