- 02 Dec, 2015 2 commits
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Paolo Abeni authored
After 614732ea, no refcount is maintained for the vport-vxlan module. This allows the userspace to remove such module while vport-vxlan devices still exist, which leads to later oops. v1 -> v2: - move vport 'owner' initialization in ovs_vport_ops_register() and make such function a macro Fixes: 614732ea ("openvswitch: Use regular VXLAN net_device device") Signed-off-by:
Paolo Abeni <pabeni@redhat.com> Signed-off-by:
David S. Miller <davem@davemloft.net>
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Daniel Borkmann authored
During own review but also reported by Dmitry's syzkaller [1] it has been noticed that we trigger a heap out-of-bounds access on eBPF array maps when updating elements. This happens with each map whose map->value_size (specified during map creation time) is not multiple of 8 bytes. In array_map_alloc(), elem_size is round_up(attr->value_size, 8) and used to align array map slots for faster access. However, in function array_map_update_elem(), we update the element as ... memcpy(array->value + array->elem_size * index, value, array->elem_size); ... where we access 'value' out-of-bounds, since it was allocated from map_update_elem() from syscall side as kmalloc(map->value_size, GFP_USER) and later on copied through copy_from_user(value, uvalue, map->value_size). Thus, up to 7 bytes, we can access out-of-bounds. Same could happen from within an eBPF program, where in worst case we access beyond an eBPF program's designated stack. Since 1be7f75d ("bpf: enable non-root eBPF programs") didn't hit an official release yet, it only affects priviledged users. In case of array_map_lookup_elem(), the verifier prevents eBPF programs from accessing beyond map->value_size through check_map_access(). Also from syscall side map_lookup_elem() only copies map->value_size back to user, so nothing could leak. [1] http://github.com/google/syzkaller Fixes: 28fbcfa0 ("bpf: add array type of eBPF maps") Reported-by:
Dmitry Vyukov <dvyukov@google.com> Signed-off-by:
Daniel Borkmann <daniel@iogearbox.net> Acked-by:
Alexei Starovoitov <ast@kernel.org> Signed-off-by:
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- 01 Dec, 2015 5 commits
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Eric Dumazet authored
Dmitry provided a syzkaller (http://github.com/google/syzkaller) triggering a fault in sock_wake_async() when async IO is requested. Said program stressed af_unix sockets, but the issue is generic and should be addressed in core networking stack. The problem is that by the time sock_wake_async() is called, we should not access the @flags field of 'struct socket', as the inode containing this socket might be freed without further notice, and without RCU grace period. We already maintain an RCU protected structure, "struct socket_wq" so moving SOCKWQ_ASYNC_NOSPACE & SOCKWQ_ASYNC_WAITDATA into it is the safe route. It also reduces number of cache lines needing dirtying, so might provide a performance improvement anyway. In followup patches, we might move remaining flags (SOCK_NOSPACE, SOCK_PASSCRED, SOCK_PASSSEC) to save 8 bytes and let 'struct socket' being mostly read and let it being shared between cpus. Reported-by:
Eric Dumazet <edumazet@google.com> Signed-off-by:
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Eric Dumazet authored
This patch is a cleanup to make following patch easier to review. Goal is to move SOCK_ASYNC_NOSPACE and SOCK_ASYNC_WAITDATA from (struct socket)->flags to a (struct socket_wq)->flags to benefit from RCU protection in sock_wake_async() To ease backports, we rename both constants. Two new helpers, sk_set_bit(int nr, struct sock *sk) and sk_clear_bit(int net, struct sock *sk) are added so that following patch can change their implementation. Signed-off-by:
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Alexey Khoroshilov authored
vmxnet3_drv does not check dma_addr with dma_mapping_error() after mapping dma memory. The patch adds the checks and tries to handle failures. Found by Linux Driver Verification project (linuxtesting.org). Signed-off-by:
Alexey Khoroshilov <khoroshilov@ispras.ru> Acked-by:
Shrikrishna Khare <skhare@vmware.com> Signed-off-by:
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Peter Hurley authored
