From: David Miller <davem@davemloft.net>
To: torvalds@linux-foundation.org
Cc: davidel@xmailserver.org, sfr@canb.auug.org.au,
akpm@linux-foundation.org, dwmw2@infradead.org,
linux-arch@vger.kernel.org, rmk@arm.linux.org.uk,
tony.luck@intel.com, ralf@linux-mips.org
Subject: Re: [PATCH]add epoll compat code to fsl/compat.c
Date: Wed, 21 Feb 2007 19:02:08 -0800 (PST) [thread overview]
Message-ID: <20070221.190208.31642609.davem@davemloft.net> (raw)
In-Reply-To: <Pine.LNX.4.64.0702211234410.4043@woody.linux-foundation.org>
From: Linus Torvalds <torvalds@linux-foundation.org>
Date: Wed, 21 Feb 2007 12:36:11 -0800 (PST)
> On Wed, 21 Feb 2007, Davide Libenzi wrote:
> >
> > I don't think we can safely assume that we can access a potentially
> > 4-bytes aligned u64 on 64 bit architectures that require compat:
> >
> > put_user(ev.data, &events->data);
>
> Oh, we can. "put_user()" and "get_user()" already have to work on totally
> unaligned data. If some architecture has problems with that, they have
> bigger issues, methinks.
>
> We can't trust user pointers, and that includes not trusting them being
> aligned.
Right, and on Sparc for userland they are illegal so we'll just
SIGBUS the process if that happens.
next prev parent reply other threads:[~2007-02-22 3:02 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-02-20 21:57 [patch 18/50] add epoll compat code to kernel/compat.c akpm
2007-02-20 23:20 ` Stephen Rothwell
2007-02-20 23:33 ` Davide Libenzi
2007-02-21 1:01 ` Stephen Rothwell
2007-02-21 1:05 ` Stephen Rothwell
2007-02-21 1:12 ` Davide Libenzi
2007-02-21 3:10 ` [PATCH]add epoll compat code to fsl/compat.c Stephen Rothwell
2007-02-21 20:24 ` Davide Libenzi
2007-02-21 20:36 ` Linus Torvalds
2007-02-21 21:04 ` Davide Libenzi
2007-02-21 21:15 ` Linus Torvalds
2007-02-22 3:07 ` David Miller
2007-02-22 4:03 ` Davide Libenzi
2007-02-22 4:39 ` Stephen Rothwell
2007-02-21 22:14 ` Ralf Baechle
2007-02-21 22:25 ` Davide Libenzi
2007-02-21 23:23 ` Ralf Baechle
2007-02-22 3:02 ` David Miller [this message]
2007-02-22 3:08 ` Davide Libenzi
2007-02-21 1:38 ` [patch 18/50] add epoll compat code to kernel/compat.c Ralf Baechle
2007-02-20 23:57 ` Andrew Morton
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