- Jun 07, 2023
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Johannes Berg authored
Sending the wiphy out might cause calls to the driver, notably get_txq_stats() and get_antenna(). These aren't very important, since the normally have their own locks and/or just send out static data, but if the contract should be that the wiphy lock is always held, these are also affected. Fix that. Signed-off-by:Johannes Berg <johannes.berg@intel.com>
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Johannes Berg authored
This is a driver callback, and the driver should be able to assume that it's called with the wiphy lock held. Move the call up so that's true, it has no other effect since the device is already unregistering and we cannot reach this function through other paths. Signed-off-by: -
Johannes Berg authored
Most code paths in cfg80211 already hold the wiphy lock, mostly by virtue of being called from nl80211, so make the pmsr cleanup worker also hold it, aligning the locking promises between different parts of cfg80211. Signed-off-by: -
Johannes Berg authored
Most code paths in cfg80211 already hold the wiphy lock, mostly by virtue of being called from nl80211, so make the auto-disconnect worker also hold it, aligning the locking promises between different parts of cfg80211. Signed-off-by:
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- Jun 06, 2023
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Johannes Berg authored
This should use wiphy_lock() now instead of acquiring the RTNL, since cfg80211_stop_sched_scan_req() now needs that. Fixes: a05829a7 ("cfg80211: avoid holding the RTNL when calling the driver") Signed-off-by:
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- Aug 25, 2022
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Johannes Berg authored
For AP/non-AP the EHT MCS/NSS subfield size differs, the 4-octet subfield is only used for 20 MHz-only non-AP STA. Pass an argument around everywhere to be able to parse it properly. Signed-off-by:
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- Jul 15, 2022
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Johannes Berg authored
This was missing earlier, we need to remove links when interfaces are being destroyed, and we also need to stop (AP) operations when a link is being destroyed. Address these issues to remove many warnings that will otherwise appear in mac80211. Signed-off-by:
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- Jul 01, 2022
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Veerendranath Jakkam authored
Increase akm_suites array size in struct cfg80211_crypto_settings to 10 and advertise the capability to userspace. This allows userspace to send more than two AKMs to driver in netlink commands such as NL80211_CMD_CONNECT. This capability is needed for implementing WPA3-Personal transition mode correctly with any driver that handles roaming internally. Currently, the possible AKMs for multi-AKM connect can include PSK, PSK-SHA-256, SAE, FT-PSK and FT-SAE. Since the count is already 5, increasing the akm_suites array size to 10 should be reasonable for future usecases. Signed-off-by:
Veerendranath Jakkam <quic_vjakkam@quicinc.com> Link: https://lore.kernel.org/r/1653312358-12321-1-git-send-email-quic_vjakkam@quicinc.com Signed-off-by:
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- Jun 20, 2022
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Johannes Berg authored
In order to support multi-link operation with multiple links, start adding some APIs. The notable addition here is to have the link ID in a new nl80211 attribute, that will be used to differentiate the links in many nl80211 operations. So far, this patch adds the netlink NL80211_ATTR_MLO_LINK_ID attribute (as well as the NL80211_ATTR_MLO_LINKS attribute) and plugs it through the system in some places, checking the validity etc. along with other infrastructure needed for it. For now, I've decided to include only the over-the-air link ID in the API. I know we discussed that we eventually need to have to have other ways of identifying a link, but for local AP mode and auth/assoc commands as well as set_key etc. we'll use the OTA ID. Also included in this patch is some refactoring of the data structures in struct wireless_dev, splitting for the first time the data into type dependent pieces, to make reasoning about these things easier. Signed-off-by:
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- Feb 04, 2022
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Johannes Berg authored
