- 30 Jun, 2020 40 commits
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Guillaume Nault authored
BugLink: https://bugs.launchpad.net/bugs/1883916 commit af87ae46 upstream. There's no point in checking for duplicate sessions at the beginning of l2tp_nl_cmd_session_create(); the ->session_create() callbacks already return -EEXIST when the session already exists. Furthermore, even if l2tp_session_find() returns NULL, a new session might be created right after the test. So relying on ->session_create() to avoid duplicate session is the only sane behaviour. Signed-off-by:
Guillaume Nault <g.nault@alphalink.fr> Signed-off-by:
David S. Miller <davem@davemloft.net> Signed-off-by:
Giuliano Procida <gprocida@google.com> Signed-off-by:
Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by:
Kamal Mostafa <kamal@canonical.com> Signed-off-by:
Khalid Elmously <khalid.elmously@canonical.com>
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R. Parameswaran authored
BugLink: https://bugs.launchpad.net/bugs/1883916 commit b784e7eb upstream. Existing L2TP kernel code does not derive the optimal MTU for Ethernet pseudowires and instead leaves this to a userspace L2TP daemon or operator. If an MTU is not specified, the existing kernel code chooses an MTU that does not take account of all tunnel header overheads, which can lead to unwanted IP fragmentation. When L2TP is used without a control plane (userspace daemon), we would prefer that the kernel does a better job of choosing a default pseudowire MTU, taking account of all tunnel header overheads, including IP header options, if any. This patch addresses this. Change-set here uses the new kernel function, kernel_sock_ip_overhead(), to factor the outer IP overhead on the L2TP tunnel socket (including IP Options, if any) when calculating the default MTU for an Ethernet pseudowire, along with consideration of the inner Ethernet header. Signed-off-by:
R. Parameswaran <rparames@brocade.com> Signed-off-by:
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R. Parameswaran authored
BugLink: https://bugs.launchpad.net/bugs/1883916 commit 113c3075 upstream. A new function, kernel_sock_ip_overhead(), is provided to calculate the cumulative overhead imposed by the IP Header and IP options, if any, on a socket's payload. The new function returns an overhead of zero for sockets that do not belong to the IPv4 or IPv6 address families. This is used in the L2TP code path to compute the total outer IP overhead on the L2TP tunnel socket when calculating the default MTU for Ethernet pseudowires. Signed-off-by:
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Asbjørn Sloth Tønnesen authored
BugLink: https://bugs.launchpad.net/bugs/1883916 commit fba40c63 upstream. Signed-off-by:
Asbjoern Sloth Toennesen <asbjorn@asbjorn.st> Signed-off-by:
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Asbjørn Sloth Tønnesen authored
BugLink: https://bugs.launchpad.net/bugs/1883916 commit 47c3e778 upstream. PPPOL2TP_MSG_* and L2TP_MSG_* are duplicates, and are being used interchangeably in the kernel, so let's standardize on L2TP_MSG_* internally, and keep PPPOL2TP_MSG_* defined in UAPI for compatibility. Signed-off-by:
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Asbjørn Sloth Tønnesen authored
BugLink: https://bugs.launchpad.net/bugs/1883916 commit 41c43fbe upstream. Move the L2TP_MSG_* definitions to UAPI, as it is part of the netlink API. Signed-off-by:
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Guillaume Nault authored
BugLink: https://bugs.launchpad.net/bugs/1883916 commit 8f7dc9ae upstream. Using l2tp_tunnel_find() in l2tp_ip_recv() is wrong for two reasons: * It doesn't take a reference on the returned tunnel, which makes the call racy wrt. concurrent tunnel deletion. * The lookup is only based on the tunnel identifier, so it can return a tunnel that doesn't match the packet's addresses or protocol. For example, a packet sent to an L2TPv3 over IPv6 tunnel can be delivered to an L2TPv2 over UDPv4 tunnel. This is worse than a simple cross-talk: when delivering the packet to an L2TP over UDP tunnel, the corresponding socket is UDP, where ->sk_backlog_rcv() is NULL. Calling sk_receive_skb() will then crash the kernel by trying to execute this callback. And l2tp_tunnel_find() isn't even needed here. __l2tp_ip_bind_lookup() properly checks the socket binding and connection settings. It was used as a fallback mechanism for finding tunnels that didn't have their data path registered yet. But it's not limited to this case and can be used to replace l2tp_tunnel_find() in the general case. Fix l2tp_ip6 in the same way. Fixes: 0d76751f ("l2tp: Add L2TPv3 IP encapsulation (no UDP) support") Fixes: a32e0eec ("l2tp: introduce L2TPv3 IP encapsulation support for IPv6") Signed-off-by:
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Guillaume Nault authored
