linux-toradex.git/net/ieee802154, branch v4.4.136

net: ieee802154: fix net_device reference release too early

2018-04-13T17:50:10+00:00

[ Upstream commit a611c58b3d42a92e6b23423e166dd17c0c7fffce ]

This patch fixes the kernel oops when release net_device reference in
advance. In function raw_sendmsg(i think the dgram_sendmsg has the same
problem), there is a race condition between dev_put and dev_queue_xmit
when the device is gong that maybe lead to dev_queue_ximt to see
an illegal net_device pointer.

My test kernel is 3.13.0-32 and because i am not have a real 802154
device, so i change lowpan_newlink function to this:

        /* find and hold real wpan device */
        real_dev = dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
        if (!real_dev)
                return -ENODEV;
//      if (real_dev->type != ARPHRD_IEEE802154) {
//              dev_put(real_dev);
//              return -EINVAL;
//      }
        lowpan_dev_info(dev)->real_dev = real_dev;
        lowpan_dev_info(dev)->fragment_tag = 0;
        mutex_init(&lowpan_dev_info(dev)->dev_list_mtx);

Also, in order to simulate preempt, i change the raw_sendmsg function
to this:

        skb->dev = dev;
        skb->sk  = sk;
        skb->protocol = htons(ETH_P_IEEE802154);
        dev_put(dev);
        //simulate preempt
        schedule_timeout_uninterruptible(30 * HZ);
        err = dev_queue_xmit(skb);
        if (err > 0)
                err = net_xmit_errno(err);

and this is my userspace test code named test_send_data:

int main(int argc, char **argv)
{
        char buf[127];
        int sockfd;
        sockfd = socket(AF_IEEE802154, SOCK_RAW, 0);
        if (sockfd < 0) {
                printf("create sockfd error: %s\n", strerror(errno));
                return -1;
        }
        send(sockfd, buf, sizeof(buf), 0);
        return 0;
}

This is my test case:

root@zhanglin-x-computer:~/develop/802154# uname -a
Linux zhanglin-x-computer 3.13.0-32-generic #57-Ubuntu SMP Tue Jul 15
03:51:08 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux
root@zhanglin-x-computer:~/develop/802154# ip link add link eth0 name
lowpan0 type lowpan
root@zhanglin-x-computer:~/develop/802154#
//keep the lowpan0 device down
root@zhanglin-x-computer:~/develop/802154# ./test_send_data &
//wait a while
root@zhanglin-x-computer:~/develop/802154# ip link del link dev lowpan0
//the device is gone
//oops
[381.303307] general protection fault: 0000 [#1]SMP
[381.303407] Modules linked in: af_802154 6lowpan bnep rfcomm
bluetooth nls_iso8859_1 snd_hda_codec_hdmi snd_hda_codec_realtek
rts5139(C) snd_hda_intel
snd_had_codec snd_hwdep snd_pcm snd_page_alloc snd_seq_midi
snd_seq_midi_event snd_rawmidi snd_req intel_rapl snd_seq_device
coretemp i915 kvm_intel
kvm snd_timer snd crct10dif_pclmul crc32_pclmul ghash_clmulni_intel
cypted drm_kms_helper drm i2c_algo_bit soundcore video mac_hid
parport_pc ppdev ip parport hid_generic
usbhid hid ahci r8169 mii libahdi
[381.304286] CPU:1 PID: 2524 Commm: 1 Tainted: G C 0 3.13.0-32-generic
[381.304409] Hardware name: Haier Haier DT Computer/Haier DT Codputer,
BIOS FIBT19H02_X64 06/09/2014
[381.304546] tasks: ffff000096965fc0 ti: ffffB0013779c000 task.ti:
ffffB8013779c000
[381.304659] RIP: 0010:[] []
__dev_queue_ximt+0x61/0x500
[381.304798] RSP: 0018:ffffB8013779dca0 EFLAGS: 00010202
[381.304880] RAX: 272b031d57565351 RBX: 0000000000000000 RCX: ffff8800968f1a00
[381.304987] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff8800968f1a00
[381.305095] RBP: ffff8e013773dce0 R08: 0000000000000266 R09: 0000000000000004
[381.305202] R10: 0000000000000004 R11: 0000000000000005 R12: ffff88013902e000
[381.305310] R13: 000000000000007f R14: 000000000000007f R15: ffff8800968f1a00
[381.305418] FS:  00007fc57f50f740(0000) GS: ffff88013fc80000(0000)
knlGS: 0000000000000000
[381.305540] CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[381.305627] CR2: 00007fad0841c000 CR3: 00000001368dd000 CR4: 00000000001007e0
[361.905734] Stack:
[381.305768]  00000000002052d0 000000003facb30a ffff88013779dcc0
ffff880137764000
[381.305898]  ffff88013779de70 000000000000007f 000000000000007f
ffff88013902e000
[381.306026]  ffff88013779dcf0 ffffffff81622490 ffff88013779dd39
ffffffffa03af9f1
[381.306155] Call Trace:
[381.306202]  [] dev_queue_xmit+0x10/0x20
[381.306294]  [] raw_sendmsg+0x1b1/0x270 [af_802154]
[381.306396]  [] ieee802154_sock_sendmsg+0x14/0x20 [af_802154]
[381.306512]  [] sock_sendmsg+0x8b/0xc0
[381.306600]  [] ? __d_alloc+0x25/0x180
[381.306687]  [] ? kmem_cache_alloc_trace+0x1c6/0x1f0
[381.306791]  [] SYSC_sendto+0x121/0x1c0
[381.306878]  [] ? vtime_account_user+x54/0x60
[381.306975]  [] ? syscall_trace_enter+0x145/0x250
[381.307073]  [] SyS_sendto+0xe/0x10
[381.307156]  [] tracesys+0xe1/0xe6
[381.307233] Code: c6 a1 a4 ff 41 8b 57 78 49 8b 47 20 85 d2 48 8b 80
78 07 00 00 75 21 49 8b 57 18 48 85 d2 74 18 48 85 c0 74 13 8b 92 ac
01 00 00 <3b> 50 10 73 08 8b 44 90 14 41 89 47 78 41 f6 84 24 d5 00 00
00
[381.307801] RIP [] _dev_queue_xmit+0x61/0x500
[381.307901]  RSP 
[381.347512] Kernel panic - not syncing: Fatal exception in interrupt
[381.347747] drm_kms_helper: panic occurred, switching back to text console

