path: root/crypto/vmac.c
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authorDaniel Borkmann <>2014-08-26 23:16:35 -0400
committerTheodore Ts'o <>2014-10-17 11:37:29 -0400
commitd4c5efdb97773f59a2b711754ca0953f24516739 (patch)
tree83ededeb92d6d529e8081b97b2f9cdf491094b78 /crypto/vmac.c
parent7d1311b93e58ed55f3a31cc8f94c4b8fe988a2b9 (diff)
random: add and use memzero_explicit() for clearing data
zatimend has reported that in his environment (3.16/gcc4.8.3/corei7) memset() calls which clear out sensitive data in extract_{buf,entropy, entropy_user}() in random driver are being optimized away by gcc. Add a helper memzero_explicit() (similarly as explicit_bzero() variants) that can be used in such cases where a variable with sensitive data is being cleared out in the end. Other use cases might also be in crypto code. [ I have put this into lib/string.c though, as it's always built-in and doesn't need any dependencies then. ] Fixes kernel bugzilla: 82041 Reported-by: Signed-off-by: Daniel Borkmann <> Acked-by: Hannes Frederic Sowa <> Cc: Alexey Dobriyan <> Signed-off-by: Theodore Ts'o <> Cc:
Diffstat (limited to 'crypto/vmac.c')
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