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 <dmnk@google.com>
Link: https://patch.msgid.link/20261022232120.2537530-1-dmnk@google.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>

0 files changed, 0 insertions, 0 deletions