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Date: Thu, 17 Jul 2014 12:15:41 -0700 From: Andy Lutomirski <luto@...capital.net> To: Hannes Frederic Sowa <hannes@...essinduktion.org> Cc: "Theodore Ts'o" <tytso@....edu>, "H. Peter Anvin" <hpa@...or.com>, Raghavendra K T <raghavendra.kt@...ux.vnet.ibm.com>, Paolo Bonzini <pbonzini@...hat.com>, X86 ML <x86@...nel.org>, Bandan Das <bsd@...hat.com>, Gleb Natapov <gleb@...nel.org>, kvm list <kvm@...r.kernel.org>, Srivatsa Vaddagiri <vatsa@...ux.vnet.ibm.com>, Daniel Borkmann <dborkman@...hat.com>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, Kees Cook <keescook@...omium.org> Subject: Re: [PATCH v3 2/5] random,x86: Add arch_get_slow_rng_u64 On Thu, Jul 17, 2014 at 11:42 AM, Hannes Frederic Sowa <hannes@...essinduktion.org> wrote: > > > On Thu, Jul 17, 2014, at 19:34, Andy Lutomirski wrote: >> On Thu, Jul 17, 2014 at 10:32 AM, Theodore Ts'o <tytso@....edu> wrote: >> > On Thu, Jul 17, 2014 at 10:12:27AM -0700, Andy Lutomirski wrote: >> >> >> >> Unless I'm reading the code wrong, the prandom_reseed_late call can >> >> happen after userspace is running. >> > >> > But there is also the prandom_reseed() call, which happens early. >> > >> >> Right -- I missed that. > > prandom_init is a core_initcall, prandom_reseed is a late_initcall. > During initialization of the network stack we have calls to prandom_u32 > before the late_initcall happens. That said, I think it is not that > important to seed prandom with rdseed/rdrand as security relevant > entropy extraction should always use get_random_bytes(), but we should > do it nonetheless. > Regardless, I don't want to do this as part of this patch series. One thing at a time... --Andy -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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