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Fix things so the choice of whether or not to trust RDRAND to

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initialize the CRNG is configurable via the boot option
 random.trust_cpu={on,off}
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Merge tag 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/random

Pull random driver fix from Ted Ts'o:
 "Fix things so the choice of whether or not to trust RDRAND to
  initialize the CRNG is configurable via the boot option
  random.trust_cpu={on,off}"

* tag 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/random:
  random: make CPU trust a boot parameter
This commit is contained in:
Linus Torvalds 2018-09-09 05:54:05 -07:00
commit 3243a89dcb
3 changed files with 16 additions and 5 deletions
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6
Documentation/admin-guide/kernel-parameters.txt
View File

@ -3523,6 +3523,12 @@
ramdisk_size= [RAM] Sizes of RAM disks in kilobytes
See Documentation/blockdev/ramdisk.txt.
random.trust_cpu={on,off}
[KNL] Enable or disable trusting the use of the
CPU's random number generator (if available) to
fully seed the kernel's CRNG. Default is controlled
by CONFIG_RANDOM_TRUST_CPU.
ras=option[,option,...] [KNL] RAS-specific options
cec_disable [X86]

4
drivers/char/Kconfig
View File

@ -566,5 +566,5 @@ config RANDOM_TRUST_CPU
that CPU manufacturer (perhaps with the insistence or mandate
of a Nation State's intelligence or law enforcement agencies)
has not installed a hidden back door to compromise the CPU's
random number generation facilities.
random number generation facilities. This can also be configured
at boot with "random.trust_cpu=on/off".

11
drivers/char/random.c
View File

@ -779,6 +779,13 @@ static struct crng_state **crng_node_pool __read_mostly;
static void invalidate_batched_entropy(void);
static bool trust_cpu __ro_after_init = IS_ENABLED(CONFIG_RANDOM_TRUST_CPU);
static int __init parse_trust_cpu(char *arg)
{
return kstrtobool(arg, &trust_cpu);
}
early_param("random.trust_cpu", parse_trust_cpu);
static void crng_initialize(struct crng_state *crng)
{
int i;
@ -799,12 +806,10 @@ static void crng_initialize(struct crng_state *crng)
}
crng->state[i] ^= rv;
}
#ifdef CONFIG_RANDOM_TRUST_CPU
if (arch_init) {
if (trust_cpu && arch_init) {
crng_init = 2;
pr_notice("random: crng done (trusting CPU's manufacturer)\n");
}
#endif
crng->init_time = jiffies - CRNG_RESEED_INTERVAL - 1;
}