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* net: remove empty netlink_tap_exit_netLi RongQing2019-06-141-5/+0
| | | | | | | | | | Pointer members of an object with static storage duration, if not explicitly initialized, will be initialized to a NULL pointer. The net namespace API checks if this pointer is not NULL before using it, it are safe to remove the function. Signed-off-by: Li RongQing <lirongqing@baidu.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* net: netlink: make netlink_walk_start() void return typeTaehee Yoo2019-06-111-12/+3
| | | | | | | | | | netlink_walk_start() needed to return an error code because of rhashtable_walk_init(). but that was converted to rhashtable_walk_enter() and it is a void type function. so now netlink_walk_start() doesn't need any return value. Signed-off-by: Taehee Yoo <ap420073@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152Thomas Gleixner2019-05-301-5/+1
| | | | | | | | | | | | | | | | | | | | | Based on 1 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license as published by the free software foundation either version 2 of the license or at your option any later version extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 3029 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070032.746973796@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* net: Treat sock->sk_drops as an unsigned int when printingPatrick Talbert2019-05-191-1/+1
| | | | | | | | | | | Currently, procfs socket stats format sk_drops as a signed int (%d). For large values this will cause a negative number to be printed. We know the drop count can never be a negative so change the format specifier to %u. Signed-off-by: Patrick Talbert <ptalbert@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* net: netlink: Check address length before reading groups fieldTetsuo Handa2019-04-121-1/+2
| | | | | | | | KMSAN will complain if valid address length passed to bind() is shorter than sizeof(struct sockaddr_nl) bytes. Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> Signed-off-by: David S. Miller <davem@davemloft.net>
* rhashtable: Remove obsolete rhashtable_walk_init functionHerbert Xu2019-02-221-9/+1
| | | | | | | | | The rhashtable_walk_init function has been obsolete for more than two years. This patch finally converts its last users over to rhashtable_walk_enter and removes it. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: Johannes Berg <johannes.berg@intel.com>
* net: netlink: add helper to retrieve NETLINK_F_STRICT_CHKJakub Kicinski2019-01-191-0/+8
| | | | | | | | | Dumps can read state of the NETLINK_F_STRICT_CHK flag from a field in the callback structure. For non-dump GET requests we need a way to access the state of that flag from a socket. Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* net: netlink: rename NETLINK_DUMP_STRICT_CHK -> NETLINK_GET_STRICT_CHKJakub Kicinski2018-12-141-2/+2
| | | | | | | | | | NETLINK_DUMP_STRICT_CHK can be used for all GET requests, dumps as well as doit handlers. Replace the DUMP in the name with GET make that clearer. Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com> Reviewed-by: David Ahern <dsahern@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* netlink: Add answer_flags to netlink_callbackDavid Ahern2018-10-161-1/+2
| | | | | | | | | | | | | | | | | | With dump filtering we need a way to ensure the NLM_F_DUMP_FILTERED flag is set on a message back to the user if the data returned is influenced by some input attributes. Normally this can be done as messages are added to the skb, but if the filter results in no data being returned, the user could be confused as to why. This patch adds answer_flags to the netlink_callback allowing dump handlers to set the NLM_F_DUMP_FILTERED at a minimum in the NLMSG_DONE message ensuring the flag gets back to the user. The netlink_callback space is initialized to 0 via a memset in __netlink_dump_start, so init of the new answer_flags is covered. Signed-off-by: David Ahern <dsahern@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* netlink: Add new socket option to enable strict checking on dumpsDavid Ahern2018-10-081-1/+20
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Add a new socket option, NETLINK_DUMP_STRICT_CHK, that userspace can use via setsockopt to request strict checking of headers and attributes on dump requests. To get dump features such as kernel side filtering based on data in the header or attributes appended to the dump request, userspace must call setsockopt() for NETLINK_DUMP_STRICT_CHK and a non-zero value. Since the netlink sock and its flags are private to the af_netlink code, the strict checking flag is passed to dump handlers via a flag in the netlink_callback struct. For old userspace on new kernel there is no impact as all of the data checks in later patches are wrapped in a check on the new strict flag. For new userspace