[9fans] a security problem in /sys/log/*

[arisawa]

Hello,

I found an error message in /sys/log/cpu such that
al Mar 19 15:25:16 can't authenticate: al: auth_proxy rpc write: 
p9...@aichi-u.ac.jp p9...@aichi-u.ac.jp: no key matches user=arisawa 
password=xxxxxxx proto=p9sk1 dom=a
where xxxxxxx is my password.

I suspect the message came from
flog("%d: no key matches %A %A %A %A", ki->fss->seqnum, attr0, attr1, attr2, 
attr3);
in /sys/src/cmd/auth/factotum/util.c

I think better message is desired.

Kenji Arisawa