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Date: Tue, 12 Apr 2022 09:30:40 -0700 From: Dylan Yudaken <dylany@...com> To: <io-uring@...r.kernel.org> CC: <axboe@...nel.dk>, <asml.silence@...il.com>, <linux-kernel@...r.kernel.org>, <kernel-team@...com>, Dylan Yudaken <dylany@...com> Subject: [PATCH 2/4] io_uring: verify that resv2 is 0 in io_uring_rsrc_update2 Verify that the user does not pass in anything but 0 for this field. Fixes: 992da01aa932 ("io_uring: change registration/upd/rsrc tagging ABI") Signed-off-by: Dylan Yudaken <dylany@...com> --- fs/io_uring.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/fs/io_uring.c b/fs/io_uring.c index 58bfa71fe3b6..e899192ffb77 100644 --- a/fs/io_uring.c +++ b/fs/io_uring.c @@ -6839,6 +6839,7 @@ static int io_files_update(struct io_kiocb *req, unsigned int issue_flags) up.nr = 0; up.tags = 0; up.resv = 0; + up.resv2 = 0; io_ring_submit_lock(ctx, needs_lock); ret = __io_register_rsrc_update(ctx, IORING_RSRC_FILE, @@ -11423,7 +11424,7 @@ static int io_register_files_update(struct io_ring_ctx *ctx, void __user *arg, memset(&up, 0, sizeof(up)); if (copy_from_user(&up, arg, sizeof(struct io_uring_rsrc_update))) return -EFAULT; - if (up.resv) + if (up.resv || up.resv2) return -EINVAL; return __io_register_rsrc_update(ctx, IORING_RSRC_FILE, &up, nr_args); } @@ -11437,7 +11438,7 @@ static int io_register_rsrc_update(struct io_ring_ctx *ctx, void __user *arg, return -EINVAL; if (copy_from_user(&up, arg, sizeof(up))) return -EFAULT; - if (!up.nr || up.resv) + if (!up.nr || up.resv || up.resv2) return -EINVAL; return __io_register_rsrc_update(ctx, type, &up, up.nr); } -- 2.30.2
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