From: Marcelo Tosatti <marcelo.tosatti@cyclades.com>
To: Andrey Savochkin <saw@saw.sw.com.sg>
Cc: Jirka Kosina <jikos@jikos.cz>,
Giuliano Pochini <pochini@shiny.it>,
linux-kernel@vger.kernel.org
Subject: Re: FW: Linux kernel file offset pointer races
Date: Wed, 11 Aug 2004 18:14:30 -0300 [thread overview]
Message-ID: <20040811211430.GA4275@dmt.cyclades> (raw)
In-Reply-To: <20040811182602.A2055@castle.nmd.msu.ru>
On Wed, Aug 11, 2004 at 06:26:02PM +0400, Andrey Savochkin wrote:
> BTW, f_pos assignments are non-atomic on IA-32 since it's a 64-bit value.
> The file position is protected by the BKL in llseek(), but I do not see any
> serialization neither in sys_read() nor in generic_file_read() and other
> methods.
>
> Have we accepted that the file position may be corrupted after crossing 2^32
> boundary by 2 processes reading in parallel from the same file?
> Or am I missing something?
Yes, as far as I know, parallel users of the same file descriptions (which
can race on 64-bit architectures) is expected, we dont care about handling it.
Behaviour is undefined.
next prev parent reply other threads:[~2004-08-11 21:39 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-08-05 8:42 FW: Linux kernel file offset pointer races Giuliano Pochini
2004-08-05 10:30 ` Jirka Kosina
2004-08-07 17:15 ` Marcelo Tosatti
2004-08-11 14:26 ` Andrey Savochkin
2004-08-11 21:14 ` Marcelo Tosatti [this message]
2004-08-12 7:55 ` Andrey Savochkin
2004-08-12 13:53 ` Marcelo Tosatti
2004-08-09 8:33 ` Frank Steiner
2004-08-09 14:45 ` Alan Cox
2004-08-09 16:50 ` Jonathan Corbet
2004-08-09 17:24 ` Linus Torvalds
2004-08-10 6:08 ` Frank Steiner
2004-08-05 20:34 ` Alan Cox
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