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In reaction to the fixes to address CVE-2018-1108, some Linux 

distributions that have certain systemd versions in some cases
 combined with patches to libcrypt for FIPS/FEDRAMP compliance, have
 led to boot-time stalls for some hardware.  The reaction by some
 distros and Linux sysadmins has been to install packages that try to
 do complicated things with the CPU and hope that leads to randomness.
 To mitigate this, if RDRAND is available, mix it into entropy provided
 by userspace.  It won't hurt. and it will probably help.
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Merge tag 'random_for_linus_stable' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/random

Pull random fixes from Ted Ts'o:
 "In reaction to the fixes to address CVE-2018-1108, some Linux
  distributions that have certain systemd versions in some cases
  combined with patches to libcrypt for FIPS/FEDRAMP compliance, have
  led to boot-time stalls for some hardware.

  The reaction by some distros and Linux sysadmins has been to install
  packages that try to do complicated things with the CPU and hope that
  leads to randomness.

  To mitigate this, if RDRAND is available, mix it into entropy provided
  by userspace. It won't hurt, and it will probably help"

* tag 'random_for_linus_stable' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/random:
  random: mix rdrand with entropy sent in from userspace
This commit is contained in:
Linus Torvalds 2018-07-28 19:40:06 -07:00
parent 2ffb57dfa7 81e69df38e
commit a26fb01c28
1 changed files with 9 additions and 1 deletions
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10
drivers/char/random.c
View File

@ -1895,14 +1895,22 @@ static int
write_pool(struct entropy_store *r, const char __user *buffer, size_t count)
{
size_t bytes;
__u32 buf[16];
__u32 t, buf[16];
const char __user *p = buffer;
while (count > 0) {
int b, i = 0;
bytes = min(count, sizeof(buf));
if (copy_from_user(&buf, p, bytes))
return -EFAULT;
for (b = bytes ; b > 0 ; b -= sizeof(__u32), i++) {
if (!arch_get_random_int(&t))
break;
buf[i] ^= t;
}
count -= bytes;
p += bytes;