From: David Daney <ddaney.cavm@gmail.com>
To: Christoph Lameter <cl@linux.com>
Cc: "Kees Cook" <keescook@chromium.org>,
"Leonid Yegoshin" <Leonid.Yegoshin@imgtec.com>,
"Linux MIPS Mailing List" <linux-mips@linux-mips.org>,
Zubair.Kakakhel@imgtec.com, geert+renesas@glider.be,
david.daney@cavium.com, "Peter Zijlstra" <peterz@infradead.org>,
"Paul Gortmaker" <paul.gortmaker@windriver.com>,
davidlohr@hp.com, "Maciej W. Rozycki" <macro@linux-mips.org>,
chenhc@lemote.com, "Ingo Molnar" <mingo@kernel.org>,
"Richard Weinberger" <richard@nod.at>,
"Rafał Miłecki" <zajec5@gmail.com>,
"James Hogan" <james.hogan@imgtec.com>,
"Tejun Heo" <tj@kernel.org>,
alex@alex-smith.me.uk, "Paolo Bonzini" <pbonzini@redhat.com>,
"John Crispin" <blogic@openwrt.org>,
"Paul Burton" <paul.burton@imgtec.com>,
qais.yousef@imgtec.com, LKML <linux-kernel@vger.kernel.org>,
"Ralf Baechle" <ralf@linux-mips.org>,
"Markos Chandras" <markos.chandras@imgtec.com>,
dengcheng.zhu@imgtec.com, manuel.lauss@gmail.com,
lars.persson@axis.com
Subject: Re: [PATCH v3 3/3] MIPS: set stack/data protection as non-executable
Date: Fri, 05 Dec 2014 13:41:08 -0800 [thread overview]
Message-ID: <54822674.20907@gmail.com> (raw)
In-Reply-To: <alpine.DEB.2.11.1412051343330.5206@gentwo.org>
On 12/05/2014 11:44 AM, Christoph Lameter wrote:
> On Fri, 5 Dec 2014, David Daney wrote:
>
>> The problem is not with "modern" executables that are properly annotated with
>> PT_GNU_STACK.
>>
>> My objection is to the intentional breaking of old executables that have no
>> PT_GNU_STACK annotation, but require an executable stack. Since we usually
>> try not to break userspace, we cannot merge a patch like this one.
>
> How old are these and how many are still around?
As far as I can determine, no official GCC release defaults to
generating PT_GNU_STACK for MIPS, I could be mistaken though. So to
answer your questions: Very young, and all of them.
> Can the annotation be added with a tool?
I don't know, although I seem to recall that such a tool existed, and I
may have even used it in the past. But, my google fu is not
sufficiently advanced to find it now, if it exists.
David Daney
prev parent reply other threads:[~2014-12-05 21:41 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-12-03 1:57 [PATCH v3 0/3] Series short description Leonid Yegoshin
2014-12-03 1:58 ` [PATCH v3 1/3] MIPS: mips_flush_cache_range is added Leonid Yegoshin
2014-12-03 1:58 ` [PATCH v3 2/3] MIPS: Setup an instruction emulation in VDSO protected page instead of user stack Leonid Yegoshin
2014-12-03 1:58 ` [PATCH v3 3/3] MIPS: set stack/data protection as non-executable Leonid Yegoshin
2014-12-05 17:28 ` David Daney
2014-12-05 18:51 ` Kees Cook
2014-12-05 19:06 ` David Daney
2014-12-05 19:41 ` Leonid Yegoshin
2014-12-05 19:41 ` Kees Cook
2014-12-05 19:44 ` Christoph Lameter
2014-12-05 21:41 ` David Daney [this message]
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