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  1. 01 Feb, 2022 2 commits
  3. 31 Jan, 2022 1 commit
    • Wen Gu's avatar
      net/smc: Forward wakeup to smc socket waitqueue after fallback · 341adeec
      Wen Gu authored 
      When we replace TCP with SMC and a fallback occurs, there may be
some socket waitqueue entries remaining in smc socket->wq, such
as eppoll_entries inserted by userspace applications.

After the fallback, data flows over TCP/IP and only clcsocket->wq
will be woken up. Applications can't be notified by the entries
which were inserted in smc socket->wq before fallback. So we need
a mechanism to wake up smc socket->wq at the same time if some
entries remaining in it.

The current workaround is to transfer the entries from smc socket->wq
to clcsock->wq during the fallback. But this may cause a crash
like this:

 general protection fault, probably for non-canonical address 0xdead000000000100: 0000 [#1] PREEMPT SMP PTI
 CPU: 3 PID: 0 Comm: swapper/3 Kdump: loaded Tainted: G E     5.16.0+ #107
 RIP: 0010:__wake_up_common+0x65/0x170
 Call Trace:
  <IRQ>
  __wake_up_common_lock+0x7a/0xc0
  sock_def_readable+0x3c/0x70
  tcp_data_queue+0x4a7/0xc40
  tcp_rcv_established+0x32f/0x660
  ? sk_filter_trim_cap+0xcb/0x2e0
  tcp_v4_do_rcv+0x10b/0x260
  tcp_v4_rcv+0xd2a/0xde0
  ip_protocol_deliver_rcu+0x3b/0x1d0
  ip_local_deliver_finish+0x54/0x60
  ip_local_deliver+0x6a/0x110
  ? tcp_v4_early_demux+0xa2/0x140
  ? tcp_v4_early_demux+0x10d/0x140
  ip_sublist_rcv_finish+0x49/0x60
  ip_sublist_rcv+0x19d/0x230
  ip_list_rcv+0x13e/0x170
  __netif_receive_skb_list_core+0x1c2/0x240
  netif_receive_skb_list_internal+0x1e6/0x320
  napi_complete_done+0x11d/0x190
  mlx5e_napi_poll+0x163/0x6b0 [mlx5_core]
  __napi_poll+0x3c/0x1b0
  net_rx_action+0x27c/0x300
  __do_softirq+0x114/0x2d2
  irq_exit_rcu+0xb4/0xe0
  common_interrupt+0xba/0xe0
  </IRQ>
  <TASK>

The crash is caused by privately transferring waitqueue entries from
smc socket->wq to clcsock->wq. The owners of these entries, such as
epoll, have no idea that the entries have been transferred to a
different socket wait queue and still use original waitqueue spinlock
(smc socket->wq.wait.lock) to make the entries operation exclusive,
but it doesn't work. The operations to the entries, such as removing
from the waitqueue (now is clcsock->wq after fallback), may cause a
crash when clcsock waitqueue is being iterated over at the moment.

This patch tries to fix this by no longer transferring wait queue
entries privately, but introducing own implementations of clcsock's
callback functions in fallback situation. The callback functions will
forward the wakeup to smc socket->wq if clcsock->wq is actually woken
up and smc socket->wq has remaining entries.

Fixes: 2153bd1e ("net/smc: Transfer remaining wait queue entries during fallback")
Suggested-by: default avatarKarsten Graul <kgraul@linux.ibm.com>
Signed-off-by: default avatarWen Gu <guwen@linux.alibaba.com>
Acked-by: default avatarKarsten Graul <kgraul@linux.ibm.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      341adeec
  5. 28 Jan, 2022 10 commits
    • Jisheng Zhang's avatar
      net: stmmac: properly handle with runtime pm in stmmac_dvr_remove() · 64495203
      Jisheng Zhang authored 
      There are two issues with runtime pm handling in stmmac_dvr_remove():

1. the mac is runtime suspended before stopping dma and rx/tx. We
need to ensure the device is properly resumed back.

