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SubjectRe: [PATCH 12/27] x86/msr: Restrict MSR access when the kernel is locked down
Date
Alan Cox <gnomes@lxorguk.ukuu.org.uk> wrote:

> There are a load of standard tools that use this so I think you are going
> to need a whitelist. Can you at least log *which* MSR in the failing case
> so a whitelist can be built over time ?

Probably. Is it just the file position for msr_write()? Should the register
number increment with the copy loop?

What about for the X86_IOC_WRMSR_REGS ioctl? What's the reg number there?

And do you know where wrmsr_safe_regs() might be found? I can see things
using it and exporting it, but no implementation, so I'm guessing it's
macroised somewhere.

David

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