Recently an oops was reported in phonet if there was a failure during network namespace creation. [ 163.733755] ------------[ cut here ]------------ [ 163.734501] kernel BUG at include/net/netns/generic.h:45! [ 163.734501] invalid opcode: 0000 [#1] PREEMPT SMP [ 163.734501] CPU 2 [ 163.734501] Pid: 19145, comm: trinity Tainted: G W 3.4.0-rc1-next-20120405-sasha-dirty #57 [ 163.734501] RIP: 0010:[<ffffffff824d6062>] [<ffffffff824d6062>] phonet_pernet+0x182/0x1a0 [ 163.734501] RSP: 0018:ffff8800674d5ca8 EFLAGS: 00010246 [ 163.734501] RAX: 000000003fffffff RBX: 0000000000000000 RCX: ffff8800678c88d8 [ 163.734501] RDX: 00000000003f4000 RSI: ffff8800678c8910 RDI: 0000000000000282 [ 163.734501] RBP: ffff8800674d5cc8 R08: 0000000000000000 R09: 0000000000000000 [ 163.734501] R10: 0000000000000000 R11: 0000000000000000 R12: ffff880068bec920 [ 163.734501] R13: ffffffff836b90c0 R14: 0000000000000000 R15: 0000000000000000 [ 163.734501] FS: 00007f055e8de700(0000) GS:ffff88007d000000(0000) knlGS:0000000000000000 [ 163.734501] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b [ 163.734501] CR2: 00007f055e6bb518 CR3: 0000000070c16000 CR4: 00000000000406e0 [ 163.734501] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 163.734501] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 [ 163.734501] Process trinity (pid: 19145, threadinfo ffff8800674d4000, task ffff8800678c8000) [ 163.734501] Stack: [ 163.734501] ffffffff824d5f00 ffffffff810e2ec1 ffff880067ae0000 00000000ffffffd4 [ 163.734501] ffff8800674d5cf8 ffffffff824d667a ffff880067ae0000 00000000ffffffd4 [ 163.734501] ffffffff836b90c0 0000000000000000 ffff8800674d5d18 ffffffff824d707d [ 163.734501] Call Trace: [ 163.734501] [<ffffffff824d5f00>] ? phonet_pernet+0x20/0x1a0 [ 163.734501] [<ffffffff810e2ec1>] ? get_parent_ip+0x11/0x50 [ 163.734501] [<ffffffff824d667a>] phonet_device_destroy+0x1a/0x100 [ 163.734501] [<ffffffff824d707d>] phonet_device_notify+0x3d/0x50 [ 163.734501] [<ffffffff810dd96e>] notifier_call_chain+0xee/0x130 [ 163.734501] [<ffffffff810dd9d1>] raw_notifier_call_chain+0x11/0x20 [ 163.734501] [<ffffffff821cce12>] call_netdevice_notifiers+0x52/0x60 [ 163.734501] [<ffffffff821cd235>] rollback_registered_many+0x185/0x270 [ 163.734501] [<ffffffff821cd334>] unregister_netdevice_many+0x14/0x60 [ 163.734501] [<ffffffff823123e3>] ipip_exit_net+0x1b3/0x1d0 [ 163.734501] [<ffffffff82312230>] ? ipip_rcv+0x420/0x420 [ 163.734501] [<ffffffff821c8515>] ops_exit_list+0x35/0x70 [ 163.734501] [<ffffffff821c911b>] setup_net+0xab/0xe0 [ 163.734501] [<ffffffff821c9416>] copy_net_ns+0x76/0x100 [ 163.734501] [<ffffffff810dc92b>] create_new_namespaces+0xfb/0x190 [ 163.734501] [<ffffffff810dca21>] unshare_nsproxy_namespaces+0x61/0x80 [ 163.734501] [<ffffffff810afd1f>] sys_unshare+0xff/0x290 [ 163.734501] [<ffffffff8187622e>] ? trace_hardirqs_on_thunk+0x3a/0x3f [ 163.734501] [<ffffffff82665539>] system_call_fastpath+0x16/0x1b [ 163.734501] Code: e0 c3 fe 66 0f 1f 44 00 00 48 c7 c2 40 60 4d 82 be 01 00 00 00 48 c7 c7 80 d1 23 83 e8 48 2a c4 fe e8 73 06 c8 fe 48 85 db 75 0e <0f> 0b 0f 1f 40 00 eb fe 66 0f 1f 44 00 00 48 83 c4 10 48 89 d8 [ 163.734501] RIP [<ffffffff824d6062>] phonet_pernet+0x182/0x1a0 [ 163.734501] RSP <ffff8800674d5ca8> [ 163.861289] ---[ end trace fb5615826c548066 ]--- After investigation it turns out there were two issues. 1) Phonet was not implementing network devices but was using register_pernet_device instead of register_pernet_subsys. This was allowing there to be cases when phonenet was not initialized and the phonet net_generic was not set for a network namespace when network device events were being reported on the netdevice_notifier for a network namespace leading to the oops above. 2) phonet_exit_net was implementing a confusing and special case of handling all network devices from going away that it was hard to see was correct, and would only occur when the phonet module was removed. Now that unregister_netdevice_notifier has been modified to synthesize unregistration events for the network devices that are extant when called this confusing special case in phonet_exit_net is no longer needed. Signed-off-by: Eric W. Biederman <ebiederm@xmission.com> Acked-by: Rémi Denis-Courmont <remi.denis-courmont@nokia.com> Signed-off-by: David S. Miller <davem@davemloft.net>
