- 25 Feb, 2016 27 commits
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Takashi Iwai authored
commit 2154cc0e upstream. Mac Mini 7,1 model with CS4208 codec reports the headphone jack detection wrongly in an inverted way. Moreover, the advertised pins for the audio input and SPDIF output have actually no jack detection. This patch addresses these issues. The inv_jack_detect flag is set for fixing the headphone jack detection, and the pin configs for audio input and SPDIF output are marked as non-detectable. Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=105161 Report-and-tested-by: moosotc@gmail.com Signed-off-by:
Takashi Iwai <tiwai@suse.de> Signed-off-by:
Luis Henriques <luis.henriques@canonical.com>
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Rusty Russell authored
commit 2e7bac53 upstream. This trivial wrapper adds clarity and makes the following patch smaller. Signed-off-by:
Rusty Russell <rusty@rustcorp.com.au> Signed-off-by:
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Vinod Koul authored
commit 5e82d2be upstream. While performing hw_free, DPCM checks the BE state but leaves out the suspend state. The suspend state needs to be checked as well, as we might be suspended and then usermode closes rather than resuming the audio stream. This was found by a stress testing of system with playback in loop and killed after few seconds running in background and second script running suspend-resume test in loop Signed-off-by:
Vinod Koul <vinod.koul@intel.com> Acked-by:
Liam Girdwood <liam.r.girdwood@linux.intel.com> Signed-off-by:
Mark Brown <broonie@kernel.org> Signed-off-by:
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zengtao authored
commit 0f26922f upstream. The datatype __kernel_time_t is u32 on 32bit platform, so its subject to overflows in the timeval/timespec to cputime conversion. Currently the following functions are affected: 1. setitimer() 2. timer_create/timer_settime() 3. sys_clock_nanosleep This can happen on MIPS32 and ARM32 with "Full dynticks CPU time accounting" enabled, which is required for CONFIG_NO_HZ_FULL. Enforce u64 conversion to prevent the overflow. Fixes: 31c1fc81 ("ARM: Kconfig: allow full nohz CPU accounting") Signed-off-by:
zengtao <prime.zeng@huawei.com> Reviewed-by:
Arnd Bergmann <arnd@arndb.de> Cc: <fweisbec@gmail.com> Link: http://lkml.kernel.org/r/1454384314-154784-1-git-send-email-prime.zeng@huawei.comSigned-off-by:
Thomas Gleixner <tglx@linutronix.de> Signed-off-by:
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James Hogan authored
commit f4dce1ff upstream. Since commit 4c21b8fd ("MIPS: seccomp: Handle indirect system calls (o32)"), syscall_get_arguments() attempts to handle o32 indirect syscall arguments by incrementing both the start argument number and the number of arguments to fetch. However only the start argument number needs to be incremented. The number of arguments does not change, they're just shifted up by one, and in fact the output array is provided by the caller and is likely only n entries long, so reading more arguments overflows the output buffer. In the case of seccomp, this results in it fetching 7 arguments starting at the 2nd one, which overflows the unsigned long args[6] in populate_seccomp_data(). This clobbers the $s0 register from syscall_trace_enter() which __seccomp_phase1_filter() saved onto the stack, into which syscall_trace_enter() had placed its syscall number argument. This caused Chromium to crash. Credit goes to Milko for tracking it down as far as $s0 being clobbered. Fixes: 4c21b8fd ("MIPS: seccomp: Handle indirect system calls (o32)") Reported-by:
Milko Leporis <milko.leporis@imgtec.com> Signed-off-by:
James Hogan <james.hogan@imgtec.com> Cc: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/12213/Signed-off-by:
Ralf Baechle <ralf@linux-mips.org> Signed-off-by:
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Tejun Heo authored
