linux-kernel - Re: [-mm patch] i386: enable 4k stacks by default

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: <20070430173819.GC19966@holomorphy.com>
Date:	Mon, 30 Apr 2007 10:38:19 -0700
From:	William Lee Irwin III <wli@...omorphy.com>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	Christoph Hellwig <hch@...radead.org>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	David Chinner <dgc@....com>, Zan Lynx <zlynx@....org>,
	Adrian Bunk <bunk@...sta.de>,
	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: [-mm patch] i386: enable 4k stacks by default

On Mon, Apr 30, 2007 at 02:13:16PM +0200, Andi Kleen wrote:
> Actually looking at the code it would need some fixes first:
> /*
>  * These should really be __section__(".bss.page_aligned") as well, but
>  * gcc's 3.0 and earlier don't handle that correctly.
>  */
> static char softirq_stack[NR_CPUS * THREAD_SIZE]
>                 __attribute__((__aligned__(THREAD_SIZE)));
> 
> static char hardirq_stack[NR_CPUS * THREAD_SIZE]
>                 __attribute__((__aligned__(THREAD_SIZE)));
> 
> With 8K stacks and NR_CPUS==128 that would be 2MB statically reserved. Yuck.
> Really needs to be dynamically allocated. I'll take a look once the .22 
> big merge is done.

Here's what I did for i386 for someone concerned about blowing the stack.


-- wli
-
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/