The N_X25 line discipline may access the previous line discipline's closed and already-freed private data on open [1]. The tty->disc_data field _never_ refers to valid data on entry to the line discipline's open() method. Rather, the ldisc is expected to initialize that field for its own use for the lifetime of the instance (ie. from open() to close() only). [1] [ 634.336761] ================================================================== [ 634.338226] BUG: KASAN: use-after-free in x25_asy_open_tty+0x13d/0x490 at addr ffff8800a743efd0 [ 634.339558] Read of size 4 by task syzkaller_execu/8981 [ 634.340359] ============================================================================= [ 634.341598] BUG kmalloc-512 (Not tainted): kasan: bad access detected ... [ 634.405018] Call Trace: [ 634.405277] dump_stack (lib/dump_stack.c:52) [ 634.405775] print_trailer (mm/slub.c:655) [ 634.406361] object_err (mm/slub.c:662) [ 634.406824] kasan_report_error (mm/kasan/report.c:138 mm/kasan/report.c:236) [ 634.409581] __asan_report_load4_noabort (mm/kasan/report.c:279) [ 634.411355] x25_asy_open_tty (drivers/net/wan/x25_asy.c:559 (discriminator 1)) [ 634.413997] tty_ldisc_open.isra.2 (drivers/tty/tty_ldisc.c:447) [ 634.414549] tty_set_ldisc (drivers/tty/tty_ldisc.c:567) [ 634.415057] tty_ioctl (drivers/tty/tty_io.c:2646 drivers/tty/tty_io.c:2879) [ 634.423524] do_vfs_ioctl (fs/ioctl.c:43 fs/ioctl.c:607) [ 634.427491] SyS_ioctl (fs/ioctl.c:622 fs/ioctl.c:613) [ 634.427945] entry_SYSCALL_64_fastpath (arch/x86/entry/entry_64.S:188) Reported-and-tested-by:Sasha Levin <sasha.levin@oracle.com> Cc: <stable@vger.kernel.org> Signed-off-by:
Peter Hurley <peter@hurleysoftware.com> Signed-off-by:
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Nicolas Dichtel authored
This reverts commit ab450605. In IPv6, we cannot inherit the dst of the original dst. ndisc packets are IPv6 packets and may take another route than the original packet. This patch breaks the following scenario: a packet comes from eth0 and is forwarded through vxlan1. The encapsulated packet triggers an NS which cannot be sent because of the wrong route. CC: Jiri Benc <jbenc@redhat.com> CC: Thomas Graf <tgraf@suug.ch> Signed-off-by:
Nicolas Dichtel <nicolas.dichtel@6wind.com> Signed-off-by:
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- 30 Nov, 2015 12 commits
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Eric Dumazet authored
Dmitry provided a syzkaller (http://github.com/google/syzkaller) generated program that triggers the WARNING at net/ipv4/tcp.c:1729 in tcp_recvmsg() : WARN_ON(tp->copied_seq != tp->rcv_nxt && !(flags & (MSG_PEEK | MSG_TRUNC))); His program is specifically attempting a Cross SYN TCP exchange, that we support (for the pleasure of hackers ?), but it looks we lack proper tcp->copied_seq initialization. Thanks again Dmitry for your report and testings. Signed-off-by:
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Mark Brown authored
The gianfar driver has recently been enabled on arm64 but fails to build since it check the return value of platform_get_irq() against NO_IRQ. Fix this by instead checking for a negative error code. Even on ARM where this code was previously being built this check was incorrect since platform_get_irq() returns a negative error code which may not be exactly the (unsigned int)(-1) that NO_IRQ is defined to be. Signed-off-by:
Mark Brown <broonie@kernel.org> Signed-off-by:
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Mark Brown authored
This driver can be built on arm64 but relies on NO_IRQ to check the return value of irq_of_parse_and_map() which fails to build on arm64 because the architecture does not provide a NO_IRQ. Fix this to correctly check the return value of irq_of_parse_and_map(). Even on ARM systems where the driver was previously used the check was broken since on ARM NO_IRQ is -1 but irq_of_parse_and_map() returns 0 on error. Signed-off-by:
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Hannes Frederic Sowa authored
sendpage did not care about credentials at all. This could lead to situations in which because of fd passing between processes we could append data to skbs with different scm data. It is illegal to splice those skbs together. Instead we have to allocate a new skb and if requested fill out the scm details. Fixes: 869e7c62 ("net: af_unix: implement stream sendpage support") Reported-by:
Al Viro <viro@zeniv.linux.org.uk> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Eric Dumazet <edumazet@google.com> Signed-off-by:
Hannes Frederic Sowa <hannes@stressinduktion.org> Signed-off-by:
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David S. Miller authored
Giuseppe Cavallaro says: ==================== Spare stmmac fixes These are some fixes for the stmmac d.d. tested on STi platforms. They are for some part of the PM, STi glue and rx path when test Jumbo. ==================== Signed-off-by: -