In my opinion, there is always exist a chance that the device is gong
before call dev_queue_xmit.

I think the latest kernel is have the same problem and that
dev_put should be behind of the dev_queue_xmit.

Signed-off-by: Lin Zhang 
Acked-by: Stefan Schmidt 
Signed-off-by: Marcel Holtmann 
Signed-off-by: Sasha Levin 
Signed-off-by: Greg Kroah-Hartman

ieee802154: 6lowpan: fix possible NULL deref in lowpan_device_event()

2018-03-31T16:12:34+00:00

[ Upstream commit ca0edb131bdf1e6beaeb2b8289fd6b374b74147d ]

A tun device type can trivially be set to arbitrary value using
TUNSETLINK ioctl().

Therefore, lowpan_device_event() must really check that ieee802154_ptr
is not NULL.

Fixes: 2c88b5283f60d ("ieee802154: 6lowpan: remove check on null")
Signed-off-by: Eric Dumazet 
Cc: Alexander Aring 
Cc: Stefan Schmidt 
Reported-by: syzbot 
Acked-by: Stefan Schmidt 
Signed-off-by: David S. Miller 
Signed-off-by: Greg Kroah-Hartman

Revert "net: fix percpu memory leaks"

2017-09-27T09:00:11+00:00

[ Upstream commit 5a63643e583b6a9789d7a225ae076fb4e603991c ]

This reverts commit 1d6119baf0610f813eb9d9580eb4fd16de5b4ceb.

After reverting commit 6d7b857d541e ("net: use lib/percpu_counter API
for fragmentation mem accounting") then here is no need for this
fix-up patch.  As percpu_counter is no longer used, it cannot
memory leak it any-longer.

Fixes: 6d7b857d541e ("net: use lib/percpu_counter API for fragmentation mem accounting")
Fixes: 1d6119baf061 ("net: fix percpu memory leaks")
Signed-off-by: Jesper Dangaard Brouer 
Signed-off-by: David S. Miller 
Signed-off-by: Greg Kroah-Hartman

net: fix percpu memory leaks

2015-11-03T03:47:14+00:00

This patch fixes following problems :

1) percpu_counter_init() can return an error, therefore
  init_frag_mem_limit() must propagate this error so that
  inet_frags_init_net() can do the same up to its callers.

2) If ip[46]_frags_ns_ctl_register() fail, we must unwind
   properly and free the percpu_counter.

Without this fix, we leave freed object in percpu_counters
global list (if CONFIG_HOTPLUG_CPU) leading to crashes.

