tree: https://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next.git master head: 4b8e6ac41a594ea67ded6af6af5935f03221ea4c commit: ccf8dbcd062a930e64741c939ca784d15316aa0c [375/376] rtnetlink: Remove VLA usage config: um-x86_64_defconfig (attached as .config) compiler: gcc-7 (Debian 7.3.0-16) 7.3.0 reproduce: git checkout ccf8dbcd062a930e64741c939ca784d15316aa0c # save the attached .config to linux build tree make ARCH=um SUBARCH=x86_64
All warnings (new ones prefixed by >>):
net/core/rtnetlink.c: In function 'rtnl_newlink':
>> net/core/rtnetlink.c:3099:1: warning: the frame size of 1280 bytes is larger
>> than 1024 bytes [-Wframe-larger-than=]
}
^
vim +3099 net/core/rtnetlink.c
e7ed828f1 Vlad Dogaru 2011-01-13 2842
c21ef3e34 David Ahern 2017-04-16 2843 static int rtnl_newlink(struct
sk_buff *skb, struct nlmsghdr *nlh,
c21ef3e34 David Ahern 2017-04-16 2844 struct
netlink_ext_ack *extack)
38f7b870d Patrick McHardy 2007-06-13 2845 {
3b1e0a655 YOSHIFUJI Hideaki 2008-03-26 2846 struct net *net =
sock_net(skb->sk);
38f7b870d Patrick McHardy 2007-06-13 2847 const struct rtnl_link_ops *ops;
ba7d49b1f Jiri Pirko 2014-01-22 2848 const struct rtnl_link_ops
*m_ops = NULL;
38f7b870d Patrick McHardy 2007-06-13 2849 struct net_device *dev;
ba7d49b1f Jiri Pirko 2014-01-22 2850 struct net_device *master_dev =
NULL;
38f7b870d Patrick McHardy 2007-06-13 2851 struct ifinfomsg *ifm;
38f7b870d Patrick McHardy 2007-06-13 2852 char kind[MODULE_NAME_LEN];
38f7b870d Patrick McHardy 2007-06-13 2853 char ifname[IFNAMSIZ];
38f7b870d Patrick McHardy 2007-06-13 2854 struct nlattr *tb[IFLA_MAX+1];
38f7b870d Patrick McHardy 2007-06-13 2855 struct nlattr
*linkinfo[IFLA_INFO_MAX+1];
5517750f0 Tom Gundersen 2014-07-14 2856 unsigned char name_assign_type
= NET_NAME_USER;
38f7b870d Patrick McHardy 2007-06-13 2857 int err;
38f7b870d Patrick McHardy 2007-06-13 2858
95a5afca4 Johannes Berg 2008-10-16 2859 #ifdef CONFIG_MODULES
38f7b870d Patrick McHardy 2007-06-13 2860 replay:
8072f085d Thomas Graf 2007-07-31 2861 #endif
c21ef3e34 David Ahern 2017-04-16 2862 err = nlmsg_parse(nlh,
sizeof(*ifm), tb, IFLA_MAX, ifla_policy, extack);
38f7b870d Patrick McHardy 2007-06-13 2863 if (err < 0)
38f7b870d Patrick McHardy 2007-06-13 2864 return err;
38f7b870d Patrick McHardy 2007-06-13 2865
4ff66cae7 Christian Brauner 2018-02-07 2866 err =
rtnl_ensure_unique_netns(tb, extack, false);
4ff66cae7 Christian Brauner 2018-02-07 2867 if (err < 0)
4ff66cae7 Christian Brauner 2018-02-07 2868 return err;
4ff66cae7 Christian Brauner 2018-02-07 2869
38f7b870d Patrick McHardy 2007-06-13 2870 if (tb[IFLA_IFNAME])
38f7b870d Patrick McHardy 2007-06-13 2871 nla_strlcpy(ifname,
tb[IFLA_IFNAME], IFNAMSIZ);
38f7b870d Patrick McHardy 2007-06-13 2872 else
