- 20 Nov, 2016 40 commits
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Paul Blakey authored
commit 2c0f8ce1 upstream. Set and verify signature calculates the signature for each of the mailbox nodes, even for those that are unused (from cache). Added a missing length check to set and verify only those which are used. While here, also moved the setting of msg's nodes token to where we already go over them. This saves a pass because checksum is disabled, and the only useful thing remaining that set signature does is setting the token. Fixes: e126ba97 ('mlx5: Add driver for Mellanox Connect-IB adapters') Signed-off-by:
Paul Blakey <paulb@mellanox.com> Signed-off-by:
Saeed Mahameed <saeedm@mellanox.com> Signed-off-by:
David S. Miller <davem@davemloft.net> [bwh: Backported to 3.16: adjust context] Signed-off-by:
Ben Hutchings <ben@decadent.org.uk>
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Dmitry Torokhov authored
commit 47af45d6 upstream. The commit 40974618 ("Input: i8042 - break load dependency ...") correctly set up ps2_cmd_mutex pointer for the KBD port but forgot to do the same for AUX port(s), which results in communication on KBD and AUX ports to clash with each other. Fixes: 40974618 ("Input: i8042 - break load dependency ...") Reported-by:
Bruno Wolff III <bruno@wolff.to> Tested-by:
Dmitry Torokhov <dmitry.torokhov@gmail.com> Signed-off-by:
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Christian König authored
commit 13f479b9 upstream. This bug seems to be present for a very long time. Signed-off-by:
Christian König <christian.koenig@amd.com> Reviewed-by:
Alex Deucher <alexander.deucher@amd.com> Signed-off-by:
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James Hogan authored
commit ba913e4f upstream. When mapping a page into the guest we error check using is_error_pfn(), however this doesn't detect a value of KVM_PFN_NOSLOT, indicating an error HVA for the page. This can only happen on MIPS right now due to unusual memslot management (e.g. being moved / removed / resized), or with an Enhanced Virtual Memory (EVA) configuration where the default KVM_HVA_ERR_* and kvm_is_error_hva() definitions are unsuitable (fixed in a later patch). This case will be treated as a pfn of zero, mapping the first page of physical memory into the guest. It would appear the MIPS KVM port wasn't updated prior to being merged (in v3.10) to take commit 81c52c56 ("KVM: do not treat noslot pfn as a error pfn") into account (merged v3.8), which converted a bunch of is_error_pfn() calls to is_error_noslot_pfn(). Switch to using is_error_noslot_pfn() instead to catch this case properly. Fixes: 858dd5d4 ("KVM/MIPS32: MMU/TLB operations for the Guest.") Signed-off-by:
James Hogan <james.hogan@imgtec.com> Cc: Paolo Bonzini <pbonzini@redhat.com> Cc: Radim Krčmář <rkrcmar@redhat.com> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: linux-mips@linux-mips.org Cc: kvm@vger.kernel.org Signed-off-by:
Paolo Bonzini <pbonzini@redhat.com> [james.hogan@imgtec.com: Backport to v4.7.y] Signed-off-by:
Greg Kroah-Hartman <gregkh@linuxfoundation.org> [bwh: Backported to 3.16: adjust filename] Signed-off-by:
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Linus Walleij authored
commit 2527ecc9 upstream. The UserMode (UM) Linux build was failing in gpiolib-of as it requires ioremap()/iounmap() to exist, which is absent from UM. The non-existence of IO memory is negatively defined as CONFIG_NO_IOMEM which means we need to depend on HAS_IOMEM. Cc: Geert Uytterhoeven <geert@linux-m68k.org> Reported-by:
kbuild test robot <fengguang.wu@intel.com> Signed-off-by:
Linus Walleij <linus.walleij@linaro.org> Signed-off-by:
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Eric Dumazet authored
