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socket: Split out a getsockname helper for io_uring

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Similar to getsockopt, split out a helper to check security and issue
the operation from the main handler that can be used by io_uring.

Signed-off-by: Gabriel Krisman Bertazi <krisman@suse.de>
Reviewed-by: Kuniyuki Iwashima <kuniyu@google.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Gabriel Krisman Bertazi
2025-11-25 16:18:00 -05:00
committed by Jens Axboe
parent 4677e78800
commit d73c167708
2 changed files with 22 additions and 16 deletions
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2
include/linux/socket.h
View File

@@ -453,6 +453,8 @@ extern int __sys_connect(int fd, struct sockaddr __user *uservaddr,
int addrlen);
extern int __sys_listen(int fd, int backlog);
extern int __sys_listen_socket(struct socket *sock, int backlog);
extern int do_getsockname(struct socket *sock, int peer,
struct sockaddr __user *usockaddr, int __user *usockaddr_len);
extern int __sys_getsockname(int fd, struct sockaddr __user *usockaddr,
int __user *usockaddr_len, int peer);
extern int __sys_socketpair(int family, int type, int protocol,

36
net/socket.c
View File

@@ -2127,6 +2127,25 @@ SYSCALL_DEFINE3(connect, int, fd, struct sockaddr __user *, uservaddr,
return __sys_connect(fd, uservaddr, addrlen);
}
int do_getsockname(struct socket *sock, int peer,
struct sockaddr __user *usockaddr, int __user *usockaddr_len)
{
struct sockaddr_storage address;
int err;
if (peer)
err = security_socket_getpeername(sock);
else
err = security_socket_getsockname(sock);
if (err)
return err;
err = READ_ONCE(sock->ops)->getname(sock, (struct sockaddr *)&address, peer);
if (err < 0)
return err;
/* "err" is actually length in this case */
return move_addr_to_user(&address, err, usockaddr, usockaddr_len);
}
/*
* Get the remote or local address ('name') of a socket object. Move the
* obtained name to user space.
@@ -2135,29 +2154,14 @@ int __sys_getsockname(int fd, struct sockaddr __user *usockaddr,
int __user *usockaddr_len, int peer)
{
struct socket *sock;
struct sockaddr_storage address;
CLASS(fd, f)(fd);
int err;
if (fd_empty(f))
return -EBADF;
sock = sock_from_file(fd_file(f));
if (unlikely(!sock))
return -ENOTSOCK;
if (peer)
err = security_socket_getpeername(sock);
else
err = security_socket_getsockname(sock);
if (err)
return err;
err = READ_ONCE(sock->ops)->getname(sock, (struct sockaddr *)&address, peer);
if (err < 0)
return err;
/* "err" is actually length in this case */
return move_addr_to_user(&address, err, usockaddr, usockaddr_len);
return do_getsockname(sock, peer, usockaddr, usockaddr_len);
}
SYSCALL_DEFINE3(getsockname, int, fd, struct sockaddr __user *, usockaddr,