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| author | Ryan Ware <ware@linux.intel.com> | 2016-02-11 15:58:44 -0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2016-02-17 12:34:39 -0800 |
| commit | 6121dabef629c5b584abd617bba87f420b7f4011 (patch) | |
| tree | 53fe9c3d8e31e91262ab63ce42b0cad1bdc33afd /crypto | |
| parent | 2399c5808f1df80712f91e7570ed6ca6abb48b6f (diff) | |
| download | lwn-6121dabef629c5b584abd617bba87f420b7f4011.tar.gz lwn-6121dabef629c5b584abd617bba87f420b7f4011.zip | |
EVM: Use crypto_memneq() for digest comparisons
commit 613317bd212c585c20796c10afe5daaa95d4b0a1 upstream.
This patch fixes vulnerability CVE-2016-2085. The problem exists
because the vm_verify_hmac() function includes a use of memcmp().
Unfortunately, this allows timing side channel attacks; specifically
a MAC forgery complexity drop from 2^128 to 2^12. This patch changes
the memcmp() to the cryptographically safe crypto_memneq().
Reported-by: Xiaofei Rex Guo <xiaofei.rex.guo@intel.com>
Signed-off-by: Ryan Ware <ware@linux.intel.com>
Signed-off-by: Mimi Zohar <zohar@linux.vnet.ibm.com>
Signed-off-by: James Morris <james.l.morris@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'crypto')
0 files changed, 0 insertions, 0 deletions