linux-kernel - [GIT PULL] random number generator fixes for 5.18-rc3

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Date:   Sat, 16 Apr 2022 15:13:18 +0200
From:   "Jason A. Donenfeld" <Jason@...c4.com>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     linux-kernel@...r.kernel.org
Subject: [GIT PULL] random number generator fixes for 5.18-rc3

Hi Linus,

Please pull the following three fixes to the RNG for 5.18-rc3:

- Per your suggestion, random reads now won't fail if there's a page fault
  after some non-zero amount of data has been read, which makes the behavior
  consistent with all other reads in the kernel.

- Rather than an inconsistent mix of random_get_entropy() returning an
  unsigned long or a cycles_t, now it just returns an unsigned long.

- A memcpy() was replaced with an memmove(), because the addresses are
  sometimes overlapping. In practice the destination is always before the
  source, so not really an issue, but better to be correct than not.

Thanks,
Jason

The following changes since commit a19944809fe9942e6a96292490717904d0690c21:

  Merge tag 'hardening-v5.18-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux (2022-04-12 14:29:40 -1000)

are available in the Git repository at:

  https://git.kernel.org/pub/scm/linux/kernel/git/crng/random.git tags/random-5.18-rc3-for-linus

for you to fetch changes up to 35a33ff3807d3adb9daaf937f5bca002ffa9f84e:

  random: use memmove instead of memcpy for remaining 32 bytes (2022-04-16 12:53:31 +0200)

----------------------------------------------------------------
Random number generator fixes for Linux 5.18-rc3.
----------------------------------------------------------------

Jason A. Donenfeld (3):
      random: allow partial reads if later user copies fail
      random: make random_get_entropy() return an unsigned long
      random: use memmove instead of memcpy for remaining 32 bytes

 drivers/char/random.c | 44 ++++++++++++++++++++------------------------
 include/linux/timex.h |  2 +-
 2 files changed, 21 insertions(+), 25 deletions(-)