Giuseppe CAVALLARO authored
The receive skb buffers can be preallocated when the link is opened according to mtu size. While testing on a network environment with not standard MTU (e.g. 3000), a panic occurred if an incoming packet had a length greater than rx skb buffer size. This is because the HW is programmed to copy, from the DMA, an Jumbo frame and the Sw must check if the allocated buffer is enough to store the frame. Signed-off-by:
Alexandre TORGUE <alexandre.torgue@st.com> Signed-off-by:
Giuseppe Cavallaro <peppe.cavallaro@st.com> Signed-off-by:
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Giuseppe CAVALLARO authored
When stmmac_mdio_reset, was called from stmmac_resume, it was not resetting the PHY due to which MAC was not getting reset properly and hence ethernet interface not was resumed properly. The issue was currently only reproducible on stih301-b2204. Signed-off-by:
Pankaj Dev <pankaj.dev@st.com> Signed-off-by:
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Giuseppe CAVALLARO authored
In case of the st,tx-retime-src is missing from device-tree (it's an optional field) the driver will invoke the strcasecmp to check which clock has been selected and this is a bug; the else condition is needed. In the dwmac_setup, the "rs" variable, passed to the strcasecmp, was not initialized and the compiler, depending on the options adopted, could take it in some different part of the stack generating the hang in such configuration. Signed-off-by:
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Giuseppe CAVALLARO authored
This patch is to fix the csr clock in case of 300MHz is provided. Reported-by:
Kent Borg <Kent.Borg@csr.com> Signed-off-by:
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Giuseppe CAVALLARO authored
When resume the HW is re-configured but some settings can be lost. For example, the MAC Address_X High/Low Registers used for VLAN tagging.. So, while resuming, the set_filter callback needs to be invoked to re-program perfect and hash-table registers. Signed-off-by:
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Eric Dumazet authored
Once TX has been enabled on a NIC, it is illegal to access skb, as this skb might have been freed by another cpu, from TX completion handler. Signed-off-by:
Mark Rutland <mark.rutland@arm.com> Tested-by:
Iyappan Subramanian <isubramanian@apm.com> Signed-off-by:
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Martin Blumenstingl authored
Commit 9c707762 ("packet: make packet_snd fail on len smaller than l2 header") added validation for the packet size in packet_snd. This change enforces that every packet needs a header (with at least hard_header_len bytes) plus a payload with at least one byte. Before this change the payload was optional. This fixes PPPoE connections which do not have a "Service" or "Host-Uniq" configured (which is violating the spec, but is still widely used in real-world setups). Those are currently failing with the following message: "pppd: packet size is too short (24 <= 24)" Signed-off-by:
Martin Blumenstingl <martin.blumenstingl@googlemail.com> Signed-off-by:
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- 25 Nov, 2015 2 commits
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Daniel Borkmann authored
Currently, when having map file descriptors pointing to program arrays, there's still the issue that we unconditionally flush program array contents via bpf_fd_array_map_clear() in bpf_map_release(). This happens when such a file descriptor is released and is independent of the map's refcount. Having this flush independent of the refcount is for a reason: there can be arbitrary complex dependency chains among tail calls, also circular ones (direct or indirect, nesting limit determined during runtime), and we need to make sure that the map drops all references to eBPF programs it holds, so that the map's refcount can eventually drop to zero and initiate its freeing. Btw, a walk of the whole dependency graph would not be possible for various reasons, one being complexity and another one inconsistency, i.e. new programs can be added to parts of the graph at any time, so there's no guaranteed consistent state for the time of such a walk. Now, the program array pinning itself works, but the issue is that each derived file descriptor on close would nevertheless call unconditionally into bpf_fd_array_map_clear(). Instead, keep track of users and postpone this flush until the last reference to a user is dropped. As this