[mythtv] VideoOut Priority
simon at sxw.org.uk
Fri Jan 30 18:24:42 EST 2004
Kenneth Aafl°y wrote:
> And you can run MythTV with a non root user if you assign the correct
> permissions to /dev/mem (untested - but all reasonable logic tells me that it
> should work), but that's another security hole (not that it matters on a
No, you can't.
The problem is that ddmpeg calls ioperm() and iopl() to gain permission
for a later call to inb(). The ioperm() and iopl() fail when not run as
root, but the exit code isn't checked. This means that when inb() is
called, it seg faults, as indictated in its man page:
You use ioperm(2) or alternatively iopl(2) to tell the kernel to allow
the user space application to access the I/O ports in question. Failure
to do this will cause the application to receive a segmentation fault.
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