Messages in this thread | | | Date | Wed, 2 Oct 2013 14:46:10 +0200 | From | Peter Zijlstra <> | Subject | Re: [RFC] perf: mmap2 not covering VM_CLONE regions |
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On Wed, Oct 02, 2013 at 02:39:53PM +0200, Ingo Molnar wrote: > - then there are timing attacks, and someone having access to a PMU > context and who can trigger this SHA1 computation arbitrarily in task > local context can run very accurate and low noise timing attacks... > > I don't think the kernel's sha_transform() is hardened against timing > attacks, it's performance optimized so it has variable execution time > highly dependent on plaintext input - which leaks information about the > plaintext.
Typical user doesn't have enough priv to profile kernel space; once you do you also have enough priv to see kernel addresses outright (ie. kallsyms etc..).
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