2. the stmmaceth clk enable/disable isn't balanced in both exit and
error handling code path. Take the exit code path for example, when we
unbind the driver or rmmod the driver module, the mac is runtime
suspended as said above, so the stmmaceth clk is disabled, but
	stmmac_dvr_remove()
	  stmmac_remove_config_dt()
	    clk_disable_unprepare()
CCF will complain this time. The error handling code path suffers
from the similar situtaion.

Here are kernel warnings in error handling code path on Allwinner D1
platform:

[    1.604695] ------------[ cut here ]------------
[    1.609328] bus-emac already disabled
[    1.613015] WARNING: CPU: 0 PID: 38 at drivers/clk/clk.c:952 clk_core_disable+0xcc/0xec
[    1.621039] CPU: 0 PID: 38 Comm: kworker/u2:1 Not tainted 5.14.0-rc4#1
[    1.627653] Hardware name: Allwinner D1 NeZha (DT)
[    1.632443] Workqueue: events_unbound deferred_probe_work_func
[    1.638286] epc : clk_core_disable+0xcc/0xec
[    1.642561]  ra : clk_core_disable+0xcc/0xec
[    1.646835] epc : ffffffff8023c2ec ra : ffffffff8023c2ec sp : ffffffd00411bb10
[    1.654054]  gp : ffffffff80ec9988 tp : ffffffe00143a800 t0 : ffffffff80ed6a6f
[    1.661272]  t1 : ffffffff80ed6a60 t2 : 0000000000000000 s0 : ffffffe001509e00
[    1.668489]  s1 : 0000000000000001 a0 : 0000000000000019 a1 : ffffffff80e80bd8
[    1.675707]  a2 : 00000000ffffefff a3 : 00000000000000f4 a4 : 0000000000000002
[    1.682924]  a5 : 0000000000000001 a6 : 0000000000000030 a7 : 00000000028f5c29
[    1.690141]  s2 : 0000000000000800 s3 : ffffffe001375000 s4 : ffffffe01fdf7a80
[    1.697358]  s5 : ffffffe001375010 s6 : ffffffff8001fc10 s7 : ffffffffffffffff
[    1.704577]  s8 : 0000000000000001 s9 : ffffffff80ecb248 s10: ffffffe001b80000
[    1.711794]  s11: ffffffe001b80760 t3 : 0000000000000062 t4 : ffffffffffffffff
[    1.719012]  t5 : ffffffff80e0f6d8 t6 : ffffffd00411b8f0
[    1.724321] status: 8000000201800100 badaddr: 0000000000000000 cause: 0000000000000003
[    1.732233] [<ffffffff8023c2ec>] clk_core_disable+0xcc/0xec
[    1.737810] [<ffffffff80240430>] clk_disable+0x38/0x78
[    1.742956] [<ffffffff8001fc0c>] worker_thread+0x1a8/0x4d8
[    1.748451] [<ffffffff8031a500>] stmmac_remove_config_dt+0x1c/0x4c
[    1.754646] [<ffffffff8031c8ec>] sun8i_dwmac_probe+0x378/0x82c
[    1.760484] [<ffffffff8001fc0c>] worker_thread+0x1a8/0x4d8
[    1.765975] [<ffffffff8029a6c8>] platform_probe+0x64/0xf0
[    1.771382] [<ffffffff8029833c>] really_probe.part.0+0x8c/0x30c
[    1.777305] [<ffffffff8029865c>] __driver_probe_device+0xa0/0x148
[    1.783402] [<ffffffff8029873c>] driver_probe_device+0x38/0x138
[    1.789324] [<ffffffff802989cc>] __device_attach_driver+0xd0/0x170
[    1.795508] [<ffffffff802988f8>] __driver_attach_async_helper+0xbc/0xc0
[    1.802125] [<ffffffff802965ac>] bus_for_each_drv+0x68/0xb4
[    1.807701] [<ffffffff80298d1c>] __device_attach+0xd8/0x184
[    1.813277] [<ffffffff802967b0>] bus_probe_device+0x98/0xbc
[    1.818852] [<ffffffff80297904>] deferred_probe_work_func+0x90/0xd4
[    1.825122] [<ffffffff8001f8b8>] process_one_work+0x1e4/0x390
[    1.830872] [<ffffffff8001fd80>] worker_thread+0x31c/0x4d8
[    1.836362] [<ffffffff80026bf4>] kthreadd+0x94/0x188
[    1.841335] [<ffffffff80026bf4>] kthreadd+0x94/0x188
