Alan Somers ff1a307801 lio_listio: validate aio_lio_opcode
Previously, we would accept any kind of LIO_* opcode, including ones
that were intended for in-kernel use only like LIO_SYNC (which is not
defined in userland).  The situation became more serious with
022ca2fc7fe08d51f33a1d23a9be49e6d132914e.  After that revision, setting
aio_lio_opcode to LIO_WRITEV or LIO_READV would trigger an assertion.

Note that POSIX does not specify what should happen if aio_lio_opcode is
invalid.

MFC-with:	022ca2fc7fe08d51f33a1d23a9be49e6d132914e
Reviewed by:	jhb, tmunro, 0mp
Differential Revision:	<https://reviews.freebsd.org/D28078
2021-01-11 19:53:01 -07:00
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