| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Message-Id: <168595558535.1618839.4634246126873842766.stgit@ebuild>
Date: Mon, 5 Jun 2023 10:59:50 +0200
From: Eelco Chaudron <echaudro@...hat.com>
To: netdev@...r.kernel.org
Cc: pshelar@....org,
davem@...emloft.net,
edumazet@...gle.com,
kuba@...nel.org,
pabeni@...hat.com,
dev@...nvswitch.org,
aconole@...hat.com
Subject: [PATCH net] net: openvswitch: fix upcall counter access before allocation
Currently, the per cpu upcall counters are allocated after the vport is
created and inserted into the system. This could lead to the datapath
accessing the counters before they are allocated resulting in a kernel
Oops.
Here is an example:
PID: 59693 TASK: ffff0005f4f51500 CPU: 0 COMMAND: "ovs-vswitchd"
#0 [ffff80000a39b5b0] __switch_to at ffffb70f0629f2f4
#1 [ffff80000a39b5d0] __schedule at ffffb70f0629f5cc
#2 [ffff80000a39b650] preempt_schedule_common at ffffb70f0629fa60
#3 [ffff80000a39b670] dynamic_might_resched at ffffb70f0629fb58
#4 [ffff80000a39b680] mutex_lock_killable at ffffb70f062a1388
#5 [ffff80000a39b6a0] pcpu_alloc at ffffb70f0594460c
#6 [ffff80000a39b750] __alloc_percpu_gfp at ffffb70f05944e68
#7 [ffff80000a39b760] ovs_vport_cmd_new at ffffb70ee6961b90 [openvswitch]
...
PID: 58682 TASK: ffff0005b2f0bf00 CPU: 0 COMMAND: "kworker/0:3"
#0 [ffff80000a5d2f40] machine_kexec at ffffb70f056a0758
#1 [ffff80000a5d2f70] __crash_kexec at ffffb70f057e2994
#2 [ffff80000a5d3100] crash_kexec at ffffb70f057e2ad8
#3 [ffff80000a5d3120] die at ffffb70f0628234c
#4 [ffff80000a5d31e0] die_kernel_fault at ffffb70f062828a8
#5 [ffff80000a5d3210] __do_kernel_fault at ffffb70f056a31f4
#6 [ffff80000a5d3240] do_bad_area at ffffb70f056a32a4
#7 [ffff80000a5d3260] do_translation_fault at ffffb70f062a9710
#8 [ffff80000a5d3270] do_mem_abort at ffffb70f056a2f74
#9 [ffff80000a5d32a0] el1_abort at ffffb70f06297dac
#10 [ffff80000a5d32d0] el1h_64_sync_handler at ffffb70f06299b24
#11 [ffff80000a5d3410] el1h_64_sync at ffffb70f056812dc
#12 [ffff80000a5d3430] ovs_dp_upcall at ffffb70ee6963c84 [openvswitch]
#13 [ffff80000a5d3470] ovs_dp_process_packet at ffffb70ee6963fdc [openvswitch]
#14 [ffff80000a5d34f0] ovs_vport_receive at ffffb70ee6972c78 [openvswitch]
#15 [ffff80000a5d36f0] netdev_port_receive at ffffb70ee6973948 [openvswitch]
#16 [ffff80000a5d3720] netdev_frame_hook at ffffb70ee6973a28 [openvswitch]
#17 [ffff80000a5d3730] __netif_receive_skb_core.constprop.0 at ffffb70f06079f90
We moved the per cpu upcall counter allocation to the existing vport
alloc and free functions to solve this.
