[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] [PATCH] libxl: set permissions for xs frontend entry pointing to xs backend
On 10/09/13 17:02, Ian Campbell wrote: > On Tue, 2013-09-10 at 16:54 +0200, Roger Pau Monne wrote: >> libxl doesn't currently set the permissions of entries like: >> >> /local/domain/<domid>/device/<dev_type>/<devid>/backend >> >> This allows the guest to change this xenstore entries to point to a >> different backend path, or to malicious xenstore path forged by the >> guest itself. libxl currently relies on this path being valid in order >> to perform the unplug of devices in libxl__devices_destroy, so we >> should prevent the guest from modifying this xenstore entry. >> >> This patch sets the permisions of said path to be the same as a >> backend xenstore entry (owned by the toolstack domain, readable by the >> guest). > > and just to confirm: despite having r/w access to the containing > directory, the guest cannot remove this node and recreate it? No, it can't (I've tried it): root@debian:~# xenstore-rm /local/domain/54/device/vbd/51712/backend xenstore-rm: could not remove path /local/domain/54/device/vbd/51712/backend _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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