diff options
| author | H. Peter Anvin <hpa@zytor.com> | 2011-07-31 14:02:19 -0700 |
|---|---|---|
| committer | H. Peter Anvin <hpa@zytor.com> | 2011-07-31 14:02:19 -0700 |
| commit | 49d859d78c5aeb998b6936fcb5f288f78d713489 (patch) | |
| tree | 04b7746d1b79ab12bf94ff1eaf9ab91e74db37ef /arch/x86/kernel/cpu/common.c | |
| parent | 628c6246d47b85f5357298601df2444d7f4dd3fd (diff) | |
x86, random: Verify RDRAND functionality and allow it to be disabled
If the CPU declares that RDRAND is available, go through a guranteed
reseed sequence, and make sure that it is actually working (producing
data.) If it does not, disable the CPU feature flag.
Allow RDRAND to be disabled on the command line (as opposed to at
compile time) for a user who has special requirements with regards to
random numbers.
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
Cc: Matt Mackall <mpm@selenic.com>
Cc: Herbert Xu <herbert@gondor.apana.org.au>
Cc: "Theodore Ts'o" <tytso@mit.edu>
Diffstat (limited to 'arch/x86/kernel/cpu/common.c')
| -rw-r--r-- | arch/x86/kernel/cpu/common.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c index 22a073d7fbf..8dbd9294f4f 100644 --- a/arch/x86/kernel/cpu/common.c +++ b/arch/x86/kernel/cpu/common.c @@ -15,6 +15,7 @@ #include <asm/stackprotector.h> #include <asm/perf_event.h> #include <asm/mmu_context.h> +#include <asm/archrandom.h> #include <asm/hypervisor.h> #include <asm/processor.h> #include <asm/sections.h> @@ -857,6 +858,7 @@ static void __cpuinit identify_cpu(struct cpuinfo_x86 *c) #endif init_hypervisor(c); + x86_init_rdrand(c); /* * Clear/Set all flags overriden by options, need do it |