linux-kernel - Re: [PATCH v10 15/17] kernel: add support for .init

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-id: <54CBBD8C.8080907@samsung.com>
Date:	Fri, 30 Jan 2015 20:21:16 +0300
From:	Andrey Ryabinin <a.ryabinin@...sung.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	linux-kernel@...r.kernel.org, Dmitry Vyukov <dvyukov@...gle.com>,
	Konstantin Serebryany <kcc@...gle.com>,
	Dmitry Chernenkov <dmitryc@...gle.com>,
	Andrey Konovalov <adech.fo@...il.com>,
	Yuri Gribov <tetra2005@...il.com>,
	Konstantin Khlebnikov <koct9i@...il.com>,
	Sasha Levin <sasha.levin@...cle.com>,
	Christoph Lameter <cl@...ux.com>,
	Joonsoo Kim <iamjoonsoo.kim@....com>,
	Dave Hansen <dave.hansen@...el.com>,
	Andi Kleen <andi@...stfloor.org>, x86@...nel.org,
	linux-mm@...ck.org, Arnd Bergmann <arnd@...db.de>,
	"open list:GENERIC INCLUDE/A..." <linux-arch@...r.kernel.org>
Subject: Re: [PATCH v10 15/17] kernel: add support for .init_array.*
 constructors

On 01/30/2015 02:13 AM, Andrew Morton wrote:
> On Thu, 29 Jan 2015 18:11:59 +0300 Andrey Ryabinin <a.ryabinin@...sung.com> wrote:
> 
>> KASan uses constructors for initializing redzones for global
>> variables. Actually KASan doesn't need priorities for constructors,
>> so they were removed from GCC 5.0, but GCC 4.9.2 still generates
>> constructors with priorities.
> 
> I don't understand this changelog either.  What's wrong with priorities
> and what is the patch doing about it?  More details, please.
> 

Currently kernel ignore constructors with priorities (e.g. .init_array.00099).
Kernel understand only constructors with default priority ( .init_array ).

This patch adds support for constructors with priorities.

For kernel image we put pointers to constructors between __ctors_start/__ctors_end
and do_ctors() will call them.

For modules  - .init_array.* sections merged into .init_array section.
Module code properly handles constructors in .init_array section.


--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/