on old kernel, the setsockopt will fail and even if new userspace sets data in the headers and appended attributes the kernel will silently ignore it. Moving forward when the setsockopt succeeds, the new userspace on old kernel means the dump request can pass an attribute the kernel does not understand. The dump will then fail as the older kernel does not understand it. New userspace on new kernel setting the socket option gets the benefit of the improved data dump. Kernel side the NETLINK_DUMP_STRICT_CHK uapi is converted to a generic NETLINK_F_STRICT_CHK flag which can potentially be leveraged for tighter checking on the NEW, DEL, and SET commands. Signed-off-by: David Ahern <dsahern@gmail.com> Acked-by: Christian Brauner <christian@brauner.io> Signed-off-by: David S. Miller <davem@davemloft.net>
* netlink: Pass extack to dump handlersDavid Ahern2018-10-081-1/+11
| | | | | | | | | | | | Declare extack in netlink_dump and pass to dump handlers via netlink_callback. Add any extack message after the dump_done_errno allowing error messages to be returned. This will be useful when strict checking is done on dump requests, returning why the dump fails EINVAL. Signed-off-by: David Ahern <dsahern@gmail.com> Acked-by: Christian Brauner <christian@brauner.io> Signed-off-by: David S. Miller <davem@davemloft.net>
* netlink: remove hash::nelems check in netlink_insertLi RongQing2018-09-121-5/+0
| | | | | | | | | | | | | The type of hash::nelems has been changed from size_t to atom_t which in fact is int, so not need to check if BITS_PER_LONG, that is bit number of size_t, is bigger than 32 and rht_grow_above_max() will be called to check if hashtable is too big, ensure it can not bigger than 1<<31 Signed-off-by: Zhang Yu <zhangyu31@baidu.com> Signed-off-by: Li RongQing <lirongqing@baidu.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* netlink: Make groups check less stupid in netlink_bind()Dmitry Safonov2018-09-051-4/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | As Linus noted, the test for 0 is needless, groups type can follow the usual kernel style and 8*sizeof(unsigned long) is BITS_PER_LONG: > The code [..] isn't technically incorrect... > But it is stupid. > Why stupid? Because the test for 0 is pointless. > > Just doing > if (nlk->ngroups < 8*sizeof(groups)) > groups &= (1UL << nlk->ngroups) - 1; > > would have been fine and more understandable, since the "mask by shift > count" already does the right thing for a ngroups value of 0. Now that > test for zero makes me go "what's special about zero?". It turns out > that the answer to that is "nothing". [..] > The type of "groups" is kind of silly too. > > Yeah, "long unsigned int" isn't _technically_ wrong. But we normally > call that type "unsigned long". Cleanup my piece of pointlessness. Cc: "David S. Miller" <davem@davemloft.net> Cc: Herbert Xu <herbert@gondor.apana.org.au> Cc: Steffen Klassert <steffen.klassert@secunet.com> Cc: netdev@vger.kernel.org Fairly-blamed-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Dmitry Safonov <dima@arista.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* Merge ra.kernel.org:/pub/scm/linux/kernel/git/davem/netDavid S. Miller2018-08-051-2/+2
|\ | | | | | | | | | | | | | | | | | | | | Lots of overlapping changes, mostly trivial in nature. The mlxsw conflict was resolving using the example resolution at: https://github.com/jpirko/linux_mlxsw/blob/combined_queue/drivers/net/ethernet/mellanox/mlxsw/core_acl_flex_actions.c Signed-off-by: David S. Miller <davem@davemloft.net>
| * netlink: Don't shift on 64 for ngroupsDmitry Safonov2018-08-041-2/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | It's legal to have 64 groups for netlink_sock. As user-supplied nladdr->nl_groups is __u32, it's possible to subscribe only to first 32 groups. The check for correctness of .bind() userspace supplied parameter is done by applying mask made from ngroups shift. Which broke Android as they have 64 groups and the shift for mask resulted in an overflow. Fixes: 61f4b23769f0 ("netlink: Don't shift with UB on nlk->ngroups") Cc: "David S. Miller" <davem@davemloft.net> Cc: Herbert Xu <herbert@gondor.apana.org.au> Cc: Steffen Klassert <steffen.klassert@secunet.com> Cc: netdev@vger.kernel.org Cc: stable@vger.kernel.org Reported-and-Tested-by: Nathan Chancellor <natechancellor@gmail.com> Signed-off-by: Dmitry Safonov <dima@arista.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* | Merge ra.kernel.org:/pub/scm/linux/kernel/git/davem/netDavid S. Miller2018-08-021-0/+7
|\| | | | | | | | | | | | | | | | | | | The BTF conflicts were simple overlapping changes. The virtio_net conflict was an overlap of a fix of statistics counter, happening alongisde a move over to a bonafide statistics structure rather than counting value on the stack. Signed-off-by: David S. Miller <davem@davemloft.net>