38f7b870d Patrick McHardy 2007-06-13 2873 ifname[0] = '\0';
38f7b870d Patrick McHardy 2007-06-13 2874
38f7b870d Patrick McHardy 2007-06-13 2875 ifm = nlmsg_data(nlh);
38f7b870d Patrick McHardy 2007-06-13 2876 if (ifm->ifi_index > 0)
881d966b4 Eric W. Biederman 2007-09-17 2877 dev =
__dev_get_by_index(net, ifm->ifi_index);
e7ed828f1 Vlad Dogaru 2011-01-13 2878 else {
e7ed828f1 Vlad Dogaru 2011-01-13 2879 if (ifname[0])
881d966b4 Eric W. Biederman 2007-09-17 2880 dev =
__dev_get_by_name(net, ifname);
38f7b870d Patrick McHardy 2007-06-13 2881 else
38f7b870d Patrick McHardy 2007-06-13 2882 dev = NULL;
e7ed828f1 Vlad Dogaru 2011-01-13 2883 }
38f7b870d Patrick McHardy 2007-06-13 2884
ba7d49b1f Jiri Pirko 2014-01-22 2885 if (dev) {
ba7d49b1f Jiri Pirko 2014-01-22 2886 master_dev =
netdev_master_upper_dev_get(dev);
ba7d49b1f Jiri Pirko 2014-01-22 2887 if (master_dev)
ba7d49b1f Jiri Pirko 2014-01-22 2888 m_ops =
master_dev->rtnl_link_ops;
ba7d49b1f Jiri Pirko 2014-01-22 2889 }
ba7d49b1f Jiri Pirko 2014-01-22 2890
e0d087af7 Eric Dumazet 2009-11-07 2891 err = validate_linkmsg(dev, tb);
e0d087af7 Eric Dumazet 2009-11-07 2892 if (err < 0)
1840bb13c Thomas Graf 2008-02-23 2893 return err;
1840bb13c Thomas Graf 2008-02-23 2894
38f7b870d Patrick McHardy 2007-06-13 2895 if (tb[IFLA_LINKINFO]) {
38f7b870d Patrick McHardy 2007-06-13 2896 err =
nla_parse_nested(linkinfo, IFLA_INFO_MAX,
fceb6435e Johannes Berg 2017-04-12 2897
tb[IFLA_LINKINFO], ifla_info_policy,
fceb6435e Johannes Berg 2017-04-12 2898
NULL);
38f7b870d Patrick McHardy 2007-06-13 2899 if (err < 0)
38f7b870d Patrick McHardy 2007-06-13 2900 return err;
38f7b870d Patrick McHardy 2007-06-13 2901 } else
38f7b870d Patrick McHardy 2007-06-13 2902 memset(linkinfo, 0,
sizeof(linkinfo));
38f7b870d Patrick McHardy 2007-06-13 2903
38f7b870d Patrick McHardy 2007-06-13 2904 if (linkinfo[IFLA_INFO_KIND]) {
38f7b870d Patrick McHardy 2007-06-13 2905 nla_strlcpy(kind,
linkinfo[IFLA_INFO_KIND], sizeof(kind));
38f7b870d Patrick McHardy 2007-06-13 2906 ops =
rtnl_link_ops_get(kind);
38f7b870d Patrick McHardy 2007-06-13 2907 } else {
38f7b870d Patrick McHardy 2007-06-13 2908 kind[0] = '\0';
38f7b870d Patrick McHardy 2007-06-13 2909 ops = NULL;
38f7b870d Patrick McHardy 2007-06-13 2910 }
38f7b870d Patrick McHardy 2007-06-13 2911
38f7b870d Patrick McHardy 2007-06-13 2912 if (1) {
ccf8dbcd0 Kees Cook 2018-05-30 2913 struct nlattr
*attr[RTNL_MAX_TYPE + 1];
ccf8dbcd0 Kees Cook 2018-05-30 2914 struct nlattr
*slave_attr[RTNL_SLAVE_MAX_TYPE + 1];
ba7d49b1f Jiri Pirko 2014-01-22 2915 struct nlattr **data =
NULL;
ba7d49b1f Jiri Pirko 2014-01-22 2916 struct nlattr
**slave_data = NULL;
317f4810e Nicolas Dichtel 2015-01-15 2917 struct net *dest_net,
*link_net = NULL;
