Autzoo.856
net.v7bugs,NET.v7bugs
utzoo!henry
Wed Aug 5 21:27:30 1981
ioctl speed-code checking
Nowhere in the V7 kernel does anything ever check that the speed codes
handed to a tty ioctl are valid (i.e. in the range 0..15). Quite by
accident, all this will do to a DH or a DZ is screw up the line in
question. But there is obviously room for all sorts of trouble here.
The simplest fix is to change the lines in dev/tty.c/ttioccomm(), about
line 236, that read:
tp->t_ispeed = iocb.ioc_ispeed;
tp->t_ospeed = iocb.ioc_ospeed;
to read:
tp->t_ispeed = iocb.ioc_ispeed&017;
tp->t_ospeed = iocb.ioc_ospeed&017;
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