| * netlink: Fix spectre v1 gadget in netlink_create()Jeremy Cline2018-08-011-0/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 'protocol' is a user-controlled value, so sanitize it after the bounds check to avoid using it for speculative out-of-bounds access to arrays indexed by it. This addresses the following accesses detected with the help of smatch: * net/netlink/af_netlink.c:654 __netlink_create() warn: potential spectre issue 'nlk_cb_mutex_keys' [w] * net/netlink/af_netlink.c:654 __netlink_create() warn: potential spectre issue 'nlk_cb_mutex_key_strings' [w] * net/netlink/af_netlink.c:685 netlink_create() warn: potential spectre issue 'nl_table' [w] (local cap) Cc: Josh Poimboeuf <jpoimboe@redhat.com> Signed-off-by: Jeremy Cline <jcline@redhat.com> Reviewed-by: Josh Poimboeuf <jpoimboe@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
| * netlink: Don't shift with UB on nlk->ngroupsDmitry Safonov2018-07-301-1/+5
| | | | | | | | | | | | | | | | | | | | | | On i386 nlk->ngroups might be 32 or 0. Which leads to UB, resulting in hang during boot. Check for 0 ngroups and use (unsigned long long) as a type to shift. Fixes: 7acf9d4237c4 ("netlink: Do not subscribe to non-existent groups"). Reported-by: kernel test robot <rong.a.chen@intel.com> Signed-off-by: Dmitry Safonov <dima@arista.com> Signed-off-by: David S. Miller <davem@davemloft.net>
| * netlink: Do not subscribe to non-existent groupsDmitry Safonov2018-07-291-0/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | Make ABI more strict about subscribing to group > ngroups. Code doesn't check for that and it looks bogus. (one can subscribe to non-existing group) Still, it's possible to bind() to all possible groups with (-1) Cc: "David S. Miller" <davem@davemloft.net> Cc: Herbert Xu <herbert@gondor.apana.org.au> Cc: Steffen Klassert <steffen.klassert@secunet.com> Cc: netdev@vger.kernel.org Signed-off-by: Dmitry Safonov <dima@arista.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* | netlink: do not store start function in netlink_cbFlorian Westphal2018-07-241-3/+2
|/ | | | | | | | ->start() is called once when dump is being initialized, there is no need to store it in netlink_cb. Signed-off-by: Florian Westphal <fw@strlen.de> Signed-off-by: David S. Miller <davem@davemloft.net>
* Revert changes to convert to ->poll_mask() and aio IOCB_CMD_POLLLinus Torvalds2018-06-281-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | The poll() changes were not well thought out, and completely unexplained. They also caused a huge performance regression, because "->poll()" was no longer a trivial file operation that just called down to the underlying file operations, but instead did at least two indirect calls. Indirect calls are sadly slow now with the Spectre mitigation, but the performance problem could at least be largely mitigated by changing the "->get_poll_head()" operation to just have a per-file-descriptor pointer to the poll head instead. That gets rid of one of the new indirections. But that doesn't fix the new complexity that is completely unwarranted for the regular case. The (undocumented) reason for the poll() changes was some alleged AIO poll race fixing, but we don't make the common case slower and more complex for some uncommon special case, so this all really needs way more explanations and most likely a fundamental redesign. [ This revert is a revert of about 30 different commits, not reverted individually because that would just be unnecessarily messy - Linus ] Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Christoph Hellwig <hch@lst.de> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* Merge branch 'work.aio-1' of ↵Linus Torvalds2018-06-041-1/+1
|\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs Pull aio updates from Al Viro: "Majority of AIO stuff this cycle. aio-fsync and aio-poll, mostly. The only thing I'm holding back for a day or so is Adam's aio ioprio - his last-minute fixup is trivial (missing stub in !CONFIG_BLOCK case), but let it sit in -next for decency sake..." * 'work.aio-1' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs: (46 commits) aio: sanitize the limit checking in io_submit(2) aio: fold do_io_submit() into callers aio: shift copyin of iocb into io_submit_one() aio_read_events_ring(): make a bit more readable aio: all callers of aio_{read,write,fsync,poll} treat 0 and -EIOCBQUEUED the same way aio: take list removal to (some) callers of aio_complete() aio: add missing break for the IOCB_CMD_FDSYNC case random: convert to ->poll_mask timerfd: convert to ->poll_mask eventfd: switch to ->poll_mask pipe: convert to ->poll_mask crypto: af_alg: convert to ->poll_mask net/rxrpc: convert to ->poll_mask net/iucv: convert to ->poll_mask net/phonet: convert to ->poll_mask net/nfc: convert to ->poll_mask net/caif: convert to ->poll_mask net/bluetooth: convert to ->poll_mask net/sctp: convert to ->poll_mask net/tipc: convert to ->poll_mask ...
