Linux kernel: multiple x86_64 vulnerabilities

Re:Linux kernel: multiple x86_64 vulnerabilities by easytiger on Thursday December 18, 2014 @04:44PM (#8769815)

> Also, on new enough kernels with new enough glibc (I think), even 32-bit programs use vdso timing.

I saw a patch being discussed but wasn't sure if it made it in. I'd rather it didn't because some people are insisting they need it so they can run 32bit Java (for performance reasons because GC is marginally faster). The irony is entirely lost on them.

Really useful little set of experiments, good to have them in one place.

Not familliar with pcmcs, what are they?

[ Parent | on HN ]

Re:Linux kernel: multiple x86_64 vulnerabilities by amluto on Friday December 19, 2014 @04:23PM (#8774605)

> Not familliar with pcmcs, what are they?

They're performance monitoring counters, which are complicated programmable things on most x86 chips that could cache misses, cycles, etc. They don't come with a sensible way to selectively grant user access.

[ Parent | on HN ]

Re:Linux kernel: multiple x86_64 vulnerabilities by easytiger on Monday December 22, 2014 @11:10AM (#8783599)

Ahhh yes. of course. Thanks

[ Parent | on HN ]