linux-kernel - Re: [Xen-devel] [PATCH] xen/privcmd: sprinkle around cond

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] [day] [month] [year] [list]

Date:	Thu, 7 Jul 2016 10:37:17 +0100
From:	David Vrabel <david.vrabel@...rix.com>
To:	Jan Beulich <JBeulich@...e.com>, <david.vrabel@...rix.com>,
	<boris.ostrovsky@...cle.com>, Juergen Gross <JGross@...e.com>
CC:	<xen-devel@...ts.xenproject.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [Xen-devel] [PATCH] xen/privcmd: sprinkle around cond_resched()
 calls in mmap ioctl handling

On 07/07/16 08:35, Jan Beulich wrote:
> Many of these operations can take arbitrarily long, which can become a
> problem irrespective of them being exposed to privileged users only.

If this is a concern I would rather see large numbers of mapping
requests processed in smaller batches.  This would also limit the amount
of memory needed.

Note also that xen_remap_domain_gfn() array already has a cond_resched()
after every batch of 16 GFNs.

David