only concerns a subset of references (f.e. a prog array could hold a program that itself has reference on the prog array holding it, etc), we need to track them separately. Short analysis on the refcounting: on map creation time usercnt will be one, so there's no change in behaviour for bpf_map_release(), if unpinned. If we already fail in map_create(), we are immediately freed, and no file descriptor has been made public yet. In bpf_obj_pin_user(), we need to probe for a possible map in bpf_fd_probe_obj() already with a usercnt reference, so before we drop the reference on the fd with fdput(). Therefore, if actual pinning fails, we need to drop that reference again in bpf_any_put(), otherwise we keep holding it. When last reference drops on the inode, the bpf_any_put() in bpf_evict_inode() will take care of dropping the usercnt again. In the bpf_obj_get_user() case, the bpf_any_get() will grab a reference on the usercnt, still at a time when we have the reference on the path. Should we later on fail to grab a new file descriptor, bpf_any_put() will drop it, otherwise we hold it until bpf_map_release() time. Joint work with Alexei. Fixes: b2197755 ("bpf: add support for persistent maps/progs") Signed-off-by:
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Christoph Biedl authored
Commit 35a4a573 ("isdn: clean up debug format string usage") introduced a safeguard to avoid accidential format string interpolation of data when calling debugl1 or HiSax_putstatus. This did however not take into account VHiSax_putstatus (called by HiSax_putstatus) does *not* call vsprintf if the head parameter is NULL - the format string is treated as plain text then instead. As a result, the string "%s" is processed literally, and the actual information is lost. This affects the isdnlog userspace program which stopped logging information since that commit. So revert the HiSax_putstatus invocations to the previous state. Fixes: 35a4a573 ("isdn: clean up debug format string usage") Cc: Kees Cook <keescook@chromium.org> Cc: Karsten Keil <isdn@linux-pingi.de> Signed-off-by:
Christoph Biedl <linux-kernel.bfrz@manchmal.in-ulm.de> Signed-off-by:
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- 24 Nov, 2015 11 commits
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Quentin Casasnovas authored
Sasha's found a NULL pointer dereference in the RDS connection code when sending a message to an apparently unbound socket. The problem is caused by the code checking if the socket is bound in rds_sendmsg(), which checks the rs_bound_addr field without taking a lock on the socket. This opens a race where rs_bound_addr is temporarily set but where the transport is not in rds_bind(), leading to a NULL pointer dereference when trying to dereference 'trans' in __rds_conn_create(). Vegard wrote a reproducer for this issue, so kindly ask him to share if you're interested. I cannot reproduce the NULL pointer dereference using Vegard's reproducer with this patch, whereas I could without. Complete earlier incomplete fix to CVE-2015-6937: 74e98eb0 ("RDS: verify the underlying transport exists before creating a connection") Cc: David S. Miller <davem@davemloft.net> Cc: stable@vger.kernel.org Reviewed-by:
Vegard Nossum <vegard.nossum@oracle.com> Reviewed-by:
Santosh Shilimkar <santosh.shilimkar@oracle.com> Signed-off-by:
Quentin Casasnovas <quentin.casasnovas@oracle.com> Signed-off-by:
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Aaron Conole authored
During pre-upstream development, the openvswitch datapath used a custom hashtable to store vports that could fail on delete due to lack of memory. However, prior to upstream submission, this code was reworked to use an hlist based hastable with flexible-array based buckets. As such the failure condition was eliminated from the vport_del path, rendering this comment invalid. Signed-off-by:
Aaron Conole <aconole@bytheb.org> Signed-off-by:
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Nikolay Aleksandrov authored
Since (at least) commit b17a7c17 ("[NET]: Do sysfs registration as part of register_netdevice."), netdev_run_todo() deals only with unregistration, so we don't need to do the rtnl_unlock/lock cycle to finish registration when failing pimreg or dvmrp device creation. In fact that opens a race condition where someone can delete the device while rtnl is unlocked because it's fully registered. The problem gets worse when netlink support is introduced as there are more points of entry that can cause it and it also makes reusing that code correctly impossible. Signed-off-by:
Nikolay Aleksandrov <nikolay@cumulusnetworks.com> Reviewed-by:
Cong Wang <cwang@twopensource.com> Signed-off-by:
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David Howells authored
Normally, the transmit phase of a client call is implicitly ack'd by the reception of the first data packet of the response being received. However, if a security negotiation happens, the transmit phase, if it is entirely contained in a single packet, may get an ack packet in response and then may get aborted due to security negotiation failure. Because the client has shifted state to RXRPC_CALL_CLIENT_AWAIT_REPLY due to having transmitted all the data, the code that handles processing of the received ack packet doesn't note the hard ack the data packet. The following abort packet in the case of security negotiation failure then incurs an assertion failure when it tries to drain the Tx queue because the hard ack state is out of sync (hard ack means the packets have been processed and can be discarded by the sender; a soft ack means that the packets are received but could still be discarded and rerequested by the receiver). To fix this, we should record the hard ack we received for the ack packet. The assertion failure looks like: RxRPC: Assertion failed 1 <= 0 is false 0x1 <= 0x0 is false ------------[ cut here ]------------ kernel BUG at ../net/rxrpc/ar-ack.c:431! ... RIP: 0010:[<ffffffffa006857b>] [<ffffffffa006857b>] rxrpc_rotate_tx_window+0xbc/0x131 [af_rxrpc] ... Signed-off-by:
David Howells <dhowells@redhat.com> Signed-off-by:
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Michal Kubeček authored
If a fragmented multicast packet is received on an ethernet device which has an active macvlan on top of it, each fragment is duplicated and received both on the underlying device and the macvlan. If some fragments for macvlan are processed before the whole packet for the underlying device is reassembled, the "overlapping fragments" test in ip6_frag_queue() discards the whole fragment queue. To resolve this, add device ifindex to the search key and require it to match reassembling multicast packets and packets to link-local addresses. Note: similar patch has been already submitted by Yoshifuji Hideaki in http://patchwork.ozlabs.org/patch/220979/ but got lost and forgotten for some reason. Signed-off-by:
Michal Kubecek <mkubecek@suse.cz> Signed-off-by:
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Iyappan Subramanian authored
Fixing kernel crash when doing ifconfig down and up in a loop, [ 124.028237] Call trace: [ 124.030670] [<ffffffc000367ce0>] memcpy+0x20/0x180 [ 124.035436] [<ffffffc00053c250>] skb_clone+0x3c/0xa8 [ 124.040374] [<ffffffc00053ffa4>] __skb_tstamp_tx+0xc0/0x118 [ 124.045918] [<ffffffc00054000c>] skb_tstamp_tx+0x10/0x1c [ 124.051203] [<ffffffc00049bc84>] xgene_enet_start_xmit+0x2e4/0x33c [ 124.057352] [<ffffffc00054fc20>] dev_hard_start_xmit+0x2e8/0x400 [ 124.063327] [<ffffffc00056cb14>] sch_direct_xmit+0x90/0x1d4 [ 124.068870] [<ffffffc000550100>] __dev_queue_xmit+0x28c/0x498 [ 124.074585] [<ffffffc00055031c>] dev_queue_xmit_sk+0x10/0x1c [ 124.080216] [<ffffffc0005c3f14>] ip_finish_output2+0x3d0/0x438 [ 124.086017] [<ffffffc0005c5794>] ip_finish_output+0x198/0x1ac [ 124.091732] [<ffffffc0005c61d4>] ip_output+0xec/0x164 [ 124.096755] [<ffffffc0005c5910>] ip_local_out_sk+0x38/0x48 [ 124.102211] [<ffffffc0005c5d84>] ip_queue_xmit+0x288/0x330 [ 124.107668] [<ffffffc0005da8bc>] tcp_transmit_skb+0x908/0x964 [ 124.113383] [<ffffffc0005dc0d4>] tcp_send_ack+0x128/0x138 [ 124.118753] [<ffffffc0005d1580>] __tcp_ack_snd_check+0x5c/0x94 [ 124.124555] [<ffffffc0005d7a0c>] tcp_rcv_established+0x554/0x68c [ 124.130530] [<ffffffc0005df0d4>] tcp_v4_do_rcv+0xa4/0x37c [ 124.135900] [<ffffffc000539430>] release_sock+0xb4/0x150 [ 124.141184] [<ffffffc0005cdf88>] tcp_recvmsg+0x448/0x9e0 [ 124.146468] [<ffffffc0005f2f3c>] inet_recvmsg+0xa0/0xc0 [ 124.151666] [<ffffffc000533660>] sock_recvmsg+0x10/0x1c [ 124.156863] [<ffffffc0005370d4>] SyS_recvfrom+0xa4/0xf8 [ 124.162061] Code: f2400c84 540001c0 cb040042 36000064 (38401423) [ 124.168133] ---[ end trace 7ab2550372e8a65b ]--- The fix was to reorder napi_enable, napi_disable, request_irq and free_irq calls, move register_netdev after dma_coerce_mask_and_coherent. Signed-off-by:
Khuong Dinh <kdinh@apm.com> Signed-off-by:
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Bjørn Mork authored
