linux-kernel - Re: [PATCH 3/3] ARM 4Kstacks: Decrease poll and select stack usage, when using 4K stacks

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 for Android: free password hash cracker in your pocket

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

Message-Id: <201110201421.43747.arnd@arndb.de>
Date:	Thu, 20 Oct 2011 14:21:43 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	Tim Bird <tim.bird@...sony.com>
Cc:	Russell King <rmk@....linux.org.uk>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Andi Kleen <andi@...stfloor.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	linux kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 3/3] ARM 4Kstacks: Decrease poll and select stack usage, when using 4K stacks

On Wednesday 19 October 2011, Tim Bird wrote:
> Reduce the max allowed size for struct poll_wqueue to avoid
> using too much stack space in do_select() and do_sys_poll(),
> when the kernel is using 4K stacks.
> 
> Signed-off-by: Tim Bird <tim.bird@...sony.com>

Can you explain why this is necessary with 4K stacks? I would
expect the poll() function never to be deeply nested, so 1K
used in there doesn't sound too problematic.

	Arnd
--
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/