Messages in this thread | | | From | Hannes Frederic Sowa <> | Subject | Re: [PATCH v3 2/5] random,x86: Add arch_get_slow_rng_u64 | Date | Thu, 17 Jul 2014 20:42:23 +0200 |
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On Thu, Jul 17, 2014, at 19:34, Andy Lutomirski wrote: > On Thu, Jul 17, 2014 at 10:32 AM, Theodore Ts'o <tytso@mit.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.
Bye, Hannes
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