commit 8eee1d3e upstream. The bulk of ATA host state machine is implemented by ata_sff_hsm_move(). The function is called from either the interrupt handler or, if polling, a work item. Unlike from the interrupt path, the polling path calls the function without holding the host lock and ata_sff_hsm_move() selectively grabs the lock. This is completely broken. If an IRQ triggers while polling is in progress, the two can easily race and end up accessing the hardware and updating state machine state at the same time. This can put the state machine in an illegal state and lead to a crash like the following. kernel BUG at drivers/ata/libata-sff.c:1302! invalid opcode: 0000 [#1] SMP DEBUG_PAGEALLOC KASAN Modules linked in: CPU: 1 PID: 10679 Comm: syz-executor Not tainted 4.5.0-rc1+ #300 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011 task: ffff88002bd00000 ti: ffff88002e048000 task.ti: ffff88002e048000 RIP: 0010:[<ffffffff83a83409>] [<ffffffff83a83409>] ata_sff_hsm_move+0x619/0x1c60 ... Call Trace: <IRQ> [<ffffffff83a84c31>] __ata_sff_port_intr+0x1e1/0x3a0 drivers/ata/libata-sff.c:1584 [<ffffffff83a85611>] ata_bmdma_port_intr+0x71/0x400 drivers/ata/libata-sff.c:2877 [< inline >] __ata_sff_interrupt drivers/ata/libata-sff.c:1629 [<ffffffff83a85bf3>] ata_bmdma_interrupt+0x253/0x580 drivers/ata/libata-sff.c:2902 [<ffffffff81479f98>] handle_irq_event_percpu+0x108/0x7e0 kernel/irq/handle.c:157 [<ffffffff8147a717>] handle_irq_event+0xa7/0x140 kernel/irq/handle.c:205 [<ffffffff81484573>] handle_edge_irq+0x1e3/0x8d0 kernel/irq/chip.c:623 [< inline >] generic_handle_irq_desc include/linux/irqdesc.h:146 [<ffffffff811a92bc>] handle_irq+0x10c/0x2a0 arch/x86/kernel/irq_64.c:78 [<ffffffff811a7e4d>] do_IRQ+0x7d/0x1a0 arch/x86/kernel/irq.c:240 [<ffffffff86653d4c>] common_interrupt+0x8c/0x8c arch/x86/entry/entry_64.S:520 <EOI> [< inline >] rcu_lock_acquire include/linux/rcupdate.h:490 [< inline >] rcu_read_lock include/linux/rcupdate.h:874 [<ffffffff8164b4a1>] filemap_map_pages+0x131/0xba0 mm/filemap.c:2145 [< inline >] do_fault_around mm/memory.c:2943 [< inline >] do_read_fault mm/memory.c:2962 [< inline >] do_fault mm/memory.c:3133 [< inline >] handle_pte_fault mm/memory.c:3308 [< inline >] __handle_mm_fault mm/memory.c:3418 [<ffffffff816efb16>] handle_mm_fault+0x2516/0x49a0 mm/memory.c:3447 [<ffffffff8127dc16>] __do_page_fault+0x376/0x960 arch/x86/mm/fault.c:1238 [<ffffffff8127e358>] trace_do_page_fault+0xe8/0x420 arch/x86/mm/fault.c:1331 [<ffffffff8126f514>] do_async_page_fault+0x14/0xd0 arch/x86/kernel/kvm.c:264 [<ffffffff86655578>] async_page_fault+0x28/0x30 arch/x86/entry/entry_64.S:986 Fix it by ensuring that the polling path is holding the host lock before entering ata_sff_hsm_move() so that all hardware accesses and state updates are performed under the host lock. Signed-off-by:
Tejun Heo <tj@kernel.org> Reported-and-tested-by:
Dmitry Vyukov <dvyukov@google.com> Link: http://lkml.kernel.org/g/CACT4Y+b_JsOxJu2EZyEf+mOXORc_zid5V1-pLZSroJVxyWdSpw@mail.gmail.comSigned-off-by:
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Takashi Iwai authored
commit f784beb7 upstream. Although ALSA timer code got hardening for races, it still causes use-after-free error. This is however rather a corrupted linked list, not actually the concurrent accesses. Namely, when timer start is triggered twice, list_add_tail() is called twice, too. This ends up with the link corruption and triggers KASAN error. The simplest fix would be replacing list_add_tail() with list_move_tail(), but fundamentally it's the problem that we don't check the double start/stop correctly. So, the right fix here is to add the proper checks to snd_timer_start() and snd_timer_stop() (and their variants). BugLink: http://lkml.kernel.org/r/CACT4Y+ZyPRoMQjmawbvmCEDrkBD2BQuH7R09=eOkf5ESK8kJAw@mail.gmail.comReported-by:
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Takashi Iwai authored
