sunrpc: use constant time memory comparison for mac
Otherwise, we enable a MAC forgery via timing attack. Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com> Cc: "J. Bruce Fields" <bfields@fieldses.org> Cc: Jeff Layton <jlayton@poochiereds.net> Cc: Trond Myklebust <trond.myklebust@primarydata.com> Cc: Anna Schumaker <anna.schumaker@netapp.com> Cc: linux-nfs@vger.kernel.org Cc: stable@vger.kernel.org Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
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