commit bb1fceca upstream. When tcp_sendmsg() allocates a fresh and empty skb, it puts it at the tail of the write queue using tcp_add_write_queue_tail() Then it attempts to copy user data into this fresh skb. If the copy fails, we undo the work and remove the fresh skb. Unfortunately, this undo lacks the change done to tp->highest_sack and we can leave a dangling pointer (to a freed skb) Later, tcp_xmit_retransmit_queue() can dereference this pointer and access freed memory. For regular kernels where memory is not unmapped, this might cause SACK bugs because tcp_highest_sack_seq() is buggy, returning garbage instead of tp->snd_nxt, but with various debug features like CONFIG_DEBUG_PAGEALLOC, this can crash the kernel. This bug was found by Marco Grassi thanks to syzkaller. Fixes: 6859d494 ("[TCP]: Abstract tp->highest_sack accessing & point to next skb") Reported-by:
Marco Grassi <marco.gra@gmail.com> Signed-off-by:
Eric Dumazet <edumazet@google.com> Cc: Ilpo Järvinen <ilpo.jarvinen@helsinki.fi> Cc: Yuchung Cheng <ycheng@google.com> Cc: Neal Cardwell <ncardwell@google.com> Acked-by:
Neal Cardwell <ncardwell@google.com> Reviewed-by:
Cong Wang <xiyou.wangcong@gmail.com> Signed-off-by:
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Kent Overstreet authored
commit acc9cf8c upstream. This patch fixes a cachedev registration-time allocation deadlock. This can deadlock on boot if your initrd auto-registeres bcache devices: Allocator thread: [ 720.727614] INFO: task bcache_allocato:3833 blocked for more than 120 seconds. [ 720.732361] [<ffffffff816eeac7>] schedule+0x37/0x90 [ 720.732963] [<ffffffffa05192b8>] bch_bucket_alloc+0x188/0x360 [bcache] [ 720.733538] [<ffffffff810e6950>] ? prepare_to_wait_event+0xf0/0xf0 [ 720.734137] [<ffffffffa05302bd>] bch_prio_write+0x19d/0x340 [bcache] [ 720.734715] [<ffffffffa05190bf>] bch_allocator_thread+0x3ff/0x470 [bcache] [ 720.735311] [<ffffffff816ee41c>] ? __schedule+0x2dc/0x950 [ 720.735884] [<ffffffffa0518cc0>] ? invalidate_buckets+0x980/0x980 [bcache] Registration thread: [ 720.710403] INFO: task bash:3531 blocked for more than 120 seconds. [ 720.715226] [<ffffffff816eeac7>] schedule+0x37/0x90 [ 720.715805] [<ffffffffa05235cd>] __bch_btree_map_nodes+0x12d/0x150 [bcache] [ 720.716409] [<ffffffffa0522d30>] ? bch_btree_insert_check_key+0x1c0/0x1c0 [bcache] [ 720.717008] [<ffffffffa05236e4>] bch_btree_insert+0xf4/0x170 [bcache] [ 720.717586] [<ffffffff810e6950>] ? prepare_to_wait_event+0xf0/0xf0 [ 720.718191] [<ffffffffa0527d9a>] bch_journal_replay+0x14a/0x290 [bcache] [ 720.718766] [<ffffffff810cc90d>] ? ttwu_do_activate.constprop.94+0x5d/0x70 [ 720.719369] [<ffffffff810cf684>] ? try_to_wake_up+0x1d4/0x350 [ 720.719968] [<ffffffffa05317d0>] run_cache_set+0x580/0x8e0 [bcache] [ 720.720553] [<ffffffffa053302e>] register_bcache+0xe2e/0x13b0 [bcache] [ 720.721153] [<ffffffff81354cef>] kobj_attr_store+0xf/0x20 [ 720.721730] [<ffffffff812a2dad>] sysfs_kf_write+0x3d/0x50 [ 720.722327] [<ffffffff812a225a>] kernfs_fop_write+0x12a/0x180 [ 720.722904] [<ffffffff81225177>] __vfs_write+0x37/0x110 [ 720.723503] [<ffffffff81228048>] ? __sb_start_write+0x58/0x110 [ 720.724100] [<ffffffff812cedb3>] ? security_file_permission+0x23/0xa0 [ 720.724675] [<ffffffff812258a9>] vfs_write+0xa9/0x1b0 [ 720.725275] [<ffffffff8102479c>] ? do_audit_syscall_entry+0x6c/0x70 [ 720.725849] [<ffffffff81226755>] SyS_write+0x55/0xd0 [ 720.726451] [<ffffffff8106a390>] ? do_page_fault+0x30/0x80 [ 720.727045] [<ffffffff816f2cae>] system_call_fastpath+0x12/0x71 The fifo code in upstream bcache can't use the last element in the buffer, which was the cause of the bug: if you asked for a power of two size, it'd give you a fifo that could hold one less than what you asked for rather than allocating a buffer twice as big. Signed-off-by:
Kent Overstreet <kent.overstreet@gmail.com> Tested-by:
Eric Wheeler <bcache@linux.ewheeler.net> Signed-off-by:
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Eric Wheeler authored
