ipfilter: Prevent stack buffer overflow
When copying ipfs data from user space, don't just check that the payload
length is nonzero, but also that it does not exceed the size of the stack
buffer we're copying it into.
While we're at it, use a union to create a buffer of the exact size we
need instead of guessing that 2048 will be enough (and not too much).
Finally, check the size of the payload once it gets to where it's used.
MFC after: 3 days
Reported by: Ilja Van Sprundel <ivansprundel at ioactive.com>
Reviewed by: cy
Differential Revision: https://reviews.freebsd.org/D54194
makeman.lua: Update for src.conf in the src tree
Copy the text change from the shell makeman to makeman.lua.
Fixes: dd8c666d8b78 ("src.sys.mk: Support src.conf in SRCTOP")
Sponsored by: The FreeBSD Foundation