38f7b870d Patrick McHardy 2007-06-13 2918
38f7b870d Patrick McHardy 2007-06-13 2919 if (ops) {
ccf8dbcd0 Kees Cook 2018-05-30 2920 if
(ops->maxtype > RTNL_MAX_TYPE)
ccf8dbcd0 Kees Cook 2018-05-30 2921 return
-EINVAL;
ccf8dbcd0 Kees Cook 2018-05-30 2922
38f7b870d Patrick McHardy 2007-06-13 2923 if
(ops->maxtype && linkinfo[IFLA_INFO_DATA]) {
38f7b870d Patrick McHardy 2007-06-13 2924 err =
nla_parse_nested(attr, ops->maxtype,
38f7b870d Patrick McHardy 2007-06-13 2925
linkinfo[IFLA_INFO_DATA],
fceb6435e Johannes Berg 2017-04-12 2926
ops->policy, NULL);
38f7b870d Patrick McHardy 2007-06-13 2927 if (err
< 0)
38f7b870d Patrick McHardy 2007-06-13 2928
return err;
38f7b870d Patrick McHardy 2007-06-13 2929 data =
attr;
38f7b870d Patrick McHardy 2007-06-13 2930 }
38f7b870d Patrick McHardy 2007-06-13 2931 if
(ops->validate) {
a8b8a889e Matthias Schiffer 2017-06-25 2932 err =
ops->validate(tb, data, extack);
38f7b870d Patrick McHardy 2007-06-13 2933 if (err
< 0)
38f7b870d Patrick McHardy 2007-06-13 2934
return err;
38f7b870d Patrick McHardy 2007-06-13 2935 }
38f7b870d Patrick McHardy 2007-06-13 2936 }
38f7b870d Patrick McHardy 2007-06-13 2937
ba7d49b1f Jiri Pirko 2014-01-22 2938 if (m_ops) {
ccf8dbcd0 Kees Cook 2018-05-30 2939 if
(ops->slave_maxtype > RTNL_SLAVE_MAX_TYPE)
ccf8dbcd0 Kees Cook 2018-05-30 2940 return
-EINVAL;
ccf8dbcd0 Kees Cook 2018-05-30 2941
ba7d49b1f Jiri Pirko 2014-01-22 2942 if
(m_ops->slave_maxtype &&
ba7d49b1f Jiri Pirko 2014-01-22 2943
linkinfo[IFLA_INFO_SLAVE_DATA]) {
ba7d49b1f Jiri Pirko 2014-01-22 2944 err =
nla_parse_nested(slave_attr,
ba7d49b1f Jiri Pirko 2014-01-22 2945
m_ops->slave_maxtype,
ba7d49b1f Jiri Pirko 2014-01-22 2946
linkinfo[IFLA_INFO_SLAVE_DATA],
fceb6435e Johannes Berg 2017-04-12 2947
m_ops->slave_policy,
fceb6435e Johannes Berg 2017-04-12 2948
NULL);
ba7d49b1f Jiri Pirko 2014-01-22 2949 if (err
< 0)
ba7d49b1f Jiri Pirko 2014-01-22 2950
return err;
ba7d49b1f Jiri Pirko 2014-01-22 2951
slave_data = slave_attr;
ba7d49b1f Jiri Pirko 2014-01-22 2952 }
ba7d49b1f Jiri Pirko 2014-01-22 2953 }
ba7d49b1f Jiri Pirko 2014-01-22 2954
38f7b870d Patrick McHardy 2007-06-13 2955 if (dev) {
90c325e3b Nicolas Dichtel 2014-09-01 2956 int status = 0;
38f7b870d Patrick McHardy 2007-06-13 2957
38f7b870d Patrick McHardy 2007-06-13 2958 if
(nlh->nlmsg_flags & NLM_F_EXCL)
38f7b870d Patrick McHardy 2007-06-13 2959 return
-EEXIST;
38f7b870d Patrick McHardy 2007-06-13 2960 if
(nlh->nlmsg_flags & NLM_F_REPLACE)
38f7b870d Patrick McHardy 2007-06-13 2961 return
-EOPNOTSUPP;
38f7b870d Patrick McHardy 2007-06-13 2962
38f7b870d Patrick McHardy 2007-06-13 2963 if
(linkinfo[IFLA_INFO_DATA]) {
38f7b870d Patrick McHardy 2007-06-13 2964 if
(!ops || ops != dev->rtnl_link_ops ||
38f7b870d Patrick McHardy 2007-06-13 2965