[    1.846304] [<ffffffff8001fa60>] process_one_work+0x38c/0x390
[    1.852054] [<ffffffff80026564>] kthread+0x124/0x160
[    1.857021] [<ffffffff8002643c>] set_kthread_struct+0x5c/0x60
[    1.862770] [<ffffffff80001f08>] ret_from_syscall_rejected+0x8/0xc
[    1.868956] ---[ end trace 8d5c6046255f84a0 ]---
[    1.873675] ------------[ cut here ]------------
[    1.878366] bus-emac already unprepared
[    1.882378] WARNING: CPU: 0 PID: 38 at drivers/clk/clk.c:810 clk_core_unprepare+0xe4/0x168
[    1.890673] CPU: 0 PID: 38 Comm: kworker/u2:1 Tainted: G        W	5.14.0-rc4 #1
[    1.898674] Hardware name: Allwinner D1 NeZha (DT)
[    1.903464] Workqueue: events_unbound deferred_probe_work_func
[    1.909305] epc : clk_core_unprepare+0xe4/0x168
[    1.913840]  ra : clk_core_unprepare+0xe4/0x168
[    1.918375] epc : ffffffff8023d6cc ra : ffffffff8023d6cc sp : ffffffd00411bb10
[    1.925593]  gp : ffffffff80ec9988 tp : ffffffe00143a800 t0 : 0000000000000002
[    1.932811]  t1 : ffffffe01f743be0 t2 : 0000000000000040 s0 : ffffffe001509e00
[    1.940029]  s1 : 0000000000000001 a0 : 000000000000001b a1 : ffffffe00143a800
[    1.947246]  a2 : 0000000000000000 a3 : 00000000000000f4 a4 : 0000000000000001
[    1.954463]  a5 : 0000000000000000 a6 : 0000000005fce2a5 a7 : 0000000000000001
[    1.961680]  s2 : 0000000000000800 s3 : ffffffff80afeb90 s4 : ffffffe01fdf7a80
[    1.968898]  s5 : ffffffe001375010 s6 : ffffffff8001fc10 s7 : ffffffffffffffff
[    1.976115]  s8 : 0000000000000001 s9 : ffffffff80ecb248 s10: ffffffe001b80000
[    1.983333]  s11: ffffffe001b80760 t3 : ffffffff80b39120 t4 : 0000000000000001
[    1.990550]  t5 : 0000000000000000 t6 : ffffffe001600002
[    1.995859] status: 8000000201800120 badaddr: 0000000000000000 cause: 0000000000000003
[    2.003771] [<ffffffff8023d6cc>] clk_core_unprepare+0xe4/0x168
[    2.009609] [<ffffffff802403a0>] clk_unprepare+0x24/0x3c
[    2.014929] [<ffffffff8031a508>] stmmac_remove_config_dt+0x24/0x4c
[    2.021125] [<ffffffff8031c8ec>] sun8i_dwmac_probe+0x378/0x82c
[    2.026965] [<ffffffff8001fc0c>] worker_thread+0x1a8/0x4d8
[    2.032463] [<ffffffff8029a6c8>] platform_probe+0x64/0xf0
[    2.037871] [<ffffffff8029833c>] really_probe.part.0+0x8c/0x30c
[    2.043795] [<ffffffff8029865c>] __driver_probe_device+0xa0/0x148
[    2.049892] [<ffffffff8029873c>] driver_probe_device+0x38/0x138
[    2.055815] [<ffffffff802989cc>] __device_attach_driver+0xd0/0x170
[    2.061999] [<ffffffff802988f8>] __driver_attach_async_helper+0xbc/0xc0
[    2.068616] [<ffffffff802965ac>] bus_for_each_drv+0x68/0xb4
[    2.074193] [<ffffffff80298d1c>] __device_attach+0xd8/0x184
[    2.079769] [<ffffffff802967b0>] bus_probe_device+0x98/0xbc
[    2.085345] [<ffffffff80297904>] deferred_probe_work_func+0x90/0xd4
[    2.091616] [<ffffffff8001f8b8>] process_one_work+0x1e4/0x390
[    2.097367] [<ffffffff8001fd80>] worker_thread+0x31c/0x4d8
[    2.102858] [<ffffffff80026bf4>] kthreadd+0x94/0x188
[    2.107830] [<ffffffff80026bf4>] kthreadd+0x94/0x188
[    2.112800] [<ffffffff8001fa60>] process_one_work+0x38c/0x390
[    2.118551] [<ffffffff80026564>] kthread+0x124/0x160
[    2.123520] [<ffffffff8002643c>] set_kthread_struct+0x5c/0x60
[    2.129268] [<ffffffff80001f08>] ret_from_syscall_rejected+0x8/0xc
[    2.135455] ---[ end trace 8d5c6046255f84a1 ]---

