Alan Stern wrote:
On Fri, 14 Dec 2007, Phil Endecott wrote:
OK, but the kernel driver can still look in the buffer even though it
doesn't know how much, if any, of it is actually valid; it might do
this as a "last chance" when talking to a broken device, e.g. my
printer. Right?
Yes, the kernel could copy the entire buffer back to userspace
regardless of the amount of data transferred. This would exert a
certain toll in operating speed, because the kernel would have to clear
the contents of the buffer beforehand to avoid a security leak.
Yes, good point. Not worth doing.
Phil.
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