Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > linux.kernel > #1668638

Re: [kernel-hardening] Re: [PATCH v4 13/13] random: warn when kernel uses unseeded randomness

Show all headers | View raw

Am Sonntag, 18. Juni 2017, 17:46:25 CEST schrieb Theodore Ts'o:

Hi Theodore,

> > IMHO, users using the get_random_u64 or get_random_u32 are use cases that
> > do not require a fully seeded DRNG thus do not need a cryptographically
> > strong random number. Hence, I would think that the logging should be
> > removed from get_random_u32/u64.
> 
> You are effectively proposing that there ought to be a middle range of
> security between prandom_32, get_random_u32/get_random_u64 and
> get_random_bytes().  I think that's going to lead to all sorts of
> complexity and bugs from people not understanding when they should use
> get_random_u32 vs get_random_bytes versus prandom_u32.  And then we'll
> end up needing to audit all of the callsites for get_random_u32() so
> they don't violate this new usage rule that you are proposing.

I only proposed to get rid of the log messages indicating a non-seeded DRNG.

But you bring up an interesting point: if it is true you say that it is hard 
for people to use differnent types of APIs regarding entropy and random 
numbers right (which I would concur with), and considering that you imply that 
get_random_bytes, get_random_u32 and get_random_u64 have the same security 
strength, why do we have these three APIs to begin with? The get_random_bytes 
API would then be more than enough.

Ciao
Stephan

Back to linux.kernel | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread

Thread

Re: [PATCH v4 13/13] random: warn when kernel uses unseeded  randomness Theodore Ts'o <tytso@mit.edu> - 2017-06-08 10:20 +0200
  Re: [PATCH v4 13/13] random: warn when kernel uses unseeded randomness "Jason A. Donenfeld" <Jason@zx2c4.com> - 2017-06-08 14:10 +0200
  Re: [kernel-hardening] Re: [PATCH v4 13/13] random: warn when kernel uses unseeded randomness Michael Ellerman <mpe@ellerman.id.au> - 2017-06-15 13:10 +0200
    Re: [kernel-hardening] Re: [PATCH v4 13/13] random: warn when kernel uses unseeded randomness Stephan Müller <smueller@chronox.de> - 2017-06-15 14:00 +0200
      Re: [kernel-hardening] Re: [PATCH v4 13/13] random: warn when kernel  uses unseeded randomness Theodore Ts'o <tytso@mit.edu> - 2017-06-18 17:50 +0200
        Re: [kernel-hardening] Re: [PATCH v4 13/13] random: warn when kernel uses unseeded randomness Stephan Müller <smueller@chronox.de> - 2017-06-18 20:00 +0200
          Re: [kernel-hardening] Re: [PATCH v4 13/13] random: warn when kernel  uses unseeded randomness "Jason A. Donenfeld" <Jason@zx2c4.com> - 2017-06-18 21:20 +0200
        Re: [kernel-hardening] Re: [PATCH v4 13/13] random: warn when kernel  uses unseeded randomness "Jason A. Donenfeld" <Jason@zx2c4.com> - 2017-06-18 21:20 +0200

csiph-web