Fixes: 5ec55823 ("net: stmmac: add clocks management for gmac driver")
Signed-off-by: default avatarJisheng Zhang <jszhang@kernel.org>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      64495203
    • David S. Miller's avatar
      Merge tag 'ieee802154-for-net-2022-01-28' of... · 010a2a66
      David S. Miller authored 
      Merge tag 'ieee802154-for-net-2022-01-28' of git://git.kernel.org/pub/scm/linux/kernel/git/sschmidt/wpan

Stefan Schmidt says:

====================
pull-request: ieee802154 for net 2022-01-28

An update from ieee802154 for your *net* tree.

A bunch of fixes in drivers, all from Miquel Raynal.
Clarifying the default channel in hwsim, leak fixes in at86rf230 and ca8210 as
well as a symbol duration fix for mcr20a. Topping up the driver fixes with
better error codes in nl802154 and a cleanup in MAINTAINERS for an orphaned
driver.
====================
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      010a2a66
    • Haiyue Wang's avatar
      gve: fix the wrong AdminQ buffer queue index check · 1f84a945
      Haiyue Wang authored 
      The 'tail' and 'head' are 'unsigned int' type free-running count, when
'head' is overflow, the 'int i (= tail) < u32 head' will be false:

Only '- loop 0: idx = 63' result is shown, so it needs to use 'int' type
to compare, it can handle the overflow correctly.

typedef uint32_t u32;

int main()
{
        u32 tail, head;
        int stail, shead;
        int i, loop;

        tail = 0xffffffff;
        head = 0x00000000;

        for (i = tail, loop = 0; i < head; i++) {
                unsigned int idx = i & 63;

                printf("+ loop %d: idx = %u\n", loop++, idx);
        }

        stail = tail;
        shead = head;
        for (i = stail, loop = 0; i < shead; i++) {
                unsigned int idx = i & 63;

                printf("- loop %d: idx = %u\n", loop++, idx);
        }

        return 0;
}

Fixes: 5cdad90d ("gve: Batch AQ commands for creating and destroying queues.")
Signed-off-by: default avatarHaiyue Wang <haiyue.wang@intel.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      1f84a945
    • David S. Miller's avatar
      Merge branch 'ax25-fixes' · 501c8f5e
      David S. Miller authored 
      Duoming Zhou says:

