From 33a154a96e71a34a1bcca9f40da343dbbf7b38b4 Mon Sep 17 00:00:00 2001 From: Alexei Starovoitov Date: Thu, 1 Oct 2026 14:52:55 +0000 Subject: selftests/bpf: Test packet range of pointers sharing an id Add tests where two packet pointers share an id and tightening one pointer's umax from its var_off would put it less than their constant distance from the other's umax: with an index & 0x38 capped at 50, the base pointer keeps umax 50, so the pointer 8 bytes further on must keep umax 58, even though its known bits allow at most 56. These refused a valid program or accepted an out-of-bounds access before the fix: - check the advanced copy, load through the base: valid, was refused; - check the base, load the byte at base + 1 through a copy advanced by 8: was accepted; - check base + 4, load 4 bytes at base + 2 through base + 8: reads two bytes past the checked range, was accepted; - the same as the second with data_meta pointers checked against data: was accepted. These pass with and without the fix and cover nearby paths: - subtract an unknown scalar from a checked pointer and load below it (the range is kept across a new id); - reach a load through two paths whose checks cover 8 and 7 bytes after the loaded pointer; the second path must not be pruned by the first; - spill a copy of a pointer, check the pointer, fill the copy and load one byte past the checked range: the load is refused, and the copy has the range of the check. Signed-off-by: Alexei Starovoitov Link: https://lore.kernel.org/bpf/20261001145255.855630-2-alexei.starovoitov@gmail.com Signed-off-by: Kumar Kartikeya Dwivedi --- io_uring/net.h | 79 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 79 insertions(+) create mode 100644 io_uring/net.h (limited to 'io_uring/net.h') diff --git a/io_uring/net.h b/io_uring/net.h new file mode 100644 index 000000000..51fda715d --- /dev/null +++ b/io_uring/net.h @@ -0,0 +1,79 @@ +// SPDX-License-Identifier: GPL-2.0 + +#include +#include +#include +#include + +struct io_async_msghdr { +#if defined(CONFIG_NET) + struct iou_vec vec; + + struct_group(clear, + int namelen; + struct iovec fast_iov; + __kernel_size_t controllen; + __kernel_size_t payloadlen; + struct sockaddr __user *uaddr; + struct msghdr msg; + struct sockaddr_storage addr; + ); +#else + struct_group(clear); +#endif +}; + +#if defined(CONFIG_NET) + +int io_shutdown_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe); +int io_shutdown(struct io_kiocb *req, unsigned int issue_flags); + +void io_sendmsg_recvmsg_cleanup(struct io_kiocb *req); +int io_sendmsg_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe); +int io_sendmsg(struct io_kiocb *req, unsigned int issue_flags); + +int io_send(struct io_kiocb *req, unsigned int issue_flags); + +int io_recvmsg_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe); +int io_recvmsg(struct io_kiocb *req, unsigned int issue_flags); +int io_recv(struct io_kiocb *req, unsigned int issue_flags); + +void io_sendrecv_fail(struct io_kiocb *req); + +int io_accept_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe); +int io_accept(struct io_kiocb *req, unsigned int issue_flags); + +int io_socket_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe); +int io_socket(struct io_kiocb *req, unsigned int issue_flags); +void io_socket_bpf_populate(struct io_uring_bpf_ctx *bctx, struct io_kiocb *req); +void io_connect_bpf_populate(struct io_uring_bpf_ctx *bctx, struct io_kiocb *req); + +int io_connect_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe); +int io_connect(struct io_kiocb *req, unsigned int issue_flags); + +int io_sendmsg_zc(struct io_kiocb *req, unsigned int issue_flags); +int io_send_zc_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe); +void io_send_zc_cleanup(struct io_kiocb *req); + +int io_bind_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe); +int io_bind(struct io_kiocb *req, unsigned int issue_flags); + +int io_listen_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe); +int io_listen(struct io_kiocb *req, unsigned int issue_flags); + +void io_netmsg_cache_free(const void *entry); +#else +static inline void io_netmsg_cache_free(const void *entry) +{ +} +static inline void io_socket_bpf_populate(struct io_uring_bpf_ctx *bctx, + struct io_kiocb *req) +{ +} + +static inline void io_connect_bpf_populate(struct io_uring_bpf_ctx *bctx, + struct io_kiocb *req) +{ +} + +#endif -- cgit v1.3.1