A phonet packet is limited to USHRT_MAX bytes, this is never checked during tx which means that the user can specify any size he wishes, and the kernel will attempt to allocate that size. In the good case, it'll lead to the following warning, but it may also cause the kernel to kick in the OOM and kill a random task on the server. [ 8921.744094] WARNING: at mm/page_alloc.c:2255 __alloc_pages_slowpath+0x65/0x730() [ 8921.749770] Pid: 5081, comm: trinity Tainted: G W 3.4.0-rc1-next-20120402-sasha #46 [ 8921.756672] Call Trace: [ 8921.758185] [<ffffffff810b2ba7>] warn_slowpath_common+0x87/0xb0 [ 8921.762868] [<ffffffff810b2be5>] warn_slowpath_null+0x15/0x20 [ 8921.765399] [<ffffffff8117eae5>] __alloc_pages_slowpath+0x65/0x730 [ 8921.769226] [<ffffffff81179c8a>] ? zone_watermark_ok+0x1a/0x20 [ 8921.771686] [<ffffffff8117d045>] ? get_page_from_freelist+0x625/0x660 [ 8921.773919] [<ffffffff8117f3a8>] __alloc_pages_nodemask+0x1f8/0x240 [ 8921.776248] [<ffffffff811c03e0>] kmalloc_large_node+0x70/0xc0 [ 8921.778294] [<ffffffff811c4bd4>] __kmalloc_node_track_caller+0x34/0x1c0 [ 8921.780847] [<ffffffff821b0e3c>] ? sock_alloc_send_pskb+0xbc/0x260 [ 8921.783179] [<ffffffff821b3c65>] __alloc_skb+0x75/0x170 [ 8921.784971] [<ffffffff821b0e3c>] sock_alloc_send_pskb+0xbc/0x260 [ 8921.787111] [<ffffffff821b002e>] ? release_sock+0x7e/0x90 [ 8921.788973] [<ffffffff821b0ff0>] sock_alloc_send_skb+0x10/0x20 [ 8921.791052] [<ffffffff824cfc20>] pep_sendmsg+0x60/0x380 [ 8921.792931] [<ffffffff824cb4a6>] ? pn_socket_bind+0x156/0x180 [ 8921.794917] [<ffffffff824cb50f>] ? pn_socket_autobind+0x3f/0x90 [ 8921.797053] [<ffffffff824cb63f>] pn_socket_sendmsg+0x4f/0x70 [ 8921.798992] [<ffffffff821ab8e7>] sock_aio_write+0x187/0x1b0 [ 8921.801395] [<ffffffff810e325e>] ? sub_preempt_count+0xae/0xf0 [ 8921.803501] [<ffffffff8111842c>] ? __lock_acquire+0x42c/0x4b0 [ 8921.805505] [<ffffffff821ab760>] ? __sock_recv_ts_and_drops+0x140/0x140 [ 8921.807860] [<ffffffff811e07cc>] do_sync_readv_writev+0xbc/0x110 [ 8921.809986] [<ffffffff811958e7>] ? might_fault+0x97/0xa0 [ 8921.811998] [<ffffffff817bd99e>] ? security_file_permission+0x1e/0x90 [ 8921.814595] [<ffffffff811e17e2>] do_readv_writev+0xe2/0x1e0 [ 8921.816702] [<ffffffff810b8dac>] ? do_setitimer+0x1ac/0x200 [ 8921.818819] [<ffffffff810e2ec1>] ? get_parent_ip+0x11/0x50 [ 8921.820863] [<ffffffff810e325e>] ? sub_preempt_count+0xae/0xf0 [ 8921.823318] [<ffffffff811e1926>] vfs_writev+0x46/0x60 [ 8921.825219] [<ffffffff811e1a3f>] sys_writev+0x4f/0xb0 [ 8921.827127] [<ffffffff82658039>] system_call_fastpath+0x16/0x1b [ 8921.829384] ---[ end trace dffe390f30db9eb7 ]--- Signed-off-by: Sasha Levin <levinsasha928@gmail.com> Acked-by: Rémi Denis-Courmont <remi.denis-courmont@nokia.com> Signed-off-by: David S. Miller <davem@davemloft.net>
commit a9b3cd7f32 (rcu: convert uses of rcu_assign_pointer(x, NULL) to RCU_INIT_POINTER) did a lot of incorrect changes, since it did a complete conversion of rcu_assign_pointer(x, y) to RCU_INIT_POINTER(x, y). We miss needed barriers, even on x86, when y is not NULL. Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> CC: Stephen Hemminger <shemminger@vyatta.com> CC: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
This provides flexibility to set the pipe handle using setsockopt. The pipe can be enabled (if disabled) later using ioctl. Signed-off-by: Hemant Ramdasi <hemant.ramdasi@stericsson.com> Signed-off-by: Dinesh Kumar Sharma <dinesh.sharma@stericsson.com> Acked-by: Rémi Denis-Courmont <remi.denis-courmont@nokia.com> Signed-off-by: David S. Miller <davem@davemloft.net>
These files are non modular, but need to export symbols using the macros now living in export.h -- call out the include so that things won't break when we remove the implicit presence of module.h from everywhere. Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
With calls to modular infrastructure, these files really needs the full module.h header. Call it out so some of the cleanups of implicit and unrequired includes elsewhere can be cleaned up. Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