====================
ax25: fix NPD and UAF bugs when detaching ax25 device

There are NPD and UAF bugs when detaching ax25 device, we
use lock and refcount to mitigate these bugs.
====================
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      501c8f5e
    • Duoming Zhou's avatar
      ax25: add refcount in ax25_dev to avoid UAF bugs · d01ffb9e
      Duoming Zhou authored 
      If we dereference ax25_dev after we call kfree(ax25_dev) in
ax25_dev_device_down(), it will lead to concurrency UAF bugs.
There are eight syscall functions suffer from UAF bugs, include
ax25_bind(), ax25_release(), ax25_connect(), ax25_ioctl(),
ax25_getname(), ax25_sendmsg(), ax25_getsockopt() and
ax25_info_show().

One of the concurrency UAF can be shown as below:

  (USE)                       |    (FREE)
                              |  ax25_device_event
                              |    ax25_dev_device_down
ax25_bind                     |    ...
  ...                         |      kfree(ax25_dev)
  ax25_fillin_cb()            |    ...
    ax25_fillin_cb_from_dev() |
  ...                         |

The root cause of UAF bugs is that kfree(ax25_dev) in
ax25_dev_device_down() is not protected by any locks.
When ax25_dev, which there are still pointers point to,
is released, the concurrency UAF bug will happen.

This patch introduces refcount into ax25_dev in order to
guarantee that there are no pointers point to it when ax25_dev
is released.
Signed-off-by: default avatarDuoming Zhou <duoming@zju.edu.cn>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      d01ffb9e
    • Duoming Zhou's avatar
      ax25: improve the incomplete fix to avoid UAF and NPD bugs · 4e0f718d
      Duoming Zhou authored 
      The previous commit 1ade48d0 ("ax25: NPD bug when detaching
AX25 device") introduce lock_sock() into ax25_kill_by_device to
prevent NPD bug. But the concurrency NPD or UAF bug will occur,
when lock_sock() or release_sock() dereferences the ax25_cb->sock.

The NULL pointer dereference bug can be shown as below:

ax25_kill_by_device()        | ax25_release()
                             |   ax25_destroy_socket()
                             |     ax25_cb_del()
  ...                        |     ...
                             |     ax25->sk=NULL;
  lock_sock(s->sk); //(1)    |
  s->ax25_dev = NULL;        |     ...
  release_sock(s->sk); //(2) |
  ...                        |

The root cause is that the sock is set to null before dereference
site (1) or (2). Therefore, this patch extracts the ax25_cb->sock
in advance, and uses ax25_list_lock to protect it, which can synchronize
with ax25_cb_del() and ensure the value of sock is not null before
dereference sites.

The concurrency UAF bug can be shown as below:

ax25_kill_by_device()        | ax25_release()
                             |   ax25_destroy_socket()
  ...                        |   ...
                             |   sock_put(sk); //FREE
  lock_sock(s->sk); //(1)    |
  s->ax25_dev = NULL;        |   ...
  release_sock(s->sk); //(2) |
  ...                        |

The root cause is that the sock is released before dereference
site (1) or (2). Therefore, this patch uses sock_hold() to increase
the refcount of sock and uses ax25_list_lock to protect it, which
can synchronize with ax25_cb_del() in ax25_destroy_socket() and
ensure the sock wil not be released before dereference sites.
Signed-off-by: default avatarDuoming Zhou <duoming@zju.edu.cn>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      4e0f718d
    • Yuji Ishikawa's avatar
      net: stmmac: dwmac-visconti: No change to ETHER_CLOCK_SEL for unexpected speed request. · 928d6fe9
      Yuji Ishikawa authored 
      Variable clk_sel_val is not initialized in the default case of the first switch statement.
In that case, the function should return immediately without any changes to the hardware.
Reported-by: default avatarkernel test robot <lkp@intel.com>
Reported-by: default avatarDan Carpenter <dan.carpenter@oracle.com>
Fixes: b38dd98f ("net: stmmac: Add Toshiba Visconti SoCs glue driver")
Signed-off-by: default avatarYuji Ishikawa <yuji2.ishikawa@toshiba.co.jp>
Reviewed-by: default avatarNobuhiro Iwamatsu <nobuhiro1.iwamatsu@toshiba.co.jp>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      928d6fe9
    • Raju Rangoju's avatar
      net: amd-xgbe: ensure to reset the tx_timer_active flag · 7674b7b5
      Raju Rangoju authored 
      Ensure to reset the tx_timer_active flag in xgbe_stop(),
otherwise a port restart may result in tx timeout due to
uncleared flag.

