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io_uring/zcrx: check ctrl op payload struct sizes

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Add a build check that ctrl payloads are of the same size and don't grow
struct zcrx_ctrl.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://patch.msgid.link/af66caf9776d18e9ff880ab828eb159a6a03caf5.1774261953.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Pavel Begunkov 2026-03-23 12:44:04 +00:00 committed by Jens Axboe
parent 5c727ce042
commit de6ed1b323
1 changed files with 2 additions and 0 deletions
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io_uring/zcrx.c
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@ -1253,6 +1253,8 @@ int io_zcrx_ctrl(struct io_ring_ctx *ctx, void __user *arg, unsigned nr_args)
struct zcrx_ctrl ctrl;
struct io_zcrx_ifq *zcrx;
BUILD_BUG_ON(sizeof(ctrl.zc_export) != sizeof(ctrl.zc_flush));
if (nr_args)
return -EINVAL;
if (copy_from_user(&ctrl, arg, sizeof(ctrl)))