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  1. 06 Apr, 2021 8 commits
  3. 05 Apr, 2021 6 commits
  5. 02 Apr, 2021 3 commits
  7. 01 Apr, 2021 17 commits
  9. 31 Mar, 2021 6 commits
    • Ong Boon Leong's avatar
      xdp: fix xdp_return_frame() kernel BUG throw for page_pool memory model · 622d1369
      Ong Boon Leong authored 
      xdp_return_frame() may be called outside of NAPI context to return
xdpf back to page_pool. xdp_return_frame() calls __xdp_return() with
napi_direct = false. For page_pool memory model, __xdp_return() calls
xdp_return_frame_no_direct() unconditionally and below false negative
kernel BUG throw happened under preempt-rt build:

[  430.450355] BUG: using smp_processor_id() in preemptible [00000000] code: modprobe/3884
[  430.451678] caller is __xdp_return+0x1ff/0x2e0
[  430.452111] CPU: 0 PID: 3884 Comm: modprobe Tainted: G     U      E     5.12.0-rc2+ #45

Changes in v2:
 - This patch fixes the issue by making xdp_return_frame_no_direct() is
   only called if napi_direct = true, as recommended for better by
   Jesper Dangaard Brouer. Thanks!

Fixes: 2539650f ("xdp: Helpers for disabling napi_direct of xdp_return_frame")
Signed-off-by: default avatarOng Boon Leong <boon.leong.ong@intel.com>
Acked-by: default avatarJesper Dangaard Brouer <brouer@redhat.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      622d1369
    • Eric Dumazet's avatar
      Revert "net: correct sk_acceptq_is_full()" · c609e6aa
      Eric Dumazet authored 
      This reverts commit f211ac15.

We had similar attempt in the past, and we reverted it.

History:

64a14651 [NET]: Revert incorrect accept queue backlog changes.
8488df89 [NET]: Fix bugs in "Whether sock accept queue is full" checking

I am adding a fat comment so that future attempts will
be much harder.

Fixes: f211ac15 ("net: correct sk_acceptq_is_full()")
Cc: iuyacan <yacanliu@163.com>
Signed-off-by: default avatarEric Dumazet <edumazet@google.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      c609e6aa
    • David S. Miller's avatar
      Merge tag 'mlx5-fixes-2021-03-31' of git://git.kernel.org/pub/scm/linux/kernel/git/saeed/linux · 9dc22c0d
      David S. Miller authored 
      Saeed Mahameed says:

====================
mlx5 fixes 2021-03-31

This series introduces some fixes to mlx5 driver.
Please pull and let me know if there is any problem.
====================
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      9dc22c0d
    • David S. Miller's avatar
      Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/klassert/ipsec · c9170f13
      David S. Miller authored 
      Steffen Klassert says:

====================
pull request (net): ipsec 2021-03-31

1) Fix ipv4 pmtu checks for xfrm anf vti interfaces.
   From Eyal Birger.

2) There are situations where the socket passed to
   xfrm_output_resume() is not the same as the one
   attached to the skb. Use the socket passed to
   xfrm_output_resume() to avoid lookup failures
   when xfrm is used with VRFs.
   From Evan Nimmo.

3) Make the xfrm_state_hash_generation sequence counter per
   network namespace because but its write serialization
   lock is also per network namespace. Write protection
   is insufficient otherwise.
   From Ahmed S. Darwish.

4) Fixup sctp featue flags when used with esp offload.
   From Xin Long.

5) xfrm BEET mode doesn't support fragments for inner packets.
   This is a limitation of the protocol, so no fix possible.
   Warn at least to notify the user about that situation.
   From Xin Long.

6) Fix NULL pointer dereference on policy lookup when
   namespaces are uses in combination with esp offload.

7) Fix incorrect transformation on esp offload when
   packets get segmented at layer 3.

8) Fix some user triggered usages of WARN_ONCE in
   the xfrm compat layer.
   From Dmitry Safonov.

Please pull or let me know if there are problems.
====================
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      c9170f13
    • Lv Yunlong's avatar
      net/rds: Fix a use after free in rds_message_map_pages · bdc2ab5c
      Lv Yunlong authored 
      In rds_message_map_pages, the rm is freed by rds_message_put(rm).
But rm is still used by rm->data.op_sg in return value.

My patch assigns ERR_CAST(rm->data.op_sg) to err before the rm is
freed to avoid the uaf.

Fixes: 7dba9203 ("net/rds: Use ERR_PTR for rds_message_alloc_sgs()")
Signed-off-by: default avatarLv Yunlong <lyl2019@mail.ustc.edu.cn>
Reviewed-by: default avatarHåkon Bugge <haakon.bugge@oracle.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      bdc2ab5c
    • Tong Zhu's avatar
      neighbour: Disregard DEAD dst in neigh_update · d47ec7a0
      Tong Zhu authored 
      After a short network outage, the dst_entry is timed out and put
in DST_OBSOLETE_DEAD. We are in this code because arp reply comes
from this neighbour after network recovers. There is a potential
race condition that dst_entry is still in DST_OBSOLETE_DEAD.
With that, another neighbour lookup causes more harm than good.

In best case all packets in arp_queue are lost. This is
counterproductive to the original goal of finding a better path
for those packets.

I observed a worst case with 4.x kernel where a dst_entry in
DST_OBSOLETE_DEAD state is associated with loopback net_device.
It leads to an ethernet header with all zero addresses.
A packet with all zero source MAC address is quite deadly with
mac80211, ath9k and 802.11 block ack.  It fails
ieee80211_find_sta_by_ifaddr in ath9k (xmit.c). Ath9k flushes tx
queue (ath_tx_complete_aggr). BAW (block ack window) is not
updated. BAW logic is damaged and ath9k transmission is disabled.
Signed-off-by: default avatarTong Zhu <zhutong@amazon.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      d47ec7a0
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