net: race condition in ipv6 forwarding and disable_ipv6 parameters
There is a race condition in addrconf_sysctl_forward() and addrconf_sysctl_disable(). These functions change idev->cnf.forwarding (resp. idev->cnf.disable_ipv6) and then try to grab the rtnl lock before performing any actions. If that fails they restore the original value and restart the syscall. This creates race conditions if ipv6 code tries to access these parameters, or if multiple instances try to do the same operation. As an example of the former, if __ipv6_ifa_notify() finds a 0 in idev->cnf.forwarding when invoked by addrconf_ifdown() it may not free anycast addresses, ultimately resulting in the net_device not being freed. This patch reads the user parameters into a temporary location and only writes the actual parameters when the rtnl lock is acquired. Tested in 2.6.38.8. Signed-off-by: NFrancesco Ruggeri <fruggeri@aristanetworks.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
Showing
想要评论请 注册 或 登录