Jason A. Donenfeld 37608ba315
utsname: contribute changes to RNG ...
On some small machines with little entropy, a quasi-unique hostname is
sometimes a relevant factor. I've seen, for example, 8 character
alpha-numeric serial numbers. In addition, the time at which the hostname
is set is usually a decent measurement of how long early boot took. So,
call add_device_randomness() on new hostnames, which feeds its arguments
to the RNG in addition to a fresh cycle counter.
Low cost hooks like this never hurt and can only ever help, and since
this costs basically nothing for an operation that is never a fast path,
this is an overall easy win.
Cc: Andrew Morton <akpm@linux-foundation.org >
Cc: Dominik Brodowski <linux@dominikbrodowski.net >
Reviewed-by: Kees Cook <keescook@chromium.org >
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com >
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37608ba315