commit d9dc1702 upstream. register_cache() is supposed to return an error string on error so that register_bcache() will will blkdev_put and cleanup other user counters, but it does not set 'char *err' when cache_alloc() fails (eg, due to memory pressure) and thus register_bcache() performs no cleanup. register_bcache() <----------\ <- no jump to err_close, no blkdev_put() | | +->register_cache() | <- fails to set char *err | | +->cache_alloc() ---/ <- returns error This patch sets `char *err` for this failure case so that register_cache() will cause register_bcache() to correctly jump to err_close and do cleanup. This was tested under OOM conditions that triggered the bug. Signed-off-by:
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Radim Krčmář authored
commit dccbfcf5 upstream. If vmcs12 does not intercept APIC_BASE writes, then KVM will handle the write with vmcs02 as the current VMCS. This will incorrectly apply modifications intended for vmcs01 to vmcs02 and L2 can use it to gain access to L0's x2APIC registers by disabling virtualized x2APIC while using msr bitmap that assumes enabled. Postpone execution of vmx_set_virtual_x2apic_mode until vmcs01 is the current VMCS. An alternative solution would temporarily make vmcs01 the current VMCS, but it requires more care. Fixes: 8d14695f ("x86, apicv: add virtual x2apic support") Reported-by:
Jim Mattson <jmattson@google.com> Reviewed-by:
Wanpeng Li <wanpeng.li@hotmail.com> Signed-off-by:
Radim Krčmář <rkrcmar@redhat.com> Signed-off-by:
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Mathias Nyman authored
commit f1f6d9a8 upstream. Remove the hcd after checking for the xhci last quirks, not before. This caused a hang on a Alpine Ridge xhci based maching which remove the whole xhci controller when unplugging the last usb device Signed-off-by:
Mathias Nyman <mathias.nyman@linux.intel.com> Signed-off-by:
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Jim Lin authored
commit 88716a93 upstream. After a device is disconnected, xhci_stop_device() will be invoked in xhci_bus_suspend(). Also the "disconnect" IRQ will have ISR to invoke xhci_free_virt_device() in this sequence. xhci_irq -> xhci_handle_event -> handle_cmd_completion -> xhci_handle_cmd_disable_slot -> xhci_free_virt_device If xhci->devs[slot_id] has been assigned to NULL in xhci_free_virt_device(), then virt_dev->eps[i].ring in xhci_stop_device() may point to an invlid address to cause kernel panic. virt_dev = xhci->devs[slot_id]; : if (virt_dev->eps[i].ring && virt_dev->eps[i].ring->dequeue) [] Unable to handle kernel paging request at virtual address 00001a68 [] pgd=ffffffc001430000 [] [00001a68] *pgd=000000013c807003, *pud=000000013c807003, *pmd=000000013c808003, *pte=0000000000000000 [] Internal error: Oops: 96000006 [#1] PREEMPT SMP [] CPU: 0 PID: 39 Comm: kworker/0:1 Tainted: G U [] Workqueue: pm pm_runtime_work [] task: ffffffc0bc0e0bc0 ti: ffffffc0bc0ec000 task.ti: ffffffc0bc0ec000 [] PC is at xhci_stop_device.constprop.11+0xb4/0x1a4 This issue is found when running with realtek ethernet device (0bda:8153). Signed-off-by:
Jim Lin <jilin@nvidia.com> Signed-off-by:
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Mathias Nyman authored
commit 33be1265 upstream. Fix "Command completion event does not match command" errors by always handling the command ring stopped events. The command ring stopped event is generated as a result of aborting or stopping the command ring with a register write. It is not caused by a command in the command queue, and thus won't have a matching command in the comman list. Solve it by handling the command ring stopped event before checking for a matching command. In most command time out cases we abort the command ring, and get a command ring stopped event. The events command pointer will point at the current command ring dequeue, which in most cases matches the timed out command in the command list, and no error messages are seen. If we instead get a command aborted event before the command ring stopped event, the abort event will increse the command ring dequeue pointer, and the following command ring stopped events command pointer will point at the next, not yet queued command. This case triggered the error message Signed-off-by:
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Tyrel Datwyler authored
commit a87eeb90 upstream. Commit 655ee63c ("scsi constants: command, sense key + additional sense string") added a "Completed" sense string with key 0xF to snstext[], but failed to updated the upper bounds check of the sense key in scsi_sense_key_string(). Fixes: 655ee63c ("[SCSI] scsi constants: command, sense key + additional sense strings") Signed-off-by:
Tyrel Datwyler <tyreld@linux.vnet.ibm.com> Reviewed-by:
Bart Van Assche <bart.vanassche@sandisk.com> Signed-off-by:
Martin K. Petersen <martin.petersen@oracle.com> [bwh: Backported to 3.16: adjust context] Signed-off-by:
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Anders Darander authored
commit c2ab4474 upstream. The driver always assumes that an input device has been created when reading channel 3. This causes a kernel panic when dereferencing st->ts_input. The change was introduced in commit 84882b06 ("iio: adc: at91_adc: Add support for touchscreens without TSMR"). Earlier versions only entered that part of the if-else statement if only the following flags are set: AT91_ADC_IER_XRDY | AT91_ADC_IER_YRDY | AT91_ADC_IER_PRDY Signed-off-by:
Anders Darander <anders@chargestorm.se> Acked-by:
Alexandre Belloni <alexandre.belloni@free-electrons.com> Signed-off-by:
Jonathan Cameron <jic23@kernel.org> Signed-off-by:
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Alison Schofield authored
commit f8adf645 upstream. Use the iio_pollfunc_store_time parameter during triggered buffer set-up to get valid timestamps. Signed-off-by:
Alison Schofield <amsfield22@gmail.com> Cc: Daniel Baluta <daniel.baluta@gmail.com> Signed-off-by:
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Gavin Li authored
commit add12505 upstream. This fixes the "BOGUS urb xfer" warning logged by usb_submit_urb(). Signed-off-by:
Gavin Li <git@thegavinli.com> Acked-by:
Oliver Neukum <oneukum@suse.com> Signed-off-by:
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Alexey Khoroshilov authored
commit 3b7c7e52 upstream. There is an allocation with GFP_KERNEL flag in mos7840_write(), while it may be called from interrupt context. Follow-up for commit 19125283 ("USB: kobil_sct: fix non-atomic allocation in write path") Found by Linux Driver Verification project (linuxtesting.org). Signed-off-by:
Alexey Khoroshilov <khoroshilov@ispras.ru> Signed-off-by:
Johan Hovold <johan@kernel.org> Signed-off-by:
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Alexey Khoroshilov authored
commit 5a5a1d61 upstream. There is an allocation with GFP_KERNEL flag in mos7720_write(), while it may be called from interrupt context. Follow-up for commit 19125283 ("USB: kobil_sct: fix non-atomic allocation in write path") Found by Linux Driver Verification project (linuxtesting.org). Signed-off-by:
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Johannes Berg authored
commit c15c0ab1 upstream. Pass the correct type __wsum to csum_sub() and csum_add(). This doesn't really change anything since __wsum really *is* __be32, but removes the address space warnings from sparse. Cc: Eric Dumazet <edumazet@google.com> Fixes: 34ae6a1a ("ipv6: update skb->csum when CE mark is propagated") Signed-off-by:
Johannes Berg <johannes.berg@intel.com> Acked-by:
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Thomas Garnier authored
commit 62822e2e upstream. Restore the processor state before calling any other functions to ensure per-CPU variables can be used with KASLR memory randomization. Tracing functions use per-CPU variables (GS based on x86) and one was called just before restoring the processor state fully. It resulted in a double fault when both the tracing & the exception handler functions tried to use a per-CPU variable. Fixes: bb3632c6 (PM / sleep: trace events for suspend/resume) Reported-and-tested-by:
Borislav Petkov <bp@suse.de> Reported-by:
Jiri Kosina <jikos@kernel.org> Tested-by:
Rafael J. Wysocki <rafael@kernel.org> Tested-by:
Jiri Kosina <jkosina@suse.cz> Signed-off-by:
Thomas Garnier <thgarnie@google.com> Acked-by:
Pavel Machek <pavel@ucw.cz> Signed-off-by:
Rafael J. Wysocki <rafael.j.wysocki@intel.com> Signed-off-by:
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Sven Van Asbroeck authored
commit 5381cfb6 upstream. The device's model download function returns the model data as an array of u32s, which is later compared to the reference model data. However, since the latter is an array of u16s, the comparison does not happen correctly, and model verification fails. This in turn breaks the POR initialization sequence. Fixes: 39e7213e ("max17042_battery: Support regmap to access device's registers") Reported-by:
Dan Carpenter <dan.carpenter@oracle.com> Signed-off-by:
Sven Van Asbroeck <TheSven73@googlemail.com> Reviewed-by:
Krzysztof Kozlowski <k.kozlowski@samsung.com> Signed-off-by:
Sebastian Reichel <sre@kernel.org> Signed-off-by:
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James Hogan authored
commit 9b731bcf upstream. Propagate errors from kvm_mips_handle_kseg0_tlb_fault() and kvm_mips_handle_mapped_seg_tlb_fault(), usually triggering an internal error since they normally indicate the guest accessed bad physical memory or the commpage in an unexpected way. Fixes: 858dd5d4 ("KVM/MIPS32: MMU/TLB operations for the Guest.") Fixes: e685c689 ("KVM/MIPS32: Privileged instruction/target branch emulation.") Signed-off-by:
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James Hogan authored
commit 0741f52d upstream. Two consecutive gfns are loaded into host TLB, so ensure the range check isn't off by one if guest_pmap_npages is odd. Fixes: 858dd5d4 ("KVM/MIPS32: MMU/TLB operations for the Guest.") Signed-off-by:
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James Hogan authored
commit 8985d503 upstream. kvm_mips_handle_mapped_seg_tlb_fault() calculates the guest frame number based on the guest TLB EntryLo values, however it is not range checked to ensure it lies within the guest_pmap. If the physical memory the guest refers to is out of range then dump the guest TLB and emit an internal error. Fixes: 858dd5d4 ("KVM/MIPS32: MMU/TLB operations for the Guest.") Signed-off-by:
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James Hogan authored
commit c604cffa upstream. kvm_mips_handle_mapped_seg_tlb_fault() appears to map the guest page at virtual address 0 to PFN 0 if the guest has created its own mapping there. The intention is unclear, but it may have been an attempt to protect the zero page from being mapped to anything but the comm page in code paths you wouldn't expect from genuine commpage accesses (guest kernel mode cache instructions on that address, hitting trapping instructions when executing from that address with a coincidental TLB eviction during the KVM handling, and guest user mode accesses to that address). Fix this to check for mappings exactly at KVM_GUEST_COMMPAGE_ADDR (it may not be at address 0 since commit 42aa12e7 ("MIPS: KVM: Move commpage so 0x0 is unmapped")), and set the corresponding EntryLo to be interpreted as 0 (invalid). Fixes: 858dd5d4 ("KVM/MIPS32: MMU/TLB operations for the Guest.") Signed-off-by:
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Lu Baolu authored
commit 53958751 upstream. In sg_timeout(), req->status is set to "-ETIMEDOUT" before calling into usb_sg_cancel(). usb_sg_cancel() will do nothing and return directly if req->status has been set to a non-zero value. This will cause driver hang whenever transfer time out is triggered. This patch fixes this issue. It could be backported to stable kernel with version later than v3.15. Cc: Alan Stern <stern@rowland.harvard.edu> Signed-off-by:
Lu Baolu <baolu.lu@linux.intel.com> Suggested-by:
Alan Stern <stern@rowland.harvard.edu> Acked-by:
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Dan Carpenter authored
commit 7442e6db upstream. The udc->eps[] array has USB_MAX_ENDPOINTS elements so > should be >=. Fixes: 3948f0e0 ('usb: add Freescale QE/CPM USB peripheral controller driver') Acked-by:
Peter Chen <peter.chen@nxp.com> Signed-off-by:
Felipe Balbi <felipe.balbi@linux.intel.com> [bwh: Backported to 3.16: adjust filename] Signed-off-by:
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Yinghai Lu authored
commit e7f85168 upstream. Found one megaraid_sas HBA probe fails, [ 187.235190] scsi host2: Avago SAS based MegaRAID driver [ 191.112365] megaraid_sas 0000:89:00.0: BAR 0: can't reserve [io 0x0000-0x00ff] [ 191.120548] megaraid_sas 0000:89:00.0: IO memory region busy! and the card has resource like, [ 125.097714] pci 0000:89:00.0: [1000:005d] type 00 class 0x010400 [ 125.104446] pci 0000:89:00.0: reg 0x10: [io 0x0000-0x00ff] [ 125.110686] pci 0000:89:00.0: reg 0x14: [mem 0xce400000-0xce40ffff 64bit] [ 125.118286] pci 0000:89:00.0: reg 0x1c: [mem 0xce300000-0xce3fffff 64bit] [ 125.125891] pci 0000:89:00.0: reg 0x30: [mem 0xce200000-0xce2fffff pref] that does not io port resource allocated from BIOS, and kernel can not assign one as io port shortage. The driver is only looking for MEM, and should not fail. It turns out megasas_init_fw() etc are using bar index as mask. index 1 is used as mask 1, so that pci_request_selected_regions() is trying to request BAR0 instead of BAR1. Fix all related reference. Fixes: b6d5d880 ("megaraid_sas: Use lowest memory bar for SR-IOV VF support") Signed-off-by:
Yinghai Lu <yinghai@kernel.org> Acked-by:
Kashyap Desai <kashyap.desai@broadcom.com> Signed-off-by:
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Dave Weinstein authored
commit 7de24996 upstream. Add access checks to sys_oabi_epoll_wait() and sys_oabi_semtimedop(). This fixes CVE-2016-3857, a local privilege escalation under CONFIG_OABI_COMPAT. Reported-by:
Chiachih Wu <wuchiachih@gmail.com> Reviewed-by:
Kees Cook <keescook@chromium.org> Reviewed-by:
Nicolas Pitre <nico@linaro.org> Signed-off-by:
Dave Weinstein <olorin@google.com> Signed-off-by:
Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by:
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Daniel Mentz authored
commit 18b43e89 upstream. trace_hardirqs_on_caller() in lockdep.c expects to be called before, not after interrupts are actually enabled. The following comment in kernel/locking/lockdep.c substantiates this claim: " /* * We're enabling irqs and according to our state above irqs weren't * already enabled, yet we find the hardware thinks they are in fact * enabled.. someone messed up their IRQ state tracing. */ " An example can be found in include/linux/irqflags.h: do { trace_hardirqs_on(); raw_local_irq_enable(); } while (0) Without this change, we hit the following DEBUG_LOCKS_WARN_ON. [ 7.760000] ------------[ cut here ]------------ [ 7.760000] WARNING: CPU: 0 PID: 1 at kernel/locking/lockdep.c:2711 resume_user_mode_begin+0x48/0xf0 [ 7.770000] DEBUG_LOCKS_WARN_ON(!irqs_disabled()) [ 7.780000] Modules linked in: [ 7.780000] CPU: 0 PID: 1 Comm: init Not tainted 4.7.0-00003-gc668bb9-dirty #366 [ 7.790000] [ 7.790000] Stack Trace: [ 7.790000] arc_unwind_core.constprop.1+0xa4/0x118 [ 7.800000] warn_slowpath_fmt+0x72/0x158 [ 7.800000] resume_user_mode_begin+0x48/0xf0 [ 7.810000] ---[ end trace 6f6a7a8fae20d2f0 ]--- Signed-off-by:
Daniel Mentz <danielmentz@google.com> Signed-off-by:
Vineet Gupta <vgupta@synopsys.com> [bwh: Backported to 3.16: adjust filename] Signed-off-by:
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Sebastian Andrzej Siewior authored
