Messages in this thread | | | Date | Fri, 12 Dec 2014 13:30:48 +0100 | From | Pavel Machek <> | Subject | Re: [GIT pull] x86 mpx support for 3.19 |
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> +config X86_INTEL_MPX > + prompt "Intel MPX (Memory Protection Extensions)" > + def_bool y
bool?
> + depends on CPU_SUP_INTEL > + ---help--- > + MPX provides hardware features that can be used in > + conjunction with compiler-instrumented code to check > + memory references. It is designed to detect buffer > + overflow or underflow bugs. > + > + This option enables running applications which are > + instrumented or otherwise use MPX. It does not use MPX > + itself inside the kernel or to protect the kernel > + against bad memory references. > + > + Enabling this option will make the kernel larger: > + ~8k of kernel text and 36 bytes of data on a 64-bit > + defconfig. It adds a long to the 'mm_struct' which > + will increase the kernel memory overhead of each > + process and adds some branches to paths used during > + exec() and munmap().
Should you explain what kind of CPUs support it? Basically "the kind you don't have, yet"?
> + If unsure, say Y.
Disagreed here. Right now, N is right response to anyone but Intel. Pavel -- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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