| * net: convert datagram_poll users tp ->poll_maskChristoph Hellwig2018-05-261-1/+1
| | | | | | | | | | Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* | proc: introduce proc_create_net{,_data}Christoph Hellwig2018-05-161-16/+2
| | | | | | | | | | | | | | | | | | Variants of proc_create{,_data} that directly take a struct seq_operations and deal with network namespaces in ->open and ->release. All callers of proc_create + seq_open_net converted over, and seq_{open,release}_net are removed entirely. Signed-off-by: Christoph Hellwig <hch@lst.de>
* | net/netlink: make sure the headers line up actual value outputYU Bo2018-05-041-3/+3
|/ | | | | | | | | | | | | | | | Making sure the headers line up properly with the actual value output of the command `cat /proc/net/netlink` Before the patch: <sk Eth Pid Groups Rmem Wmem Dump Locks Drops Inode <ffff8cd2c2f7b000 0 909 00000550 0 0 0 2 0 18946 After the patch: >sk Eth Pid Groups Rmem Wmem Dump Locks Drops Inode >0000000033203952 0 897 00000113 0 0 0 2 0 14906 Signed-off-by: Bo YU <tsu.yubo@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* netlink: fix uninit-value in netlink_sendmsgEric Dumazet2018-04-071-0/+2
| | | | | | | | | | | | syzbot reported : BUG: KMSAN: uninit-value in ffs arch/x86/include/asm/bitops.h:432 [inline] BUG: KMSAN: uninit-value in netlink_sendmsg+0xb26/0x1310 net/netlink/af_netlink.c:1851 Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2") Signed-off-by: Eric Dumazet <edumazet@google.com> Reported-by: syzbot <syzkaller@googlegroups.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/netDavid S. Miller2018-04-011-0/+3
|\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | Minor conflicts in drivers/net/ethernet/mellanox/mlx5/core/en_rep.c, we had some overlapping changes: 1) In 'net' MLX5E_PARAMS_LOG_{SQ,RQ}_SIZE --> MLX5E_REP_PARAMS_LOG_{SQ,RQ}_SIZE 2) In 'net-next' params->log_rq_size is renamed to be params->log_rq_mtu_frames. 3) In 'net-next' params->hard_mtu is added. Signed-off-by: David S. Miller <davem@davemloft.net>
| * netlink: make sure nladdr has correct size in netlink_connect()Alexander Potapenko2018-03-251-0/+3
| | | | | | | | | | | | | | | | | | | | | | KMSAN reports use of uninitialized memory in the case when |alen| is smaller than sizeof(struct sockaddr_nl), and therefore |nladdr| isn't fully copied from the userspace. Signed-off-by: Alexander Potapenko <glider@google.com> Fixes: 1da177e4c3f41524 ("Linux-2.6.12-rc2") Reviewed-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* | net: Drop pernet_operations::asyncKirill Tkhai2018-03-271-2/+0
| | | | | | | | | | | | | | | | Synchronous pernet_operations are not allowed anymore. All are asynchronous. So, drop the structure member. Signed-off-by: Kirill Tkhai <ktkhai@virtuozzo.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* | Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/netDavid S. Miller2018-02-241-1/+3
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| * netlink: put module reference if dump start failsJason A. Donenfeld2018-02-221-1/+3
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Before, if cb->start() failed, the module reference would never be put, because cb->cb_running is intentionally false at this point. Users are generally annoyed by this because they can no longer unload modules that leak references. Also, it may be possible to tediously wrap a reference counter back to zero, especially since module.c still uses atomic_inc instead of refcount_inc. This patch expands the error path to simply call module_put if cb->start() fails. Fixes: 41c87425a1ac ("netlink: do not set cb_running if dump's start() errs") Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* | net: Convert netlink_tap_net_opsKirill Tkhai2018-02-131-0/+1
| | | | | | | | | | | | | | | | | | | | | | | | These pernet_operations init just allocated net memory, and they obviously can be executed in parallel in any others. v3: New Signed-off-by: Kirill Tkhai <ktkhai@virtuozzo.com> Acked-by: Andrei Vagin <avagin@virtuozzo.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* | net: Convert netlink_net_opsKirill Tkhai2018-02-131-0/+1
