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Subject[PATCH v3 8/9] io_uring/cmd: BPF hook for getsockopt cmd
Date
Add BPF hook support for getsockopts io_uring command. So, BPF cgroups
programs can run when SOCKET_URING_OP_GETSOCKOPT command is executed
through io_uring.

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 a567dd32df00..9e08a14760c3 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>
@@ -184,17 +186,23 @@ 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 (!(issue_flags & IO_URING_F_COMPAT))
+ 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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