My previous fix here to fix the deadlock left a race where the exact same deadlock (see the original commit referenced below) can still happen if cfg80211_destroy_ifaces() already runs while nl80211_netlink_notify() is still marking some interfaces as nl_owner_dead. The race happens because we have two loops here - first we dev_close() all the netdevs, and then we destroy them. If we also have two netdevs (first one need only be a wdev though) then we can find one during the first iteration, close it, and go to the second iteration -- but then find two, and try to destroy also the one we didn't close yet. Fix this by only iterating once. Reported-by:
Toke Høiland-Jørgensen <toke@redhat.com> Fixes: ea6b2098 ("cfg80211: fix locking in netlink owner interface destruction") Tested-by:
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- Dec 20, 2021
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Sriram R authored
Currently cfg80211 checks for invalid channels whenever there is a regulatory update and stops the active interfaces if it is operating on an unsupported channel in the new regulatory domain. This is done based on a regulatory flag REGULATORY_IGNORE_STALE_KICKOFF set during wiphy registration which disables this enforcement when unsupported interface modes are supported by driver. Add support to enable this enforcement when Mesh Point interface type is advertised by drivers. Signed-off-by:
Sriram R <quic_srirrama@quicinc.com> Link: https://lore.kernel.org/r/1638409120-28997-1-git-send-email-quic_srirrama@quicinc.com Signed-off-by:
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Lorenzo Bianconi authored
ETSI standard defines "Offchannel CAC" as: "Off-Channel CAC is performed by a number of non-continuous checks spread over a period in time. This period, which is required to determine the presence of radar signals, is defined as the Off-Channel CAC Time.. Minimum Off-Channel CAC Time 6 minutes and Maximum Off-Channel CAC Time 4 hours..". mac80211 implementation refers to a dedicated hw chain used for continuous radar monitoring. Rename offchannel_* references to background_* in order to avoid confusion with ETSI standard. Signed-off-by:
Lorenzo Bianconi <lorenzo@kernel.org> Link: https://lore.kernel.org/r/4204cc1d648d76b44557981713231e030a3bd991.1638190762.git.lorenzo@kernel.org Signed-off-by:
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- Nov 19, 2021
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Lorenzo Bianconi authored
In order to make cfg80211_offchan_cac_abort() (renamed from cfg80211_offchan_cac_event) callable in other contexts and without so much locking restrictions, make it trigger a new work instead of operating directly. Do some other renames while at it to clarify. Signed-off-by:
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Lorenzo Bianconi authored
If a dedicated (off-channel) radar detection hardware (chain) is available in the hardware/driver, allow this to be used by calling the NL80211_CMD_RADAR_DETECT command with a new flag attribute requesting off-channel radar detection is used. Offchannel CAC (channel availability check) avoids the CAC downtime when switching to a radar channel or when turning on the AP. Drivers advertise support for this using the new feature flag NL80211_EXT_FEATURE_RADAR_OFFCHAN. Tested-by:
Evelyn Tsai <evelyn.tsai@mediatek.com> Signed-off-by:
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- Oct 25, 2021
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Johannes Berg authored
The management registrations locking was broken, the list was locked for each wdev, but cfg80211_mgmt_registrations_update() iterated it without holding all the correct spinlocks, causing list corruption. Rather than trying to fix it with fine-grained locking, just move the lock to the wiphy/rdev (still need the list on each wdev), we already need to hold the wdev lock to change it, so there's no contention on the lock in any case. This trivially fixes the bug since we hold one wdev's lock already, and now will hold the lock that protects all lists. Cc: stable@vger.kernel.org Reported-by:
Jouni Malinen <j@w1.fi> Fixes: 6cd536fe ("cfg80211: change internal management frame registration API") Link: https://lore.kernel.org/r/20211025133111.5cf733eab0f4.I7b0abb0494ab712f74e2efcd24bb31ac33f7eee9@changeid Signed-off-by:
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- Sep 27, 2021
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Johannes Berg authored
In the (somewhat unlikely) event that we allocate a wiphy, then add a regdomain to it, and then fail registration, we leak the regdomain. Fix this by just always freeing it at the end, in the normal cases we'll free (and NULL) it during wiphy_unregister(). This happened when the wiphy settings were bad, and since they can be controlled by userspace with hwsim, syzbot was able to find this issue. Reported-by:
<syzbot+1638e7c770eef6b6c0d0@syzkaller.appspotmail.com> Fixes: 3e0c3ff3 ("cfg80211: allow multiple driver regulatory_hints()") Signed-off-by:
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- Jun 23, 2021