Fixes: c635eaac ("amd-xgbe: Remove Tx coalescing")
Co-developed-by: default avatarSudheesh Mavila <sudheesh.mavila@amd.com>
Signed-off-by: default avatarSudheesh Mavila <sudheesh.mavila@amd.com>
Signed-off-by: default avatarRaju Rangoju <Raju.Rangoju@amd.com>
Acked-by: default avatarTom Lendacky <thomas.lendacky@amd.com>
Link: https://lore.kernel.org/r/20220127060222.453371-1-Raju.Rangoju@amd.comSigned-off-by: default avatarJakub Kicinski <kuba@kernel.org>
      7674b7b5
    • Jakub Kicinski's avatar
      Merge git://git.kernel.org/pub/scm/linux/kernel/git/pablo/nf · 33d12dc9
      Jakub Kicinski authored 
      Pablo Neira Ayuso says:

====================
Netfilter fixes for net

1) Remove leftovers from flowtable modules, from Geert Uytterhoeven.

2) Missing refcount increment of conntrack template in nft_ct,
   from Florian Westphal.

3) Reduce nft_zone selftest time, also from Florian.

4) Add selftest to cover stateless NAT on fragments, from Florian Westphal.

5) Do not set net_device when for reject packets from the bridge path,
   from Phil Sutter.

6) Cancel register tracking info on nft_byteorder operations.

7) Extend nft_concat_range selftest to cover set reload with no elements,
   from Florian Westphal.

8) Remove useless update of pointer in chain blob builder, reported
   by kbuild test robot.

* git://git.kernel.org/pub/scm/linux/kernel/git/pablo/nf:
  netfilter: nf_tables: remove assignment with no effect in chain blob builder
  selftests: nft_concat_range: add test for reload with no element add/del
  netfilter: nft_byteorder: track register operations
  netfilter: nft_reject_bridge: Fix for missing reply from prerouting
  selftests: netfilter: check stateless nat udp checksum fixup
  selftests: netfilter: reduce zone stress test running time
  netfilter: nft_ct: fix use after free when attaching zone template
  netfilter: Remove flowtable relics
====================

Link: https://lore.kernel.org/r/20220127235235.656931-1-pablo@netfilter.orgSigned-off-by: default avatarJakub Kicinski <kuba@kernel.org>
      33d12dc9
    • Shyam Sundar S K's avatar
      net: amd-xgbe: Fix skb data length underflow · 5aac9108
      Shyam Sundar S K authored 
      There will be BUG_ON() triggered in include/linux/skbuff.h leading to
intermittent kernel panic, when the skb length underflow is detected.

Fix this by dropping the packet if such length underflows are seen
because of inconsistencies in the hardware descriptors.

Fixes: 622c36f1 ("amd-xgbe: Fix jumbo MTU processing on newer hardware")
Suggested-by: default avatarTom Lendacky <thomas.lendacky@amd.com>
Signed-off-by: default avatarShyam Sundar S K <Shyam-sundar.S-k@amd.com>
Acked-by: default avatarTom Lendacky <thomas.lendacky@amd.com>
Link: https://lore.kernel.org/r/20220127092003.2812745-1-Shyam-sundar.S-k@amd.comSigned-off-by: default avatarJakub Kicinski <kuba@kernel.org>
      5aac9108
  7. 27 Jan, 2022 27 commits
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