commit c3b16813 upstream. This is a minor code cleanup without any functional changes: - Kill keep_flag argument from _snd_timer_stop(), as all callers pass only it false. - Remove redundant NULL check in _snd_timer_stop(). Signed-off-by:
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Takashi Iwai authored
commit 2cdc7b63 upstream. ALSA sequencer may open/close and control ALSA timer instance dynamically either via sequencer events or direct ioctls. These are done mostly asynchronously, and it may call still some timer action like snd_timer_start() while another is calling snd_timer_close(). Since the instance gets removed by snd_timer_close(), it may lead to a use-after-free. This patch tries to address such a race by protecting each snd_timer_*() call via the existing spinlock and also by avoiding the access to timer during close call. BugLink: http://lkml.kernel.org/r/CACT4Y+Z6RzW5MBr-HUdV-8zwg71WQfKTdPpYGvOeS7v4cyurNQ@mail.gmail.comReported-by:
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Takashi Iwai authored
commit b2483716 upstream. There are potential deadlocks in PCM OSS emulation code while accessing read/write and mmap concurrently. This comes from the infamous mmap_sem usage in copy_from/to_user(). Namely, snd_pcm_oss_write() -> &runtime->oss.params_lock -> copy_to_user() -> &mm->mmap_sem mmap() -> &mm->mmap_sem -> snd_pcm_oss_mmap() -> &runtime->oss.params_lock Since we can't avoid taking params_lock from mmap code path, use trylock variant and aborts with -EAGAIN as a workaround of this AB/BA deadlock. BugLink: http://lkml.kernel.org/r/CACT4Y+bVrBKDG0G2_AcUgUQa+X91VKTeS4v+wN7BSHwHtqn3kQ@mail.gmail.comReported-by:
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Takashi Iwai authored
commit cc85f7a6 upstream. NULL user-space buffer can be passed even in a normal path, thus it's not good to spew a kernel warning with stack trace at each time. Just drop snd_BUG_ON() macro usage there. BugLink: http://lkml.kernel.org/r/CACT4Y+YfVJ3L+q0i-4vyQVyyPD7V=OMX0PWPi29x9Bo3QaBLdw@mail.gmail.comReported-by:
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Takashi Iwai authored
commit 2d1b5c08 upstream. The virmidi driver has an open race at closing its assigned rawmidi device, and this may lead to use-after-free in snd_seq_deliver_single_event(). Plug the hole by properly protecting the linked list deletion and calling in the right order in snd_virmidi_input_close(). BugLink: http://lkml.kernel.org/r/CACT4Y+Zd66+w12fNN85-425cVQT=K23kWbhnCEcMB8s3us-Frw@mail.gmail.comReported-by:
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Dan Carpenter authored
commit b1d353ad upstream. "count" is controlled by the user and it can be negative. Let's prevent that by making it unsigned. You have to have CAP_SYS_RAWIO to call this function so the bug is not as serious as it could be. Fixes: 5369c02d ('intel_scu_ipc: Utility driver for intel scu ipc') Signed-off-by:
Dan Carpenter <dan.carpenter@oracle.com> Signed-off-by:
Darren Hart <dvhart@linux.intel.com> Signed-off-by:
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Akinobu Mita authored
commit 431386e7 upstream. According to the datasheet, the resolusion of temperature sensor is -5.35 counts/C. Temperature ADC is 472 counts at 25C. (https://www.sparkfun.com/datasheets/Sensors/Pressure/MPL115A1.pdf NOTE: This is older revision, but this information is removed from the latest datasheet from nxp somehow) Temp [C] = (Tadc - 472) / -5.35 + 25 = (Tadc - 605.750000) * -0.186915888 So the correct offset is -605.750000. Signed-off-by:
Akinobu Mita <akinobu.mita@gmail.com> Acked-by:
Peter Meerwald-Stadler <pmeerw@pmeerw.net> Signed-off-by:
Jonathan Cameron <jic23@kernel.org> Signed-off-by:
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Dan Carpenter authored
commit d81dac3c upstream. In twl4030_bci_probe() there are some failure paths where we call iio_channel_release() with a NULL pointer. (Apparently, that driver can opperate without a valid channel pointer). Let's fix it by adding a NULL check in iio_channel_release(). Fixes: 2202e1fc ('drivers: power: twl4030_charger: fix link problems when building as module') Signed-off-by:
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Wang, Rui Y authored
commit fe097861 upstream. hash_sendmsg/sendpage() need to wait for the completion of crypto_ahash_init() otherwise it can cause panic. Signed-off-by:
Rui Wang <rui.y.wang@intel.com> Signed-off-by:
Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by:
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Mike Christie authored
commit 8a9ebe71 upstream. In a couple places we are not converting to/from the Linux block layer 512 bytes sectors. 1. The request queue values and what we do are a mismatch of things: max_discard_sectors - This is in linux block layer 512 byte sectors. We are just copying this to max_unmap_lba_count. discard_granularity - This is in bytes. We are converting it to Linux block layer 512 byte sectors. discard_alignment - This is in bytes. We are just copying this over. The problem is that the core LIO code exports these values in spc_emulate_evpd_b0 and we use them to test request arguments in sbc_execute_unmap, but we never convert to the block size we export to the initiator. If we are not using 512 byte sectors then we are exporting the wrong values or are checks are off. And, for the discard_alignment/bytes case we are just plain messed up. 2. blkdev_issue_discard's start and number of sector arguments are supposed to be in linux block layer 512 byte sectors. We are currently passing in the values we get from the initiator which might be based on some other sector size. There is a similar problem in iblock_execute_write_same where the bio functions want values in 512 byte sectors but we are passing in what we got from the initiator. Signed-off-by:
Mike Christie <mchristi@redhat.com> Signed-off-by:
Nicholas Bellinger <nab@linux-iscsi.org> [ luis: backported to 3.16: - dropped changes to attribute unmap_zeroes_data as 3.16 doesn't support LBPRZ - functions rename: * fd_execute_unmap -> fd_do_unmap * iblock_execute_unmap -> iblock_do_unmap - adjusted context ] Signed-off-by:
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Jani Nikula authored
commit 5efd4076 upstream. Per DP spec, the source device should fall back to 18 bpp, VESA range RGB when the sink capability is unknown. Fix the color depth clamping. 18 bpp color depth should ensure full color range in automatic mode. The clamping has been HDMI specific since its introduction in commit 996a2239 Author: Daniel Vetter <daniel.vetter@ffwll.ch> Date: Fri Apr 19 11:24:34 2013 +0200 drm/i915: Disable high-bpc on pre-1.4 EDID screens Reported-and-tested-by:
Dihan Wickremasuriya <nayomal@gmail.com> Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=105331Reviewed-by:
Ville Syrjälä <ville.syrjala@linux.intel.com> Signed-off-by:
Jani Nikula <jani.nikula@intel.com> Link: http://patchwork.freedesktop.org/patch/msgid/1452695720-7076-1-git-send-email-jani.nikula@intel.com (cherry picked from commit 013dd9e0) Signed-off-by:
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Herbert Xu authored
commit 00420a65 upstream. The has_key logic is wrong for shash algorithms as they always have a setkey function. So we should instead be testing against shash_no_setkey. Fixes: a5596d63 ("crypto: hash - Add crypto_ahash_has_setkey") Reported-by:
Stephan Mueller <smueller@chronox.de> Signed-off-by:
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Johannes Berg authored
commit 6736fde9 upstream. The code within wait_event_interruptible() is called with !TASK_RUNNING, so mustn't call any functions that can sleep, like mutex_lock(). Since we re-check the list_empty() in a loop after the wait, it's safe to simply use list_empty() without locking. This bug has existed forever, but was only discovered now because all userspace implementations, including the default 'rfkill' tool, use poll() or select() to get a readable fd before attempting to read. Fixes: c64fb016 ("rfkill: create useful userspace interface") Reported-by:
Johannes Berg <johannes.berg@intel.com> Signed-off-by:
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Sachin Kulkarni authored
commit 4fa11ec7 upstream. During a sw scan ieee80211_iface_work ignores work items for all vifs. However after the scan complete work is requeued only for STA, ADHOC and MESH iftypes. This occasionally results in event processing getting delayed/not processed for iftype AP when it coexists with a STA. This can result in data halt and eventually disconnection on the AP interface. Signed-off-by:
Sachin Kulkarni <Sachin.Kulkarni@imgtec.com> Signed-off-by:
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Tejun Heo authored
commit 566d1827 upstream. Some early controllers incorrectly reported zero ports in PORTS_IMPL register and the ahci driver fabricates PORTS_IMPL from the number of ports in those cases. This hasn't mattered but with the new nvme controllers there are cases where zero PORTS_IMPL is valid and should be honored. Disable the workaround for >= AHCI 1.3. Signed-off-by:
Andy Lutomirski <luto@amacapital.net> Link: http://lkml.kernel.org/g/CALCETrU7yMvXEDhjAUShoHEhDwifJGapdw--BKxsP0jmjKGmRw@mail.gmail.com Cc: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com> Signed-off-by:
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Sebastian Andrzej Siewior authored
commit 4ae2182b upstream. A Root Port's AER structure (rpc) contains a queue of events. aer_irq() enqueues AER status information and schedules aer_isr() to dequeue and process it. When we remove a device, aer_remove() waits for the queue to be empty, then frees the rpc struct. But aer_isr() references the rpc struct after dequeueing and possibly emptying the queue, which can cause a use-after-free error as in the following scenario with two threads, aer_isr() on the left and a concurrent aer_remove() on the right: Thread A Thread B -------- -------- aer_irq(): rpc->prod_idx++ aer_remove(): wait_event(rpc->prod_idx == rpc->cons_idx) # now blocked until queue becomes empty aer_isr(): # ... rpc->cons_idx++ # unblocked because queue is now empty ... kfree(rpc) mutex_unlock(&rpc->rpc_mutex) To prevent this problem, use flush_work() to wait until the last scheduled instance of aer_isr() has completed before freeing the rpc struct in aer_remove(). I reproduced this use-after-free by flashing a device FPGA and re-enumerating the bus to find the new device. With SLUB debug, this crashes with 0x6b bytes (POISON_FREE, the use-after-free magic number) in GPR25: pcieport 0000:00:00.0: AER: Multiple Corrected error received: id=0000 Unable to handle kernel paging request for data at address 0x27ef9e3e Workqueue: events aer_isr GPR24: dd6aa000 6b6b6b6b 605f8378 605f8360 d99b12c0 604fc674 606b1704 d99b12c0 NIP [602f5328] pci_walk_bus+0xd4/0x104 [bhelgaas: changelog, stable tag] Signed-off-by:
Sebastian Andrzej Siewior <bigeasy@linutronix.de> Signed-off-by:
Bjorn Helgaas <bhelgaas@google.com> Signed-off-by:
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Tejun Heo authored
commit aa226ff4 upstream. There are three subsystem callbacks in css shutdown path - css_offline(), css_released() and css_free(). Except for css_released(), cgroup core didn't guarantee the order of invocation. css_offline() or css_free() could be called on a parent css before its children. This behavior is unexpected and led to bugs in cpu and memory controller. This patch updates offline path so that a parent css is never offlined before its children. Each css keeps online_cnt which reaches zero iff itself and all its children are offline and offline_css() is invoked only after online_cnt reaches zero. This fixes the memory controller bug and allows the fix for cpu controller. Signed-off-by:
Christian Borntraeger <borntraeger@de.ibm.com> Reported-by:
Brian Christiansen <brian.o.christiansen@gmail.com> Link: http://lkml.kernel.org/g/5698A023.9070703@de.ibm.com Link: http://lkml.kernel.org/g/CAKB58ikDkzc8REt31WBkD99+hxNzjK4+FBmhkgS+NVrC9vjMSg@mail.gmail.com Cc: Heiko Carstens <heiko.carstens@de.ibm.com> Cc: Peter Zijlstra <peterz@infradead.org> [ luis: backported to 3.16: - file rename: cgroup-defs.h -> cgroup.h - adjusted context ] Signed-off-by:
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Bard Liao authored
commit b28785fa upstream. The shift bit of IN1 boost gain control is 12. Signed-off-by:
Bard Liao <bardliao@realtek.com> Signed-off-by:
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Yong Li authored
commit 97a249e9 upstream. Without this change, the name entity for mcp4725 is missing in /sys/bus/iio/devices/iio\:device*/name With this change, name is reported correctly Signed-off-by:
Yong Li <sdliyong@gmail.com> Signed-off-by:
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Vegard Nossum authored
commit 005ce071 upstream. Ran into this on UML: drivers/built-in.o: In function `vf610_adc_probe': drivers/iio/adc/vf610_adc.c:744: undefined reference to `devm_ioremap_resource' devm_ioremap_resource() is defined only when HAS_IOMEM is selected. Signed-off-by:
Vegard Nossum <vegard.nossum@oracle.com> Signed-off-by:
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- 24 Feb, 2016 12 commits
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Herbert Xu authored
commit 1822793a upstream. We need to lock the child socket in skcipher_check_key as otherwise two simultaneous calls can cause the parent socket to be freed. Signed-off-by:
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Herbert Xu authored
commit ad46d7e3 upstream. We need to lock the child socket in hash_check_key as otherwise two simultaneous calls can cause the parent socket to be freed. Signed-off-by:
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Herbert Xu authored
commit d7b65aee upstream. This patch removes the custom release parent function as the generic af_alg_release_parent now works for nokey sockets too. Signed-off-by:
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Herbert Xu authored
commit f1d84af1 upstream. This patch removes the custom release parent function as the generic af_alg_release_parent now works for nokey sockets too. Signed-off-by:
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Herbert Xu authored
commit 6e8d8ecf upstream. This patch adds an exception to the key check so that cipher_null users may continue to use algif_skcipher without setting a key. Signed-off-by:
Ben Hutchings <ben@decadent.org.uk> Signed-off-by:
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Herbert Xu authored
commit a1383cd8 upstream. This patch adds a way for skcipher users to determine whether a key is required by a transform. Signed-off-by:
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Herbert Xu authored
commit 6de62f15 upstream. Hash implementations that require a key may crash if you use them without setting a key. This patch adds the necessary checks so that if you do attempt to use them without a key that we return -ENOKEY instead of proceeding. This patch also adds a compatibility path to support old applications that do acept(2) before setkey. Signed-off-by:
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Herbert Xu authored
commit a0fa2d03 upstream. This patch adds a compatibility path to support old applications that do acept(2) before setkey. Signed-off-by:
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Herbert Xu authored
commit dd504589 upstream. Some cipher implementations will crash if you try to use them without calling setkey first. This patch adds a check so that the accept(2) call will fail with -ENOKEY if setkey hasn't been done on the socket yet. Reported-by:
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Eric W. Biederman authored
