Skip to content

L
linux
Switch branch/tag
  1. 01 Sep, 2022 7 commits
  3. 31 Aug, 2022 11 commits
  5. 30 Aug, 2022 2 commits
  7. 29 Aug, 2022 5 commits
    • David S. Miller's avatar
      Merge branch 'u64_stats-fixups' · cb10b0f9
      David S. Miller authored 
      Sebastian Andrzej Siewior says:

====================
net: u64_stats fixups for 32bit.

while looking at the u64-stats patch
	https://lore.kernel.org/all/20220817162703.728679-10-bigeasy@linutronix.de

I noticed that u64_stats_fetch_begin() is used. That suspicious thing
about it is that network processing, including stats update, is
performed in NAPI and so I would expect to see
u64_stats_fetch_begin_irq() in order to avoid updates from NAPI during
the read. This is only needed on 32bit-UP where the seqcount is not
used. This is address in 2/2. The remaining user take some kind of
precaution and may use u64_stats_fetch_begin().

I updated the previously mentioned patch to get rid of
u64_stats_fetch_begin_irq(). If this is not considered stable patch
worthy then it can be ignored and considred fixed by the other series
which removes the special 32bit cases.

The xrs700x driver reads and writes the counter from preemptible context
so the only missing piece here is at least disable preemption on the
writer side to avoid preemption while the writer is in progress. The
possible reader would spin then until the writer completes its write
critical section which is considered bad. This is addressed in 1/2 by
using u64_stats_update_begin_irqsave() and so disable interrupts during
the write critical section.
The other closet resemblance I found is mdio_bus.c::mdiobus_stats_acct()
where preemtion is disabled unconditionally. This is something I want to
avoid since it also affects 64bit.
====================
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      cb10b0f9
    • Sebastian Andrzej Siewior's avatar
      net: Use u64_stats_fetch_begin_irq() for stats fetch. · 278d3ba6
      Sebastian Andrzej Siewior authored 
      On 32bit-UP u64_stats_fetch_begin() disables only preemption. If the
reader is in preemptible context and the writer side
(u64_stats_update_begin*()) runs in an interrupt context (IRQ or
softirq) then the writer can update the stats during the read operation.
This update remains undetected.

Use u64_stats_fetch_begin_irq() to ensure the stats fetch on 32bit-UP
are not interrupted by a writer. 32bit-SMP remains unaffected by this
change.

Cc: "David S. Miller" <davem@davemloft.net>
Cc: Catherine Sullivan <csully@google.com>
Cc: David Awogbemila <awogbemila@google.com>
Cc: Dimitris Michailidis <dmichail@fungible.com>
Cc: Eric Dumazet <edumazet@google.com>
Cc: Hans Ulli Kroll <ulli.kroll@googlemail.com>
Cc: Jakub Kicinski <kuba@kernel.org>
Cc: Jeroen de Borst <jeroendb@google.com>
Cc: Johannes Berg <johannes@sipsolutions.net>
Cc: Linus Walleij <linus.walleij@linaro.org>
Cc: Paolo Abeni <pabeni@redhat.com>
Cc: Simon Horman <simon.horman@corigine.com>
Cc: linux-arm-kernel@lists.infradead.org
Cc: linux-wireless@vger.kernel.org
Cc: netdev@vger.kernel.org
Cc: oss-drivers@corigine.com
Cc: stable@vger.kernel.org
Signed-off-by: default avatarSebastian Andrzej Siewior <bigeasy@linutronix.de>
Reviewed-by: default avatarSimon Horman <simon.horman@corigine.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      278d3ba6
    • Sebastian Andrzej Siewior's avatar
      net: dsa: xrs700x: Use irqsave variant for u64 stats update · 3f8ae9fe
      Sebastian Andrzej Siewior authored 
      xrs700x_read_port_counters() updates the stats from a worker using the
u64_stats_update_begin() version. This is okay on 32-UP since on the
reader side preemption is disabled.
On 32bit-SMP the writer can be preempted by the reader at which point
the reader will spin on the seqcount until writer continues and
completes the update.

Assigning the mib_mutex mutex to the underlying seqcount would ensure
proper synchronisation. The API for that on the u64_stats_init() side
isn't available. Since it is the only user, just use disable interrupts
during the update.

Use u64_stats_update_begin_irqsave() on the writer side to ensure an
uninterrupted update.