!ops->changelink)
38f7b870d Patrick McHardy 2007-06-13 2966
return -EOPNOTSUPP;
38f7b870d Patrick McHardy 2007-06-13 2967
ad744b223 Matthias Schiffer 2017-06-25 2968 err =
ops->changelink(dev, tb, data, extack);
38f7b870d Patrick McHardy 2007-06-13 2969 if (err
< 0)
38f7b870d Patrick McHardy 2007-06-13 2970
return err;
ba9989069 Nicolas Dichtel 2014-09-01 2971 status
|= DO_SETLINK_NOTIFY;
38f7b870d Patrick McHardy 2007-06-13 2972 }
38f7b870d Patrick McHardy 2007-06-13 2973
ba7d49b1f Jiri Pirko 2014-01-22 2974 if
(linkinfo[IFLA_INFO_SLAVE_DATA]) {
ba7d49b1f Jiri Pirko 2014-01-22 2975 if
(!m_ops || !m_ops->slave_changelink)
ba7d49b1f Jiri Pirko 2014-01-22 2976
return -EOPNOTSUPP;
ba7d49b1f Jiri Pirko 2014-01-22 2977
ba7d49b1f Jiri Pirko 2014-01-22 2978 err =
m_ops->slave_changelink(master_dev, dev,
17dd0ec47 Matthias Schiffer 2017-06-25 2979
tb, slave_data,
17dd0ec47 Matthias Schiffer 2017-06-25 2980
extack);
ba7d49b1f Jiri Pirko 2014-01-22 2981 if (err
< 0)
ba7d49b1f Jiri Pirko 2014-01-22 2982
return err;
ba9989069 Nicolas Dichtel 2014-09-01 2983 status
|= DO_SETLINK_NOTIFY;
ba7d49b1f Jiri Pirko 2014-01-22 2984 }
ba7d49b1f Jiri Pirko 2014-01-22 2985
ddf9f9707 Jakub Kicinski 2017-04-30 2986 return
do_setlink(skb, dev, ifm, extack, tb, ifname,
ddf9f9707 Jakub Kicinski 2017-04-30 2987
status);
38f7b870d Patrick McHardy 2007-06-13 2988 }
38f7b870d Patrick McHardy 2007-06-13 2989
ffa934f19 Patrick McHardy 2011-01-20 2990 if (!(nlh->nlmsg_flags
& NLM_F_CREATE)) {
ffa934f19 Patrick McHardy 2011-01-20 2991 if
(ifm->ifi_index == 0 && tb[IFLA_GROUP])
90f62cf30 Eric W. Biederman 2014-04-23 2992 return
rtnl_group_changelink(skb, net,
ffa934f19 Patrick McHardy 2011-01-20 2993
nla_get_u32(tb[IFLA_GROUP]),
ddf9f9707 Jakub Kicinski 2017-04-30 2994
ifm, extack, tb);
38f7b870d Patrick McHardy 2007-06-13 2995 return -ENODEV;
ffa934f19 Patrick McHardy 2011-01-20 2996 }
38f7b870d Patrick McHardy 2007-06-13 2997
160ca0142 Theuns Verwoerd 2017-01-31 2998 if (tb[IFLA_MAP] ||
tb[IFLA_PROTINFO])
38f7b870d Patrick McHardy 2007-06-13 2999 return
-EOPNOTSUPP;
38f7b870d Patrick McHardy 2007-06-13 3000
38f7b870d Patrick McHardy 2007-06-13 3001 if (!ops) {
95a5afca4 Johannes Berg 2008-10-16 3002 #ifdef CONFIG_MODULES
38f7b870d Patrick McHardy 2007-06-13 3003 if (kind[0]) {
38f7b870d Patrick McHardy 2007-06-13 3004
__rtnl_unlock();
38f7b870d Patrick McHardy 2007-06-13 3005
request_module("rtnl-link-%s", kind);
38f7b870d Patrick McHardy 2007-06-13 3006
rtnl_lock();
38f7b870d Patrick McHardy 2007-06-13 3007 ops =
rtnl_link_ops_get(kind);
38f7b870d Patrick McHardy 2007-06-13 3008 if (ops)
38f7b870d Patrick McHardy 2007-06-13 3009
goto replay;
38f7b870d Patrick McHardy 2007-06-13 3010 }