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Miri Korenblit authored
We used to set regulatory info before the registration of the device and then the regulatory info didn't get set, because the device isn't registered so there isn't a device to set the regulatory info for. So set the regulatory info after the device registration. Call reg_process_self_managed_hints() once again after the device registration because it does nothing before it. Signed-off-by:
Miri Korenblit <miriam.rachel.korenblit@intel.com> Signed-off-by:
Luca Coelho <luciano.coelho@intel.com> Link: https://lore.kernel.org/r/iwlwifi.20210618133832.c96eadcffe80.I86799c2c866b5610b4cf91115c21d8ceb525c5aa@changeid Signed-off-by:
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Emmanuel Grumbach authored
This will allow the low level driver to query the rfkill state. Signed-off-by:
Emmanuel Grumbach <emmanuel.grumbach@intel.com> Link: https://lore.kernel.org/r/20210616202826.9833-1-emmanuel.grumbach@intel.com Signed-off-by:
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Johannes Berg authored
We no longer need to put any limits here, hardware will and mac80211-hwsim can do whatever it likes. The reason we had this was some accounting code (still mentioned in the comment) but that code was deleted in commit c781944b ("cfg80211: Remove unused cfg80211_can_use_iftype_chan()"). Link: https://lore.kernel.org/r/20210506221159.d1d61db1d31c.Iac4da68d54b9f1fdc18a03586bbe06aeb9515425@changeid Signed-off-by:
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- Jun 09, 2021
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Johannes Berg authored
When I moved around the code here, I neglected that we could still call register_netdev() or similar without the wiphy mutex held, which then calls cfg80211_register_wdev() - that's also done from cfg80211_register_netdevice(), but the phy80211 symlink creation was only there. Now, the symlink isn't needed for a *pure* wdev, but a netdev not registered via cfg80211_register_wdev() should still have the symlink, so move the creation to the right place. Cc: stable@vger.kernel.org Fixes: 2fe8ef10 ("cfg80211: change netdev registration/unregistration semantics") Link: https://lore.kernel.org/r/20210608113226.a5dc4c1e488c.Ia42fe663cefe47b0883af78c98f284c5555bbe5d@changeid Signed-off-by:
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- Apr 27, 2021
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Johannes Berg authored
Harald Arnesen reported [1] a deadlock at reboot time, and after he captured a stack trace a picture developed of what's going on: The distribution he's using is using iwd (not wpa_supplicant) to manage wireless. iwd will usually use the "socket owner" option when it creates new interfaces, so that they're automatically destroyed when it quits (unexpectedly or otherwise). This is also done by wpa_supplicant, but it doesn't do it for the normal one, only for additional ones, which is different with iwd. Anyway, during shutdown, iwd quits while the netdev is still UP, i.e. IFF_UP is set. This causes the stack trace that Linus so nicely transcribed from the pictures: cfg80211_destroy_iface_wk() takes wiphy_lock -> cfg80211_destroy_ifaces() ->ieee80211_del_iface ->ieeee80211_if_remove ->cfg80211_unregister_wdev ->unregister_netdevice_queue ->dev_close_many ->__dev_close_many ->raw_notifier_call_chain ->cfg80211_netdev_notifier_call and that last call tries to take wiphy_lock again. In commit a05829a7 ("cfg80211: avoid holding the RTNL when calling the driver") I had taken into account the possibility of recursing from cfg80211 into cfg80211_netdev_notifier_call() via the network stack, but only for NETDEV_UNREGISTER, not for what happens here, NETDEV_GOING_DOWN and NETDEV_DOWN notifications. Additionally, while this worked still back in commit 78f22b6a ("cfg80211: allow userspace to take ownership of interfaces"), it missed another corner case: unregistering a netdev will cause dev_close() to be called, and thus stop wireless operations (e.g. disconnecting), but there are some types of virtual interfaces in wifi that don't have a netdev - for that we need an additional call to cfg80211_leave(). So, to fix this mess, change cfg80211_destroy_ifaces() to not require the wiphy_lock(), but instead make it acquire it, but only after it has actually closed all the netdevs on the list, and then call cfg80211_leave() as well before removing them from the driver, to fix the second issue. The locking change in this requires modifying the nl80211 call to not get the wiphy lock passed in, but acquire it by itself after flushing any potentially pending destruction requests. [1] https://lore.kernel.org/r/09464e67-f3de-ac09-28a3-e27b7914ee7d@skogtun.org Cc: stable@vger.kernel.org # 5.12 Reported-by:Harald Arnesen <harald@skogtun.org> Fixes: 776a39b8 ("cfg80211: call cfg80211_destroy_ifaces() with wiphy lock held") Fixes: 78f22b6a ("cfg80211: allow userspace to take ownership of interfaces") Signed-off-by:
Linus Torvalds <torvalds@linux-foundation.org>
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- Apr 08, 2021
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Emmanuel Grumbach authored
rfkill now allows to report a reason for the hw_rfkill state. Allow cfg80211 drivers to specify this reason. Keep the current API to use the default reason (RFKILL_HARD_BLOCK_SIGNAL). Signed-off-by:
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- Apr 07, 2021
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Andrei Vagin authored
Here is only one place where we want to specify new_ifindex. In all other cases, callers pass 0 as new_ifindex. It looks reasonable to add a low-level function with new_ifindex and to convert dev_change_net_namespace to a static inline wrapper. Fixes: eeb85a14 ("net: Allow to specify ifindex when device is moved to another namespace") Suggested-by:
Jakub Kicinski <kuba@kernel.org> Signed-off-by:
Andrei Vagin <avagin@gmail.com> Acked-by:
David S. Miller <davem@davemloft.net>
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- Apr 05, 2021
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Andrei Vagin authored
Currently, we can specify ifindex on link creation. This change allows to specify ifindex when a device is moved to another network namespace. Even now, a device ifindex can be changed if there is another device with the same ifindex in the target namespace. So this change doesn't introduce completely new behavior, it adds more control to the process. CRIU users want to restore containers with pre-created network devices. A user will provide network devices and instructions where they have to be restored, then CRIU will restore network namespaces and move devices into them. The problem is that devices have to be restored with the same indexes that they have before C/R. Cc: Alexander Mikhalitsyn <alexander.mikhalitsyn@virtuozzo.com> Suggested-by:
Christian Brauner <christian.brauner@ubuntu.com> Signed-off-by:
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- Feb 01, 2021
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Johannes Berg authored
If register_netdevice() fails after having called cfg80211's netdev notifier (cfg80211_netdev_notifier_call) it will call the notifier again with UNREGISTER. This would then lock the wiphy mutex because we're marked as registered, which causes a deadlock. Fix this by separately keeping track of whether or not we're in the middle of registering to also skip the notifier call on this unregister. Reported-by:
<syzbot+2ae0ca9d7737ad1a62b7@syzkaller.appspotmail.com> Fixes: a05829a7 ("cfg80211: avoid holding the RTNL when calling the driver") Link: https://lore.kernel.org/r/20210201192048.ed8bad436737.I7cae042c44b15f80919a285799a15df467e9d42d@changeid Signed-off-by:
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- Jan 28, 2021
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Johannes Berg authored
This is needed since it calls into the driver, which must have the same context as if we got to destroy an interface through nl80211. Fix this, and add a direct lockdep assertion so we don't see it pop up only when the driver calls back to cfg80211. Fixes: a05829a7 ("cfg80211: avoid holding the RTNL when calling the driver") Reported-by:
<syzbot+4305e814f9b267131776@syzkaller.appspotmail.com> Link: https://lore.kernel.org/r/20210128183454.d31df9cbd7ce.I1beb07c9492f0ade900e864a098c57041e7a7ebf@changeid Signed-off-by:
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- Jan 26, 2021
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Johannes Berg authored
Currently, _everything_ in cfg80211 holds the RTNL, and if you have a slow USB device (or a few) you can get some bad lock contention on that. Fix that by re-adding a mutex to each wiphy/rdev as we had at some point, so we have locking for the wireless_dev lists and all the other things in there, and also so that drivers still don't have to worry too much about it (they still won't get parallel calls for a single device). Then, we can restrict the RTNL to a few cases where we add or remove interfaces and really need the added protection. Some of the global list management still also uses the RTNL, since we need to have it anyway for netdev management, but we only hold the RTNL for very short periods of time here. Link: https://lore.kernel.org/r/20210122161942.81df9f5e047a.I4a8e1a60b18863ea8c5e6d3a0faeafb2d45b2f40@changeid Tested-by: Marek Szyprowski <m.szyprowski@samsung.com> [marvell driver issues] Signed-off-by:
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- Jan 22, 2021
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Johannes Berg authored