| | | | | | | | | | | | | | | | | | | | The methods of netlink_net_ops create and destroy "netlink" file, which are not interesting for foreigh pernet_operations. So, netlink_net_ops may safely be made async. Signed-off-by: Kirill Tkhai <ktkhai@virtuozzo.com> Acked-by: Andrei Vagin <avagin@virtuozzo.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* | net: make getname() functions return length rather than use int* parameterDenys Vlasenko2018-02-121-3/+2
|/ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Changes since v1: Added changes in these files: drivers/infiniband/hw/usnic/usnic_transport.c drivers/staging/lustre/lnet/lnet/lib-socket.c drivers/target/iscsi/iscsi_target_login.c drivers/vhost/net.c fs/dlm/lowcomms.c fs/ocfs2/cluster/tcp.c security/tomoyo/network.c Before: All these functions either return a negative error indicator, or store length of sockaddr into "int *socklen" parameter and return zero on success. "int *socklen" parameter is awkward. For example, if caller does not care, it still needs to provide on-stack storage for the value it does not need. None of the many FOO_getname() functions of various protocols ever used old value of *socklen. They always just overwrite it. This change drops this parameter, and makes all these functions, on success, return length of sockaddr. It's always >= 0 and can be differentiated from an error. Tests in callers are changed from "if (err)" to "if (err < 0)", where needed. rpc_sockname() lost "int buflen" parameter, since its only use was to be passed to kernel_getsockname() as &buflen and subsequently not used in any way. Userspace API is not changed. text data bss dec hex filename 30108430 2633624 873672 33615726 200ef6e vmlinux.before.o 30108109 2633612 873672 33615393 200ee21 vmlinux.o Signed-off-by: Denys Vlasenko <dvlasenk@redhat.com> CC: David S. Miller <davem@davemloft.net> CC: linux-kernel@vger.kernel.org CC: netdev@vger.kernel.org CC: linux-bluetooth@vger.kernel.org CC: linux-decnet-user@lists.sourceforge.net CC: linux-wireless@vger.kernel.org CC: linux-rdma@vger.kernel.org CC: linux-sctp@vger.kernel.org CC: linux-nfs@vger.kernel.org CC: linux-x25@vger.kernel.org Signed-off-by: David S. Miller <davem@davemloft.net>
* Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/netDavid S. Miller2018-01-191-1/+1
|\ | | | | | | | | | | | | | | | | | | | | The BPF verifier conflict was some minor contextual issue. The TUN conflict was less trivial. Cong Wang fixed a memory leak of tfile->tx_array in 'net'. This is an skb_array. But meanwhile in net-next tun changed tfile->tx_arry into tfile->tx_ring which is a ptr_ring. Signed-off-by: David S. Miller <davem@davemloft.net>
| * netlink: reset extack earlier in netlink_rcv_skbXin Long2018-01-181-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | Move up the extack reset/initialization in netlink_rcv_skb, so that those 'goto ack' will not skip it. Otherwise, later on netlink_ack may use the uninitialized extack and cause kernel crash. Fixes: cbbdf8433a5f ("netlink: extack needs to be reset each time through loop") Reported-by: syzbot+03bee3680a37466775e7@syzkaller.appspotmail.com Signed-off-by: Xin Long <lucien.xin@gmail.com> Acked-by: David Ahern <dsahern@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* | Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/netDavid S. Miller2018-01-171-1/+2
|\| | | | | | | | | | | | | | | Overlapping changes all over. The mini-qdisc bits were a little bit tricky, however. Signed-off-by: David S. Miller <davem@davemloft.net>
| * netlink: extack needs to be reset each time through loopDavid Ahern2018-01-151-1/+2
| | | | | | | | | | | | | | | | | | | | | | | | syzbot triggered the WARN_ON in netlink_ack testing the bad_attr value. The problem is that netlink_rcv_skb loops over the skb repeatedly invoking the callback and without resetting the extack leaving potentially stale data. Initializing each time through avoids the WARN_ON. Fixes: 2d4bc93368f5a ("netlink: extended ACK reporting") Reported-by: syzbot+315fa6766d0f7c359327@syzkaller.appspotmail.com Signed-off-by: David Ahern <dsahern@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* | net: delete /proc THIS_MODULE referencesAlexey Dobriyan2018-01-161-1/+0
