io_uring/bpf_filter: allow filtering on contents of struct open_how

This adds custom filtering for IORING_OP_OPENAT and IORING_OP_OPENAT2,
where the open_how flags, mode, and resolve can be checked by filters.

Signed-off-by: Jens Axboe <axboe@kernel.dk>

1 files changed, 9 insertions, 0 deletions

diff --git a/io_uring/openclose.c b/io_uring/openclose.c
index 15dde9bd6ff6..31c687adf873 100644
--- a/io_uring/openclose.c
+++ b/io_uring/openclose.c
@@ -85,6 +85,15 @@ static int __io_openat_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe
 	return 0;
 }
 
+void io_openat_bpf_populate(struct io_uring_bpf_ctx *bctx, struct io_kiocb *req)
+{
+	struct io_open *open = io_kiocb_to_cmd(req, struct io_open);
+
+	bctx->open.flags = open->how.flags;
+	bctx->open.mode = open->how.mode;
+	bctx->open.resolve = open->how.resolve;
+}
+
 int io_openat_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
 {
 	struct io_open *open = io_kiocb_to_cmd(req, struct io_open);