Fixes: 95637d91fefd ("net: openvswitch: release vport resources on failure")
Fixes: 1933ea365aa7 ("net: openvswitch: Add support to count upcall packets")
Signed-off-by: Eelco Chaudron <echaudro@...hat.com>
---
net/openvswitch/datapath.c | 19 -------------------
net/openvswitch/vport.c | 8 ++++++++
2 files changed, 8 insertions(+), 19 deletions(-)
diff --git a/net/openvswitch/datapath.c b/net/openvswitch/datapath.c
index fcee6012293b..58f530f60172 100644
--- a/net/openvswitch/datapath.c
+++ b/net/openvswitch/datapath.c
@@ -236,9 +236,6 @@ void ovs_dp_detach_port(struct vport *p)
/* First drop references to device. */
hlist_del_rcu(&p->dp_hash_node);
- /* Free percpu memory */
- free_percpu(p->upcall_stats);
-
/* Then destroy it. */
ovs_vport_del(p);
}
@@ -1858,12 +1855,6 @@ static int ovs_dp_cmd_new(struct sk_buff *skb, struct genl_info *info)
goto err_destroy_portids;
}
- vport->upcall_stats = netdev_alloc_pcpu_stats(struct vport_upcall_stats_percpu);
- if (!vport->upcall_stats) {
- err = -ENOMEM;
- goto err_destroy_vport;
- }
-
err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
info->snd_seq, 0, OVS_DP_CMD_NEW);
BUG_ON(err < 0);
@@ -1876,8 +1867,6 @@ static int ovs_dp_cmd_new(struct sk_buff *skb, struct genl_info *info)
ovs_notify(&dp_datapath_genl_family, reply, info);
return 0;
-err_destroy_vport:
- ovs_dp_detach_port(vport);
err_destroy_portids:
kfree(rcu_dereference_raw(dp->upcall_portids));
err_unlock_and_destroy_meters:
@@ -2322,12 +2311,6 @@ static int ovs_vport_cmd_new(struct sk_buff *skb, struct genl_info *info)
goto exit_unlock_free;
}
- vport->upcall_stats = netdev_alloc_pcpu_stats(struct vport_upcall_stats_percpu);
- if (!vport->upcall_stats) {
- err = -ENOMEM;
- goto exit_unlock_free_vport;
- }
-
err = ovs_vport_cmd_fill_info(vport, reply, genl_info_net(info),
info->snd_portid, info->snd_seq, 0,
OVS_VPORT_CMD_NEW, GFP_KERNEL);
@@ -2345,8 +2328,6 @@ static int ovs_vport_cmd_new(struct sk_buff *skb, struct genl_info *info)
ovs_notify(&dp_vport_genl_family, reply, info);
return 0;
-exit_unlock_free_vport:
- ovs_dp_detach_port(vport);
exit_unlock_free:
ovs_unlock();
kfree_skb(reply);
diff --git a/net/openvswitch/vport.c b/net/openvswitch/vport.c
index 7e0f5c45b512..e91ae5dd7d22 100644
--- a/net/openvswitch/vport.c
+++ b/net/openvswitch/vport.c
@@ -135,12 +135,19 @@ struct vport *ovs_vport_alloc(int priv_size, const struct vport_ops *ops,
if (!vport)
return ERR_PTR(-ENOMEM);
+ vport->upcall_stats = netdev_alloc_pcpu_stats(struct vport_upcall_stats_percpu);
+ if (!vport->upcall_stats) {
+ kfree(vport);
+ return ERR_PTR(-ENOMEM);
+ }
+
vport->dp = parms->dp;
vport->port_no = parms->port_no;
vport->ops = ops;
INIT_HLIST_NODE(&vport->dp_hash_node);
if (ovs_vport_set_upcall_portids(vport, parms->upcall_portids)) {
+ free_percpu(vport->upcall_stats);
kfree(vport);
return ERR_PTR(-EINVAL);
}
@@ -165,6 +172,7 @@ void ovs_vport_free(struct vport *vport)
* it is safe to use raw dereference.
*/
kfree(rcu_dereference_raw(vport->upcall_portids));
+ free_percpu(vport->upcall_stats);
kfree(vport);
}
EXPORT_SYMBOL_GPL(ovs_vport_free);
Powered by blists - more mailing lists