We used to not require anything in terms of registering netdevs with cfg80211, using a netdev notifier instead. However, in the next patch reducing RTNL locking, this causes big problems, and the simplest way is to just require drivers to do things better. Change the registration/unregistration semantics to require the drivers to call cfg80211_(un)register_netdevice() when this is happening due to a cfg80211 request, i.e. add_virtual_intf() or del_virtual_intf() (or if it somehow has to happen in any other cfg80211 callback). Otherwise, in other contexts, drivers may continue to use the normal netdev (un)registration functions as usual. Internally, we still use the netdev notifier and track (by the new wdev->registered bool) if the wdev had already been added to cfg80211 or not. Link: https://lore.kernel.org/r/20210122161942.cf2f4b65e4e9.Ida8234e50da13eb675b557bac52a713ad4eddf71@changeid Signed-off-by:
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- Nov 11, 2020
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Johannes Berg authored
Remove all the code that was there to configure WDS interfaces, now that there's no way to reach it anymore. Link: https://lore.kernel.org/r/20201109105103.8f5b98e4068d.I5f5129041649ef2862b69683574bb3344743727b@changeid Signed-off-by:
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- Oct 30, 2020
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Johannes Berg authored
There's a race condition in the netdev registration in that NETDEV_REGISTER actually happens after the netdev is available, and so if we initialize things only there, we might get called with an uninitialized wdev through nl80211 - not using a wdev but using a netdev interface index. I found this while looking into a syzbot report, but it doesn't really seem to be related, and unfortunately there's no repro for it (yet). I can't (yet) explain how it managed to get into cfg80211_release_pmsr() from nl80211_netlink_notify() without the wdev having been initialized, as the latter only iterates the wdevs that are linked into the rdev, which even without the change here happened after init. However, looking at this, it seems fairly clear that the init needs to be done earlier, otherwise we might even re-init on a netns move, when data might still be pending. Signed-off-by:
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- Sep 28, 2020
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Tova Mussai authored
Support 6 GHz scanning, by * a new scan flag to scan for colocated BSSes advertised by (and found) APs on 2.4 & 5 GHz * doing the necessary reduced neighbor report parsing for this, to find them * adding the ability to split the scan request in case the device by itself cannot support this. Also add some necessary bits in mac80211 to not break with these changes. Signed-off-by:
Tova Mussai <tova.mussai@intel.com> Signed-off-by:
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- Aug 07, 2020
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Waiman Long authored
As said by Linus: A symmetric naming is only helpful if it implies symmetries in use. Otherwise it's actively misleading. In "kzalloc()", the z is meaningful and an important part of what the caller wants. In "kzfree()", the z is actively detrimental, because maybe in the future we really _might_ want to use that "memfill(0xdeadbeef)" or something. The "zero" part of the interface isn't even _relevant_. The main reason that kzfree() exists is to clear sensitive information that should not be leaked to other future users of the same memory objects. Rename kzfree() to kfree_sensitive() to follow the example of the recently added kvfree_sensitive() and make the intention of the API more explicit. In addition, memzero_explicit() is used to clear the memory to make sure that it won't get optimized away by the compiler. The renaming is done by using the command sequence: git grep -w --name-only kzfree |\ xargs sed -i 's/kzfree/kfree_sensitive/' followed by some editing of the kfree_sensitive() kerneldoc and adding a kzfree backward compatibility macro in slab.h. [akpm@linux-foundation.org: fs/crypto/inline_crypt.c needs linux/slab.h] [akpm@linux-foundation.org: fix fs/crypto/inline_crypt.c some more] Suggested-by:
Joe Perches <joe@perches.com> Signed-off-by:
Waiman Long <longman@redhat.com> Signed-off-by:
Andrew Morton <akpm@linux-foundation.org> Acked-by:
David Howells <dhowells@redhat.com> Acked-by:
Michal Hocko <mhocko@suse.com> Acked-by:
Johannes Weiner <hannes@cmpxchg.org> Cc: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com> Cc: James Morris <jmorris@namei.org> Cc: "Serge E. Hallyn" <serge@hallyn.com> Cc: Joe Perches <joe@perches.com> Cc: Matthew Wilcox <willy@infradead.org> Cc: David Rientjes <rientjes@google.com> Cc: Dan Carpenter <dan.carpenter@oracle.com> Cc: "Jason A . Donenfeld" <Jason@zx2c4.com> Link: http://lkml.kernel.org/r/20200616154311.12314-3-longman@redhat.com Signed-off-by:
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- Jul 31, 2020
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Thomas Pedersen authored
Gives drivers the definitions needed to advertise support for S1G bands. Signed-off-by:
Thomas Pedersen <thomas@adapt-ip.com> Link: https://lore.kernel.org/r/20200602062247.23212-1-thomas@adapt-ip.com Link: https://lore.kernel.org/r/20200731055636.795173-1-thomas@adapt-ip.com Signed-off-by:
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- Jun 05, 2020
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Johannes Berg authored
Lockdep reports that we may deadlock because we take the RTNL on the work struct, but flush it under RTNL. Clearly, it's correct. In practice, this can happen when doing rfkill on an active device. Fix this by moving the work struct to the wiphy (registered dev) layer, and iterate over all the wdevs inside there. This then means we need to track which one of them has work to do, so we don't update to the driver for all wdevs all the time. Also fix a locking bug I noticed while working on this - the registrations list is iterated as if it was an RCU list, but it isn't handle that way - and we need to lock now for the update flag anyway, so remove the RCU. Fixes: 6cd536fe ("cfg80211: change internal management frame registration API") Reported-by:
Markus Theil <markus.theil@tu-ilmenau.de> Reported-and-tested-by:
Kenneth R. Crudup <kenny@panix.com> Signed-off-by:
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- May 31, 2020
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Johannes Berg authored
On 6 GHz band, HE capabilities must be available for all of the interface types, otherwise we shouldn't use 6 GHz. Check this. Link: https://lore.kernel.org/r/20200528213443.5881cb3c8c4a.I583b54172f91f98d44af64a16c5826fe458cbb27@changeid Signed-off-by:
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Johannes Berg authored
On the 6 GHz band, HE should be used, but without any direct HT/VHT capabilities, instead the HE 6 GHz band capabilities will capture the relevant information. Reject HT/VHT capabilities here. Link: https://lore.kernel.org/r/20200528213443.bfe89c35459a.Ibba5e066fa0087fd49d13cfee89d196ea0c68ae2@changeid Signed-off-by:
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- May 25, 2020
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Johannes Berg authored
Removing the "if (IS_ERR(dir)) dir = NULL;" check only works if we adjust the remaining code to not rely on it being NULL. Check IS_ERR_OR_NULL() before attempting to dereference it. I'm not actually entirely sure this fixes the syzbot crash as the kernel config indicates that they do have DEBUG_FS in the kernel, but this is what I found when looking there. Cc: stable@vger.kernel.org Fixes: d82574a8 ("cfg80211: no need to check return value of debugfs_create functions") Reported-by:
<syzbot+fd5332e429401bf42d18@syzkaller.appspotmail.com> Reviewed-by:
Greg Kroah-Hartman <gregkh@linuxfoundation.org> Link: https://lore.kernel.org/r/20200525113816.fc4da3ec3d4b.Ica63a110679819eaa9fb3bc1b7437d96b1fd187d@changeid Signed-off-by:
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- Apr 24, 2020
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Johannes Berg authored
This should be covered by the next MHz, make sure that the numbers are always normalized. Signed-off-by:
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Johannes Berg authored
Almost all drivers below cfg80211 get the API wrong (except for cfg80211) and are unable to cope with multiple registrations for the same frame type, which is valid due to the match filter. This seems to indicate the API is wrong, and we should maintain the full information in cfg80211 instead of the drivers. Change the API to no longer inform the driver about individual registrations and unregistrations, but rather every time about the entire state of the entire wiphy and single wdev, whenever it may have changed. This also simplifies the code in cfg80211 as it no longer has to track exactly what was unregistered and can free things immediately. Signed-off-by:
Arend van Spriel <arend.vanspriel@broadcom.com> Reviewed-by:
Sergey Matyukevich <sergey.matyukevich.os@quantenna.com> Link: https://lore.kernel.org/r/20200417124300.f47f3828afc8.I7f81ef59c2c5a340d7075fb3c6d0e08e8aeffe07@changeid Signed-off-by:
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- Mar 20, 2020
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Avraham Stern authored
Add support for requesting that the ranging measurement will use the trigger-based / non trigger-based flow instead of the EDCA based flow. Signed-off-by:
Avraham Stern <avraham.stern@intel.com> Signed-off-by:
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