BugLink: https://bugs.launchpad.net/bugs/1883916 commit 2777e2ab upstream. Callers of l2tp_nl_session_find() need to hold a reference on the returned session since there's no guarantee that it isn't going to disappear from under them. Relying on the fact that no l2tp netlink message may be processed concurrently isn't enough: sessions can be deleted by other means (e.g. by closing the PPPOL2TP socket of a ppp pseudowire). l2tp_nl_cmd_session_delete() is a bit special: it runs a callback function that may require a previous call to session->ref(). In particular, for ppp pseudowires, the callback is l2tp_session_delete(), which then calls pppol2tp_session_close() and dereferences the PPPOL2TP socket. The socket might already be gone at the moment l2tp_session_delete() calls session->ref(), so we need to take a reference during the session lookup. So we need to pass the do_ref variable down to l2tp_session_get() and l2tp_session_get_by_ifname(). Since all callers have to be updated, l2tp_session_find_by_ifname() and l2tp_nl_session_find() are renamed to reflect their new behaviour. Fixes: 309795f4 ("l2tp: Add netlink control API for L2TP") Signed-off-by:
Amit Pundir <amit.pundir@linaro.org> Signed-off-by:
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Guillaume Nault authored
BugLink: https://bugs.launchpad.net/bugs/1883916 commit 5e6a9e5a upstream. l2tp_session_find() doesn't take any reference on the returned session. Therefore, the session may disappear while sending the notification. Use l2tp_session_get() instead and decrement session's refcount once the notification is sent. Backporting Notes This is a backport of a backport. Fixes: 33f72e6f ("l2tp : multicast notification to the registered listeners") Signed-off-by:
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Guillaume Nault authored
BugLink: https://bugs.launchpad.net/bugs/1883916 commit d5e3a190 upstream. It's not enough to check for sockets bound to same address at the beginning of l2tp_ip{,6}_bind(): even if no socket is found at that time, a socket with the same address could be bound before we take the l2tp lock again. This patch moves the lookup right before inserting the new socket, so that no change can ever happen to the list between address lookup and socket insertion. Care is taken to avoid side effects on the socket in case of failure. That is, modifications of the socket are done after the lookup, when binding is guaranteed to succeed, and before releasing the l2tp lock, so that concurrent lookups will always see fully initialised sockets. For l2tp_ip, 'ret' is set to -EINVAL before checking the SOCK_ZAPPED bit. Error code was mistakenly set to -EADDRINUSE on error by commit 32c23116 ("l2tp: fix racy SOCK_ZAPPED flag check in l2tp_ip{,6}_bind()"). Using -EINVAL restores original behaviour. For l2tp_ip6, the lookup is now always done with the correct bound device. Before this patch, when binding to a link-local address, the lookup was done with the original sk->sk_bound_dev_if, which was later overwritten with addr->l2tp_scope_id. Lookup is now performed with the final sk->sk_bound_dev_if value. Finally, the (addr_len >= sizeof(struct sockaddr_in6)) check has been dropped: addr is a sockaddr_l2tpip6 not sockaddr_in6 and addr_len has already been checked at this point (this part of the code seems to have been copy-pasted from net/ipv6/raw.c). Signed-off-by:
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Guillaume Nault authored
BugLink: https://bugs.launchpad.net/bugs/1883916 commit 0382a25a upstream. Socket flags aren't updated atomically, so the socket must be locked while reading the SOCK_ZAPPED flag. This issue exists for both l2tp_ip and l2tp_ip6. For IPv6, this patch also brings error handling for __ip6_datagram_connect() failures. Signed-off-by:
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Vishal Verma authored
BugLink: https://bugs.launchpad.net/bugs/1883916 [ Upstream commit 2f8c9011 ] We call btt_log_read() twice, once to get the 'old' log entry, and again to get the 'new' entry. However, we have no use for the 'old' entry, so remove it. Cc: Dan Williams <dan.j.williams@intel.com> Signed-off-by:
Vishal Verma <vishal.l.verma@intel.com> Signed-off-by:
Dan Williams <dan.j.williams@intel.com> Signed-off-by:
Sasha Levin <sashal@kernel.org> Signed-off-by:
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Colin Ian King authored
BugLink: https://bugs.launchpad.net/bugs/1883916 commit 98e26302 upstream. Currently the kfree of output.pointer can be potentially freeing an uninitalized pointer in the case where out_data is NULL. Fix this by reworking the case where out_data is not-null to perform the ACPI status check and also the kfree of outpoint.pointer in one block and hence ensuring the pointer is only freed when it has been used. Also replace the if (ptr != NULL) idiom with just if (ptr). Fixes: ff0e9f26 ("platform/x86: alienware-wmi: Correct a memory leak") Signed-off-by:
Colin Ian King <colin.king@canonical.com> Signed-off-by:
Darren Hart (VMware) <dvhart@infradead.org> Signed-off-by:
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Brent Lu authored
BugLink: https://bugs.launchpad.net/bugs/1883916 commit e7513c57 upstream. There is a corner case that ALSA keeps increasing the hw_ptr but DMA already stop working/updating the position for a long time. In following log we can see the position returned from DMA driver does not move at all but the hw_ptr got increased at some point of time so snd_pcm_avail() will return a large number which seems to be a buffer underrun event from user space program point of view. The program thinks there is space in the buffer and fill more data. [ 418.510086] sound pcmC0D5p: pos 96 hw_ptr 96 appl_ptr 4096 avail 12368 [ 418.510149] sound pcmC0D5p: pos 96 hw_ptr 96 appl_ptr 6910 avail 9554 ... [ 418.681052] sound pcmC0D5p: pos 96 hw_ptr 96 appl_ptr 15102 avail 1362 [ 418.681130] sound pcmC0D5p: pos 96 hw_ptr 96 appl_ptr 16464 avail 0 [ 418.726515] sound pcmC0D5p: pos 96 hw_ptr 16464 appl_ptr 16464 avail 16368 This is because the hw_base will be increased by runtime->buffer_size frames unconditionally if the hw_ptr is not updated for over half of buffer time. As the hw_base increases, so does the hw_ptr increased by the same number. The avail value returned from snd_pcm_avail() could exceed the limit (buffer_size) easily becase the hw_ptr itself got increased by same buffer_size samples when the corner case happens. In following log, the buffer_size is 16368 samples but the avail is 21810 samples so CRAS server complains about it. [ 418.851755] sound pcmC0D5p: pos 96 hw_ptr 16464 appl_ptr 27390 avail 5442 [ 418.926491] sound pcmC0D5p: pos 96 hw_ptr 32832 appl_ptr 27390 avail 21810 cras_server[1907]: pcm_avail returned frames larger than buf_size: sof-glkda7219max: :0,5: 21810 > 16368 By updating runtime->hw_ptr_jiffies each time the HWSYNC is called, the hw_base will keep the same when buffer stall happens at long as the interval between each HWSYNC call is shorter than half of buffer time. Following is a log captured by a patched kernel. The hw_base/hw_ptr value is fixed in this corner case and user space program should be aware of the buffer stall and handle it. [ 293.525543] sound pcmC0D5p: pos 96 hw_ptr 96 appl_ptr 4096 avail 12368 [ 293.525606] sound pcmC0D5p: pos 96 hw_ptr 96 appl_ptr 6880 avail 9584 [ 293.525975] sound pcmC0D5p: pos 96 hw_ptr 96 appl_ptr 10976 avail 5488 [ 293.611178] sound pcmC0D5p: pos 96 hw_ptr 96 appl_ptr 15072 avail 1392 [ 293.696429] sound pcmC0D5p: pos 96 hw_ptr 96 appl_ptr 16464 avail 0 ... [ 381.139517] sound pcmC0D5p: pos 96 hw_ptr 96 appl_ptr 16464 avail 0 Signed-off-by:
Brent Lu <brent.lu@intel.com> Reviewed-by:
Jaroslav Kysela <perex@perex.cz> Cc: <stable@vger.kernel.org> Link: https://lore.kernel.org/r/1589776238-23877-1-git-send-email-brent.lu@intel.comSigned-off-by:
Takashi Iwai <tiwai@suse.de> Signed-off-by:
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Daniel Jordan authored
BugLink: https://bugs.launchpad.net/bugs/1883916 [ Upstream commit 065cf577] With the removal of the padata timer, padata_do_serial no longer needs special CPU handling, so remove it. Signed-off-by:
Daniel Jordan <daniel.m.jordan@oracle.com> Cc: Herbert Xu <herbert@gondor.apana.org.au> Cc: Steffen Klassert <steffen.klassert@secunet.com> Cc: linux-crypto@vger.kernel.org Cc: linux-kernel@vger.kernel.org Signed-off-by:
Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by:
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Daniel Jordan authored
BugLink: https://bugs.launchpad.net/bugs/1883916 [ Upstream commit ec9c7d19 ] Exercising CPU hotplug on a 5.2 kernel with recent padata fixes from cryptodev-2.6.git in an 8-CPU kvm guest... # modprobe tcrypt alg="pcrypt(rfc4106(gcm(aes)))" type=3 # echo 0 > /sys/devices/system/cpu/cpu1/online # echo c > /sys/kernel/pcrypt/pencrypt/parallel_cpumask # modprobe tcrypt mode=215 ...caused the following crash: BUG: kernel NULL pointer dereference, address: 0000000000000000 #PF: supervisor read access in kernel mode #PF: error_code(0x0000) - not-present page PGD 0 P4D 0 Oops: 0000 [#1] SMP PTI CPU: 2 PID: 134 Comm: kworker/2:2 Not tainted 5.2.0-padata-base+ #7 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-<snip> Workqueue: pencrypt padata_parallel_worker RIP: 0010:padata_reorder+0xcb/0x180 ... Call Trace: padata_do_serial+0x57/0x60 pcrypt_aead_enc+0x3a/0x50 [pcrypt] padata_parallel_worker+0x9b/0xe0 process_one_work+0x1b5/0x3f0 worker_thread+0x4a/0x3c0 ... In padata_alloc_pd, pd->cpu is set using the user-supplied cpumask instead of the effective cpumask, and in this case cpumask_first picked an offline CPU. The offline CPU's reorder->list.next is NULL in padata_reorder because the list wasn't initialized in padata_init_pqueues, which only operates on CPUs in the effective mask. Fix by using the effective mask in padata_alloc_pd. Fixes: 6fc4dbcf ("padata: Replace delayed timer with immediate workqueue in padata_reorder") Signed-off-by:
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Herbert Xu authored
BugLink: https://bugs.launchpad.net/bugs/1883916 [ Upstream commit 6fc4dbcf ] The function padata_reorder will use a timer when it cannot progress while completed jobs are outstanding (pd->reorder_objects > 0). This is suboptimal as if we do end up using the timer then it would have introduced a gratuitous delay of one second. In fact we can easily distinguish between whether completed jobs are outstanding and whether we can make progress. All we have to do is look at the next pqueue list. This patch does that by replacing pd->processed with pd->cpu so that the next pqueue is more accessible. A work queue is used instead of the original try_again to avoid hogging the CPU. Note that we don't bother removing the work queue in padata_flush_queues because the whole premise is broken. You cannot flush async crypto requests so it makes no sense to even try. A subsequent patch will fix it by replacing it with a ref counting scheme. Signed-off-by:
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Peter Zijlstra authored
BugLink: https://bugs.launchpad.net/bugs/1883916 [ Upstream commit c743f0a5 ] More users for for_each_cpu_wrap() have appeared. Promote the construct to generic cpumask interface. The implementation is slightly modified to reduce arguments. Signed-off-by:
Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Lauro Ramos Venancio <lvenanci@redhat.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Mike Galbraith <efault@gmx.de> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Rik van Riel <riel@redhat.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: lwang@redhat.com Link: http://lkml.kernel.org/r/20170414122005.o35me2h5nowqkxbv@hirez.programming.kicks-ass.netSigned-off-by:
Ingo Molnar <mingo@kernel.org> [dj: include only what's added to the cpumask interface, 4.4 doesn't have them in the scheduler] Signed-off-by:
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Mathias Krause authored
BugLink: https://bugs.launchpad.net/bugs/1883916 [ Upstream commit 1bd845bc ] The parallel queue per-cpu data structure gets initialized only for CPUs in the 'pcpu' CPU mask set. This is not sufficient as the reorder timer may run on a different CPU and might wrongly decide it's the target CPU for the next reorder item as per-cpu memory gets memset(0) and we might be waiting for the first CPU in cpumask.pcpu, i.e. cpu_index 0. Make the '__this_cpu_read(pd->pqueue->cpu_index) == next_queue->cpu_index' compare in padata_get_next() fail in this case by initializing the cpu_index member of all per-cpu parallel queues. Use -1 for unused ones. Signed-off-by:
Mathias Krause <minipli@googlemail.com> Signed-off-by:
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Kevin Hao authored
BugLink: https://bugs.launchpad.net/bugs/1883916 commit 1413ef63 upstream. The struct cdev is embedded in the struct i2c_dev. In the current code, we would free the i2c_dev struct directly in put_i2c_dev(), but the cdev is manged by a kobject, and the release of it is not predictable. So it is very possible that the i2c_dev is freed before the cdev is entirely released. We can easily get the following call trace with CONFIG_DEBUG_KOBJECT_RELEASE and CONFIG_DEBUG_OBJECTS_TIMERS enabled. ODEBUG: free active (active state 0) object type: timer_list hint: delayed_work_timer_fn+0x0/0x38 WARNING: CPU: 19 PID: 1 at lib/debugobjects.c:325 debug_print_object+0xb0/0xf0 Modules linked in: CPU: 19 PID: 1 Comm: swapper/0 Tainted: G W 5.2.20-yocto-standard+ #120 Hardware name: Marvell OcteonTX CN96XX board (DT) pstate: 80c00089 (Nzcv daIf +PAN +UAO) pc : debug_print_object+0xb0/0xf0 lr : debug_print_object+0xb0/0xf0 sp : ffff00001292f7d0 x29: ffff00001292f7d0 x28: ffff800b82151788 x27: 0000000000000001 x26: ffff800b892c0000 x25: ffff0000124a2558 x24: 0000000000000000 x23: ffff00001107a1d8 x22: ffff0000116b5088 x21: ffff800bdc6afca8 x20: ffff000012471ae8 x19: ffff00001168f2c8 x18: 0000000000000010 x17: 00000000fd6f304b x16: 00000000ee79de43 x15: ffff800bc0e80568 x14: 79616c6564203a74 x13: 6e6968207473696c x12: 5f72656d6974203a x11: ffff0000113f0018 x10: 0000000000000000 x9 : 000000000000001f x8 : 0000000000000000 x7 : ffff0000101294cc x6 : 0000000000000000 x5 : 0000000000000000 x4 : 0000000000000001 x3 : 00000000ffffffff x2 : 0000000000000000 x1 : 387fc15c8ec0f200 x0 : 0000000000000000 Call trace: debug_print_object+0xb0/0xf0 __debug_check_no_obj_freed+0x19c/0x228 debug_check_no_obj_freed+0x1c/0x28 