commit da362b09 upstream. Andrew Vagin <avagin@parallels.com> writes: > #define _GNU_SOURCE > #include <sys/types.h> > #include <sys/stat.h> > #include <fcntl.h> > #include <sched.h> > #include <unistd.h> > #include <sys/mount.h> > > int main(int argc, char **argv) > { > int fd; > > fd = open("/proc/self/ns/mnt", O_RDONLY); > if (fd < 0) > return 1; > while (1) { > if (umount2("/", MNT_DETACH) || > setns(fd, CLONE_NEWNS)) > break; > } > > return 0; > } > > root@ubuntu:/home/avagin# gcc -Wall nsenter.c -o nsenter > root@ubuntu:/home/avagin# strace ./nsenter > execve("./nsenter", ["./nsenter"], [/* 22 vars */]) = 0 > ... > open("/proc/self/ns/mnt", O_RDONLY) = 3 > umount("/", MNT_DETACH) = 0 > setns(3, 131072) = 0 > umount("/", MNT_DETACH > causes: > [ 260.548301] ------------[ cut here ]------------ > [ 260.550941] kernel BUG at /build/buildd/linux-3.13.0/fs/pnode.c:372! > [ 260.552068] invalid opcode: 0000 [#1] SMP > [ 260.552068] Modules linked in: xt_CHECKSUM iptable_mangle xt_tcpudp xt_addrtype xt_conntrack ipt_MASQUERADE iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 nf_nat nf_conntrack bridge stp llc dm_thin_pool dm_persistent_data dm_bufio dm_bio_prison iptable_filter ip_tables x_tables crct10dif_pclmul crc32_pclmul ghash_clmulni_intel binfmt_misc nfsd auth_rpcgss nfs_acl aesni_intel nfs lockd aes_x86_64 sunrpc fscache lrw gf128mul glue_helper ablk_helper cryptd serio_raw ppdev parport_pc lp parport btrfs xor raid6_pq libcrc32c psmouse floppy > [ 260.552068] CPU: 0 PID: 1723 Comm: nsenter Not tainted 3.13.0-30-generic #55-Ubuntu > [ 260.552068] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 > [ 260.552068] task: ffff8800376097f0 ti: ffff880074824000 task.ti: ffff880074824000 > [ 260.552068] RIP: 0010:[<ffffffff811e9483>] [<ffffffff811e9483>] propagate_umount+0x123/0x130 > [ 260.552068] RSP: 0018:ffff880074825e98 EFLAGS: 00010246 > [ 260.552068] RAX: ffff88007c741140 RBX: 0000000000000002 RCX: ffff88007c741190 > [ 260.552068] RDX: ffff88007c741190 RSI: ffff880074825ec0 RDI: ffff880074825ec0 > [ 260.552068] RBP: ffff880074825eb0 R08: 00000000000172e0 R09: ffff88007fc172e0 > [ 260.552068] R10: ffffffff811cc642 R11: ffffea0001d59000 R12: ffff88007c741140 > [ 260.552068] R13: ffff88007c741140 R14: ffff88007c741140 R15: 0000000000000000 > [ 260.552068] FS: 00007fd5c7e41740(0000) GS:ffff88007fc00000(0000) knlGS:0000000000000000 > [ 260.552068] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > [ 260.552068] CR2: 00007fd5c7968050 CR3: 0000000070124000 CR4: 00000000000406f0 > [ 260.552068] Stack: > [ 260.552068] 0000000000000002 0000000000000002 ffff88007c631000 ffff880074825ed8 > [ 260.552068] ffffffff811dcfac ffff88007c741140 0000000000000002 ffff88007c741160 > [ 260.552068] ffff880074825f38 ffffffff811dd12b ffffffff811cc642 0000000075640000 > [ 260.552068] Call Trace: > [ 260.552068] [<ffffffff811dcfac>] umount_tree+0x20c/0x260 > [ 260.552068] [<ffffffff811dd12b>] do_umount+0x12b/0x300 > [ 260.552068] [<ffffffff811cc642>] ? final_putname+0x22/0x50 > [ 260.552068] [<ffffffff811cc849>] ? putname+0x29/0x40 > [ 260.552068] [<ffffffff811dd88c>] SyS_umount+0xdc/0x100 > [ 260.552068] [<ffffffff8172aeff>] tracesys+0xe1/0xe6 > [ 260.552068] Code: 89 50 08 48 8b 50 08 48 89 02 49 89 45 08 e9 72 ff ff ff 0f 1f 44 00 00 4c 89 e6 4c 89 e7 e8 f5 f6 ff ff 48 89 c3 e9 39 ff ff ff <0f> 0b 66 2e 0f 1f 84 00 00 00 00 00 90 66 66 66 66 90 55 b8 01 > [ 260.552068] RIP [<ffffffff811e9483>] propagate_umount+0x123/0x130 > [ 260.552068] RSP <ffff880074825e98> > [ 260.611451] ---[ end trace 11c33d85f1d4c652 ]-- Which in practice is totally uninteresting. Only the global root user can do it, and it is just a stupid thing to do. However that is no excuse to allow a silly way to oops the kernel. We can avoid this silly problem by setting MNT_LOCKED on the rootfs mount point and thus avoid needing any special cases in the unmount code. Signed-off-by:
"Eric W. Biederman" <ebiederm@xmission.com> Cc: Joseph Salisbury <joseph.salisbury@canonical.com> Signed-off-by:
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Tejun Heo authored
