From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: Andrew Morton <akpm@osdl.org>
Cc: Sorav Bansal <sbansal@stanford.edu>,
tacetan@yahoo.com,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: BUG REPORT: User/Kernel Pointer bug in sys_poll
Date: Thu, 28 Oct 2004 20:24:49 +0100 [thread overview]
Message-ID: <1098991488.9557.35.camel@localhost.localdomain> (raw)
In-Reply-To: <20041028024839.6a1e1064.akpm@osdl.org>
On Iau, 2004-10-28 at 10:48, Andrew Morton wrote:
> is safe. We know that the address is in the 0x00000000-0xbfffffff range by
> the time we call __put_user(). And if the page at *addr it not writeable
> the kernel will take a fault.
>
> So I see no hole. But I wouldn't have coded it that way...
On x86 maybe. I think he's right in the sense that we may have a non x86
platform that this is not safe on.
next prev parent reply other threads:[~2004-10-28 20:52 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20041028052218.52478.qmail@web50207.mail.yahoo.com>
2004-10-28 5:57 ` BUG REPORT: User/Kernel Pointer bug in sys_poll Sorav Bansal
2004-10-28 9:48 ` Andrew Morton
2004-10-28 10:04 ` Sorav Bansal
2004-10-28 19:24 ` Alan Cox [this message]
[not found] <20041028052218.52478.qmail@web50207.mail.yahoo.com.suse.lists.linux.kernel>
[not found] ` <Pine.GSO.4.44.0410272246240.7124-100000@elaine9.Stanford.EDU.suse.lists.linux.kernel>
2004-10-28 6:32 ` Andi Kleen
2004-10-28 8:50 ` Denis Vlasenko
2004-10-28 4:25 Sorav Bansal
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