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | /proc has been ignoring struct file_operations::owner field for 10 years. Specifically, it started with commit 786d7e1612f0b0adb6046f19b906609e4fe8b1ba ("Fix rmmod/read/write races in /proc entries"). Notice the chunk where inode->i_fop is initialized with proxy struct file_operations for regular files: - if (de->proc_fops) - inode->i_fop = de->proc_fops; + if (de->proc_fops) { + if (S_ISREG(inode->i_mode)) + inode->i_fop = &proc_reg_file_ops; + else + inode->i_fop = de->proc_fops; + } VFS stopped pinning module at this point. Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* | Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/netDavid S. Miller2017-12-161-0/+3
|\| | | | | | | | | | | | | Three sets of overlapping changes, two in the packet scheduler and one in the meson-gxl PHY driver. Signed-off-by: David S. Miller <davem@davemloft.net>
| * netlink: Add netns check on tapsKevin Cernekee2017-12-111-0/+3
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Currently, a nlmon link inside a child namespace can observe systemwide netlink activity. Filter the traffic so that nlmon can only sniff netlink messages from its own netns. Test case: vpnns -- bash -c "ip link add nlmon0 type nlmon; \ ip link set nlmon0 up; \ tcpdump -i nlmon0 -q -w /tmp/nlmon.pcap -U" & sudo ip xfrm state add src 10.1.1.1 dst 10.1.1.2 proto esp \ spi 0x1 mode transport \ auth sha1 0x6162633132330000000000000000000000000000 \ enc aes 0x00000000000000000000000000000000 grep --binary abc123 /tmp/nlmon.pcap Signed-off-by: Kevin Cernekee <cernekee@chromium.org> Signed-off-by: David S. Miller <davem@davemloft.net>
* | netlink: convert netlink tap spinlock to mutexCong Wang2017-12-111-6/+6
| | | | | | | | | | | | | | | | | | | | | | | | | | Both netlink_add_tap() and netlink_remove_tap() are called in process context, no need to bother spinlock. Note, in fact, currently we always hold RTNL when calling these two functions, so we don't need any other lock at all, but keeping this lock doesn't harm anything. Cc: Daniel Borkmann <daniel@iogearbox.net> Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* | netlink: make netlink tap per netnsCong Wang2017-12-111-17/+49
| | | | | | | | | | | | | | | | | | | | | | nlmon device is not supposed to capture netlink events from other netns, so instead of filtering events, we can simply make netlink tap itself per netns. Cc: Daniel Borkmann <daniel@iogearbox.net> Cc: Kevin Cernekee <cernekee@chromium.org> Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* | rhashtable: Change rhashtable_walk_start to return voidTom Herbert2017-12-111-2/+3
|/ | | | | | | | | | | | | | | | | | | | | | | | | Most callers of rhashtable_walk_start don't care about a resize event which is indicated by a return value of -EAGAIN. So calls to rhashtable_walk_start are wrapped wih code to ignore -EAGAIN. Something like this is common: ret = rhashtable_walk_start(rhiter); if (ret && ret != -EAGAIN) goto out; Since zero and -EAGAIN are the only possible return values from the function this check is pointless. The condition never evaluates to true. This patch changes rhashtable_walk_start to return void. This simplifies code for the callers that ignore -EAGAIN. For the few cases where the caller cares about the resize event, particularly where the table can be walked in mulitple parts for netlink or seq file dump, the function rhashtable_walk_start_check has been added that returns -EAGAIN on a resize event. Signed-off-by: Tom Herbert <tom@quantonium.net> Acked-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: David S. Miller <davem@davemloft.net>
* netlink: remove unnecessary forward declarationJohannes Berg2017-11-141-1/+0
| | | | | | | | netlink_skb_destructor() is actually defined before the first usage in the file, so remove the unnecessary forward declaration. Signed-off-by: Johannes Berg <johannes.berg@intel.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* af_netlink: ensure that NLMSG_DONE never fails in dumpsJason A. Donenfeld2017-11-131-6/+11