Commit 77b0a099 ("cdc-ncm: use common parser") added a dangerous new trust in the CDC functional descriptors presented by the device, unconditionally assuming that any device handled by the driver has a CDC Union descriptor. This descriptor is required by the NCM and MBIM specs, but crashing on non-compliant devices is still unacceptable. Not only will that allow malicious devices to crash the kernel, but in this case it is also well known that there are non-compliant real devices on the market - as shown by the comment accompanying the IAD workaround in the same function. The Sierra Wireless EM7305 is an example of such device, having a CDC header and a CDC MBIM descriptor but no CDC Union: Interface Descriptor: bLength 9 bDescriptorType 4 bInterfaceNumber 12 bAlternateSetting 0 bNumEndpoints 1 bInterfaceClass 2 Communications bInterfaceSubClass 14 bInterfaceProtocol 0 iInterface 0 CDC Header: bcdCDC 1.10 CDC MBIM: bcdMBIMVersion 1.00 wMaxControlMessage 4096 bNumberFilters 16 bMaxFilterSize 128 wMaxSegmentSize 4064 bmNetworkCapabilities 0x20 8-byte ntb input size Endpoint Descriptor: .. The conversion to a common parser also left the local cdc_union variable untouched. This caused the IAD workaround code to be applied to all devices with an IAD descriptor, which was never intended. Finish the conversion by testing for hdr.usb_cdc_union_desc instead. Cc: Oliver Neukum <oneukum@suse.com> Fixes: 77b0a099 ("cdc-ncm: use common parser") Signed-off-by:
Bjørn Mork <bjorn@mork.no> Signed-off-by:
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David S. Miller authored
Merge tag 'linux-can-fixes-for-4.4-20151123' of git://git.kernel.org/pub/scm/linux/kernel/git/mkl/linux-can Marc Kleine-Budde says: ==================== pull-request: can 2015-11-23 this is a pull request of three patches for the upcoming v4.4 release. The first patch is by Mirza Krak, it fixes a problem with the sja1000 driver after resuming from suspend to disk, by clearing all outstanding interrupts. Oliver Hartkopp contributes two patches targeting almost all driver, they fix the assignment of the error location in CAN error messages. ==================== Signed-off-by:
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Ying Xue authored
Coverity says: *** CID 1338065: Error handling issues (CHECKED_RETURN) /net/tipc/udp_media.c: 162 in tipc_udp_send_msg() 156 struct udp_media_addr *dst = (struct udp_media_addr *)&dest->value; 157 struct udp_media_addr *src = (struct udp_media_addr *)&b->addr.value; 158 struct sk_buff *clone; 159 struct rtable *rt; 160 161 if (skb_headroom(skb) < UDP_MIN_HEADROOM) >>> CID 1338065: Error handling issues (CHECKED_RETURN) >>> Calling "pskb_expand_head" without checking return value (as is done elsewhere 51 out of 56 times). 162 pskb_expand_head(skb, UDP_MIN_HEADROOM, 0, GFP_ATOMIC); 163 164 clone = skb_clone(skb, GFP_ATOMIC); 165 skb_set_inner_protocol(clone, htons(ETH_P_TIPC)); 166 ub = rcu_dereference_rtnl(b->media_ptr); 167 if (!ub) { When expanding buffer headroom over udp tunnel with pskb_expand_head(), it's unfortunate that we don't check its return value. As a result, if the function returns an error code due to the lack of memory, it may cause unpredictable consequence as we unconditionally consider that it's always successful. Fixes: e5356794 ("tipc: conditionally expand buffer headroom over udp tunnel") Reported-by: <scan-admin@coverity.com> Cc: Stephen Hemminger <stephen@networkplumber.org> Signed-off-by:Ying Xue <ying.xue@windriver.com> Signed-off-by:
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Ying Xue authored
Even if we drain receive queue thoroughly in tipc_release() after tipc socket is removed from rhashtable, it is possible that some packets are in flight because some CPU runs receiver and did rhashtable lookup before we removed socket. They will achieve receive queue, but nobody delete them at all. To avoid this leak, we register a private socket destructor to purge receive queue, meaning releasing packets pending on receive queue will be delayed until the last reference of tipc socket will be released. Signed-off-by:
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Aaro Koskinen authored
Commit fcb26ec5 ("broadcom: move all PHY_ID's to header") updated broadcom_tbl to use PHY_IDs, but incorrectly replaced 0x0143bca0 with PHY_ID_BCM5482 (making a duplicate entry, and completely omitting the original). Fix that. Fixes: fcb26ec5 ("broadcom: move all PHY_ID's to header") Signed-off-by:
Aaro Koskinen <aaro.koskinen@iki.fi> Signed-off-by:
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- 23 Nov, 2015 8 commits
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Nikolay Aleksandrov authored