When assigning a NULL value to an RCU protected pointer, no barrier is needed. The rcu_assign_pointer, used to handle that but will soon change to not handle the special case. Convert all rcu_assign_pointer of NULL value. //smpl @@ expression P; @@ - rcu_assign_pointer(P, NULL) + RCU_INIT_POINTER(P, NULL) // </smpl> Signed-off-by: Stephen Hemminger <shemminger@vyatta.com> Acked-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
The message size allocated for rtnl ifinfo dumps was limited to a single page. This is not enough for additional interface info available with devices that support SR-IOV and caused a bug in which VF info would not be displayed if more than approximately 40 VFs were created per interface. Implement a new function pointer for the rtnl_register service that will calculate the amount of data required for the ifinfo dump and allocate enough data to satisfy the request. Signed-off-by: Greg Rose <gregory.v.rose@intel.com> Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
The %pK format specifier is designed to hide exposed kernel pointers, specifically via /proc interfaces. Exposing these pointers provides an easy target for kernel write vulnerabilities, since they reveal the locations of writable structures containing easily triggerable function pointers. The behavior of %pK depends on the kptr_restrict sysctl. If kptr_restrict is set to 0, no deviation from the standard %p behavior occurs. If kptr_restrict is set to 1, the default, if the current user (intended to be a reader via seq_printf(), etc.) does not have CAP_SYSLOG (currently in the LSM tree), kernel pointers using %pK are printed as 0's. If kptr_restrict is set to 2, kernel pointers using %pK are printed as 0's regardless of privileges. Replacing with 0's was chosen over the default "(null)", which cannot be parsed by userland %p, which expects "(nil)". The supporting code for kptr_restrict and %pK are currently in the -mm tree. This patch converts users of %p in net/ to %pK. Cases of printing pointers to the syslog are not covered, since this would eliminate useful information for postmortem debugging and the reading of the syslog is already optionally protected by the dmesg_restrict sysctl. Signed-off-by: Dan Rosenberg <drosenberg@vsecurity.com> Cc: James Morris <jmorris@namei.org> Cc: Eric Dumazet <eric.dumazet@gmail.com> Cc: Thomas Graf <tgraf@infradead.org> Cc: Eugene Teo <eugeneteo@kernel.org> Cc: Kees Cook <kees.cook@canonical.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: David S. Miller <davem@davemloft.net> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Eric Paris <eparis@parisplace.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: David S. Miller <davem@davemloft.net>
* git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next-2.6: (1446 commits) macvlan: fix panic if lowerdev in a bond tg3: Add braces around 5906 workaround. tg3: Fix NETIF_F_LOOPBACK error macvlan: remove one synchronize_rcu() call networking: NET_CLS_ROUTE4 depends on INET irda: Fix error propagation in ircomm_lmp_connect_response() irda: Kill set but unused variable 'bytes' in irlan_check_command_param() irda: Kill set but unused variable 'clen' in ircomm_connect_indication() rxrpc: Fix set but unused variable 'usage' in rxrpc_get_transport() be2net: Kill set but unused variable 'req' in lancer_fw_download() irda: Kill set but unused vars 'saddr' and 'daddr' in irlan_provider_connect_indication() atl1c: atl1c_resume() is only used when CONFIG_PM_SLEEP is defined. rxrpc: Fix set but unused variable 'usage' in rxrpc_get_peer(). rxrpc: Kill set but unused variable 'local' in rxrpc_UDP_error_handler() rxrpc: Kill set but unused variable 'sp' in rxrpc_process_connection() rxrpc: Kill set but unused variable 'sp' in rxrpc_rotate_tx_window() pkt_sched: Kill set but unused variable 'protocol' in tc_classify() isdn: capi: Use pr_debug() instead of ifdefs. tg3: Update version to 3.119 tg3: Apply rx_discards fix to 5719/5720 ... Fix up trivial conflicts in arch/x86/Kconfig and net/mac80211/agg-tx.c as per Davem.