linux-kernel - Re: splice vs execve lockdep trace.

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]

Date:	Wed, 17 Jul 2013 17:17:36 -0700
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Ben Myers <bpm@....com>
Cc:	Dave Chinner <david@...morbit.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Oleg Nesterov <oleg@...hat.com>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	Alexander Viro <viro@...iv.linux.org.uk>,
	Dave Jones <davej@...hat.com>, xfs@....sgi.com
Subject: Re: splice vs execve lockdep trace.

On Wed, Jul 17, 2013 at 4:40 PM, Ben Myers <bpm@....com> wrote:
>>
>> We're still talking at cross purposes then.
>>
>> How the hell do you handle mmap() and page faulting?
>
> __xfs_get_blocks serializes access to the block map with the i_lock on the
> xfs_inode.  This appears to be racy with respect to hole punching.

Would it be possible to just make __xfs_get_blocks get the i_iolock
(non-exclusively)?

Or, alternatively, do it in the readpage() function?

That was what I thought you did anyway. Exactly because of the whole
page faulting issue.

                   Linus
--
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/