From: Ed Vance <EdV@macrolink.com>
To: "'Roman Kurakin'" <rik@cronyx.ru>, Russell King <rmk@arm.linux.org.uk>
Cc: "'linux-serial'" <linux-serial@vger.kernel.org>,
"'linux-kernel'" <linux-kernel@vger.kernel.org>
Subject: RE: Serial.c BUG 2.4.x-2.5x
Date: Thu, 7 Mar 2002 08:51:32 -0800 [thread overview]
Message-ID: <11E89240C407D311958800A0C9ACF7D13A76DD@EXCHANGE> (raw)
Thanks Russell and Roman for your helpful input. I'll look at it today and
resubmit for further discussion.
Ed Vance
Roman Kurakin wrote:
> Russell King wrote:
>
> >The patch does fine for the most part, but I have two worries:
> >
> >1. the possibilities of pushing through changes in the IO or memory space
> > by changing the other space at the same time. (ie, port = 1, iomem =
> > 0xfe007c00 and you already have a line at port = 0, iomem =
0xfe007c00).
> > I delt with this properly using the resource management subsystem.
> >
> I think such code could solve this problem ...
>
> - (rs_table[i].port == new_port) &&
> + ((rs_table[i].port && rs_table[i].port ==
new_port) ||
> + ((rs_table[i].iomem_base &&
rs_table[i].iomem_base == new_mem)) &&
>
>
> >2. there seems to be a lack of security considerations for changing the
> > iomem address. (ie, changing the iomem address without CAP_SYS_ADMIN.
> > I added this as an extra check for change_port)
> >
> And this one could be fixed with something like this (this is no a
> patch, just an idea)
>
> change_port = (new_port != ((int) state->port)) ||
> (new_serial.hub6 != state->hub6);
> + change_mem = (new_mem != state->iomem_base)
>
> if (!capable(CAP_SYS_ADMIN)) {
> - if (change_irq || change_port ||
> + if (change_irq || change_port || change_mem
>
----------------------------------------------------------------
Ed Vance serial24@macrolink.com
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next reply other threads:[~2002-03-07 16:51 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-03-07 16:51 Ed Vance [this message]
-- strict thread matches above, loose matches on Subject: below --
2002-03-19 0:16 Serial.c BUG 2.4.x-2.5x Ed Vance
2002-03-01 19:07 Ed Vance
2002-03-06 20:39 ` Russell King
2002-03-07 13:53 ` Roman Kurakin
2002-03-01 12:18 Roman Kurakin
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