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the stats and ifstats files in the 3rd level of a netif
are not per connection, but for the interface.
this made fstat fail for /net/ether0/N/*stats where N > 0
as the NETID() bits in the qid didnt compare.
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the kernel would go into endless loop when stating "stats" and "ifstats"
files and the network interface having no connections, or otherwise return
wrong stat info.
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kstrcpy() did not null terminate for < 4 byte buffers. fixed,
but i dont think there is any case where this can happen in
practice.
always set malloctag in kstrdup(), cleanup.
always use ERRMAX bounded kstrcpy() to set up->errstr, q->err
and note[]->msg. paranoia.
instead of silently truncating interface name in netifinit(),
panic the kernel if interface name is too long as this case
is clearly a mistake.
panic kernel when filename is too long for addbootfile() in
devroot. this might happen if your kernel configuration is
messed up.
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in devproc status read handler the p->status, p->text and p->user
could overflow the local statbuf buffer as they where copied into
it with code like: memmove(statbuf+someoff, p->text, strlen(p->text)).
now using readstr() which will truncate if the string is too long.
make strncpy() usage consistent, make sure results are always null
terminated.
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