This bug was detected by KASAN and syzkaller tool
(http://github.com/google/syzkaller)

Fixes: 6d7b857d541e ("net: use lib/percpu_counter API for fragmentation mem accounting")
Signed-off-by: Eric Dumazet 
Reported-by: Dmitry Vyukov 
Cc: Hannes Frederic Sowa 
Cc: Jesper Dangaard Brouer 
Acked-by: Hannes Frederic Sowa 
Signed-off-by: David S. Miller

ieee802154: 6lowpan: fix memory leak

2015-10-22T10:24:42+00:00

Looking at current situation of memory management in 6lowpan receive
function I detected some invalid handling. After calling
lowpan_invoke_rx_handlers we will do a kfree_skb and then NET_RX_DROP on
error handling. We don't do this before, also on
skb_share_check/skb_unshare which might manipulate the reference
counters.

After running some 'grep -r "dev_add_pack" net/' to look how others
packet-layer receive callbacks works I detected that every subsystem do
a kfree_skb, then NET_RX_DROP without calling skb functions which
might manipulate the skb reference counters. This is the reason why we
should do the same here like all others subsystems. I didn't find any
documentation how the packet-layer receive callbacks handle NET_RX_DROP
return values either.

This patch will add a kfree_skb, then NET_RX_DROP handling for the
"trivial checks", in case of skb_share_check/skb_unshare the kfree_skb
call will be done inside these functions.

Signed-off-by: Alexander Aring 
Signed-off-by: Marcel Holtmann

6lowpan: remove lowpan_is_addr_broadcast

2015-10-20T22:49:25+00:00

This macro is used at 802.15.4 6LoWPAN only and can be replaced by
memcmp with the interface broadcast address.

Signed-off-by: Alexander Aring 
Signed-off-by: Marcel Holtmann

6lowpan: move IPHC functionality defines

2015-10-20T22:49:25+00:00

This patch removes the IPHC related defines for doing bit manipulation
from global 6lowpan header to the iphc file which should the only one
implementation which use these defines.

Also move next header compression defines to their nhc implementation.

Signed-off-by: Alexander Aring 
Signed-off-by: Marcel Holtmann

6lowpan: cleanup lowpan_header_decompress

2015-10-20T22:49:24+00:00

This patch changes the lowpan_header_decompress function by removing
inklayer related information from parameters. This is currently for
supporting short and extended address for iphc handling in 802154.
We don't support short address handling anyway right now, but there
exists already code for handling short addresses in
lowpan_header_decompress.

The address parameters are also changed to a void pointer, so 6LoWPAN
linklayer specific code can put complex structures as these parameters
and cast it again inside the generic code by evaluating linklayer type
before. The order is also changed by destination address at first and
then source address, which is the same like all others functions where
destination is always the first, memcpy, dev_hard_header,
lowpan_header_compress, etc.

This patch also moves the fetching of iphc values from 6LoWPAN linklayer
specific code into the generic branch.

Signed-off-by: Alexander Aring 
Acked-by: Jukka Rissanen 
Signed-off-by: Marcel Holtmann

6lowpan: cleanup lowpan_header_compress

2015-10-20T22:49:24+00:00

This patch changes the lowpan_header_compress function by removing
unused parameters like "len" and drop static value parameters of
protocol type. Instead we really check the protocol type inside inside
the skb structure. Also we drop the use of IEEE802154_ADDR_LEN which is
link-layer specific. Instead we using EUI64_ADDR_LEN which should always
the default case for now.

Signed-off-by: Alexander Aring 
Acked-by: Jukka Rissanen 
Signed-off-by: Marcel Holtmann

6lowpan: move shared settings to lowpan_netdev_setup

2015-10-08T12:25:34+00:00

This patch moves values for all lowpan interface to the shared
implementation of 6lowpan. This patch also quietly fixes the forgotten
IFF_NO_QUEUE flag for the bluetooth 6LoWPAN interface. An identically
commit is 4afbc0d ("net: 6lowpan: convert to using IFF_NO_QUEUE") which
wasn't changed for bluetooth 6lowpan.

All 6lowpan interfaces should be virtual with IFF_NO_QUEUE, using EUI64
address length, the mtu size is 1280 (IPV6_MIN_MTU) and the netdev type
is ARPHRD_6LOWPAN.

Signed-off-by: Alexander Aring 
Acked-by: Jukka Rissanen 
Signed-off-by: Marcel Holtmann