Mark Johnston ebf1041fc8
hv_kvp: Fix some bugs and nits ...
- Use pending_mutex to synchronize several state flags. In particular,
ensure that two threads can't race to open the device file at the same
time.[1]
- Fix an off-by-one in hv_kvp_dev_daemon_read() that would result in a
one-byte OOB read if the caller supplied a large enough read buffer.[2]
- Change the device permissions to 0600: hv_kvp_dev_daemon_read()
returns an error until the owning process registers itself with a
write, so there's no sense in providing read-only access.
- Use bool instead of boolean_t.
- Don't return negative error numbers to userspace.
- Call seldrain() when closing the device.
Reported by: pixelpop [1][2]
MFC after: 2 weeks
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D60387
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Mark Johnston
ebf1041fc8