io_uring/net: verify msghdr before copying iovec

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Normally, net/ would verify msghdr before importing iovec, for example
see copy_msghdr_from_user(), which further assumed by __copy_msghdr()
validating msg->msg_iovlen.

io_uring does it in reverse order, which is fine, but it'll be more
convenient for flip it so that the iovec business is done at the end and
eventually can be nicely pulled out of msghdr parsing section and
thought as a sepaarate step. That also makes structure accesses more
localised, which should be better for caches.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/cd35dc1b48d4e6e31f59ae7304c037fbe8a3fd3d.1740569495.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>

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Pavel Begunkov 2025-02-26 11:41:18 +00:00 • committed by Jens Axboe

parent a223e96f73

commit 00a9143d98

1 changed files with 18 additions and 25 deletions

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io_uring/net.c

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