commit 041bd12e upstream. This reverts commit 874bbfe6. Workqueue used to implicity guarantee that work items queued without explicit CPU specified are put on the local CPU. Recent changes in timer broke the guarantee and led to vmstat breakage which was fixed by 176bed1d ("vmstat: explicitly schedule per-cpu work on the CPU we need it to run on"). vmstat is the most likely to expose the issue and it's quite possible that there are other similar problems which are a lot more difficult to trigger. As a preventive measure, 874bbfe6 ("workqueue: make sure delayed work run in local cpu") was applied to restore the local CPU guarnatee. Unfortunately, the change exposed a bug in timer code which got fixed by 22b886dd ("timers: Use proper base migration in add_timer_on()"). Due to code restructuring, the commit couldn't be backported beyond certain point and stable kernels which only had 874bbfe6 started crashing. The local CPU guarantee was accidental more than anything else and we want to get rid of it anyway. As, with the vmstat case fixed, 874bbfe6 is causing more problems than it's fixing, it has been decided to take the chance and officially break the guarantee by reverting the commit. A debug feature will be added to force foreign CPU assignment to expose cases relying on the guarantee and fixes for the individual cases will be backported to stable as necessary. Signed-off-by:
Kamal Mostafa <kamal@canonical.com> Signed-off-by:
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Linus Torvalds authored
commit 176bed1d upstream. The vmstat code uses "schedule_delayed_work_on()" to do the initial startup of the delayed work on the right CPU, but then once it was started it would use the non-cpu-specific "schedule_delayed_work()" to re-schedule it on that CPU. That just happened to schedule it on the same CPU historically (well, in almost all situations), but the code _requires_ this work to be per-cpu, and should say so explicitly rather than depend on the non-cpu-specific scheduling to schedule on the current CPU. The timer code is being changed to not be as single-minded in always running things on the calling CPU. See also commit 874bbfe6 ("workqueue: make sure delayed work run in local cpu") that for now maintains the local CPU guarantees just in case there are other broken users that depended on the accidental behavior. js: 3.12 backport Cc: Christoph Lameter <cl@linux.com> Cc: Tejun Heo <tj@kernel.org> Cc: Mike Galbraith <mgalbraith@suse.com> Cc: Michal Hocko <mhocko@suse.com> Signed-off-by:
Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by:
Jiri Slaby <jslaby@suse.cz> [ kamal: backport to 3.16-stable: use queue_delayed_work_on() ] Signed-off-by:
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- 17 Feb, 2016 1 commit
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Madhavan Srinivasan authored
commit 370f06c8 upstream. Commit 7a786832 ("powerpc/perf: Add an explict flag indicating presence of SLOT field") introduced the PPMU_HAS_SSLOT flag to remove the assumption that MMCRA[SLOT] was present when PPMU_ALT_SIPR was not set. That commit's changelog also mentions that Power8 does not support MMCRA[SLOT]. However when the Power8 PMU support was merged, it errnoeously included the PPMU_HAS_SSLOT flag. So remove PPMU_HAS_SSLOT from the Power8 flags. mpe: On systems where MMCRA[SLOT] exists, the field occupies bits 37:39 (IBM numbering). On Power8 bit 37 is reserved, and 38:39 overlap with the high bits of the Threshold Event Counter Mantissa. I am not aware of any published events which use the threshold counting mechanism, which would cause the mantissa bits to be set. So in practice this bug is unlikely to trigger. Fixes: e05b9b9e ("powerpc/perf: Power8 PMU support") Signed-off-by:
Madhavan Srinivasan <maddy@linux.vnet.ibm.com> Signed-off-by:
Michael Ellerman <mpe@ellerman.id.au> Signed-off-by:
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