commit 5cf0791d upstream. There's a subtle preemption race on UP kernels: Usually current->mm (and therefore mm->pgd) stays the same during the lifetime of a task so it does not matter if a task gets preempted during the read and write of the CR3. But then, there is this scenario on x86-UP: TaskA is in do_exit() and exit_mm() sets current->mm = NULL followed by: -> mmput() -> exit_mmap() -> tlb_finish_mmu() -> tlb_flush_mmu() -> tlb_flush_mmu_tlbonly() -> tlb_flush() -> flush_tlb_mm_range() -> __flush_tlb_up() -> __flush_tlb() -> __native_flush_tlb() At this point current->mm is NULL but current->active_mm still points to the "old" mm. Let's preempt taskA _after_ native_read_cr3() by taskB. TaskB has its own mm so CR3 has changed. Now preempt back to taskA. TaskA has no ->mm set so it borrows taskB's mm and so CR3 remains unchanged. Once taskA gets active it continues where it was interrupted and that means it writes its old CR3 value back. Everything is fine because userland won't need its memory anymore. Now the fun part: Let's preempt taskA one more time and get back to taskB. This time switch_mm() won't do a thing because oldmm (->active_mm) is the same as mm (as per context_switch()). So we remain with a bad CR3 / PGD and return to userland. The next thing that happens is handle_mm_fault() with an address for the execution of its code in userland. handle_mm_fault() realizes that it has a PTE with proper rights so it returns doing nothing. But the CPU looks at the wrong PGD and insists that something is wrong and faults again. And again. And one more time… This pagefault circle continues until the scheduler gets tired of it and puts another task on the CPU. It gets little difficult if the task is a RT task with a high priority. The system will either freeze or it gets fixed by the software watchdog thread which usually runs at RT-max prio. But waiting for the watchdog will increase the latency of the RT task which is no good. Fix this by disabling preemption across the critical code section. Signed-off-by:
Sebastian Andrzej Siewior <bigeasy@linutronix.de> Acked-by:
Peter Zijlstra (Intel) <peterz@infradead.org> Acked-by:
Rik van Riel <riel@redhat.com> Acked-by:
Andy Lutomirski <luto@kernel.org> Cc: Borislav Petkov <bp@alien8.de> Cc: Borislav Petkov <bp@suse.de> Cc: Brian Gerst <brgerst@gmail.com> Cc: Denys Vlasenko <dvlasenk@redhat.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Josh Poimboeuf <jpoimboe@redhat.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Mel Gorman <mgorman@suse.de> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: linux-mm@kvack.org Link: http://lkml.kernel.org/r/1470404259-26290-1-git-send-email-bigeasy@linutronix.de [ Prettified the changelog. ] Signed-off-by:
Ingo Molnar <mingo@kernel.org> Signed-off-by:
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Felipe Balbi authored
commit c7de5734 upstream. When using SG lists, we would end up setting request->actual to: num_mapped_sgs * (request->length - count) Let's fix that up by incrementing request->actual only once. Reported-by:
Brian E Rogers <brian.e.rogers@intel.com> Signed-off-by:
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Stefan Haberland authored
commit 9ba333dc upstream. When a device is in a status where CIO has killed all I/O by itself the interrupt for a clear request may not contain an irb to determine the clear function. Instead it contains an error pointer -EIO. This was ignored by the DASD int_handler leading to a hanging device waiting for a clear interrupt. Handle -EIO error pointer correctly for requests that are clear pending and treat the clear as successful. Signed-off-by:
Stefan Haberland <sth@linux.vnet.ibm.com> Reviewed-by:
Sebastian Ott <sebott@linux.vnet.ibm.com> Signed-off-by:
Martin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by:
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Zefan Li authored
commit 06f4e948 upstream. A new task inherits cpus_allowed and mems_allowed masks from its parent, but if someone changes cpuset's config by writing to cpuset.cpus/cpuset.mems before this new task is inserted into the cgroup's task list, the new task won't be updated accordingly. Signed-off-by:
Zefan Li <lizefan@huawei.com> Signed-off-by:
Tejun Heo <tj@kernel.org> [bwh: Backported to 3.16: adjust context] Signed-off-by:
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Alan Stern authored
commit aed9d65a upstream. Erroneous or malicious endpoint descriptors may have non-zero bits in reserved positions, or out-of-bounds values. This patch helps prevent these from causing problems by bounds-checking the wMaxPacketValue entries in endpoint descriptors and capping the values at the maximum allowed. This issue was first discovered and tests were conducted by Jake Lamberson <jake.lamberson1@gmail.com>, an intern working for Rosie Hall. Signed-off-by:
roswest <roswest@cisco.com> Tested-by:
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Russell King authored
commit a0118c8b upstream. Since 6de62f15 ("crypto: algif_hash - Require setkey before accept(2)"), the AF_ALG interface requires userspace to provide a key to any algorithm that has a setkey method. However, the non-HMAC algorithms are not keyed, so setting a key is unnecessary. Fix this by removing the setkey method from the non-keyed hash algorithms. Fixes: 6de62f15 ("crypto: algif_hash - Require setkey before accept(2)") Signed-off-by:
Russell King <rmk+kernel@armlinux.org.uk> Signed-off-by:
Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by:
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Mahesh Salgaonkar authored
commit c74dd88e upstream. When machine check occurs with MSR(RI=0), it means MC interrupt is unrecoverable and kernel goes down to panic path. But the console message still shows it as recovered. This patch fixes the MCE console messages. Fixes: 36df96f8 ("powerpc/book3s: Decode and save machine check event.") Signed-off-by:
Mahesh Salgaonkar <mahesh@linux.vnet.ibm.com> Signed-off-by:
Michael Ellerman <mpe@ellerman.id.au> Signed-off-by:
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Liping Zhang authored
commit 00a3101f upstream. Like NFQNL_MSG_VERDICT_BATCH do, we should also reject the verdict request when the portid is not same with the initial portid(maybe from another process). Fixes: 97d32cf9 ("netfilter: nfnetlink_queue: batch verdict support") Signed-off-by:
Liping Zhang <liping.zhang@spreadtrum.com> Reviewed-by:
Florian Westphal <fw@strlen.de> Signed-off-by:
Pablo Neira Ayuso <pablo@netfilter.org> [bwh: Backported to 3.16: adjust filename] Signed-off-by:
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Liping Zhang authored
commit b173a28f upstream. The 'name' filed in struct nf_conntrack_expect_policy{} is not a pointer, so check it is NULL or not will always return true. Even if the name is empty, slash will always be displayed like follows: # cat /proc/net/nf_conntrack_expect 297 l3proto = 2 proto=6 src=1.1.1.1 dst=2.2.2.2 sport=1 dport=1025 ftp/ ^ Fixes: 3a8fc53a ("netfilter: nf_ct_helper: allocate 16 bytes for the helper and policy names") Signed-off-by:
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Mahesh Salgaonkar authored
commit bc14c491 upstream. The current implementation of MCE early handling modifies CR0/1 registers without saving its old values. Fix this by moving early check for powersaving mode to machine_check_handle_early(). The power architecture 2.06 or later allows the possibility of getting machine check while in nap/sleep/winkle. The last bit of HSPRG0 is set to 1, if thread is woken up from winkle. Hence, clear the last bit of HSPRG0 (r13) before MCE handler starts using it as paca pointer. Also, the current code always puts the thread into nap state irrespective of whatever idle state it woke up from. Fix that by looking at paca->thread_idle_state and put the thread back into same state where it came from. Fixes: 1c51089f ("powerpc/book3s: Return from interrupt if coming from evil context.") Reported-by:
Paul Mackerras <paulus@samba.org> Signed-off-by:
Shreyas B. Prabhu <shreyas@linux.vnet.ibm.com> Signed-off-by:
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