diff options
| author | Changbin Du <changbin.du@gmail.com> | 2021-06-11 22:29:59 +0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-06-23 14:42:44 +0200 |
| commit | 4abfd597fe60bfa677bfe177e3a6a551e3a3f792 (patch) | |
| tree | 45ee10fcdb1ee9e83e54834cb10bbcbd13e2def0 /include/linux | |
| parent | 6a4b39944e2fb18b70c66dd435210bc5c53c89bd (diff) | |
net: make get_net_ns return error if NET_NS is disabled
[ Upstream commit ea6932d70e223e02fea3ae20a4feff05d7c1ea9a ]
There is a panic in socket ioctl cmd SIOCGSKNS when NET_NS is not enabled.
The reason is that nsfs tries to access ns->ops but the proc_ns_operations
is not implemented in this case.
[7.670023] Unable to handle kernel NULL pointer dereference at virtual address 00000010
[7.670268] pgd = 32b54000
[7.670544] [00000010] *pgd=00000000
[7.671861] Internal error: Oops: 5 [#1] SMP ARM
[7.672315] Modules linked in:
[7.672918] CPU: 0 PID: 1 Comm: systemd Not tainted 5.13.0-rc3-00375-g6799d4f2da49 #16
[7.673309] Hardware name: Generic DT based system
[7.673642] PC is at nsfs_evict+0x24/0x30
[7.674486] LR is at clear_inode+0x20/0x9c
The same to tun SIOCGSKNS command.
To fix this problem, we make get_net_ns() return -EINVAL when NET_NS is
disabled. Meanwhile move it to right place net/core/net_namespace.c.
Signed-off-by: Changbin Du <changbin.du@gmail.com>
Fixes: c62cce2caee5 ("net: add an ioctl to get a socket network namespace")
Cc: Cong Wang <xiyou.wangcong@gmail.com>
Cc: Jakub Kicinski <kuba@kernel.org>
Cc: David Laight <David.Laight@ACULAB.COM>
Cc: Christian Brauner <christian.brauner@ubuntu.com>
Suggested-by: Jakub Kicinski <kuba@kernel.org>
Acked-by: Christian Brauner <christian.brauner@ubuntu.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/socket.h | 2 |
1 files changed, 0 insertions, 2 deletions
diff --git a/include/linux/socket.h b/include/linux/socket.h index e9cb30d8cbfb..9aa530d497da 100644 --- a/include/linux/socket.h +++ b/include/linux/socket.h @@ -437,6 +437,4 @@ extern int __sys_getpeername(int fd, struct sockaddr __user *usockaddr, extern int __sys_socketpair(int family, int type, int protocol, int __user *usockvec); extern int __sys_shutdown(int fd, int how); - -extern struct ns_common *get_net_ns(struct ns_common *ns); #endif /* _LINUX_SOCKET_H */ |