vxlan: Annotate FDB data races

The 'used' and 'updated' fields in the FDB entry structure can be
accessed concurrently by multiple threads, leading to reports such as
[1]. Can be reproduced using [2].

Suppress these reports by annotating these accesses using
READ_ONCE() / WRITE_ONCE().

[1]
BUG: KCSAN: data-race in vxlan_xmit / vxlan_xmit

write to 0xffff942604d263a8 of 8 bytes by task 286 on cpu 0:
 vxlan_xmit+0xb29/0x2380
 dev_hard_start_xmit+0x84/0x2f0
 __dev_queue_xmit+0x45a/0x1650
 packet_xmit+0x100/0x150
 packet_sendmsg+0x2114/0x2ac0
 __sys_sendto+0x318/0x330
 __x64_sys_sendto+0x76/0x90
 x64_sys_call+0x14e8/0x1c00
 do_syscall_64+0x9e/0x1a0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffff942604d263a8 of 8 bytes by task 287 on cpu 2:
 vxlan_xmit+0xadf/0x2380
 dev_hard_start_xmit+0x84/0x2f0
 __dev_queue_xmit+0x45a/0x1650
 packet_xmit+0x100/0x150
 packet_sendmsg+0x2114/0x2ac0
 __sys_sendto+0x318/0x330
 __x64_sys_sendto+0x76/0x90
 x64_sys_call+0x14e8/0x1c00
 do_syscall_64+0x9e/0x1a0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x00000000fffbac6e -> 0x00000000fffbac6f

Reported by Kernel Concurrency Sanitizer on:
CPU: 2 UID: 0 PID: 287 Comm: mausezahn Not tainted 6.13.0-rc7-01544-gb4b270f11a02 #5
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.3-3.fc41 04/01/2014

[2]
 #!/bin/bash

 set +H
 echo whitelist > /sys/kernel/debug/kcsan
 echo !vxlan_xmit > /sys/kernel/debug/kcsan

 ip link add name vx0 up type vxlan id 10010 dstport 4789 local 192.0.2.1
 bridge fdb add 00:11:22:33:44:55 dev vx0 self static dst 198.51.100.1
 taskset -c 0 mausezahn vx0 -a own -b 00:11:22:33:44:55 -c 0 -q &
 taskset -c 2 mausezahn vx0 -a own -b 00:11:22:33:44:55 -c 0 -q &

Reviewed-by: Petr Machata <petrm@nvidia.com>
Signed-off-by: Ido Schimmel <idosch@nvidia.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: Nikolay Aleksandrov <razor@blackwall.org>
Link: https://patch.msgid.link/20250204145549.1216254-2-idosch@nvidia.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

diff --git a/drivers/net/vxlan/vxlan_core.c b/drivers/net/vxlan/vxlan_core.c
index 05c10acb2a57edef3d012b49fe9b964c6c3e818d..2f2c6606f719153126c3381ac1dec9a714c5a40e 100644 (file)
--- a/drivers/net/vxlan/vxlan_core.c
+++ b/drivers/net/vxlan/vxlan_core.c
@@ -227,9 +227,9 @@ static int vxlan_fdb_info(struct sk_buff *skb, struct vxlan_dev *vxlan,
                        be32_to_cpu(fdb->vni)))
                goto nla_put_failure;
 
-       ci.ndm_used      = jiffies_to_clock_t(now - fdb->used);
+       ci.ndm_used      = jiffies_to_clock_t(now - READ_ONCE(fdb->used));
        ci.ndm_confirmed = 0;
-       ci.ndm_updated   = jiffies_to_clock_t(now - fdb->updated);
+       ci.ndm_updated   = jiffies_to_clock_t(now - READ_ONCE(fdb->updated));
        ci.ndm_refcnt    = 0;
 
        if (nla_put(skb, NDA_CACHEINFO, sizeof(ci), &ci))
@@ -434,8 +434,8 @@ static struct vxlan_fdb *vxlan_find_mac(struct vxlan_dev *vxlan,
        struct vxlan_fdb *f;
 
        f = __vxlan_find_mac(vxlan, mac, vni);
-       if (f && f->used != jiffies)
-               f->used = jiffies;
+       if (f && READ_ONCE(f->used) != jiffies)
+               WRITE_ONCE(f->used, jiffies);
 
        return f;
 }
@@ -1009,12 +1009,12 @@ static int vxlan_fdb_update_existing(struct vxlan_dev *vxlan,
            !(f->flags & NTF_VXLAN_ADDED_BY_USER)) {
                if (f->state != state) {
                        f->state = state;
-                       f->updated = jiffies;
+                       WRITE_ONCE(f->updated, jiffies);
                        notify = 1;
                }
                if (f->flags != fdb_flags) {
                        f->flags = fdb_flags;
-                       f->updated = jiffies;
+                       WRITE_ONCE(f->updated, jiffies);
                        notify = 1;
                }
        }
@@ -1048,7 +1048,7 @@ static int vxlan_fdb_update_existing(struct vxlan_dev *vxlan,
        }
 
        if (ndm_flags & NTF_USE)
-               f->used = jiffies;
+               WRITE_ONCE(f->used, jiffies);
 
        if (notify) {
                if (rd == NULL)
@@ -1481,7 +1481,7 @@ static enum skb_drop_reason vxlan_snoop(struct net_device *dev,
                                    src_mac, &rdst->remote_ip.sa, &src_ip->sa);
 
                rdst->remote_ip = *src_ip;
-               f->updated = jiffies;
+               WRITE_ONCE(f->updated, jiffies);
                vxlan_fdb_notify(vxlan, f, rdst, RTM_NEWNEIGH, true, NULL);
        } else {
                u32 hash_index = fdb_head_index(vxlan, src_mac, vni);
@@ -2852,7 +2852,7 @@ static void vxlan_cleanup(struct timer_list *t)
                        if (f->flags & NTF_EXT_LEARNED)
                                continue;
 
-                       timeout = f->used + vxlan->cfg.age_interval * HZ;
+                       timeout = READ_ONCE(f->used) + vxlan->cfg.age_interval * HZ;
                        if (time_before_eq(timeout, jiffies)) {
                                netdev_dbg(vxlan->dev,
                                           "garbage collect %pM\n",