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authorStephan Mueller <smueller@chronox.de>2014-08-26 12:29:45 +0400
committerHerbert Xu <herbert@gondor.apana.org.au>2014-08-26 12:58:05 +0400
commitb9347aff91ce4789619168539f08202d8d6a1177 (patch)
treed38c52fb8408e6ce77cc61735c2f68d8a2e1b949 /drivers/crypto
parent7c8ae03f41e635813b777a0989d8ac1ff5a8494e (diff)
downloadlinux-b9347aff91ce4789619168539f08202d8d6a1177.tar.xz
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>
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