Messages in this thread | | | From | "H. Peter Anvin" <> | Subject | Re: MSR support for x86 | Date | Fri, 28 Feb 1997 16:10:51 -0800 (PST) |
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> > I should think you would want it to be crw-r--r--, so that anybody can see > what they are running on. Perhaps the /dev/msr code should double check > that root is doing the write, so even if somebody can get past the VFS, they > still can't fry your CPU. > > Also, what will this do on a SMP system? Just die, only set the first CPU, > set all of them? >
Yes, there need to be something reasonable. I do *not* think it is reasonable for random processes to even read the special registers -- on some CPUs that could potentially give away dangerous information.
I think /dev/msr on a multiprocessor should read the CPU the process is running on.
-hpa
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