x86, kaslr: Provide randomness functions

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Adds potential sources of randomness: RDRAND, RDTSC, or the i8254.

This moves the pre-alternatives inline rdrand function into the header so
both pieces of code can use it. Availability of RDRAND is then controlled
by CONFIG_ARCH_RANDOM, if someone wants to disable it even for kASLR.

Signed-off-by: Kees Cook <keescook@chromium.org>
Link: http://lkml.kernel.org/r/1381450698-28710-4-git-send-email-keescook@chromium.org
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>

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Kees Cook 2013-10-10 17:18:15 -07:00 • committed by H. Peter Anvin

parent 8ab3820fd5

commit 5bfce5ef55

4 changed files with 76 additions and 14 deletions

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53

arch/x86/boot/compressed/aslr.c

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2

arch/x86/boot/compressed/misc.h

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21

arch/x86/include/asm/archrandom.h

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14

arch/x86/kernel/cpu/rdrand.c

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