When vrf's ->newlink is called, if register_netdevice() fails then it does free_netdev(), but that's also done by rtnl_newlink() so a second free happens and memory gets corrupted, to reproduce execute the following line a couple of times (1 - 5 usually is enough): $ for i in `seq 1 5`; do ip link add vrf: type vrf table 1; done; This works because we fail in register_netdevice() because of the wrong name "vrf:". And here's a trace of one crash: [ 28.792157] ------------[ cut here ]------------ [ 28.792407] kernel BUG at fs/namei.c:246! [ 28.792608] invalid opcode: 0000 [#1] SMP [ 28.793240] Modules linked in: vrf nfsd auth_rpcgss oid_registry nfs_acl nfs lockd grace sunrpc crct10dif_pclmul crc32_pclmul crc32c_intel qxl drm_kms_helper ttm drm aesni_intel aes_x86_64 psmouse glue_helper lrw evdev gf128mul i2c_piix4 ablk_helper cryptd ppdev parport_pc parport serio_raw pcspkr virtio_balloon virtio_console i2c_core acpi_cpufreq button 9pnet_virtio 9p 9pnet fscache ipv6 autofs4 ext4 crc16 mbcache jbd2 virtio_blk virtio_net sg sr_mod cdrom ata_generic ehci_pci uhci_hcd ehci_hcd e1000 usbcore usb_common ata_piix libata virtio_pci virtio_ring virtio scsi_mod floppy [ 28.796016] CPU: 0 PID: 1148 Comm: ld-linux-x86-64 Not tainted 4.4.0-rc1+ #24 [ 28.796016] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.8.1-20150318_183358- 04/01/2014 [ 28.796016] task: ffff8800352561c0 ti: ffff88003592c000 task.ti: ffff88003592c000 [ 28.796016] RIP: 0010:[<ffffffff812187b3>] [<ffffffff812187b3>] putname+0x43/0x60 [ 28.796016] RSP: 0018:ffff88003592fe88 EFLAGS: 00010246 [ 28.796016] RAX: 0000000000000000 RBX: ffff8800352561c0 RCX: 0000000000000001 [ 28.796016] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff88003784f000 [ 28.796016] RBP: ffff88003592ff08 R08: 0000000000000001 R09: 0000000000000000 [ 28.796016] R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000000 [ 28.796016] R13: 000000000000047c R14: ffff88003784f000 R15: ffff8800358c4a00 [ 28.796016] FS: 0000000000000000(0000) GS:ffff88003fc00000(0000) knlGS:0000000000000000 [ 28.796016] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 28.796016] CR2: 00007ffd583bc2d9 CR3: 0000000035a99000 CR4: 00000000000406f0 [ 28.796016] Stack: [ 28.796016] ffffffff8121045d ffffffff812102d3 ffff8800352561c0 ffff880035a91660 [ 28.796016] ffff8800008a9880 0000000000000000 ffffffff81a49940 00ffffff81218684 [ 28.796016] ffff8800352561c0 000000000000047c 0000000000000000 ffff880035b36d80 [ 28.796016] Call Trace: [ 28.796016] [<ffffffff8121045d>] ? do_execveat_common.isra.34+0x74d/0x930 [ 28.796016] [<ffffffff812102d3>] ? do_execveat_common.isra.34+0x5c3/0x930 [ 28.796016] [<ffffffff8121066c>] do_execve+0x2c/0x30 [ 28.796016] [<ffffffff810939a0>] call_usermodehelper_exec_async+0xf0/0x140 [ 28.796016] [<ffffffff810938b0>] ? umh_complete+0x40/0x40 [ 28.796016] [<ffffffff815cb1af>] ret_from_fork+0x3f/0x70 [ 28.796016] Code: 48 8d 47 1c 48 89 e5 53 48 8b 37 48 89 fb 48 39 c6 74 1a 48 8b 3d 7e e9 8f 00 e8 49 fa fc ff 48 89 df e8 f1 01 fd ff 5b 5d f3 c3 <0f> 0b 48 89 fe 48 8b 3d 61 e9 8f 00 e8 2c fa fc ff 5b 5d eb e9 [ 28.796016] RIP [<ffffffff812187b3>] putname+0x43/0x60 [ 28.796016] RSP <ffff88003592fe88> Fixes: 193125db ("net: Introduce VRF device driver") Signed-off-by:
David Ahern <dsa@cumulusnetworks.com> Signed-off-by:
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Dan Carpenter authored
WARN_ON_ONCE() takes a condition, it doesn't take an error message. I have converted this to WARN() instead. Signed-off-by:
Dan Carpenter <dan.carpenter@oracle.com> Signed-off-by:
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Rainer Weikusat authored
Rainer Weikusat <rweikusat@mobileactivedefense.com> writes: An AF_UNIX datagram socket being the client in an n:1 association with some server socket is only allowed to send messages to the server if the receive queue of this socket contains at most sk_max_ack_backlog datagrams. This implies that prospective writers might be forced to go to sleep despite none of the message presently enqueued on the server receive queue were sent by them. In order to ensure that these will be woken up once space becomes again available, the present unix_dgram_poll routine does a second sock_poll_wait call with the peer_wait wait queue of the server socket as queue argument (unix_dgram_recvmsg does a wake up on this queue after a datagram was received). This is inherently problematic because the server socket is only guaranteed to remain alive for as long as the client still holds a reference to it. In case the connection is dissolved via connect or by the dead peer detection logic in unix_dgram_sendmsg, the server socket may be freed