Messages in this thread Patch in this message | | | From | Breno Leitao <> | Subject | [PATCH v2 7/8] io_uring/cmd: BPF hook for getsockopt cmd | Date | Tue, 8 Aug 2023 06:40:47 -0700 |
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Add BPF hooks support for getsockopts io_uring command. So, bpf cgroups programs can run when SOCKET_URING_OP_GETSOCKOPT command is called.
This implementation follows a similar approach to what __sys_getsockopt() does, but, using USER_SOCKPTR() for optval instead of kernel pointer.
Signed-off-by: Breno Leitao <leitao@debian.org> --- io_uring/uring_cmd.c | 18 +++++++++++++----- 1 file changed, 13 insertions(+), 5 deletions(-)
diff --git a/io_uring/uring_cmd.c b/io_uring/uring_cmd.c index dbba005a7290..3693e5779229 100644 --- a/io_uring/uring_cmd.c +++ b/io_uring/uring_cmd.c @@ -5,6 +5,8 @@ #include <linux/io_uring.h> #include <linux/security.h> #include <linux/nospec.h> +#include <linux/compat.h> +#include <linux/bpf-cgroup.h> #include <uapi/linux/io_uring.h> #include <uapi/asm-generic/ioctls.h> @@ -179,17 +181,23 @@ static inline int io_uring_cmd_getsockopt(struct socket *sock, if (err) return err; - if (level == SOL_SOCKET) { + err = -EOPNOTSUPP; + if (level == SOL_SOCKET) err = sk_getsockopt(sock->sk, level, optname, USER_SOCKPTR(optval), KERNEL_SOCKPTR(&optlen)); - if (err) - return err; + if (!in_compat_syscall()) + err = BPF_CGROUP_RUN_PROG_GETSOCKOPT(sock->sk, level, + optname, + USER_SOCKPTR(optval), + KERNEL_SOCKPTR(&optlen), + optlen, err); + + if (!err) return optlen; - } - return -EOPNOTSUPP; + return err; } static inline int io_uring_cmd_setsockopt(struct socket *sock, -- 2.34.1
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