Slabbed-or-not: Detect if your VPS container is running under a hypervisor

Re:Slabbed-or-not: Detect if your VPS container is running u... by iam on Wednesday January 29, 2014 @11:58PM (#7149151)

Out of curiosity how would you reimplement this file in bash? https://github.com/kaniini/slabbed-or-not/blob/master/xen-de...

In particular, the fact that it's using inline asm directly (for cpuid, ud2, some others). Maybe with 'as' but that's not exactly pure bash (and I suspect not embedding it in C would need a non-trivial main function anyway).

Reading an arbitrary memory address (for the cpuid scans) might be a bit tricky too, though it could be doable with /proc/$PID/mem.

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Re:Slabbed-or-not: Detect if your VPS container is running u... by nailer on Thursday January 30, 2014 @08:36AM (#7150555)

CPUID is available in /proc/cpuinfo (or whatever the /sys or modern equivalent is, my Linux is a bit rusty)

Not sure re: UD2 though.

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Re:Slabbed-or-not: Detect if your VPS container is running u... by nenolod on Thursday January 30, 2014 @09:22AM (#7150761)

The point here is that the information in /proc/cpuinfo is virtualized, and therefore may not reflect reality...

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Re:Slabbed-or-not: Detect if your VPS container is running u... by nailer on Thursday January 30, 2014 @10:19AM (#7151054)

Would you have to be a kernel module to access the CPU directly?

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Re:Slabbed-or-not: Detect if your VPS container is running u... by aryastark on Thursday January 30, 2014 @02:09PM (#7152690)

No. All binary programs access the CPU directly. Only certain instructions require being in a certain "ring" (i.e. access level). The CPUID instruction is non-privileged, meaning you can access it from user space.

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