despite "the polling mechanism" (in particular, epoll) still has a pointer to the corresponding peer_wait queue. There's no way to forcibly deregister a wait queue with epoll. Based on an idea by Jason Baron, the patch below changes the code such that a wait_queue_t belonging to the client socket is enqueued on the peer_wait queue of the server whenever the peer receive queue full condition is detected by either a sendmsg or a poll. A wake up on the peer queue is then relayed to the ordinary wait queue of the client socket via wake function. The connection to the peer wait queue is again dissolved if either a wake up is about to be relayed or the client socket reconnects or a dead peer is detected or the client socket is itself closed. This enables removing the second sock_poll_wait from unix_dgram_poll, thus avoiding the use-after-free, while still ensuring that no blocked writer sleeps forever. Signed-off-by:
Rainer Weikusat <rweikusat@mobileactivedefense.com> Fixes: ec0d215f ("af_unix: fix 'poll for write'/connected DGRAM sockets") Reviewed-by:
Jason Baron <jbaron@akamai.com> Signed-off-by:
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Nina Schiff authored
The classid of a process is changed either when a process is moved to or from a cgroup or when the net_cls.classid file is updated. Previously net_cls only supported propogating these changes to the cgroup's related sockets when a process was added or removed from the cgroup. This means it was neccessary to remove and re-add all processes to a cgroup in order to update its classid. This change introduces support for doing this dynamically - i.e. when the value is changed in the net_cls_classid file, this will also trigger an update to the classid associated with all sockets controlled by the cgroup. This mimics the behaviour of other cgroup subsystems. net_prio circumvents this issue by storing an index into a table with each socket (and so any updates to the table, don't require updating the value associated with the socket). net_cls, however, passes the socket the classid directly, and so this additional step is needed. Signed-off-by:
Nina Schiff <ninasc@fb.com> Acked-by:
Tejun Heo <tj@kernel.org> Signed-off-by:
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Shaohui Xie authored
Freescale hosts some ARMv8 based SoCs, and a generic convention ARCH_LAYERSCAPE is used to cover such SoCs. Adding ARCH_LAYERSCAPE to dependencies of NET_VENDOR_FREESCALE to support networking on those SoCs. The ARCH_LAYERSCAPE is introduced by: commit: 53a5fde0 arm64: Use generic Layerscape SoC family naming Signed-off-by:
Shaohui Xie <Shaohui.Xie@freescale.com> Signed-off-by:
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Oliver Hartkopp authored
The assignment 'cf->data[2] |= CAN_ERR_PROT_UNSPEC' used at CAN error message creation time is obsolete as CAN_ERR_PROT_UNSPEC is zero and cf->data[2] is initialized with zero in alloc_can_err_skb() anyway. So we could either assign 'cf->data[2] = CAN_ERR_PROT_UNSPEC' correctly or we can remove the obsolete OR operation entirely. Signed-off-by:
Oliver Hartkopp <socketcan@hartkopp.net> Signed-off-by:
Marc Kleine-Budde <mkl@pengutronix.de>
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Oliver Hartkopp authored
As Dan Carpenter reported in http://marc.info/?l=linux-can&m=144793696016187 the assignment of the error location in CAN error messages had some bit wise overlaps. Indeed the value to be assigned in data[3] is no bitfield but defines a single value which points to a location inside the CAN frame on the wire. This patch fixes the assignments for the error locations in error messages. Reported-by:
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Mirza Krak authored
According to SJA1000 data sheet error-warning (EI) interrupt is not cleared by setting the controller in to reset-mode. Then if we have the following case: - system is suspended (echo mem > /sys/power/state) and SJA1000 is left in operating state - A bus error condition occurs which activates EI interrupt, system is still suspended which means EI interrupt will be not be handled nor cleared. If the above two events occur, on resume there is no way to return the SJA1000 to operating state, except to cycle power to it. By simply reading the IR register on start we will clear any previous conditions that could be present. Signed-off-by:
Mirza Krak <mirza.krak@hostmobility.com> Reported-by:
Christian Magnusson <Christian.Magnusson@semcon.com> Cc: linux-stable <stable@vger.kernel.org> Signed-off-by:
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