From: Michael Ellerman <mpe@ellerman•id.au>
To: Kees Cook <keescook@chromium•org>
Cc: "Linux MIPS Mailing List" <linux-mips@linux-mips•org>,
"Arun Chandran" <achandran@mvista•com>,
"Catalin Marinas" <catalin.marinas@arm•com>,
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"Alexander Viro" <viro@zeniv•linux.org.uk>
Subject: Re: [PATCH 4/5] mm: split ET_DYN ASLR from mmap ASLR
Date: Thu, 05 Mar 2015 10:56:20 +1100 [thread overview]
Message-ID: <1425513380.32154.13.camel@ellerman.id.au> (raw)
In-Reply-To: <CAGXu5j+Pu-xeCBcMZZqTgLfKss7Er0pfCxp04a4eWDWhuDryTQ@mail.gmail.com>
On Wed, 2015-03-04 at 13:13 -0800, Kees Cook wrote:
>
> I had a question in the powerpc-specific change that may have gone unnoticed:
>
> Can mmap ASLR be safely enabled in the legacy mmap case here? Other archs
> use "mm->mmap_base = TASK_UNMAPPED_BASE + random_factor".
>
> Separate from this series, do you happen to know if this improvement
> can be made, or if the legacy mmap on powerpc can't handle this?
Yeah I saw that. The short answer is I'm not sure.
I assume we have that distinction for some good reason, but whether we still
need it I don't know. I'll dig a bit and see if anyone can remember the details.
cheers
next prev parent reply other threads:[~2015-03-04 23:56 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-03-03 0:19 [PATCH v2 0/5] split ET_DYN ASLR from mmap ASLR Kees Cook
2015-03-03 0:19 ` [PATCH 1/5] arm: factor out mmap ASLR into mmap_rnd Kees Cook
2015-03-09 14:48 ` Russell King - ARM Linux
2015-03-03 0:19 ` [PATCH 2/5] mm: expose arch_mmap_rnd when available Kees Cook
2015-03-09 14:49 ` Russell King - ARM Linux
2015-03-03 0:19 ` [PATCH 3/5] mm: move randomize_et_dyn into ELF_ET_DYN_BASE Kees Cook
2015-03-03 0:19 ` [PATCH 4/5] mm: split ET_DYN ASLR from mmap ASLR Kees Cook
2015-03-04 4:16 ` Michael Ellerman
2015-03-04 21:13 ` Kees Cook
2015-03-04 23:56 ` Michael Ellerman [this message]
2015-03-09 15:13 ` Russell King - ARM Linux
2015-03-03 0:19 ` [PATCH 5/5] mm: fold arch_randomize_brk into ARCH_HAS_ELF_RANDOMIZE Kees Cook
2015-03-09 14:51 ` Russell King - ARM Linux
2015-03-03 7:31 ` [PATCH v2 0/5] split ET_DYN ASLR from mmap ASLR Ingo Molnar
2015-03-03 18:03 ` Kees Cook
2015-03-04 4:20 ` Ingo Molnar
2015-03-09 15:15 ` Russell King - ARM Linux
-- strict thread matches above, loose matches on Subject: below --
2015-02-27 3:07 [PATCH " Kees Cook
2015-02-27 3:07 ` [PATCH 4/5] mm: " Kees Cook
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