x86, random: Enable the RDSEED instruction
Upcoming Intel silicon adds a new RDSEED instruction, which is similar to RDRAND but provides a stronger guarantee: unlike RDRAND, RDSEED will always reseed the PRNG from the true random number source between each read. Thus, the output of RDSEED is guaranteed to be 100% entropic, unlike RDRAND which is only architecturally guaranteed to be 1/512 entropic (although in practice is much more.) The RDSEED instruction takes the same time to execute as RDRAND, but RDSEED unlike RDRAND can legitimately return failure (CF=0) due to entropy exhaustion if too many threads on too many cores are hammering the RDSEED instruction at the same time. Therefore, we have to be more conservative and only use it in places where we can tolerate failures. This patch introduces the primitives arch_get_random_seed_{int,long}() but does not use it yet. Signed-off-by: H. Peter Anvin <hpa@linux.intel.com> Reviewed-by: Ingo Molnar <mingo@kernel.org> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Paul Mackerras <paulus@samba.org> Cc: Michael Ellerman <michael@ellerman.id.au> Signed-off-by: Theodore Ts'o <tytso@mit.edu>
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@ -27,6 +27,15 @@ static inline int arch_get_random_int(unsigned int *v)
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int powernv_get_random_long(unsigned long *v);
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static inline int arch_get_random_seed_long(unsigned long *v)
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{
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return 0;
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}
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static inline int arch_get_random_seed_int(unsigned int *v)
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{
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return 0;
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}
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#endif /* CONFIG_ARCH_RANDOM */
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#endif /* _ASM_POWERPC_ARCHRANDOM_H */
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@ -1,7 +1,7 @@
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/*
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* This file is part of the Linux kernel.
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*
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* Copyright (c) 2011, Intel Corporation
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* Copyright (c) 2011-2014, Intel Corporation
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* Authors: Fenghua Yu <fenghua.yu@intel.com>,
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* H. Peter Anvin <hpa@linux.intel.com>
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*
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@ -31,10 +31,13 @@
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#define RDRAND_RETRY_LOOPS 10
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#define RDRAND_INT ".byte 0x0f,0xc7,0xf0"
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#define RDSEED_INT ".byte 0x0f,0xc7,0xf8"
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#ifdef CONFIG_X86_64
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# define RDRAND_LONG ".byte 0x48,0x0f,0xc7,0xf0"
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# define RDSEED_LONG ".byte 0x48,0x0f,0xc7,0xf8"
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#else
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# define RDRAND_LONG RDRAND_INT
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# define RDSEED_LONG RDSEED_INT
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#endif
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#ifdef CONFIG_ARCH_RANDOM
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@ -53,6 +56,16 @@ static inline int rdrand_long(unsigned long *v)
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return ok;
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}
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/* A single attempt at RDSEED */
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static inline bool rdseed_long(unsigned long *v)
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{
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unsigned char ok;
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asm volatile(RDSEED_LONG "\n\t"
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"setc %0"
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: "=qm" (ok), "=a" (*v));
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return ok;
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}
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#define GET_RANDOM(name, type, rdrand, nop) \
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static inline int name(type *v) \
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{ \
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@ -70,16 +83,35 @@ static inline int name(type *v) \
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return ok; \
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}
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#define GET_SEED(name, type, rdseed, nop) \
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static inline int name(type *v) \
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{ \
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unsigned char ok; \
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alternative_io("movb $0, %0\n\t" \
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nop, \
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rdseed "\n\t" \
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"setc %0", \
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X86_FEATURE_RDSEED, \
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ASM_OUTPUT2("=q" (ok), "=a" (*v))); \
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return ok; \
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}
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#ifdef CONFIG_X86_64
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GET_RANDOM(arch_get_random_long, unsigned long, RDRAND_LONG, ASM_NOP5);
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GET_RANDOM(arch_get_random_int, unsigned int, RDRAND_INT, ASM_NOP4);
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GET_SEED(arch_get_random_seed_long, unsigned long, RDSEED_LONG, ASM_NOP5);
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GET_SEED(arch_get_random_seed_int, unsigned int, RDSEED_INT, ASM_NOP4);
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#else
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GET_RANDOM(arch_get_random_long, unsigned long, RDRAND_LONG, ASM_NOP3);
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GET_RANDOM(arch_get_random_int, unsigned int, RDRAND_INT, ASM_NOP3);
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GET_SEED(arch_get_random_seed_long, unsigned long, RDSEED_LONG, ASM_NOP4);
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GET_SEED(arch_get_random_seed_int, unsigned int, RDSEED_INT, ASM_NOP4);
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#endif /* CONFIG_X86_64 */
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#else
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@ -89,6 +121,11 @@ static inline int rdrand_long(unsigned long *v)
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return 0;
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}
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static inline bool rdseed_long(unsigned long *v)
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{
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return 0;
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}
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#endif /* CONFIG_ARCH_RANDOM */
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extern void x86_init_rdrand(struct cpuinfo_x86 *c);
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@ -88,6 +88,14 @@ static inline int arch_get_random_int(unsigned int *v)
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{
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return 0;
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}
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static inline int arch_get_random_seed_long(unsigned long *v)
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{
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return 0;
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}
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static inline int arch_get_random_seed_int(unsigned int *v)
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{
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return 0;
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}
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#endif
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/* Pseudo random number generator from numerical recipes. */
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