38f7b870d Patrick McHardy 2007-06-13 3011 #endif
38f7b870d Patrick McHardy 2007-06-13 3012 return
-EOPNOTSUPP;
38f7b870d Patrick McHardy 2007-06-13 3013 }
38f7b870d Patrick McHardy 2007-06-13 3014
b0ab2fabb Jiri Pirko 2014-06-26 3015 if (!ops->setup)
b0ab2fabb Jiri Pirko 2014-06-26 3016 return
-EOPNOTSUPP;
b0ab2fabb Jiri Pirko 2014-06-26 3017
5517750f0 Tom Gundersen 2014-07-14 3018 if (!ifname[0]) {
38f7b870d Patrick McHardy 2007-06-13 3019
snprintf(ifname, IFNAMSIZ, "%s%%d", ops->kind);
5517750f0 Tom Gundersen 2014-07-14 3020
name_assign_type = NET_NAME_ENUM;
5517750f0 Tom Gundersen 2014-07-14 3021 }
38f7b870d Patrick McHardy 2007-06-13 3022
5bb8ed075 Christian Brauner 2018-01-29 3023 dest_net =
rtnl_link_get_net_capable(skb, net, tb, CAP_NET_ADMIN);
13ad17745 Eric W. Biederman 2011-01-29 3024 if (IS_ERR(dest_net))
13ad17745 Eric W. Biederman 2011-01-29 3025 return
PTR_ERR(dest_net);
13ad17745 Eric W. Biederman 2011-01-29 3026
317f4810e Nicolas Dichtel 2015-01-15 3027 if
(tb[IFLA_LINK_NETNSID]) {
317f4810e Nicolas Dichtel 2015-01-15 3028 int id =
nla_get_s32(tb[IFLA_LINK_NETNSID]);
317f4810e Nicolas Dichtel 2015-01-15 3029
317f4810e Nicolas Dichtel 2015-01-15 3030 link_net =
get_net_ns_by_id(dest_net, id);
317f4810e Nicolas Dichtel 2015-01-15 3031 if (!link_net) {
317f4810e Nicolas Dichtel 2015-01-15 3032 err =
-EINVAL;
317f4810e Nicolas Dichtel 2015-01-15 3033 goto
out;
317f4810e Nicolas Dichtel 2015-01-15 3034 }
06615bed6 Eric W. Biederman 2015-02-26 3035 err = -EPERM;
06615bed6 Eric W. Biederman 2015-02-26 3036 if
(!netlink_ns_capable(skb, link_net->user_ns, CAP_NET_ADMIN))
06615bed6 Eric W. Biederman 2015-02-26 3037 goto
out;
317f4810e Nicolas Dichtel 2015-01-15 3038 }
317f4810e Nicolas Dichtel 2015-01-15 3039
317f4810e Nicolas Dichtel 2015-01-15 3040 dev =
rtnl_create_link(link_net ? : dest_net, ifname,
317f4810e Nicolas Dichtel 2015-01-15 3041
name_assign_type, ops, tb);
9c7dafbfa Pavel Emelyanov 2012-08-08 3042 if (IS_ERR(dev)) {
e71992889 Pavel Emelianov 2007-08-08 3043 err =
PTR_ERR(dev);
9c7dafbfa Pavel Emelyanov 2012-08-08 3044 goto out;
9c7dafbfa Pavel Emelyanov 2012-08-08 3045 }
9c7dafbfa Pavel Emelyanov 2012-08-08 3046
9c7dafbfa Pavel Emelyanov 2012-08-08 3047 dev->ifindex =
ifm->ifi_index;
9c7dafbfa Pavel Emelyanov 2012-08-08 3048
0e0eee246 Cong Wang 2014-02-11 3049 if (ops->newlink) {
7a3f4a185 Matthias Schiffer 2017-06-25 3050 err =
ops->newlink(link_net ? : net, dev, tb, data,
7a3f4a185 Matthias Schiffer 2017-06-25 3051
extack);
0e0eee246 Cong Wang 2014-02-11 3052 /* Drivers
should call free_netdev() in ->destructor
e51fb1523 Cong Wang 2014-06-03 3053 * and
unregister it on failure after registration
e51fb1523 Cong Wang 2014-06-03 3054 * so that
device could be finally freed in rtnl_unlock.
