[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] [PATCH v4 net] xen-netback: disable rogue vif in kthread context
From: Wei Liu <wei.liu2@xxxxxxxxxx> Date: Tue, 1 Apr 2014 12:46:12 +0100 > When netback discovers frontend is sending malformed packet it will > disables the interface which serves that frontend. > > However disabling a network interface involving taking a mutex which > cannot be done in softirq context, so we need to defer this process to > kthread context. > > This patch does the following: > 1. introduce a flag to indicate the interface is disabled. > 2. check that flag in TX path, don't do any work if it's true. > 3. check that flag in RX path, turn off that interface if it's true. > > The reason to disable it in RX path is because RX uses kthread. After > this change the behavior of netback is still consistent -- it won't do > any TX work for a rogue frontend, and the interface will be eventually > turned off. > > Also change a "continue" to "break" after xenvif_fatal_tx_err, as it > doesn't make sense to continue processing packets if frontend is rogue. > > This is a fix for XSA-90. > > Reported-by: Török Edwin <edwin@xxxxxxxxxx> > Signed-off-by: Wei Liu <wei.liu2@xxxxxxxxxx> Applied. _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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