kfree+0x250/0x440 put_i2c_dev+0x68/0x78 i2cdev_detach_adapter+0x60/0xc8 i2cdev_notifier_call+0x3c/0x70 notifier_call_chain+0x8c/0xe8 blocking_notifier_call_chain+0x64/0x88 device_del+0x74/0x380 device_unregister+0x54/0x78 i2c_del_adapter+0x278/0x2d0 unittest_i2c_bus_remove+0x3c/0x80 platform_drv_remove+0x30/0x50 device_release_driver_internal+0xf4/0x1c0 driver_detach+0x58/0xa0 bus_remove_driver+0x84/0xd8 driver_unregister+0x34/0x60 platform_driver_unregister+0x20/0x30 of_unittest_overlay+0x8d4/0xbe0 of_unittest+0xae8/0xb3c do_one_initcall+0xac/0x450 do_initcall_level+0x208/0x224 kernel_init_freeable+0x2d8/0x36c kernel_init+0x18/0x108 ret_from_fork+0x10/0x1c irq event stamp: 3934661 hardirqs last enabled at (3934661): [<ffff00001009fa04>] debug_exception_exit+0x4c/0x58 hardirqs last disabled at (3934660): [<ffff00001009fb14>] debug_exception_enter+0xa4/0xe0 softirqs last enabled at (3934654): [<ffff000010081d94>] __do_softirq+0x46c/0x628 softirqs last disabled at (3934649): [<ffff0000100b4a1c>] irq_exit+0x104/0x118 This is a common issue when using cdev embedded in a struct. Fortunately, we already have a mechanism to solve this kind of issue. Please see commit 233ed09d ("chardev: add helper function to register char devs with a struct device") for more detail. In this patch, we choose to embed the struct device into the i2c_dev, and use the API provided by the commit 233ed09d to make sure that the release of i2c_dev and cdev are in sequence. Signed-off-by:
Kevin Hao <haokexin@gmail.com> Signed-off-by:
Wolfram Sang <wsa@the-dreams.de> Signed-off-by:
Ben Hutchings <ben.hutchings@codethink.co.uk> Signed-off-by:
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viresh kumar authored
BugLink: https://bugs.launchpad.net/bugs/1883916 commit 5136ed4f upstream. There is no code protecting i2c_dev to be freed after it is returned from i2c_dev_get_by_minor() and using it to access the value which we already have (minor) isn't safe really. Avoid using it and get the adapter directly from 'minor'. Signed-off-by:
Viresh Kumar <viresh.kumar@linaro.org> Reviewed-by:
Jean Delvare <jdelvare@suse.de> Tested-by:
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Dan Carpenter authored
BugLink: https://bugs.launchpad.net/bugs/1883916 commit e6be18f6 upstream. The call to put_i2c_dev() frees "i2c_dev" so there is a use after free when we call cdev_del(&i2c_dev->cdev). Fixes: d6760b14 ('i2c: dev: switch from register_chrdev to cdev API') Signed-off-by:
Dan Carpenter <dan.carpenter@oracle.com> Signed-off-by:
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Wolfram Sang authored
BugLink: https://bugs.launchpad.net/bugs/1883916 commit 72a71f86 upstream. I stumbled multiple times over 'return_i2c_dev', especially before the actual 'return res'. It makes the code hard to read, so reanme the function to 'put_i2c_dev' which also better matches 'get_free_i2c_dev'. Signed-off-by:
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Erico Nunes authored
BugLink: https://bugs.launchpad.net/bugs/1883916 commit d6760b14 upstream. i2c-dev had never moved away from the older register_chrdev interface to implement its char device registration. The register_chrdev API has the limitation of enabling only up to 256 i2c-dev busses to exist. Large platforms with lots of i2c devices (i.e. pluggable transceivers) with dedicated busses may have to exceed that limit. In particular, there are also platforms making use of the i2c bus multiplexing API, which instantiates a virtual bus for each possible multiplexed selection. This patch removes the register_chrdev usage and replaces it with the less old cdev API, which takes away the 256 i2c-dev bus limitation. It should not have any other impact for i2c bus drivers or user space. This patch has been tested on qemu x86 and qemu powerpc platforms with the aid of a module which adds and removes 5000 virtual i2c busses, as well as validated on an existing powerpc hardware platform which makes use of the i2c bus multiplexing API. i2c-dev busses with device minor numbers larger than 256 have also been validated to work with the existing i2c-tools. Signed-off-by:
Erico Nunes <erico.nunes@datacom.ind.br> [wsa: kept includes sorted] Signed-off-by:
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Shuah Khan authored