Fixes: ee00b24f ("net: dsa: add Arrow SpeedChips XRS700x driver")
Cc: Andrew Lunn <andrew@lunn.ch>
Cc: Florian Fainelli <f.fainelli@gmail.com>
Cc: George McCollister <george.mccollister@gmail.com>
Cc: Vivien Didelot <vivien.didelot@gmail.com>
Cc: Vladimir Oltean <olteanv@gmail.com>
Signed-off-by: default avatarSebastian Andrzej Siewior <bigeasy@linutronix.de>
Acked-by: default avatarGeorge McCollister <george.mccollister@gmail.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      3f8ae9fe
    • Li Qiong's avatar
      ieee802154: cc2520: add rc code in cc2520_tx() · ffd7bddd
      Li Qiong authored 
      The rc code is 0 at the error path "status & CC2520_STATUS_TX_UNDERFLOW".
Assign rc code with '-EINVAL' at this error path to fix it.
Signed-off-by: default avatarLi Qiong <liqiong@nfschina.com>
Link: https://lore.kernel.org/r/20220829071259.18330-1-liqiong@nfschina.comSigned-off-by: default avatarStefan Schmidt <stefan@datenfreihafen.org>
      ffd7bddd
    • Miquel Raynal's avatar
      net: mac802154: Fix a condition in the receive path · f0da4711
      Miquel Raynal authored 
      Upon reception, a packet must be categorized, either it's destination is
the host, or it is another host. A packet with no destination addressing
fields may be valid in two situations:
- the packet has no source field: only ACKs are built like that, we
  consider the host as the destination.
- the packet has a valid source field: it is directed to the PAN
  coordinator, as for know we don't have this information we consider we
  are not the PAN coordinator.

There was likely a copy/paste error made during a previous cleanup
because the if clause is now containing exactly the same condition as in
the switch case, which can never be true. In the past the destination
address was used in the switch and the source address was used in the
if, which matches what the spec says.

Cc: stable@vger.kernel.org
Fixes: ae531b94 ("ieee802154: use ieee802154_addr instead of *_sa variants")
Signed-off-by: default avatarMiquel Raynal <miquel.raynal@bootlin.com>
Link: https://lore.kernel.org/r/20220826142954.254853-1-miquel.raynal@bootlin.comSigned-off-by: default avatarStefan Schmidt <stefan@datenfreihafen.org>
      f0da4711
  9. 27 Aug, 2022 7 commits
  11. 26 Aug, 2022 2 commits
    • David S. Miller's avatar
      Merge git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf · 2e085ec0
      David S. Miller authored 
      Daniel borkmann says:

====================
The following pull-request contains BPF updates for your *net* tree.

We've added 11 non-merge commits during the last 14 day(s) which contain
a total of 13 files changed, 61 insertions(+), 24 deletions(-).

The main changes are:

1) Fix BPF verifier's precision tracking around BPF ring buffer, from Kumar Kartikeya Dwivedi.

2) Fix regression in tunnel key infra when passing FLOWI_FLAG_ANYSRC, from Eyal Birger.

3) Fix insufficient permissions for bpf_sys_bpf() helper, from YiFei Zhu.

4) Fix splat from hitting BUG when purging effective cgroup programs, from Pu Lehui.

5) Fix range tracking for array poke descriptors, from Daniel Borkmann.

6) Fix corrupted packets for XDP_SHARED_UMEM in aligned mode, from Magnus Karlsson.

7) Fix NULL pointer splat in BPF sockmap sk_msg_recvmsg(), from Liu Jian.

8) Add READ_ONCE() to bpf_jit_limit when reading from sysctl, from Kuniyuki Iwashima.

9) Add BPF selftest lru_bug check to s390x deny list, from Daniel Müller.
====================
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      2e085ec0
    • David S. Miller's avatar
      Merge tag 'wireless-2022-08-26' of git://git.kernel.org/pub/scm/linux/kernel/git/wireless/wireless · 4ba9d38b
      David S. Miller authored 
      Johannes Berg says:

====================
pull-request: wireless-2022-08-26

Here are a couple of fixes for the current cycle,
see the tag description below.

Just a couple of fixes:
 * two potential leaks
 * use-after-free in certain scan races
 * warning in IBSS code
 * error return from a debugfs file was wrong
 * possible NULL-ptr-deref when station lookup fails

Please pull and let me know if there's any problem.
====================
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      4ba9d38b
  13. 25 Aug, 2022 6 commits
GitLab Nexedi Edition | About GitLab | About Nexedi | 沪ICP备2021021310号-2 | 沪ICP备2021021310号-7