| created | 2022-02-21T09:56:34Z |
|---|---|
| begin | 2022-02-16T01:45:31Z |
| end | 2022-02-16T02:22:39Z |
| path | src/sys |
| commits | 1 |
| date | 2022-02-16T02:22:39Z | |||
|---|---|---|---|---|
| author | dlg | |||
| files | src/sys/net/if_tun.c | log | diff | annotate |
| message |
prevent (re)opening of tun/tap interfaces that are being destroyed. if an open tun (or tap) device is destroyed via the clone destroy ioctl (eg, like what ifconfig destroy does), there is a window while the open device is being revoked on the vfs side that a third thread can come and open it again. this in turn triggers a kassert in the ifconfig destroy path where it expects the device to be closed. fix this by having tun_dev_open check for the TUN_DEAD flag that the destroy function sets. this still relies on the kernel lock for serialisation. Reported-by: [email protected] ok visa@ |
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