BugLink: https://bugs.launchpad.net/bugs/1883916 commit 6f0dd24a upstream. Media devnode open/ioctl could be in progress when media device unregister is initiated. System calls and ioctls check media device registered status at the beginning, however, there is a window where unregister could be in progress without changing the media devnode status to unregistered. process 1 process 2 fd = open(/dev/media0) media_devnode_is_registered() (returns true here) media_device_unregister() (unregister is in progress and devnode isn't unregistered yet) ... ioctl(fd, ...) __media_ioctl() media_devnode_is_registered() (returns true here) ... media_devnode_unregister() ... (driver releases the media device memory) media_device_ioctl() (By this point devnode->media_dev does not point to allocated memory. use-after free in in mutex_lock_nested) BUG: KASAN: use-after-free in mutex_lock_nested+0x79c/0x800 at addr ffff8801ebe914f0 Fix it by clearing register bit when unregister starts to avoid the race. process 1 process 2 fd = open(/dev/media0) media_devnode_is_registered() (could return true here) media_device_unregister() (clear the register bit, then start unregister.) ... ioctl(fd, ...) __media_ioctl() media_devnode_is_registered() (return false here, ioctl returns I/O error, and will not access media device memory) ... media_devnode_unregister() ... (driver releases the media device memory) Signed-off-by:
Shuah Khan <shuahkh@osg.samsung.com> Suggested-by:
Sakari Ailus <sakari.ailus@linux.intel.com> Reported-by:
Mauro Carvalho Chehab <mchehab@osg.samsung.com> Tested-by:
Mauro Carvalho Chehab <mchehab@s-opensource.com> [bwh: Backported to 4.4: adjut filename, context] Signed-off-by:
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Shuah Khan authored
BugLink: https://bugs.launchpad.net/bugs/1883916 commit 5b28dde5 upstream. When driver unbinds while media_ioctl is in progress, cdev_put() fails with when app exits after driver unbinds. Add devnode struct device kobj as the cdev parent kobject. cdev_add() gets a reference to it and releases it in cdev_del() ensuring that the devnode is not deallocated as long as the application has the device file open. media_devnode_register() initializes the struct device kobj before calling cdev_add(). media_devnode_unregister() does cdev_del() and then deletes the device. devnode is released when the last reference to the struct device is gone. This problem is found on uvcvideo, em28xx, and au0828 drivers and fix has been tested on all three. kernel: [ 193.599736] BUG: KASAN: use-after-free in cdev_put+0x4e/0x50 kernel: [ 193.599745] Read of size 8 by task media_device_te/1851 kernel: [ 193.599792] INFO: Allocated in __media_device_register+0x54 kernel: [ 193.599951] INFO: Freed in media_devnode_release+0xa4/0xc0 kernel: [ 193.601083] Call Trace: kernel: [ 193.601093] [<ffffffff81aecac3>] dump_stack+0x67/0x94 kernel: [ 193.601102] [<ffffffff815359b2>] print_trailer+0x112/0x1a0 kernel: [ 193.601111] [<ffffffff8153b5e4>] object_err+0x34/0x40 kernel: [ 193.601119] [<ffffffff8153d9d4>] kasan_report_error+0x224/0x530 kernel: [ 193.601128] [<ffffffff814a2c3d>] ? kzfree+0x2d/0x40 kernel: [ 193.601137] [<ffffffff81539d72>] ? kfree+0x1d2/0x1f0 kernel: [ 193.601154] [<ffffffff8157ca7e>] ? cdev_put+0x4e/0x50 kernel: [ 193.601162] [<ffffffff8157ca7e>] cdev_put+0x4e/0x50 kernel: [ 193.601170] [<ffffffff815767eb>] __fput+0x52b/0x6c0 kernel: [ 193.601179] [<ffffffff8117743a>] ? switch_task_namespaces+0x2a kernel: [ 193.601188] [<ffffffff815769ee>] ____fput+0xe/0x10 kernel: [ 193.601196] [<ffffffff81170023>] task_work_run+0x133/0x1f0 kernel: [ 193.601204] [<ffffffff8117746e>] ? switch_task_namespaces+0x5e kernel: [ 193.601213] [<ffffffff8111b50c>] do_exit+0x72c/0x2c20 kernel: [ 193.601224] [<ffffffff8111ade0>] ? release_task+0x1250/0x1250 - - - kernel: [ 193.601360] [<ffffffff81003587>] ? exit_to_usermode_loop+0xe7 kernel: [ 193.601368] [<ffffffff810035c0>] exit_to_usermode_loop+0x120 kernel: [ 193.601376] [<ffffffff810061da>] syscall_return_slowpath+0x16a kernel: [ 193.601386] [<ffffffff82848b33>] entry_SYSCALL_64_fastpath+0xa6 Signed-off-by:
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Mauro Carvalho Chehab authored
BugLink: https://bugs.launchpad.net/bugs/1883916 commit a087ce70 upstream. struct media_devnode is currently embedded at struct media_device. While this works fine during normal usage, it leads to a race condition during devnode unregister. the problem is that drivers assume that, after calling media_device_unregister(), the struct that contains media_device can be freed. This is not true, as it can't be freed until userspace closes all opened /dev/media devnodes. In other words, if the media devnode is still open, and media_device gets freed, any call to an ioctl will make the core to try to access struct media_device, with will cause an use-after-free and even GPF. Fix this by dynamically allocating the struct media_devnode and only freeing it when it is safe. Signed-off-by:
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Mauro Carvalho Chehab authored
BugLink: https://bugs.launchpad.net/bugs/1883916 commit 163f1e93 upstream. Along all media controller code, "mdev" is used to represent a pointer to struct media_device, and "devnode" for a pointer to struct media_devnode. However, inside media-devnode.[ch], "mdev" is used to represent a pointer to struct media_devnode. This is very confusing and may lead to development errors. So, let's change all occurrences at media-devnode.[ch] to also use "devnode" for such pointers. This patch doesn't make any functional changes. Signed-off-by:
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Max Kellermann authored
BugLink: https://bugs.launchpad.net/bugs/1883916 commit 88336e17 upstream. We should protect the device unregister patch too, at the error condition. Signed-off-by:
Max Kellermann <max@duempel.org> Signed-off-by:
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Max Kellermann authored
BugLink: https://bugs.launchpad.net/bugs/1883916 commit bf244f66 upstream. Callbacks invoked from put_device() may free the struct media_devnode pointer, so any cleanup needs to be done before put_device(). Signed-off-by:
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Shuah Khan authored
BugLink: https://bugs.launchpad.net/bugs/1883916 commit d40ec6fd upstream. Fix media_open() to clear filp->private_data when file open fails. Signed-off-by:
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Thomas Gleixner authored
BugLink: https://bugs.launchpad.net/bugs/1883916 [ Upstream commit 8101b5a1 ] Stephen reported the following build warning on a ARM multi_v7_defconfig build with GCC 9.2.1: kernel/futex.c: In function 'do_futex': kernel/futex.c:1676:17: warning: 'oldval' may be used uninitialized in this function [-Wmaybe-uninitialized] 1676 | return oldval == cmparg; | ~~~~~~~^~~~~~~~~ kernel/futex.c:1652:6: note: 'oldval' was declared here 1652 | int oldval, ret; | ^~~~~~ introduced by commit a08971e9 ("futex: arch_futex_atomic_op_inuser() calling conventions change"). While that change should not make any difference it confuses GCC which fails to work out that oldval is not referenced when the return value is not zero. GCC fails to properly analyze arch_futex_atomic_op_inuser(). It's not the early return, the issue is with the assembly macros. GCC fails to detect that those either set 'ret' to 0 and set oldval or set 'ret' to -EFAULT which makes oldval uninteresting. The store to the callsite supplied oldval pointer is conditional on ret == 0. The straight forward way to solve this is to make the store unconditional. Aside of addressing the build warning this makes sense anyway because it removes the conditional from the fastpath. In the error case the stored value is uninteresting and the extra store does not matter at all. Reported-by:
Stephen Rothwell <sfr@canb.auug.org.au> Signed-off-by:
Thomas Gleixner <tglx@linutronix.de> Link: https://lkml.kernel.org/r/87pncao2ph.fsf@nanos.tec.linutronix.deSigned-off-by:
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Hans de Goede authored
BugLink: https://bugs.launchpad.net/bugs/1883916 [ Upstream commit 3bd12da7 ] asus-nb-wmi does not add any extra functionality on these Asus Transformer books. They have detachable keyboards, so the hotkeys are send through a HID device (and handled by the hid-asus driver) and also the rfkill functionality is not used on these devices. Besides not adding any extra functionality, initializing the WMI interface on these devices actually has a negative side-effect. For some reason the \_SB.ATKD.INIT() function which asus_wmi_platform_init() calls drives GPO2 (INT33FC:02) pin 8, which is connected to the front facing webcam LED, high and there is no (WMI or other) interface to drive this low again causing the LED to be permanently on, even during suspend. This commit adds a blacklist of DMI system_ids on which not to load the asus-nb-wmi and adds these Transformer books to this list. This fixes the webcam LED being permanently on under Linux. Signed-off-by:
Hans de Goede <hdegoede@redhat.com> Signed-off-by:
Andy Shevchenko <andriy.shevchenko@linux.intel.com> Signed-off-by:
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Alan Stern authored
BugLink: https://bugs.launchpad.net/bugs/1883916 [ Upstream commit ac854131 ] The syzbot fuzzer found a race between URB submission to endpoint 0 and device reset. Namely, during the reset we call usb_ep0_reinit() because the characteristics of ep0 may have changed (if the reset follows a firmware update, for example). While usb_ep0_reinit() is running there is a brief period during which the pointers stored in udev->ep_in[0] and udev->ep_out[0] are set to NULL, and if an URB is submitted to ep0 during that period, usb_urb_ep_type_check() will report it as a driver bug. In the absence of those pointers, the routine thinks that the endpoint doesn't exist. The log message looks like this: ------------[ cut here ]------------ usb 2-1: BOGUS urb xfer, pipe 2 != type 2 WARNING: CPU: 0 PID: 9241 at drivers/usb/core/urb.c:478 usb_submit_urb+0x1188/0x1460 drivers/usb/core/urb.c:478 Now, although submitting an URB while the device is being reset is a questionable thing to do, it shouldn't count as a driver bug as severe as submitting an URB for an endpoint that doesn't exist. Indeed, endpoint 0 always exists, even while the device is in its unconfigured state. To prevent these misleading driver bug reports, this patch updates usb_disable_endpoint() to avoid clearing the ep_in[] and ep_out[] pointers when the endpoint being disabled is ep0. There's no danger of leaving a stale pointer in place, because the usb_host_endpoint structure being pointed to is stored permanently in udev->ep0; it doesn't get deallocated until the entire usb_device structure does. Reported-and-tested-by: syzbot+db339689b2101f6f6071@syzkaller.appspotmail.com Signed-off-by:
Alan Stern <stern@rowland.harvard.edu> Link: https://lore.kernel.org/r/Pine.LNX.4.44L0.2005011558590.903-100000@netrider.rowland.orgSigned-off-by:
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Wu Bo authored
BugLink: https://bugs.launchpad.net/bugs/1883916 [ Upstream commit 4d8e28ff ] If the ceph_mdsc_open_export_target_session() return fails, it will do a "goto retry", but the session mutex has already been unlocked. Re-lock the mutex in that case to ensure that we don't unlock it twice. Signed-off-by:
Wu Bo <wubo40@huawei.com> Reviewed-by:
"Yan, Zheng" <zyan@redhat.com> Signed-off-by:
Ilya Dryomov <idryomov@gmail.com> Signed-off-by:
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Sebastian Reichel authored
BugLink: https://bugs.launchpad.net/bugs/1883916 [ Upstream commit f9e82295 ] Add support for P80H84 touchscreen from eGalaxy: idVendor 0x0eef D-WAV Scientific Co., Ltd idProduct 0xc002 iManufacturer 1 eGalax Inc. iProduct 2 eGalaxTouch P80H84 2019 vDIVA_1204_T01 k4.02.146 Signed-off-by:
Sebastian Reichel <sebastian.reichel@collabora.com> Signed-off-by:
Jiri Kosina <jkosina@suse.cz> Signed-off-by:
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Al Viro authored
BugLink: https://bugs.launchpad.net/bugs/1883916 [ Upstream commit 4e89b721 ] cpy and set really should be size_t; we won't get an overflow on that, since sysctl_nr_open can't be set above ~(size_t)0 / sizeof(void *), so nr that would've managed to overflow size_t on that multiplication won't get anywhere near copy_fdtable() - we'll fail with EMFILE before that. Cc: stable@kernel.org # v2.6.25+ Fixes: 9cfe015a (get rid of NR_OPEN and introduce a sysctl_nr_open) Reported-by:
Thiago Macieira <thiago.macieira@intel.com> Signed-off-by:
Al Viro <viro@zeniv.linux.org.uk> Signed-off-by:
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Roberto Sassu authored
BugLink: https://bugs.launchpad.net/bugs/1883916 [ Upstream commit 53de3b08 ] This patch avoids a kernel panic due to accessing an error pointer set by crypto_alloc_shash(). It occurs especially when there are many files that require an unsupported algorithm, as it would increase the likelihood of the following race condition: Task A: *tfm = crypto_alloc_shash() <= error pointer Task B: if (*tfm == NULL) <= *tfm is not NULL, use it Task B: rc = crypto_shash_init(desc) <= panic Task A: *tfm = NULL This patch uses the IS_ERR_OR_NULL macro to determine whether or not a new crypto context must be created. Cc: stable@vger.kernel.org Fixes: d46eb369 ("evm: crypto hash replaced by shash") Co-developed-by:
Krzysztof Struczynski <krzysztof.struczynski@huawei.com> Signed-off-by:
Roberto Sassu <roberto.sassu@huawei.com> Signed-off-by:
Mimi Zohar <zohar@linux.ibm.com> Signed-off-by:
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Mathias Krause authored
BugLink: https://bugs.launchpad.net/bugs/1883916 commit 350ef88e upstream. If the algorithm we're parallelizing is asynchronous we might change CPUs between padata_do_parallel() and padata_do_serial(). However, we don't expect this to happen as we need to enqueue the padata object into the per-cpu reorder queue we took it from, i.e. the same-cpu's parallel queue. Ensure we're not switching CPUs for a given padata object by tracking the CPU within the padata object. If the serial callback gets called on the wrong CPU, defer invoking padata_reorder() via a kernel worker on the CPU we're expected to run on. Signed-off-by:
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Mathias Krause authored
BugLink: https://bugs.launchpad.net/bugs/1883916 commit cf5868c8 upstream. The reorder timer function runs on the CPU where the timer interrupt was handled which is not necessarily one of the CPUs of the 'pcpu' CPU mask set. Ensure the padata_reorder() callback runs on the correct CPU, which is one in the 'pcpu' CPU mask set and, preferrably, the next expected one. Do so by comparing the current CPU with the expected target CPU. If they match, call padata_reorder() right away. If they differ, schedule a work item on the target CPU that does the padata_reorder() call for us. Signed-off-by:
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