The following changes since commit 6e4664525b1db28f8c4e1130957f70a94c19213e:
Linux 3.11 (2013-09-02 13:46:10 -0700)
are available in the git repository at:
git://git.kernel.org/pub/scm/linux/kernel/git/tytso/random.git
tags/random_for_linus
for you to fetch changes up to 392a546dc8368d1745f9891ef3f8f7c380de8650:
random: add debugging code to detect early use of get_random_bytes()
(2013-11-03 18:24:08 -0500)
----------------------------------------------------------------
The /dev/random changes for 3.13 including a number of improvements in
the following areas: performance, avoiding waste of entropy, better
tracking of entropy estimates, support for non-x86 platforms that have
a register which can't be used for fine-grained timekeeping, but which
might be good enough for the random driver.
Also add some printk's so that we can see how quickly /dev/urandom can
get initialized, and when programs try to use /dev/urandom before it
is fully initialized (since this could be a security issue). This
shouldn't be an issue on x86 desktop/laptops --- a test on my Lenovo
T430s laptop shows that /dev/urandom is getting fully initialized
approximately two seconds before the root file system is mounted
read/write --- this may be an issue with ARM and MIPS embedded/mobile
systems, though. These printk's will be a useful canary before
potentially adding a future change to start blocking processes which
try to read from /dev/urandom before it is initialized, which is
something FreeBSD does already for security reasons, and which
security folks have been agitating for Linux to also adopt.
----------------------------------------------------------------
H. Peter Anvin (3):
random: statically compute poolbitshift, poolbytes, poolbits
random: allow fractional bits to be tracked
random: account for entropy loss due to overwrites
Theodore Ts'o (17):
random: run random_int_secret_init() run after all late_initcalls
random: allow architectures to optionally define random_get_entropy()
random: mix in architectural randomness earlier in extract_buf()
random: fix the tracepoint for get_random_bytes(_arch)
random: optimize spinlock use in add_device_randomness()
random: optimize the entropy_store structure
random: cap the rate which the /dev/urandom pool gets reseeded
random: speed up the fast_mix function by a factor of four
random: adjust the generator polynomials in the mixing function slightly
random: drop trickle mode
random: push extra entropy to the output pools
random: convert DEBUG_ENT to tracepoints
random: make add_timer_randomness() fill the nonblocking pool first
random: printk notifications for urandom pool initialization
random: don't zap entropy count in rand_initialize()
random: initialize the last_time field in struct timer_rand_state
random: add debugging code to detect early use of get_random_bytes()
drivers/char/random.c | 652
++++++++++++++++++++++++++++++++-------------------
include/linux/random.h | 1 +
include/linux/timex.h | 14 ++
include/trace/events/random.h | 183 ++++++++++++++-
init/main.c | 2 +
5 files changed, 608 insertions(+), 244 deletions(-)
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