0e0eee246 Cong Wang 2014-02-11 3055 */
e51fb1523 Cong Wang 2014-06-03 3056 if (err < 0) {
e51fb1523 Cong Wang 2014-06-03 3057 /* If
device is not registered at all, free it now */
e51fb1523 Cong Wang 2014-06-03 3058 if
(dev->reg_state == NETREG_UNINITIALIZED)
e51fb1523 Cong Wang 2014-06-03 3059
free_netdev(dev);
0e0eee246 Cong Wang 2014-02-11 3060 goto
out;
e51fb1523 Cong Wang 2014-06-03 3061 }
0e0eee246 Cong Wang 2014-02-11 3062 } else {
2d85cba2b Patrick McHardy 2007-07-11 3063 err =
register_netdevice(dev);
fce9b9be8 Dan Carpenter 2013-08-14 3064 if (err < 0) {
38f7b870d Patrick McHardy 2007-06-13 3065
free_netdev(dev);
3729d5021 Patrick McHardy 2010-02-26 3066 goto
out;
fce9b9be8 Dan Carpenter 2013-08-14 3067 }
0e0eee246 Cong Wang 2014-02-11 3068 }
3729d5021 Patrick McHardy 2010-02-26 3069 err =
rtnl_configure_link(dev, ifm);
436389007 David S. Miller 2015-03-10 3070 if (err < 0)
436389007 David S. Miller 2015-03-10 3071 goto
out_unregister;
bdef279b9 Nicolas Dichtel 2015-01-20 3072 if (link_net) {
317f4810e Nicolas Dichtel 2015-01-15 3073 err =
dev_change_net_namespace(dev, dest_net, ifname);
bdef279b9 Nicolas Dichtel 2015-01-20 3074 if (err < 0)
436389007 David S. Miller 2015-03-10 3075 goto
out_unregister;
bdef279b9 Nicolas Dichtel 2015-01-20 3076 }
160ca0142 Theuns Verwoerd 2017-01-31 3077 if (tb[IFLA_MASTER]) {
33eaf2a6e David Ahern 2017-10-04 3078 err =
do_set_master(dev, nla_get_u32(tb[IFLA_MASTER]),
33eaf2a6e David Ahern 2017-10-04 3079
extack);
160ca0142 Theuns Verwoerd 2017-01-31 3080 if (err)
160ca0142 Theuns Verwoerd 2017-01-31 3081 goto
out_unregister;
160ca0142 Theuns Verwoerd 2017-01-31 3082 }
3729d5021 Patrick McHardy 2010-02-26 3083 out:
317f4810e Nicolas Dichtel 2015-01-15 3084 if (link_net)
317f4810e Nicolas Dichtel 2015-01-15 3085
put_net(link_net);
81adee47d Eric W. Biederman 2009-11-08 3086 put_net(dest_net);
38f7b870d Patrick McHardy 2007-06-13 3087 return err;
436389007 David S. Miller 2015-03-10 3088 out_unregister:
436389007 David S. Miller 2015-03-10 3089 if (ops->newlink) {
436389007 David S. Miller 2015-03-10 3090
LIST_HEAD(list_kill);
436389007 David S. Miller 2015-03-10 3091
436389007 David S. Miller 2015-03-10 3092
ops->dellink(dev, &list_kill);
436389007 David S. Miller 2015-03-10 3093
unregister_netdevice_many(&list_kill);
436389007 David S. Miller 2015-03-10 3094 } else {
436389007 David S. Miller 2015-03-10 3095
unregister_netdevice(dev);
436389007 David S. Miller 2015-03-10 3096 }
436389007 David S. Miller 2015-03-10 3097 goto out;
38f7b870d Patrick McHardy 2007-06-13 3098 }
38f7b870d Patrick McHardy 2007-06-13 @3099 }
38f7b870d Patrick McHardy 2007-06-13 3100
:::::: The code at line 3099 was first introduced by commit
:::::: 38f7b870d4a6a5d3ec21557e849620cb7d032965 [RTNETLINK]: Link creation API
:::::: TO: Patrick McHardy <ka...@trash.net>
:::::: CC: David S. Miller <da...@sunset.davemloft.net>
---
0-DAY kernel test infrastructure Open Source Technology Center
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