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xen-devel
Re: [Xen-devel] Kernel Bug asterisk
On Mer, 2006-05-10 at 15:15 +0100, Keir Fraser wrote:
> Unfortunately the problem will need root-causing. Clearly the driver is
> ignoring the fact it cannot bind to the IRQ line. Maybe there's some
> other way we can clobber the driver.
Current drivers/char/rtc checks the IRQ line is available and does not
load otherwise in the normal x86 setup. It is possible to build the
driver for "IRQless" operation but currently that is only done for non
x86 platforms (eg Sparc). So if it gets loaded on x86, IRQ 8 was free.
But /sbin/hwclock depending on the version has some other uglies too.
Some versions of it if they find no /dev/rtc will iopl() as root and
then proceed to whack the hardware directly.
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