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The way people generally use netlink_dump is that they fill in the skb as much as possible, breaking when nla_put returns an error. Then, they get called again and start filling out the next skb, and again, and so forth. The mechanism at work here is the ability for the iterative dumping function to detect when the skb is filled up and not fill it past the brim, waiting for a fresh skb for the rest of the data. However, if the attributes are small and nicely packed, it is possible that a dump callback function successfully fills in attributes until the skb is of size 4080 (libmnl's default page-sized receive buffer size). The dump function completes, satisfied, and then, if it happens to be that this is actually the last skb, and no further ones are to be sent, then netlink_dump will add on the NLMSG_DONE part: nlh = nlmsg_put_answer(skb, cb, NLMSG_DONE, sizeof(len), NLM_F_MULTI); It is very important that netlink_dump does this, of course. However, in this example, that call to nlmsg_put_answer will fail, because the previous filling by the dump function did not leave it enough room. And how could it possibly have done so? All of the nla_put variety of functions simply check to see if the skb has enough tailroom, independent of the context it is in. In order to keep the important assumptions of all netlink dump users, it is therefore important to give them an skb that has this end part of the tail already reserved, so that the call to nlmsg_put_answer does not fail. Otherwise, library authors are forced to find some bizarre sized receive buffer that has a large modulo relative to the common sizes of messages received, which is ugly and buggy. This patch thus saves the NLMSG_DONE for an additional message, for the case that things are dangerously close to the brim. This requires keeping track of the errno from ->dump() across calls. Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* netlink: Allow ext_ack to carry non-error messagesDavid Ahern2017-11-011-9/+9
| | | | | | | | The NLMSGERR API already carries data (eg, a cookie) on the success path. Allow a message string to be returned as well. Signed-off-by: David Ahern <dsahern@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/netDavid S. Miller2017-10-221-4/+4
|\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | There were quite a few overlapping sets of changes here. Daniel's bug fix for off-by-ones in the new BPF branch instructions, along with the added allowances for "data_end > ptr + x" forms collided with the metadata additions. Along with those three changes came veritifer test cases, which in their final form I tried to group together properly. If I had just trimmed GIT's conflict tags as-is, this would have split up the meta tests unnecessarily. In the socketmap code, a set of preemption disabling changes overlapped with the rename of bpf_compute_data_end() to bpf_compute_data_pointers(). Changes were made to the mv88e6060.c driver set addr method which got removed in net-next. The hyperv transport socket layer had a locking change in 'net' which overlapped with a change of socket state macro usage in 'net-next'. Signed-off-by: David S. Miller <davem@davemloft.net>
| * netlink: fix netlink_ack() extack raceJohannes Berg2017-10-181-4/+4
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | It seems that it's possible to toggle NETLINK_F_EXT_ACK through setsockopt() while another thread/CPU is building a message inside netlink_ack(), which could then trigger the WARN_ON()s I added since if it goes from being turned off to being turned on between allocating and filling the message, the skb could end up being too small. Avoid this whole situation by storing the value of this flag in a separate variable and using that throughout the function instead. Fixes: 2d4bc93368f5 ("netlink: extended ACK reporting") Signed-off-by: Johannes Berg <johannes.berg@intel.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* | netlink: use NETLINK_CB(in_skb).sk instead of looking it upJohannes Berg2017-10-181-10/+2
|/ | | | | | | | | | | | | | | | | | When netlink_ack() reports an allocation error to the sending socket, there's no need to look up the sending socket since it's available in the SKB's CB. Use that instead of going to the trouble of looking it up. Note that the pointer is only available since Eric Biederman's commit 3fbc290540a1 ("netlink: Make the sending netlink socket availabe in NETLINK_CB") which is far newer than the original lookup code (Oct 2003) (though the field was called 'ssk' in that commit and only got renamed to 'sk' later, I'd actually argue 'ssk' was better - or perhaps it should've been 'source_sk' - since there are so many different 'sk's involved.) Signed-off-by: Johannes Berg <johannes.berg@intel.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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