From e66907c3ba229399ecfb4ef032b95a4a071c894e Mon Sep 17 00:00:00 2001 From: Dominik Maier Date: Fri, 23 Oct 2026 01:21:20 +0200 Subject: [PATCH] io_uring/net: mask socket type with SOCK_TYPE_MASK in io_socket_bpf_populate() When an IORING_OP_SOCKET request is prepared in io_socket_prep(), sock->type retains creation flags such as SOCK_CLOEXEC and SOCK_NONBLOCK until __sys_socket_file() masks them off with SOCK_TYPE_MASK during execution. However, io_socket_bpf_populate() copies sock->type into bctx->socket.type without masking off ~SOCK_TYPE_MASK. As a result, a cBPF filter inspecting bctx->socket.type against socket types such as SOCK_DGRAM or SOCK_STREAM can be bypassed by ORing SOCK_CLOEXEC or SOCK_NONBLOCK into the socket type. Mask sock->type with SOCK_TYPE_MASK when populating bctx->socket.type. Fixes: cff1c26b4223 ("io_uring/net: allow filtering on IORING_OP_SOCKET data") Assisted-by: ARTIST LLM Signed-off-by: Dominik Maier Link: https://patch.msgid.link/20261022232120.2537530-1-dmnk@google.com Signed-off-by: Jens Axboe --- io_uring/net.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/io_uring/net.c b/io_uring/net.c index e332b3a2ad3e..e0f27093b385 100644 --- a/io_uring/net.c +++ b/io_uring/net.c @@ -1734,7 +1734,7 @@ void io_socket_bpf_populate(struct io_uring_bpf_ctx *bctx, struct io_kiocb *req) struct io_socket *sock = io_kiocb_to_cmd(req, struct io_socket); bctx->socket.family = sock->domain; - bctx->socket.type = sock->type; + bctx->socket.type = sock->type & SOCK_TYPE_MASK; bctx->socket.protocol = sock->protocol; }