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If ipv6 has been disabled from cmdline since kernel started, it makes no sense to allow users to create any ip6 tunnel. Otherwise, it could some potential problem. Jianlin found a kernel crash caused by this in ip6_gre when he set ipv6.disable=1 in grub: [ 209.588865] Unable to handle kernel paging request for data at address 0x00000080 [ 209.588872] Faulting instruction address: 0xc000000000a3aa6c [ 209.588879] Oops: Kernel access of bad area, sig: 11 [#1] [ 209.589062] NIP [c000000000a3aa6c] fib_rules_lookup+0x4c/0x260 [ 209.589071] LR [c000000000b9ad90] fib6_rule_lookup+0x50/0xb0 [ 209.589076] Call Trace: [ 209.589097] fib6_rule_lookup+0x50/0xb0 [ 209.589106] rt6_lookup+0xc4/0x110 [ 209.589116] ip6gre_tnl_link_config+0x214/0x2f0 [ip6_gre] [ 209.589125] ip6gre_newlink+0x138/0x3a0 [ip6_gre] [ 209.589134] rtnl_newlink+0x798/0xb80 [ 209.589142] rtnetlink_rcv_msg+0xec/0x390 [ 209.589151] netlink_rcv_skb+0x138/0x150 [ 209.589159] rtnetlink_rcv+0x48/0x70 [ 209.589169] netlink_unicast+0x538/0x640 [ 209.589175] netlink_sendmsg+0x40c/0x480 [ 209.589184] ___sys_sendmsg+0x384/0x4e0 [ 209.589194] SyS_sendmsg+0xd4/0x140 [ 209.589201] SyS_socketcall+0x3e0/0x4f0 [ 209.589209] system_call+0x38/0xe0 This patch is to return -EOPNOTSUPP in ip6_tunnel_init if ipv6 has been disabled from cmdline. Reported-by: Jianlin Shi <jishi@redhat.com> Signed-off-by: Xin Long <lucien.xin@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net> |
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Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. Please read the Documentation/process/changes.rst file, as it contains the requirements for building and running the kernel, and information about the problems which may result by upgrading your kernel.