tree d38c52fb8408e6ce77cc61735c2f68d8a2e1b949
parent 7c8ae03f41e635813b777a0989d8ac1ff5a8494e
author Stephan Mueller <smueller@chronox.de> 1409041785 +0200
committer Herbert Xu <herbert@gondor.apana.org.au> 1409043485 +0800

crypto: drbg - fix maximum value checks on 32 bit systems

The maximum values for additional input string or generated blocks is
larger than 1<<32. To ensure a sensible value on 32 bit systems, return
SIZE_MAX on 32 bit systems. This value is lower than the maximum
allowed values defined in SP800-90A. The standard allow lower maximum
values, but not larger values.

SIZE_MAX - 1 is used for drbg_max_addtl to allow
drbg_healthcheck_sanity to check the enforcement of the variable
without wrapping.

Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
Reported-by: kbuild test robot <fengguang.wu@intel.com>
Signed-off-by: Stephan Mueller <smueller@chronox.de>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>